JPH10262009A - Optical power measuring device and optical power measuring method - Google Patents

Abstract

(57) [Problem] To provide an optical power measuring device for measuring optical power of an optical burst signal with high accuracy. SOLUTION: A photodiode PD converts a light burst signal into an electric signal. The peak detector 11 detects a peak value of the electric signal. The limiter amplifier 12 amplifies the peak value to a certain amplitude. The conversion value calculator 13 calculates a conversion value from the burst period and the burst length. Amplifier 21 amplifies the electric signal and outputs an amplified signal. The range switching unit 22 switches the gain of the amplifier 21 to an appropriate range. The integrator 23 calculates an average value from the amplified signal. The optical power calculator 24 calculates the optical power by adding the converted value to the average value. The display control unit 30 displays the optical power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical power measuring apparatus and an optical power measuring method, and more particularly to an optical power measuring apparatus for measuring the optical power of an optical burst signal and an optical power measuring method for measuring the optical power of an optical burst signal. .

[0002]

2. Description of the Related Art In recent years, diversification of communication services has accelerated.
Demand for video-on-demand, CATV, high-speed computer communication, etc. is increasing. In order to provide such a large-capacity communication service at a low fee, an optical communication system in which a subscriber communication network is optical is indispensable.

[0003] As an optical communication system, a PDS (Passive) capable of transmitting bidirectional burst transmission over one optical fiber.
Double Star) systems are attracting attention, and FTTH (Fiber To The Home), where optical fibers are laid to each home
Development is progressing toward realizing the system.

[0004] In order to realize such an FTTH system, it is important to measure optical transmission characteristics such as optical power and optical loss in order to ensure reliability and quality. Is widely used.

FIG. 19 is a block diagram of a conventional optical power measuring apparatus 100 compatible with an optical burst signal. Photodiode P
D converts the optical burst signal from the optical fiber into an electric signal. Amplifier 101 amplifies this electric signal. The integrator 102 integrates the amplified electric signal to obtain an average value.

[0006] The A / D converter 103 performs A / D conversion of the average value to obtain a digital value. The display unit 104 displays this digital value as optical power. Range switching unit 10
Reference numeral 5 denotes an amplifier 10 so that the electric signal optically / electrically converted based on the average value falls within the linear operation range of the amplifier 101.
A gain of 1 is controlled to set an appropriate range.

With such a configuration, the optical power measuring device 1
00 measures the optical power of the optical burst signal.

[0008]

However, since the conventional optical power measuring apparatus 100 described above has a burst-like input, it also integrates during a period in which no optical signal is input. It becomes smaller than the actual value.

FIG. 20 is a diagram showing an average value obtained by the conventional optical power measuring device 100. If the mark rate is 1/2 for the optical burst signal as shown in the figure, the value at which the amplitude becomes 1/2 becomes the correct average value A. However, in the conventional optical power measuring apparatus 100, an average value B lower than the average value A is detected because averaging is performed including a portion where there is no signal input (a portion obtained by removing the burst length from the burst period).

As described above, in the conventional apparatus, since the average value smaller than the actual correct value is detected, there is a problem that the correct average value must be obtained by adding the conversion value C to the average value B. .

On the other hand, the range switching unit 105 detects the amplitude of the input optical burst signal to some extent, and then switches the range in accordance with the amplitude. In this case, too, the range is switched based on the average value.

FIG. 21 is a diagram showing a range obtained by the conventional optical power measuring device 100. Since the correct average value is the average value A for the optical burst signal having the mark ratio of １ ／, the assigned range should be range 2.

However, in the case of an optical burst signal having a particularly short burst length as shown in the figure, an average value B which is much smaller than the actual correct average value A is detected. Therefore, the range may be assigned to range 2 instead of range 1.

As described above, in the conventional apparatus, when an optical burst signal having a particularly short burst length is set to a range lower than the actual input, the peak value of the input exceeds the linear operation range of the amplifier 101. As a result, it is not possible to accurately detect the range, and the range must be manually switched, which requires a long time for the operation.

