JP4819786B2 - Optical cross-connect device - Google Patents

Description

  The present invention relates to an optical cross-connect device that switches a plurality of optical signal paths. In particular, the present invention relates to an optical cross-connect device that can make an optical switch that performs optical signal switching processing redundant, and can also support redundant transmission paths.

  In general, in an optical network system, an optical cross-connect device is used to freely set and switch a plurality of optical signal paths. The optical cross-connect device is basically composed of a plurality of optical signal input units and optical signal output units, and a switch unit that connects these input / output units, and an arbitrary optical signal input unit and optical signal output are controlled by the switch unit. The units are uniquely connected, and these connection combinations can be changed as required (Patent Document 1). In many cases, an optical switch that performs switching without converting an optical signal into an electrical signal is often used as the switch unit of the optical cross-connect device from the viewpoint of simplicity of configuration, cost, and reliability.

  FIG. 9 shows a configuration example of an optical network system in which nodes including such an optical cross-connect device are connected by an optical fiber transmission line to transmit an optical signal. In FIG. 9, for simplicity, the number of input / output paths of each of the optical cross-connect devices 10-1 to 10-4 is two, and the optical cross-connect device 10-1 and the optical cross-connect devices 10-2 and 10- 3 are connected via optical fiber transmission lines 1 and 2, respectively, and optical cross-connect devices 10-2 and 10-3 and optical cross-connect device 10-4 are connected via optical fiber transmission lines 3 and 4, respectively. It is a configuration.

  In general, when the number of routes is M (M is an integer of 2 or more), one optical cross-connect device 10 is connected to M optical fiber transmission lines in each input / output route. Further, in the case of performing wavelength division multiplexing transmission, assuming that the number of wavelength multiplexing is N (N is an integer of 2 or more), the optical signals on the M optical fiber transmission lines are respectively transmitted through the optical wavelength separator 11 to N light beams. The signals are separated and connected to (N × M) input ports of the optical switch 12. Further, when client signals are input / output in the optical cross-connect device 10, client signals input from K Add ports are connected to K input ports of the optical switch 12 (K is an integer of 1 or more). The optical switch 12 cross-connects these (N × M + K) optical signals and outputs them to (N × M + K) output ports. Among these, (N × M) optical signals are wavelength-multiplexed by N optical signals by the optical wavelength multiplexer 13 and output to M optical fiber transmission lines, respectively, and K client signals are Output to the Drop port.

  The optical signals that are wavelength-multiplexed by the optical wavelength multiplexer 13 need to have different wavelengths, while the wavelength bands used for wavelength-division multiplexing in each optical fiber transmission line are generally common. For this reason, optical signals of the same wavelength input from different optical fiber transmission lines may be input to the optical wavelength multiplexer 13. In such a case, a wavelength converter is provided in a part or all of the input unit of the optical wavelength multiplexer 13, and when wavelength competition occurs, any wavelength is converted and then input to the optical wavelength multiplexer 13. The structure to be taken is taken.

  Here, an example of a path of a client signal input from the Add port of the optical cross-connect device 10-1 will be described with reference to FIG. This client signal is cross-connected by the optical switch 12 of the optical cross-connect device 10-1 (shown by a solid line in the figure), wavelength-multiplexed by the optical wavelength multiplexer 13 connected to the optical fiber transmission line 1, and optical fiber. The data is transmitted to the optical cross-connect device 10-2 via the transmission line 1. The client signal input and separated to the optical wavelength separator 11 of the optical cross-connect device 10-2 is cross-connected by the optical switch 12 and wavelength-multiplexed by the optical wavelength multiplexer 13 connected to the optical fiber transmission line 3. Then, it is transmitted to the optical cross-connect device 10-4 via the optical fiber transmission line 3. The client signal input and separated to the optical wavelength separator 11 of the optical cross-connect device 10-4 is cross-connected by the optical switch 12 and output from the drop port.

