CN201766596U - Device increasing transmission distance of optical supervisory channel - Google Patents

Abstract

The utility model relates to a device for improving the transmission distance of an optical monitoring channel, comprising: an optical monitoring channel transmitter located at a transmitting side for emitting monitoring channel light; an optical monitoring channel receiver located at a receiving side for receiving monitoring channel light; At least one supervisory channel optical amplifier between the optical supervisory channel transmitter and the optical supervisory channel receiver is dedicated to amplifying the supervisory channel light. Because the utility model adds a module based on the principle of semiconductor optical amplification in the wavelength division equipment to amplify the light of the optical monitoring channel to realize the optical amplification of the monitoring channel, so the utility model can increase the transmission distance of the optical monitoring channel, The requirements for the optical output power of the monitoring channel optical transmitter and the sensitivity of the receiver are reduced, thereby reducing the overall configuration cost of the system.

Description

Device for Improving Transmission Distance of Optical Monitoring Channel

technical field

The utility model relates to optical monitoring channel transmission, in particular to a device for increasing the transmission distance of the optical monitoring channel.

Background technique

The optical monitoring channel in the WDM system uses 1510 wavelength for transmission. This wavelength is outside the effective amplification range of the EDFA amplifier and cannot be amplified by the amplifier on the main optical channel. The transmission distance will be severely limited. In some long-span system applications, due to the limitation of the transmission distance of the monitoring channel light, the system configuration has to be modified. On the other hand, in order to improve its transmission distance, the equipment for the optical transmitter and receiver of the monitoring channel light Higher requirements are put forward, which makes it difficult to control the cost of products.

Figure 1 is the existing system configuration scheme. The monitoring channel light and signal light emitted by the optical monitoring channel transmitter of the transmitting party (that is, site A shown in Figure 1) are combined by a multiplexer and sent to the receiving party via the line light. (i.e. site B shown in Figure 1). On the receiving side, an optical splitter is used to separate the signal light with a wavelength of 1550nm on the main optical channel and the monitoring channel light with a wavelength of 1510nm, and the monitoring channel light is directly connected to the optical monitoring channel receiver. The line drawn by the arrow in the figure is the optical fiber, the direction of the arrow is the direction of light transmission, and 1550nm and 1510nm refer to the wavelength of the light propagating in the light.

The transmitter and receiver of the monitoring channel are single-mode SFP optical modules. At present, the transmission distance supported by ordinary single-mode SFP modules is 150 kilometers. If the line fiber span on the main optical channel is greater than 150 kilometers, the monitoring channel will not be available. .

Contents of the invention

The utility model aims at the problem that the optical transmission distance of the monitoring channel is limited, and provides a device for increasing the transmission distance of the optical monitoring channel by specially amplifying the monitoring channel light, so as to solve the above-mentioned problems in the prior art.

The device for improving the transmission distance of the optical monitoring channel of the present utility model comprises:

an optical supervisory channel transmitter positioned at the transmitting side to emit supervisory channel light;

an optical supervisory channel receiver located at the receiving side for receiving supervisory channel light;

At least one supervisory channel optical amplifier dedicated to amplifying the supervisory channel light is disposed between the optical supervisory channel transmitter and the optical supervisory channel receiver.

Wherein, the supervisory channel optical amplifier can be set at the transmitting side and/or the receiving side.

In the case that the monitoring channel optical amplifier is set at the transmitting side, the monitoring channel optical amplifier is set between the monitoring channel optical amplifier and the transmitting side multiplexer and/or after the transmitting side multiplexer.

In the case that the supervisory channel optical amplifier is arranged on the receiving side, the supervisory channel optical amplifier is arranged between the receiving side demultiplexer and the optical supervisory channel receiver and/or before the receiving side demultiplexer.

The monitoring channel optical amplifier of the utility model includes: an optical path part for amplifying the monitoring channel light and a circuit part for adjusting the optical amplification gain of the optical path part. The optical path part includes: a first isolator for receiving external incident light; a semiconductor FP cavity connected to the output end of the first isolator to amplify the incident light; connected to the output end of the semiconductor EP cavity to output the light amplified by the semiconductor FP cavity light to the second opto-isolator. The circuit part includes: a controller calculating and outputting a digital control signal according to a gain control command; a digital-to-analog converter connected to the output terminal of the controller to convert the digital control signal into an analog voltage signal; and a digital-to-analog converter connected to the The output terminal of the device converts the analog voltage signal into a current signal and then injects it into the voltage-controlled current source of the semiconductor FP cavity.