The present invention has been made in view of the above points, and has as its object to provide an optical power measuring apparatus for measuring the optical power of an optical burst signal with high accuracy. Another object of the present invention is to provide an optical power measuring method for measuring optical power of an optical burst signal with high accuracy.

[0016]

FIG. 1 is a principle diagram of an optical power measuring apparatus 1 for achieving the above object. The optical power measuring device 1 according to the present invention includes a photodiode PD, a converted value calculation control unit 10, an optical power detection control unit 20, and a display control unit 3.
0, and measures and displays the optical power of the optical burst signal.

The photodiode PD converts an optical burst signal into an electric signal. The peak detector 11 detects a peak value of the electric signal. The limiter amplifier 12 amplifies the peak value to a constant amplitude value. The conversion value calculator 13 averages the constant amplitude value, detects the burst length of the optical burst signal within the burst period, and calculates the conversion value C from the burst period and the burst length.

The amplifier 21 amplifies the electric signal and outputs an amplified signal. The range switching unit 22 controls the gain of the amplifier 21 to an appropriate range based on the peak value so that the electric signal falls within the linear operation range of the amplifier 21. Integrator 2
3 integrates the amplified signal and outputs an average value of the amplified signal. The optical power calculator 24 calculates the optical power by adding the conversion value C to the average value.

The display control unit 30 A / D converts the optical power into a digital value, and displays the digital value. Here, the electric signal converted from the optical burst signal by the photodiode PD is transmitted to the conversion value calculation control unit 10 and the optical power detection control unit 20. The conversion value calculation control unit 10 calculates a conversion value for converting the average value of the electric signal obtained by the optical power detection control unit 20. The optical power detection control unit 20 adds this conversion value to the average value of the obtained electric signal to obtain an actually correct average value, and calculates it as optical power. The display control unit 30 displays the optical power.

FIG. 18 is a flowchart showing a processing procedure of an optical power measuring method for achieving the above object. The optical power measurement method according to the present invention converts an optical burst signal into an electric signal, detects a peak value of the electric signal, amplifies the peak value to a constant amplitude value, averages the constant amplitude value, and averages the constant amplitude value within a burst period. The burst length of the optical burst signal is detected, and a conversion value is calculated from the burst period and the burst length.

Then, the electric signal is amplified to generate an amplified signal, and the amplified signal is integrated to calculate an average value of the amplified signal.
The optical power is calculated by adding the converted value to the average value, and the optical power is calculated as A
/ D conversion and conversion into a digital value to display the digital value.

Here, when amplifying the electric signal to generate an amplified signal, the gain is controlled to an appropriate range based on the peak value and amplified.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a principle diagram of the optical power measuring apparatus 1 according to the first embodiment. The optical power measuring device 1 includes a photodiode PD, a converted value calculation control unit 10, an optical power detection control unit 20, and a display control unit 30, and measures and displays the optical power of an optical burst signal.

The photodiode PD converts a light burst signal into an electric signal. The peak detector 11 detects a peak value of the electric signal. The limiter amplifier 12 amplifies the peak value to a constant amplitude value. The conversion value calculator 13 averages this constant amplitude value, detects the burst length of the optical burst signal within the burst period, and calculates the conversion value C from the burst period and the burst length. The equation for calculating the converted value C is expressed as in equation (1), where L is the burst length and T is the burst period.

[0025]

## EQU1 ## C = −10 × Log (L / T) [dB] (1) The amplifier 21 amplifies the electric signal and outputs an amplified signal. The range switching unit 22 controls the amplifier 21 so that the electric signal falls within the linear operation range of the amplifier 21 based on the peak value.
Is controlled to an appropriate range. The integrator 23 integrates the amplified signal and outputs an average value of the amplified signal. The optical power calculator 24 calculates the optical power by adding the conversion value C to the average value.