  In this optical network system, when the path of the optical fiber transmission paths 1 and 3 for transmitting the client signal is changed to the path of the optical fiber transmission paths 2 and 4, the optical cross-connect devices 10-1, 10-3, 10 -4 optical switches 12 may be set as indicated by broken lines.

  In such an optical cross-connect device, it is common to have a plurality of optical switches in advance in preparation for failure of the optical switch, with one as the active and the other as a spare. FIG. 11 shows a configuration example of a conventional optical cross-connect device that switches between active and standby. In this configuration example, the input optical signals 1 to (N × M) separated by the optical wavelength separator 11 connected to the input optical fiber transmission lines 1 to M, respectively, and K input ports are input. Each of the input optical signals (N × M + 1) to (N × M + K) is branched into two by the optical coupler 14, one of which is input to each input port of the active optical switch 12-1, and the other is a spare. Input to each input port of the optical switch 12-2. One of the two output optical signals output from the paired output ports of the optical switches 12-1 and 12-2 is selected by the optical switch 15, and output optical signals 1 to (N × M) are output. Output as optical signals (N × M + 1) to (N × M + K). Output optical signals 1 to (N × M) are wavelength-multiplexed by N by an optical wavelength multiplexer 13 connected to output optical fiber transmission lines 1 to M, and output optical signals (N × M + 1) to (N × M + K) is output from K Drop ports.

  Here, the optical switch 15 selects the output if the working optical switch 12-1 is normal among the optical switches 12-1 and 12-2, and reserves the working if the working optical switch 12-1 fails. The output of the optical switch 12-2 is selected. It is also possible to use an optical switch instead of the optical coupler 14. In this case, it is desirable to switch the input-side optical switch and the output-side optical switch 15 in synchronization.

Further, an optical coupler 14 (or an optical switch) may be disposed on the input side of the optical wavelength separator 11, and an optical switch 15 may be disposed on the output side of the optical wavelength multiplexer 13. The optical wavelength separator 11 is disposed on the input side of the optical switch 12-2, and the optical wavelength multiplexer 13 is disposed on the output side.
JP-A-6-292246

  By the way, in the configuration of the optical cross-connect device shown in FIG. 11, the reliability of the optical cross-connect device and the optical network system can be improved by duplicating the optical switch and switching to the spare optical switch when the current optical switch fails. It is configured to increase.

  On the other hand, as shown in FIG. 10, the optical network system can be switched to the other optical fiber transmission path 2 or 4 when a failure occurs in the optical fiber transmission path 1 or 3, for example. It is a configuration. However, a duplex configuration of optical fiber transmission lines that transmit the same optical signal in parallel through different paths is effective for switching paths without instantaneous interruption. That is, the optical signal is split into two on the transmission side and sent in parallel to different optical fiber transmission lines. When one optical fiber transmission line is faulty, it is transmitted via the other optical fiber transmission line. In this configuration, an optical signal is selected on the receiving side.

  However, although the optical cross-connect device as shown in FIG. 11 supports duplexing of optical switches, it cannot cope with duplexing of optical fiber transmission lines as it is. For example, in the optical cross-connect device on the transmission side, the optical switch 15 is configured to select each output of the optical switches 12-1 and 12-2 on a two-to-one basis, and an optical signal is connected in parallel to the duplexed optical fiber transmission line. Cannot be sent. Therefore, when the output of the optical switch 15 is branched into two by an optical coupler or the like, and the same optical signal is sent in parallel to the duplexed optical fiber transmission line, the optical signal is always fixed to the duplexed optical fiber transmission line. It is not convenient because it occupies the transmission path and cannot be stopped if necessary.

  Also in the optical cross-connect device on the receiving side, in the configuration using the optical coupler 14 (or optical switch) on each input side of the optical switches 12-1 and 12-2, the same input from the duplexed optical fiber transmission line is performed. One of the optical signals cannot be selected.

  As described above, in order to cope with both the duplexing of the optical switch and the duplexing of the optical fiber transmission line, it is necessary to change the configuration of the optical coupler and the optical switch of the optical cross-connect device.