In addition, the transmitting side also has an optical power amplifier for amplifying the signal light, and a multiplexer for combining the amplified signal light and the monitoring channel light; the receiving side also has an optical power amplifier for separating the signal light and the monitoring channel light a wave splitter, and an optical preamplifier for amplifying the signal light split from the wave splitter.

Furthermore, when the supervisory channel optical amplifier is arranged before the supervisory channel receiver, the supervisory channel optical amplifier is preferably integrated inside the optical supervisory channel receiver.

Since a module based on the principle of semiconductor optical amplification is added to the wavelength division equipment to amplify the light of the optical monitoring channel to realize the optical amplification of the monitoring channel, the utility model has the following advantages:

1. Increase the transmission distance of the optical monitoring channel;

2. Reduce the requirements for the optical output power of the monitoring channel optical transmitter and the sensitivity of the receiver, thereby reducing the overall configuration cost of the system.

The utility model is described in detail below in conjunction with accompanying drawing.

Description of drawings

FIG. 1 is a schematic diagram of a system optical path configuration in the prior art;

Fig. 2 is the schematic diagram of system optical path configuration of the present utility model;

Fig. 3 is a schematic diagram of an embodiment of the utility model;

Fig. 4 is a schematic diagram of the internal structure of the semiconductor optical amplifier of the present invention.

Detailed ways

Fig. 2 shows the device for improving the transmission distance of the optical monitoring channel of the present utility model. The line drawn by the arrow in the figure is an optical fiber, and the direction of the arrow is the direction of light transmission. On the basis of the above, an amplification device is added, which can independently amplify the 1510nm optical monitoring channel.

As shown in Figure 2, the device for improving the transmission distance of the optical monitoring channel of the present invention includes:

The optical supervisory channel transmitter that launches the supervisory channel light that is positioned at the transmitter (i.e. the A site shown in Figure 2);

An optical supervisory channel receiver that receives supervisory channel light at the receiver (i.e. site B shown in Figure 2);

At least one supervisory channel optical amplifier dedicated to amplifying the supervisory channel light arranged between the optical supervisory channel transmitter and the optical supervisory channel receiver, although Fig. 2 shows 4 such amplifiers, in actual In application, it can be flexibly configured according to the actual line optical fiber transmission distance and cost budget, that is, it can be used alone or in combination, for example, only one amplifier is set.

As shown in Figure 2, the supervisory channel optical amplifier can be arranged on the transmitting side, so that the transmitting party sends the amplified supervisory channel light to the optical supervisory channel receiver via the line fiber, and/or is arranged on the receiving side, so that the receiving side After amplifying the supervisory channel light transmitted through the line optical fiber, it is sent to the optical supervisory channel receiver.

In the case that the monitoring channel optical amplifier is set at the transmitting side, as shown in FIG. 2 , the monitoring channel optical amplifier is set between the monitoring channel optical amplifier and the transmitting side multiplexer and/or after the transmitting side multiplexer.

In the case where the supervisory channel optical amplifier is set on the receiving side, as shown in Figure 2, the supervisory channel optical amplifier is set between the receiving side demultiplexer and the optical supervisory channel receiver and/or is arranged on the receiving side splitter before the oscilloscope.

Figure 3 shows an example where only one supervisory channel optical amplifier is set at the receiving side. The supervisory channel amplifier and optical supervisory channel receiver are integrated on one circuit board to amplify the 1510nm wavelength supervisory channel light before receiving it.

The supervisory channel amplifier shown in Fig. 3 is a semiconductor optical amplifying device, including (see Fig. 4): an optical circuit part for amplifying supervisory channel light; and a circuit part for adjusting the optical amplification gain of the optical circuit part.

Fig. 4 has shown the internal structure of semiconductor optical amplifying device, and optical path part comprises: the first optical isolator that receives external incident light; The semiconductor FP cavity that amplifies the incident light from the first isolator, the input end of this semiconductor FP cavity The output end of the first optical isolator is connected; the second optical isolator that outputs the amplified light, the input end of the second optical isolator is connected with the output end of the semiconductor FP cavity. The optical path part completes the conversion of current energy into light to realize signal amplification. The external incident light is coupled to the first isolator 1 through the optical fiber, and the second optical isolator 2 is coupled to the external optical fiber. The feature of the isolator is unidirectional light guide, that is, the light can only be transmitted along the direction of the light-incoming-light-out arrow in the figure, and the light transmitted in the opposite direction is isolated to prevent the interference between the scattered light inside the amplifier and the external signal light.

The optical circuit part is used to amplify the monitoring channel light, and the circuit part generates the current used to inject into the semiconductor FP (Fabry-Pérot) cavity.