The display control unit 30 A / D converts the optical power into a digital value, and displays the digital value. Next, the overall operation will be described. FIG. 2 shows an optical power measuring device 1
6 is a flowchart showing the overall operation procedure of the first embodiment. [S1] The photodiode PD converts a light burst signal into an electric signal. [S2] The conversion value calculation control unit 10 controls the optical power detection control unit 2
A conversion value for converting the average value of the electric signal obtained at 0 is calculated. [S3] The optical power detection control unit 20 obtains an average value of the electric signal, adds the converted value C to the average value, obtains an actually correct average value, and calculates it as optical power. [S4] The display control unit 30 displays the optical power.

Next, the operation of the conversion value calculation control unit 10 will be described. FIG. 3 is a flowchart illustrating an operation procedure of the conversion value calculation control unit 10 of the optical power measurement device 1. [S10] The peak detector 11 detects a peak value of the electric signal. That is, when an electric signal exists, each peak value is detected, and when there is no electric signal, the signal level is set to L. [S11] The limiter amplifier 12 amplifies each peak value detected by the peak detector 11 to a certain amplitude value. By providing the limiter amplifier 12, the same amplitude value can be set for all optical burst signals other than a continuous signal in which signals of the same amplitude continue. [S12] The conversion value calculator 13 detects the burst length within the burst period by averaging the signal whose amplitude value is first constant. For example, if the averaged value is 0.5, it is understood that a signal is received only for a half period in the burst cycle.
If the averaged value is 0.2, 1 in the burst cycle
It can be seen that the signal is coming only during the period of / 5. As described above, the burst length is detected, the ratio L / T of the burst period to the burst length is obtained, and the conversion value is calculated by the above-described equation (1).

Next, the operation of the optical power detection control unit 20 will be described. FIG. 4 is a flowchart illustrating an operation procedure of the optical power detection control unit 20 of the optical power measurement device 1. [S20] The range switching unit 22 controls the gain of the amplifier 21 to an appropriate range based on the peak value detected by the peak detector 11 so that the electric signal falls within the linear operation range of the amplifier 21. [S21] The amplifier 21 amplifies the electric signal and outputs an amplified signal. [S22] The integrator 23 integrates the amplified signal and outputs an average value of the amplified signal. The average value here is an average value lower than the actual correct average value obtained by averaging including the portion where there is no signal input. [S23] The optical power calculator 24 obtains a correct average value by adding the conversion value C to the average value, and calculates it as optical power.

Then, the display control section 30 controls the display of this optical power. With such an operation, the optical power measuring device 1
Measures and displays the optical power of the optical burst signal. Next, the peak detector 11 will be described. FIG. 5 shows the peak detector 1.
1 is a diagram illustrating a configuration example of FIG. The non-inverting input terminal of the operational amplifier OP1 is used as an input section, and one of the resistor R1 and the capacitor C is connected to the inverting input terminal. Resistor R1 and capacitor C
The other of 1 is connected to GND. The output terminal of the operational amplifier OP1 is connected to the anode side of the diode D, and the cathode side is connected to the resistor R1 and the capacitor C. The output side is the cathode side of the diode D.

Here, when Vin> Vc, the diode D
Turns ON and the capacitor C is charged. Vin <Vc
At this time, the diode D is turned off. Therefore Vin
Is maintained. The time constant of charging and discharging is determined by the capacitance value of the capacitor C and the resistance value of the discharging resistor R1.

Next, the limiter amplifier 12 will be described. FIG. 6 is a diagram illustrating a configuration example of the limiter amplifier 12. One of the resistors R2 is connected to the non-inverting input terminal of OP2, and the other of the resistors R2 is an input unit. The variable voltage VD is connected to the inverting input terminal of OP2. One of the feedback resistors Rf is connected to the output terminal of OP2, and the other is connected to OP2.
2 non-inverting input terminals. One terminal of a resistor R3 is connected to the output terminal of OP2, and a twist is connected to the other terminal of the resistor R3.
The cathode side of the ner diode ZD is connected, and the anode side is connected to GND. The output side is the cathode side of the Zener diode ZD.