  An object of the present invention is to provide an optical cross-connect device that can flexibly cope with redundancy of an optical switch for switching optical signal paths and redundancy of a transmission path with a simple configuration.

The first invention has a plurality of input ports and a plurality of output ports, and each of the first optical switch and the second optical switch that arbitrarily connect between the input and output ports, and a plurality of input optical signals, respectively. and are outputted a plurality of one-input, two-output optical branching means for connecting to a first of the input ports of the optical switch and the second optical switch, the output port of the first optical switch and a second optical switch In an optical cross-connect device comprising a plurality of 2-input 1-output optical switching means for inputting a branched optical signal by a 1-input 2-output optical branching means and selecting one of them to output as an output optical signal. For some or all of the input 1 output light switching means, an optical signal output from the output port of each of the first optical switch and the second optical switch is input, and one of them is selected and output. And de, replacing the 2 input 2 output optical switching means having a mode for outputting the optical signals in parallel.

  In the first invention, the two output optical signals output in parallel from the two-input / two-output optical switching means may be sent to different transmission paths.

The second invention has a plurality of input ports and a plurality of output ports, and each of the first optical switch and the second optical switch that arbitrarily connect the input / output ports, and a plurality of input optical signals, respectively. and are outputted a plurality of one-input, two-output optical branching means for connecting to a first of the input ports of the optical switch and the second optical switch, the output port of the first optical switch and a second optical switch In an optical cross-connect device comprising a plurality of 2-input 1-output optical switching means for inputting a branched optical signal by a 1-input 2-output optical branching means and selecting one of them to output as an output optical signal. For some or all of the input two-output optical branching means, two input optical signals that are branched into two on the transmission side and transmitted via different transmission paths are input, and one of the input optical signals is converted into the first input optical signal. Light switch Or 2 having a mode to output to one of the input ports of the second optical switch, a mode to output the two input optical signals in parallel respectively to first input ports of the optical switch and the second optical switch Replace with input 2 output light switching means.

The third invention has a plurality of input ports and a plurality of output ports, and each of the first optical switch and the second optical switch that arbitrarily connect between the input and output ports, and a plurality of input optical signals, respectively. and are outputted a plurality of one-input, two-output optical branching means for connecting to a first of the input ports of the optical switch and the second optical switch, the output port of the first optical switch and a second optical switch In an optical cross-connect device comprising a plurality of 2-input 1-output optical switching means for inputting a branched optical signal by a 1-input 2-output optical branching means and selecting one of them to output as an output optical signal. For some or all of the input two-output optical branching means, two input optical signals that are branched into two on the transmission side and transmitted via different transmission paths are input, and one of the input optical signals is converted into the first input optical signal. Light switch Or the has a mode for outputting to one of the input ports of the second optical switch, a mode to output the two input optical signals in parallel respectively to first input ports of the optical switch and the second optical switch 1 is replaced with a 2-input 2-output light switching means, and the optical signals output from the output ports of the first optical switch and the second optical switch for some or all of the plurality of 2-input 1-output light switching means, respectively. It replaces with the 2nd 2 input 2 output optical switching means which has the mode which inputs and selects one of them and outputs, and the mode which outputs each optical signal in parallel.

In the third invention, the two output optical signals output in parallel from the second two-input / two-output optical switching means are converted into electric signals, the delay difference between the electric signals is adjusted, and one of them is selected. And selecting means for outputting the output.

  In the first invention, an optical wavelength separator is provided before or after the 1-input 2-output optical branching means, and optical wavelength multiplexing is provided before or after the 2-input 1-output optical switching means and the 2-input 2-output optical switching means. A vessel may be provided. In the second aspect of the invention, an optical wavelength separator is provided before or after the 1-input 2-output optical branching means and the 2-input 2-output optical switching means, and an optical wavelength multiplexer is provided before or after the 2-input 1-output optical switching means. You may prepare. In the third aspect of the invention, an optical wavelength separator is provided before or after the 1-input 2-output light branching means and the first 2-input 2-output light switching means, and the 2-input 1-output light switching means and the second 2-input 2 An optical wavelength multiplexer may be provided before or after the output light switching means.

