JPH01149593A - Photo cross connecting device - Google Patents

Abstract

PURPOSE:To scale up a circuit by composing the output of a first wavelength selecting converting means by a composing distributing means, branching an input by a second wavelength selecting converting means, selecting each wavelength and converting into the former wavelength by one by one a control signal. CONSTITUTION:The signal data of wavelengths lambda1-lambdan modulated by signal data are inputted from A-D stations to wavelength modulating modules 6-1-6-4 and branches into (n) signal data. They are inputted to wavelength selecting converting elements, one wavelength is selected and converted into a different wavelength lambda11 by a control signal and it is received by a photocoupler. The photocoupler composes inputted wavelengths lambda11-lambda1n and adds it to a multiplexer/demultiplexer 7. The demultiplexer composes the signal data, branches the output into four pieces and adds them to wavelength converting modules 8-1-8-4. The inputted signal data composed of 4Xn wavelength are inputted to the wavelength selecting converting elements, each wavelength is selected and covered into the former wavelengths lambda1-lambdan by the control signal. These outputs are composed and they are transferred to the A-D stations.

Description

[Detailed Description of the Invention] [Summary] In optical communications, optical cross-connect devices are used to connect telephone offices (hereinafter referred to as offices). The aim is to provide an optical cross-connect device that can be scaled up, and is wavelength-multiplexed using n wavelengths λ1 to λn.
Line signal data is input, this is branched into n pieces, one wavelength is selected from each using a control signal from the control circuit, and signal data of a predetermined wavelength different from wavelengths λ1 to λn is generated. a first wavelength selective converting means for converting the signal data and combining and outputting the signal data; a combining/distributing means for combining the output signal data of the first wavelength selective converting means and branching into m pieces; Each of the m branched outputs of the means is branched into n outputs, and one wavelength is selected from a plurality of (m×n) wavelengths by a control signal from the control circuit, and the original wavelength is restored. and a second wavelength selective conversion means for converting wavelengths from λ1 to λn.

[Industrial application field]

The present invention relates to an improvement in an optical cross-connect device for connecting stations in optical communications.

At this time, there is a need for an optical cross-connect device that requires only a small circuit scale for the matrix switch and allows for large-scale input/output lines.

[Conventional technology]

FIG. 6 is a diagram showing a transmission network using an example of a cross-connect device.

FIG. 7 is a block diagram showing the configuration of a conventional cross-connect device.

In a transmission network connecting each station (stations A to D) as shown in FIG. 6, it is desired to expand the transmission capacity and to be able to freely change the transmission capacity between each station.

Therefore, instead of directly connecting each station, a method is being adopted in which the stations are connected via a cross-connect device as shown in the figure.

Here, the cross-connect device is used to switch the transmission capacity between stations, that is, to switch the number of lines.

FIG. 7 shows the configuration of a cross-connect device constructed using a conventional technique.

In Figure 7, each station (referred to as A, BSC, and D station)
From there, time-division multiplexed 2Gb/s optical signal data is sent via optical fibers using four 500 Mb/s lines. This is converted into electrical signal data by optical/electrical conversion elements (hereinafter referred to as 0/B) in the cross-connect device (hereinafter referred to as 0/B) 1 to 1-4, and then further multiplexed and demultiplexed circuit (hereinafter referred to as DMUX) 2- The signal data time-division multiplexed using 1 to 2-4 is separated into four 500 Mb/s lines. This is added to the matrix switch 3 and switched in units of 500 Mb/s lines by control signals from a control circuit (not shown). In the matrix switch in the same figure, as shown by the marks, the ■ line input from station A goes to ■° input from B station, the ■ line input from station 0 goes to ■゛, and the ■ line goes to D station. It also shows that the line ■ is being switched to the line ■° input from station B.

Note that a multiplexing circuit (hereinafter referred to as MUX) 4-
1 to 4-4 multiplex the signal data of 2 Gb/s to electrical/optical conversion elements (hereinafter referred to as E10) 5-1 to 5.
-5, it is converted into optical signal data again and transferred to the A station, B station, 0 station, and D station via the optical fiber.

[Problem that the invention seeks to solve]

However, in the above-mentioned cross-connect device, 1
The transmission speed that can be sent using optical fiber is limited to several Gb/s due to the limitations of electric circuits, especially the characteristics of transistors, etc., and there are problems in that the scale of input and output circuits is dramatically increased, and the electric matrix The switch has a problem in that the circuit size increases as the square of the number of lines n, making it difficult to switch a large number of lines.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical cross-connect device in which the circuit scale of a matrix switch is small and the scale of input/output lines can be increased.

[Means for solving problems]

The above problem is solved by the device configuration shown in FIG.

In FIG. 1, 60-1 to 60-m input the signal data of m lines wavelength-multiplexed by n wavelengths λ1 to λn, branch it into n pieces, and control it from the control circuit. This is a first wavelength selection conversion means that selects one wavelength from each signal, converts it into signal data of a predetermined wavelength different from the wavelengths λ1 to λn, and synthesizes and outputs the signal data.

Reference numeral 70 denotes a combining/distributing means that combines the signal data output from the first wavelength selection converting means 60-1 to 60-4 and branches it into m pieces.