Vin is the voltage V of the Zener diode ZD.
When the value exceeds z, the Zener diode ZD breaks down, the gain decreases, and a constant amplitude is output. Also, O
The threshold value is adjusted by the variable voltage VD connected to the inverting input terminal of P2.

Next, the integrator 23 will be described. FIG. 7 is a diagram illustrating a configuration example of the integrator 23. One of the resistors R4 is connected to the non-inverting input terminal of OP3, and the other of the resistors R4 is an input unit. One of the resistors Rd for countermeasures against drift is connected to the inverting input terminal of OP3, and the other is connected to GND. One of the capacitors Cf is connected to the output terminal of OP3 to form an output section, and the other is connected to the non-inverting input terminal of OP3.

The configuration of the integrator 23 can be applied to a circuit configuration in which the constant value is averaged by the conversion value calculator 13 to detect the burst length of the optical burst signal within the burst period.

As described above, the optical power measuring apparatus 1 of the first embodiment converts an optical burst signal into an electric signal, detects a peak value, converts the peak value to a constant amplitude, and converts the converted value C into a constant amplitude. calculate. Then, based on the converted value C, a correct average value is obtained and the optical power is displayed.

Thus, the correct average value of the optical power can be automatically obtained, and the optical power of the optical burst signal can be measured with high accuracy. Also, the peak detector 11
The peak value detected in step (1) is used as the amplitude information, and the range of the amplifier 21 is set based on the amplitude information. Therefore, the optimum range can be set.

Next, a second embodiment will be described.
FIG. 8 is a principle diagram of the optical power measurement device 2 according to the second embodiment. The optical power measuring device 2 includes a photodiode PD, a converted value calculation control unit 10a, an optical power detection control unit 20a, and a display control unit 30, and measures and displays the optical power of the optical burst signal.

The photodiode PD converts a light burst signal into an electric signal. The presence information detector 11a detects presence information of the electric signal converted from the optical burst signal. That is, it is information on the existence of the optical burst signal within the burst period. The limiter amplifier 12a amplifies the value of the presence information to a constant amplitude value. Conversion value calculator 13a
Averages a constant amplitude value, detects the burst length of the optical burst signal within the burst period, and calculates a conversion value C from the burst period and the burst length. The equation for calculating the converted value C is the equation (1) described above.

The amplifier 21a amplifies the electric signal and outputs an amplified signal. The integrator 23a integrates the amplified signal and outputs an average value of the amplified signal. The optical power calculator 24a is:
The optical power is calculated by adding the conversion value C to the average value.

The display controller 30 A / D converts the optical power into a digital value, and displays the digital value. Next, the operation will be described. FIG. 9 is a flowchart showing the overall operation procedure of the optical power measurement device 2. [S30] The photodiode PD converts the optical burst signal into an electric signal. [S31] The conversion value calculation control unit 10a calculates a conversion value C for converting the average value of the electric signal obtained by the optical power detection control unit 20a based on the presence information of the electric signal. [S32] The optical power detection control unit 20a adds the conversion value C to the obtained average value of the electric signal to calculate an actually correct average value and calculates the average value as the optical power. [S33] The display controller 30 displays the optical power.

As described above, the optical power measuring apparatus 2 of the second embodiment calculates the conversion value C from the presence information of the electric signal converted from the optical burst signal, and calculates the conversion value C.
Then, a correct average value is obtained based on the above, and the optical power is displayed.

Thus, the correct average value of the optical power can be automatically obtained, and the optical power of the optical burst signal can be measured with high accuracy. The presence information detector 11 used in the optical power measurement device 2 receives the presence information of the electric signal converted from the optical burst signal, and cannot automatically obtain the amplitude information of the actual input optical signal. No range switching is performed. For this reason, it is possible to reduce the circuit scale of the optical power measurement device that performs manual range switching.