  The optical cross-connect device according to the present invention has a two-input / two-output optical switching means arranged on the output side of the optical switch in a mode in which one of the two inputs is selected and output, with respect to the failure of one optical switch. The output of the optical switch can be selected. Furthermore, in the mode in which two-input optical signals are output in parallel, when the optical signals branched into two on the input side of the optical switch are output via the two optical switches, they are sent to the transmission paths of different paths as they are. Can be made.

  Also, the optical cross-connect device of the present invention is a two-input two-output optical switching means arranged on the input side of the optical switch, and is divided into two inputs on the transmission side and transmitted via transmission paths of different paths. In a mode in which one of the optical signals is selected and connected to one of the two optical switches, the other optical switch can be selected in response to the failure of one of the optical switches. Further, in a mode in which two-input optical signals are output to two optical switches in parallel, the optical signals can be directly transmitted from the output port of the optical switch to different transmission paths.

  As a result, an optical cross-connect device corresponding to both the redundant configuration of the optical switch and the redundant configuration of the transmission path can be realized. In other words, the optical cross-connect device of the present invention has a simple configuration and can realize a standby system configuration of the optical switch and the transmission path according to the operation state, and can perform an economical and stable operation, and the reliability of the optical network system. The operability can be increased and the operability can be improved.

(Embodiment of optical cross-connect device of the present invention)
FIG. 1 shows an embodiment of the optical cross-connect device of the present invention.
In the figure, the optical cross-connect devices 10-1 to 10-4 each have a working optical switch 12-1 and a spare optical switch 12-2. The optical network system including the optical cross-connect device of the present embodiment is similar to the configuration of the optical network system shown in FIGS. 9 and 10, and the optical cross-connect device 10-1 and the optical cross-connect devices 10-2 and 10-3. Are connected via optical fiber transmission lines 1 and 2, respectively, and optical cross-connect devices 10-2 and 10-3 and optical cross-connect device 10-4 are connected via optical fiber transmission lines 3 and 4, respectively.

  In the present embodiment, the optical cross-connect device 10-1 and the optical cross-connect device 10-3 are further connected via the redundant optical fiber transmission line 5, and the optical cross-connect device 10-3 and the optical cross-connect device 10- 4 is assumed to be connected via a redundant optical fiber transmission line 6. The optical cross-connect device 10-3 may be provided with ports corresponding to the redundant optical fiber transmission lines 5 and 6, similarly to the optical cross-connect devices 10-1 and 10-4.

  In the present invention, instead of the optical switch (15 in FIG. 11) on the output side of the optical switches 12-1 and 12-2 of the optical cross-connect device 10-1, a mode corresponding to switching between active and standby, and optical It is characterized by using an optical switch 16 capable of realizing a mode corresponding to duplexing of fiber transmission lines. Further, instead of the optical couplers (14 in FIG. 11) and the optical switch (15 in FIG. 11) on the output side of the optical switches 12-1 and 12-2 of the optical cross-connect devices 10-2 to 10-4. Thus, the optical switchers 17 and 18 capable of realizing a mode corresponding to switching between active and standby and a mode corresponding to duplexing of optical fiber transmission lines are used.

  Here, a mode corresponding to switching between active and standby and a mode corresponding to duplexing of optical fiber transmission lines will be described with reference to FIG. 2 and FIG.

  The optical switch 16 of the optical cross-connect device 10-1 includes the mode 1 for selecting the output of the active optical switch 12-1 shown in FIG. 2A and the spare optical switch 12- shown in FIG. Mode 2 for selecting the output of 2 and mode 3 for outputting the outputs of the optical switches 12-1 and 12-2 shown in FIG. 3A in parallel to the duplexed optical fiber transmission line. Mode 1 and mode 2 are modes in which the normal optical switch is selected with priority in use.