The first isolator 1, the semiconductor FP cavity and the second optical isolator 2 are sequentially connected by an optical waveguide, which can be realized by a glass substrate or an optical fiber as an optical transmission medium inside the amplifier.

As a gain medium, the semiconductor FP cavity converts the energy injected by the current in the circuit part into light energy, and plays a role in amplifying the incident light.

The circuit part includes: a controller that calculates and outputs a digital control signal according to the gain control command; a digital-to-analog converter that converts the digital control signal output by the controller into an analog voltage signal, wherein the input of the digital-to-analog converter is connected to the input of the controller terminal; and a voltage-controlled current source that converts the analog voltage signal output by the digital-to-analog converter into a current signal and injects it into the semiconductor FP cavity, wherein the input terminal of the voltage-controlled current source is connected to the output terminal of the digital-to-analog converter.

The circuit part is responsible for converting the external gain control command into a current signal and injecting it into the optical circuit part. Realize adjustable optical amplification gain. Specifically, the controller receives the external gain control command, calculates the digital control signal to the digital-to-analog converter; the digital-to-analog converter converts the digital signal from the controller into an analog voltage signal to the voltage-controlled current source; the voltage-controlled current source will The voltage signals of different sizes are converted into current signals and injected into the optical circuit part.

It should be noted that the semiconductor amplifying device shown in FIG. 4 can be applied to any amplifier shown in FIG. 2 for amplifying monitor channel light.

Referring to Fig. 3, the transmitter also has an optical power amplifier for amplifying the signal light with a wavelength of 1550nm, and a multiplexer for combining the amplified signal light and the monitoring channel light with a wavelength of 1510nm; the receiver also has It has a wave splitter for separating signal light with a wavelength of 1550nm and a monitor channel light with a wavelength of 1510nm, and an optical preamplifier for amplifying the signal light split from the wave splitter.

Although the utility model has been described in detail above, the utility model is not limited thereto, and those skilled in the art can make various modifications according to the principles of the utility model. Therefore, all modifications made according to the principle of the utility model should be understood as falling into the protection scope of the utility model.

Claims (9)

1. device that improves the Optical Supervisory Channel transmission range is characterized in that comprising:

Be positioned at the Optical Supervisory Channel transmitter of the monitoring of emission channel light of emission side;

Be positioned at the Optical Supervisory Channel receiver of recipient's reception monitoring and controlling channels light;

At least one that is arranged between described Optical Supervisory Channel transmitter and the described Optical Supervisory Channel receiver is exclusively used in the monitoring and controlling channels image intensifer that amplifies described monitoring and controlling channels light.

2. device according to claim 1 is characterized in that described monitoring and controlling channels image intensifer is arranged on emission side and/or recipient.

3. device according to claim 1 is characterized in that described monitoring and controlling channels image intensifer is arranged between described monitoring and controlling channels image intensifer and the emission side's wave multiplexer and/or is arranged on after the described emission side wave multiplexer.

4. according to claim 1 or 3 described devices, it is characterized in that described monitoring and controlling channels image intensifer is arranged between described recipient's channel-splitting filter and the Optical Supervisory Channel receiver and/or is arranged on before described recipient's channel-splitting filter.

5. require 4 described devices according to aforesaid right, it is characterized in that described monitoring and controlling channels image intensifer is integrated in Optical Supervisory Channel receiver inside.

6. device according to claim 1 is characterized in that described monitoring and controlling channels image intensifer comprises: amplify the light path part of monitoring and controlling channels light and the circuit part of the light amplification gain of regulating described light path part.

7. device according to claim 6 is characterized in that described light path part comprises:

Receive first isolator of outside light inlet;

Connect the semiconductor FP chamber of the described first isolator output so that light inlet is amplified;

Connect described semiconductor EP chamber output with second optical isolator of output via the light of semiconductor FP chamber amplification.

8. device according to claim 7 is characterized in that described circuit part comprises:

Calculate and export the controller of digital controlled signal according to gain control instruction;

Connect described controller output end described digital controlled signal is converted to the digital to analog converter of analog voltage signal; And

Connect described digital to analog converter output and after analog voltage signal being converted to current signal, inject the voltage-controlled current source of giving semiconductor FP chamber.

9. device according to claim 1 is characterized in that described emission side also has a power amplifier that is used for amplifying signal light, and the wave multiplexer that will merge through amplifying signal light and monitoring and controlling channels light; Described recipient also has the channel-splitting filter that separates described flashlight and monitoring and controlling channels light, and the light preamplifier that amplifies the flashlight of telling from described channel-splitting filter.

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