Next, a modified example 1 of the second embodiment will be described. In the first modification, presence information is detected based on drive information from a drive circuit that drives a light emitting source in an optical module. Note that the configuration other than the optical module is the same as that of the second embodiment, and a description thereof will be omitted.

FIG. 10 is a configuration diagram of the first modification. The optical power measuring device 2a includes a photodiode PD, a converted value calculation control unit 10b, a light power detection control unit 20b, and a display control unit 30.
The driving information given to the external optical module 40 is regarded as the presence information of the electric signal, and the optical power of the optical burst signal is measured and displayed based on the driving information.

The optical module 40 comprises an LD 41 which is a light emitting source for generating an optical burst signal, and a drive circuit 42 for driving the LD 41. The optical power measuring device 2a
The presence information is detected based on the drive information given to the drive circuit 42 in the optical module 40. The drive information is a data signal for driving the LD 41, or a clock signal indicating a period during which the data signal exists.

Next, a third embodiment will be described.
FIG. 11 is a principle diagram of the optical power measuring device 3 according to the third embodiment. The optical power measurement device 3 includes a photodiode PD, a switching control unit 10c, an optical power detection control unit 20c, and a display control unit 30, and measures and displays the optical power of the optical burst signal.

The photodiode PD converts a light burst signal into an electric signal. The peak detector 11c detects a peak value of the electric signal. The limiter amplifier 12c amplifies the peak value to a constant amplitude value and outputs an amplitude signal.

The amplifier 21c amplifies the electric signal and outputs an amplified signal. The range switching unit 22c controls the gain of the amplifier 21c to an appropriate range based on the peak value so that the electric signal falls within the linear operation range of the amplifier 21c.
The switch unit 25c receives the amplitude signal from the limiter amplifier 12c, turns on the switch only during a certain period of the amplitude signal, and outputs an amplified signal. The integrator 23c integrates the amplified signal output from the switch unit 25c and outputs an average value of the amplified signal as optical power. Since this average value is obtained by averaging only the portion where the electric signal exists, it is an actual correct average value.

The display control unit 30 A / D converts the optical power into a digital value and displays the digital value. Next, the operation will be described. FIG. 12 is a flowchart showing the overall operation procedure of the optical power measuring device 3. [S40] The photodiode PD converts the optical burst signal into an electric signal. [S41] The switching control unit 10c detects the peak value of the electric signal, amplifies it to a constant amplitude value, and outputs an amplitude signal. [S42] The optical power detection control unit 20c receives the amplitude signal from the switching control unit 10c, performs switching control only during a period in which an electric signal is present, calculates a correct average value, and calculates the average value as optical power. [S43] The display controller 30 displays the optical power.

Next, the switching operation of the switch section 25c will be described. FIG. 13 is a diagram illustrating a switching operation in the switch unit 25c. For the amplitude signal as shown in the figure, the H period is a period in which an electric signal exists, and the L period is a period in which no electric signal exists. Therefore, the switch is ON during the period of H, and the switch is OFF during the period of L.

As described above, the optical power measuring apparatus 3 according to the third embodiment converts an optical burst signal into an electric signal, detects a peak value, obtains an amplitude signal, and performs switching control using this amplitude signal. Then, a correct average value was obtained and the optical power was displayed.

As a result, a correct average value of the optical power can be automatically obtained, and the optical power of the optical burst signal can be measured with high accuracy. Also, the peak detector 11
The peak value detected at c is used as the amplitude information, and the range of the amplifier 21c is set based on this, so that the optimum range can be set.

Next, a fourth embodiment will be described.
FIG. 14 is a principle diagram of the optical power measuring device 4 according to the fourth embodiment. The optical power measurement device 4 includes a photodiode PD, a switching control unit 10d, an optical power detection control unit 20d, and a display control unit 30, and measures and displays the optical power of an optical burst signal.