  The optical switch 17 on the input side of the optical switches 12-1 and 12-2 of the optical cross-connect device 10-4 selects and inputs the active optical switch 12-1 shown in FIG. 2 (d), which selects and inputs the spare optical switch 12-2, and the optical signals input in parallel from the duplexed optical fiber transmission lines shown in FIGS. 3 (b) to 3 (d), respectively. Mode 3 is input to the optical switches 12-1 and 12-2. The optical switch 18 on the output side of the optical switches 12-1 and 12-2 of the optical cross-connect devices 10-2 to 10-4 is the current optical switch 12- shown in FIGS. 2 (c) and 3 (b). Mode 1 for selecting the output of 1, mode 2 for selecting the output of the spare optical switch 12-2 shown in FIGS. 2 (d) and 3 (c), and the optical switch 12- shown in FIG. 3 (d). A mode 3 in which outputs 1 and 12-2 are output in parallel and one of them is selected in the subsequent stage is provided.

  As the optical switches 16, 17, and 18 that realize the above modes, for example, a spatial optical switch such as a MEMS optical switch can be used.

(Configuration example of optical cross-connect device 10-1)
FIG. 4 shows a configuration example of the optical cross-connect device 10-1 including the optical switch 16.
In the figure, a two-input two-output optical switch 16 is disposed between the optical switches 12-1 and 12-2 and the optical wavelength multiplexer 13 connected to the optical fiber transmission line 1, and the optical switch 16 Two inputs are connected to the output ports of the optical switches 12-1 and 12-2, respectively, one output of the optical switch 16 is connected to the optical wavelength multiplexer 13, and the other output is connected to a redundant optical fiber. Connected to the optical wavelength multiplexer 13 ′ connected to the transmission line 5. The optical switch 16 is configured to realize the modes 1 to 3 shown in FIGS. 2 (a), 2 (b) and 3 (a). Here, although the optical switch 16 is provided in all of the N optical signal paths for wavelength multiplexing, it is not always necessary to provide all of them, and the conventional optical switch 15 and the conventional optical switch 15 in units of a predetermined number of packages. The optical switch 16 in the invention may be mixed. The same applies to routes corresponding to other optical fiber transmission lines. A plurality of these optical switchers 16 may be combined to form a spatial light switch.

(Configuration example of optical cross-connect device 10-4)
FIG. 5 shows a configuration example of the optical cross-connect device 10-4 including the optical switchers 17 and 18.
In the figure, a two-input two-output optical switch 17 is arranged between the optical wavelength separator 11 connected to the optical fiber transmission line 3 and the optical switches 12-1 and 12-2. One input is connected to the optical wavelength separator 11, the other input is connected to the optical wavelength separator 11 'connected to the redundant optical fiber transmission line 6, and the two outputs of the optical switch 17 are respectively connected to the optical switch. It connects to the input port which becomes a pair of 12-1, 12-2. The optical switch 17 is configured to realize modes 1 to 3 shown in FIGS. 2 (c) and 2 (d) and FIGS. 3 (b) to 3 (d). Here, although the optical switch 17 is provided in all of the N optical signal paths for wavelength separation, it is not always necessary to provide all of them, and the conventional optical coupler 14 and the present invention are provided in units of a predetermined number of packages. The optical switch 17 may be mixed. The same applies to routes corresponding to other optical fiber transmission lines. A plurality of these optical switches 17 may be combined to form a spatial light switch.

  Further, a 2-input 2-output optical switch 18 is arranged between the optical switches 12-1, 12-2 and the drop port, and the two inputs of the optical switch 18 are connected to the optical switches 12-1, 12-2, respectively. And one output of the optical switch 18 is connected to the regular Drop port, and the other output is connected to the redundant Drop port. The optical switch 18 is configured to realize the modes 1 to 3 shown in FIGS. 3 (b) to 3 (d).

(Configuration example of optical cross-connect devices 10-2 and 10-3)
In the optical cross-connect devices 10-2 and 10-3, in order to correspond to the redundant optical fiber transmission lines 5 and 6, as shown in FIG. The optical switch 17 shown in FIG. 5 may be arranged, and the optical switch 16 shown in FIG. 4 may be arranged on the output side.