80-1 to 80-m are each of the m branched outputs of the combining/distributing means 70, branched into n wavelengths, and selected from a plurality of (m×n) wavelengths by a control signal from a control circuit. This is a second wavelength selective conversion means that selects each wavelength and converts it to the original wavelengths λ1 to λn.

[For production]

In FIG. 1, n signal data multiplexed by λ1 to λn input from m lines is transmitted to the first wavelength selection conversion means 6.
Each of 0-1 to 60-m is branched into n pieces.

Then, one wavelength is selected from each of the n branches by a control signal from the control circuit, and converted into signal data of a wavelength different from the wavelengths λ1 to λn. These converted signal data of n wavelengths are combined and output.

In the combining/distributing means 70, the outputs of the m first wavelength selection converting means 60-1 to 60-m are combined and branched into m wavelengths.

Next, in the second wavelength selection conversion means 80-1 to 80-m, the above input is branched into n pieces, and each
One wavelength is selected from X n wavelengths by a control signal and converted to the original wavelengths λ1 to λn.

In this way, switching can be performed for each wavelength λ1 to λn.

〔Example〕

FIG. 2 is a block diagram showing the configuration of an optical cross-connect device according to an embodiment of the present invention.

FIG. 3 is a diagram showing the wavelength distribution at each point of the optical cross-connect device of the embodiment.

FIG. 4 is a block diagram of a wavelength conversion module used in the embodiment.

FIG. 5 is a block diagram of the configuration of station A in the embodiment.

The same reference numerals indicate the same objects throughout the figures.

In FIG. 2, wavelengths λ1, λ2, --- modulated by signal data from stations A, B, 0, and D, respectively.
The signal data of 1λn is input to the wavelength conversion modules 6-1 to 6-4 in the optical cross-connect device. For example, signal data input to the wavelength conversion module 6-1 is input to the optical coupler 9 in the wavelength conversion module whose configuration is shown in FIG. 4(a), and the input signal data is branched into n signal data. .

This is input to a laser diode (hereinafter referred to as LD) 10-1 as a wavelength selective conversion element. LDIO-1
is controlled by a control signal from the control circuit 12 to control n wavelengths λ1
Select one wavelength from the signal data multiplexed with ~λn, and change that wavelength to, for example, a wavelength λ1 different from the above n wavelengths.
Convert to 1 and output. This output is received by the optical coupler 11. Similarly, the other LDIO-2 to LDIO-n output wavelengths λ12 to λ1n, and are received by the optical coupler 11.

The input wavelengths λ11 to λ1n are combined by the optical coupler 11 and applied to the optical multiplexer/distributor 7 via an optical fiber. Similarly to the above, the signal data from the B station, 0 station, and D station are converted to λ21 to λ by the wavelength conversion modules 6-2 to 6-4.
2n, λ31 to λ3ns, and λ41 to λ4n and added to the optical combiner/distributor 7.

The optical confluencer/distributor 7 is made of an optical coupler, and the wavelengths λ11 to λ1n of the outputs of the wavelength conversion modules 6-1 to 6-4,
λ21~λ2ns λ31~λ3n, and λ41~λ4
n signal data are combined and the output is branched into four.

The distribution of this output wavelength is shown in (■) in FIG.

This output is applied to wavelength conversion modules 8-1 to 8-4, the configuration of which is shown in FIG. 4(b). The signal data consisting of 4xH wavelengths inputted to the optical coupler 13 shown in FIG.
One wavelength is selected from each input by the control signal of the output of 6 and converted to the original wavelengths λ1, λ2, ---, λn.

These outputs are respectively input to the optical coupler 15, combined, and transferred to the A station, B station, 0 station, and D station via optical fibers. This is shown in FIG. 5 for the case of station A.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to create an optical cross-connect device in which the circuit scale of the matrix switch can be reduced (n times) and the scale of input/output lines can be increased.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a block diagram showing the configuration of an optical cross-connect device according to an embodiment of the present invention, and Fig. 3 is a diagram showing the wavelength distribution at each point of the optical cross-connect device according to an embodiment. 4 is a configuration block diagram of a wavelength conversion module used in the embodiment, FIG. 5 is a configuration block diagram of station A in the embodiment, and FIG. 6 is a transmission network using an example of a cross-connect device. FIG. 7 is a block diagram showing the configuration of a conventional cross-connect device. In the figure, 60-1 to 60-n+ are first wavelength selection conversion means, 70
80-1 to 80-m represent the combining/distributing means and the second wavelength selective conversion means. $ 1 Figure wavelength hand 5 evil

Claims (1)

[Claims] Wavelength multiplexed by n wavelengths (λ_1 to λ_n)
Line signal data is input, this is branched into n pieces, one wavelength is selected from each by a control signal from the control circuit, and a predetermined wavelength different from the wavelengths (λ_1 to λ_n) is selected. First wavelength selection conversion means (60-1 to 60-
m), a combining/distributing means (70) which combines the signal data of the output of the first wavelength selection conversion means (60-1 to 60-m) and branches into m pieces; and the combining/distributing means (70). ), each of the m branched outputs is branched into n outputs, and one wavelength is selected from a plurality of (m×n) wavelengths by a control signal from the control circuit, and the original An optical cross-connect device comprising second wavelength selection conversion means (80-1 to 80-m) that converts wavelengths (λ_1 to λ_n).