The photodiode PD converts a light burst signal into an electric signal. The presence information detector 11d detects presence information of the electric signal. The limiter amplifier 12d
The presence information is amplified to a certain amplitude value and an amplitude signal is output.

The amplifier 21d amplifies the electric signal and outputs an amplified signal. The switch unit 25d receives the amplitude signal from the limiter amplifier 12d, turns on the switch only during a certain period of the amplitude signal, and outputs an amplified signal. Integrator 23
d integrates the amplified signal output from the switch unit 25d and outputs the average value of the amplified signal as optical power. Since this average value is obtained by averaging only the portion where the electric signal exists, it is an actual correct average value.

The display control unit 30 A / D converts the optical power into a digital value, and displays the digital value. Next, the operation will be described. FIG. 15 is a flowchart showing the operation procedure of the optical power measuring device 4. [S50] The photodiode PD converts the optical burst signal into an electric signal. [S51] The switching control unit 10d amplifies the value of the presence information to a certain amplitude value based on the presence information of the electric signal, and outputs an amplitude signal. [S52] The optical power detection control unit 20d receives the amplitude signal from the switching control unit 10d, performs switching control only during a period in which an electric signal is present, calculates a correct average value, and calculates it as optical power. [S53] The display controller 30 displays the optical power.

As described above, the optical power measuring device 4 according to the fourth embodiment generates an amplitude signal based on the presence information of the electric signal converted from the optical burst signal, controls the switching, and performs the switching control to obtain the correct average value. And the optical power is displayed.

Thus, the correct average value of the optical power can be automatically obtained, and the optical power of the optical burst signal can be measured with high accuracy. Note that the presence information detector 11d used in the optical power measuring device 4 does not perform automatic range switching because the presence information of the electric signal is input and thus the actual amplitude information of the input optical signal cannot be obtained. For this reason, it is possible to reduce the circuit scale of the optical power measurement device that performs manual range switching.

Next, a first modification of the fourth embodiment will be described. In the first modification, presence information is detected based on drive information from a drive circuit that drives a light emitting source in an optical module. The configuration other than the optical module is the same as that of the fourth embodiment, and the description is omitted.

FIG. 16 is a configuration diagram of the first modification. The optical power measuring device 4a includes a photodiode PD, a conversion value calculation control unit 10e, an optical power detection control unit 20e, and a display control unit 30.
The drive information from the external optical module 40 is used as the presence information of the electric signal, and the optical power of the optical burst signal is measured and displayed.

The optical module 40 comprises an LD 41 which is a light emitting source for generating an optical burst signal, and a drive circuit 42 for driving the LD 41. The optical power measuring device 4a includes:
The presence information is detected based on the drive information given to the drive circuit 42 in the optical module 40. The drive information is a data signal for driving the LD 41, or a clock signal indicating a period during which the data signal exists.

Next, the display control unit 30 of the optical power measuring device will be described. FIG. 17 shows the display screen unit 3 of the display control unit 30.
FIG. The display screen unit 31 includes a display screen 31a.
, Operation button 31b and interface unit 31
c. The display screen 31a digitally displays a measured value such as an optical power value. The operation buttons 31b include various buttons for setting a measurement speed, a memory function, and the like. The interface unit 31c is a connector for connecting an optical fiber.

Next, the optical power measuring method of the present invention will be described. FIG. 18 is a flowchart showing a processing procedure of the optical power measuring method of the present invention. [S60] The optical burst signal is converted into an electric signal. [S61] The peak value of the electric signal is detected. [S62] The peak value is amplified to a constant amplitude value. [S63] A constant amplitude value is averaged to detect the burst length of the optical burst signal within the burst period. [S64] A conversion value is calculated from the burst period and the burst length. [S65] The electric signal is amplified to generate an amplified signal. [S66] The amplified signal is integrated to calculate an average value of the amplified signal. [S67] The optical power is calculated by adding the converted value to the average value. [S68] The optical power is A / D converted to a digital value, and the digital value is displayed.

When an amplified signal is generated by amplifying an electric signal, the gain is controlled to an appropriate range based on the peak value and amplified. As described above, the optical power measuring method of the present invention converts an optical burst signal into an electric signal, detects a peak value, detects the burst length of the optical burst signal within the burst period, and determines the burst period and the burst length. The conversion value is calculated from the above. Then, the converted value and the average value are added to obtain the optical power.

As a result, a correct average value of the optical power can be obtained, and the optical power of the optical burst signal can be measured with high accuracy.

[0066]

As described above, the optical power measuring apparatus of the present invention converts an optical burst signal into an electric signal, detects a peak value, and calculates a converted value by setting the peak value to a constant amplitude. Then, based on the converted value, a correct average value is obtained and the optical power is displayed. Thereby, a correct average value of the optical power can be automatically obtained, and the optical power of the optical burst signal can be measured with high accuracy.

In the optical power measuring method according to the present invention, the optical burst signal is converted into an electric signal, the peak value is detected, and the converted value is calculated by setting the peak value to a constant amplitude. Then, a correct average value is obtained based on the converted value, and the optical power is displayed. Thereby, a correct average value of the optical power can be automatically obtained, and the optical power of the optical burst signal can be measured with high accuracy.

[Brief description of the drawings]

FIG. 1 is a principle diagram of an optical power measurement device according to a first embodiment.

FIG. 2 is a flowchart illustrating an overall operation procedure according to the first embodiment;

FIG. 3 is a flowchart illustrating an operation procedure of a conversion value calculation control unit according to the first embodiment.

FIG. 4 is a flowchart illustrating an operation procedure of the optical power detection control unit according to the first embodiment.

FIG. 5 is a diagram illustrating a configuration example of a peak detector.

FIG. 6 is a diagram illustrating a configuration example of a limiter amplifier.

FIG. 7 is a diagram illustrating a configuration example of an integrator.

FIG. 8 is a principle diagram of an optical power measurement device according to a second embodiment.

FIG. 9 is a flowchart illustrating an overall operation procedure according to the second embodiment.

FIG. 10 is a configuration diagram of a first modification of the second embodiment.

FIG. 11 is a principle diagram of an optical power measuring device according to a third embodiment.

FIG. 12 is a flowchart illustrating an overall operation procedure according to the third embodiment;

FIG. 13 is a diagram illustrating a switching operation in a switch unit.

FIG. 14 is a diagram illustrating the principle of an optical power measurement device according to a fourth embodiment.

FIG. 15 is a flowchart illustrating an operation procedure according to the fourth embodiment.

FIG. 16 is a configuration diagram of a first modification of the fourth embodiment.

FIG. 17 is a diagram illustrating a display screen unit of a display control unit.

FIG. 18 is a flowchart showing a processing procedure of the optical power measuring method according to the present invention.

FIG. 19 is a configuration diagram of a conventional optical power measuring device compatible with an optical burst signal.

FIG. 20 is a diagram showing an average value obtained by a conventional optical power measuring device.

FIG. 21 is a diagram showing a range obtained by a conventional optical power measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical power measuring device 10 Conversion value calculation control part 11 Peak detector 12 Limiter amplifier 13 Conversion value calculator 20 Optical power detection control part 21 Amplifier 22 Range switching part 23 Integrator 24 Optical power calculator 30 Display control part PD photodiode

Claims (8)

[Claims] 1. An optical power measuring device for measuring optical power of an optical burst signal, comprising: a photodiode for converting the optical burst signal into an electric signal; a peak detector for detecting a peak value of the electric signal; A limiter amplifier for amplifying the value to a constant amplitude value, a conversion value for averaging the constant amplitude value, detecting a burst length of the optical burst signal within a burst period, and calculating a conversion value from the burst period and the burst length. A calculator, a conversion value calculation control unit configured from: an amplifier that amplifies the electric signal and outputs an amplified signal;
A range switching unit that controls the gain of the amplifier to an appropriate range so that the electric signal falls within the linear operation range of the amplifier based on the peak value; and an average of the amplified signal by integrating the amplified signal. A light power detection control unit comprising: an integrator that outputs a value; a light power calculator that calculates the light power by adding the converted value to the average value; and A / D conversion of the light power And a display control unit for converting the digital value into a digital value and displaying the digital value. 2. An optical power measuring apparatus for measuring optical power of an optical burst signal, comprising: a photodiode for converting the optical burst signal into an electric signal; a presence information detector for detecting presence information of the electric signal;
A limiter amplifier for amplifying the value of the presence information to a constant amplitude value, and averaging the constant amplitude value to detect a burst length of the optical burst signal within a burst cycle, and calculate a conversion value from the burst cycle and the burst length. A conversion value calculator configured to calculate, a conversion value calculation control unit including: an amplifier that amplifies the electric signal and outputs an amplified signal;
An optical power detector that integrates the amplified signal and outputs an average value of the amplified signal; and an optical power calculator that calculates the optical power by adding the converted value to the average value. An optical power measurement device, comprising: a control unit; and a display control unit that A / D converts the optical power to a digital value and displays the digital value. 3. The apparatus according to claim 2, wherein the presence information detector is a peak detector that detects the presence information based on drive information from a drive circuit that drives a light source of the optical burst signal. The optical power measurement device according to claim 1. 4. An optical power measuring apparatus for measuring the optical power of an optical burst signal, comprising: a photodiode for converting the optical burst signal into an electric signal; a peak detector for detecting a peak value of the electric signal; A switching control unit configured to amplify the value to a constant amplitude value and output an amplitude signal, and an amplifier that amplifies the electric signal and outputs an amplified signal;
A switch section that receives the amplitude signal and turns on the switch only during a period in which the constant amplitude value is present to output the amplified signal; and integrates the amplified signal output from the switch section and averages the amplified signal. A light power detection control unit configured to output a value as light power; and a display control unit configured to A / D convert the light power to a digital value and display the digital value. An optical power measurement device, characterized in that: 5. An optical power measuring device for measuring optical power of an optical burst signal, comprising: a photodiode for converting the optical burst signal into an electric signal; a presence information detector for detecting presence information of the electric signal;
A limiter amplifier configured to amplify the value of the presence information to a certain amplitude value and output an amplitude signal; and a switching controller configured to amplify the electric signal and output an amplified signal.
A switch section that receives the amplitude signal and turns on the switch only during a period in which the constant amplitude value is present to output the amplified signal; and integrates the amplified signal output from the switch section and averages the amplified signal. An optical power detection control unit configured to output a value as optical power; and a display control unit configured to A / D convert the optical power into a digital value and display the digital value. An optical power measurement device, characterized in that: 6. The apparatus according to claim 5, wherein the presence information detector is a peak detector that detects the presence information based on drive information from a drive circuit that drives a light emitting source of the optical burst signal. The optical power measurement device according to claim 1. 7. An optical power measuring method for measuring optical power of an optical burst signal, wherein the optical burst signal is converted into an electric signal, a peak value of the electric signal is detected, and the peak value is amplified to a constant amplitude value. Averaging the constant amplitude value to detect a burst length of the optical burst signal within a burst cycle, calculating a conversion value from the burst cycle and the burst length, and amplifying the electrical signal to obtain an amplified signal. Generating, integrating the amplified signal, calculating an average value of the amplified signal, adding the converted value to the average value, calculating the optical power, A / D converting the optical power to a digital value, And the digital value is displayed. 8. The optical device according to claim 7, wherein when the electrical signal is amplified to generate the amplified signal, the gain is controlled to an appropriate range based on the peak value and amplified. Power measurement method.