FIG. 7 shows a configuration example of a Drop port corresponding to modes 1 to 3 of the optical switch 18.
In the figure, two optical signals transmitted through different optical fiber transmission lines are output in parallel via optical switches 12-1 and 12-2, respectively. The two optical signals are photoelectrically converted by the photoelectric converters 21-1, 21-2, respectively, and the delay differences (phase differences) between the transmission lines are adjusted by the delay adjusters 22-1, 22-2. The selector 23 selectively outputs one of them.

  As a result, when one of the optical switches 12-1 and 12-2 or one of the duplexed optical fiber transmission lines has a failure, the optical switch 18 is set to mode 3, and the selector 23 operates normally. By selectively outputting a received signal, it is possible to switch without interruption without missing bits. When a failure occurs in one of the optical switches 12-1 and 12-2, the optical switch 18 is set to mode 1 or mode 2, and the selector 23 selects and outputs a normal received signal. Is possible.

(Another usage example of the optical cross-connect device of the present invention)
FIG. 8 shows another example of use of the optical cross-connect device of the present invention.
The optical cross-connect device according to the present invention has a configuration that can cope with duplexing of optical fiber transmission lines while accommodating duplexing of optical switches. Therefore, the optical switching device 16 has a configuration in which modes 1 to 3 can be set. Mode 3 of the optical switch 16 is a setting in which the same optical signal is sent in parallel to two optical fiber transmission lines, and a multicast transmission system as shown in FIG. 8 can be made using this function. That is, the optical cross-connect device 10-1 performs multicast transmission to the optical cross-connect devices 10-2 and 10-3 via the optical fiber transmission lines 1 and 5. Similarly, the same applies to the optical cross-connect devices 10-2, 10-3, and 10-4.

  In the optical cross-connect device described above, the optical switch 17 may be disposed on the input side of the optical wavelength separator 11, and the optical switch 16 may be disposed on the output side of the optical wavelength multiplexer 13. In this case, the optical wavelength separator 11 may be disposed on the input side of the spare optical switch 12-2, and the optical wavelength multiplexer 13 may be disposed on the output side.

The figure which shows embodiment of the optical cross-connect apparatus of this invention. The figure which shows the mode description 1 of an optical switch. The figure which shows the mode description 2 of an optical switch. The figure which shows the structural example of the optical cross-connect apparatus 10-1 containing the optical switch. The figure which shows the structural example of the optical cross-connect apparatus 10-4 containing the optical switchers 17 and 18. FIG. The figure which shows the structural example of the optical cross-connect apparatuses 10-2 and 10-3 containing the optical switchers 17 and 18. FIG. The figure which shows the structural example of the Drop port corresponding to the modes 1-3 of the optical switch. The figure which shows the other usage example of the optical cross-connect apparatus of this invention. The figure which shows the structural example of the optical network system containing an optical cross-connect apparatus. The figure which shows the example of the path | route of a client signal. The figure which shows the structural example of the conventional optical cross-connect apparatus.

Explanation of symbols

1, 2, 3, 4, 5, 6 Optical fiber transmission line 11 Optical wavelength separator 12 Optical switch 13 Optical wavelength multiplexer 14 Optical coupler 15 Optical switch 16, 17, 18 Optical switch 21 Photoelectric converter 22 Delay Adjuster 23 Selector

Claims (8)

A first optical switch and a second optical switch, each having a plurality of input ports and a plurality of output ports, arbitrarily connecting between the input and output ports;
A plurality of 1-input 2-output optical branching means for branching a plurality of input optical signals, respectively, and connecting to each input port of the first optical switch and the second optical switch;
A branched optical signal is input by the 1-input 2-output optical branching means output from the output ports of the first optical switch and the second optical switch, respectively, and one of them is selected and output as an output optical signal In an optical cross-connect device comprising a plurality of 2-input 1-output light switching means,
For some or all of the plurality of two-input one-output optical switching means, input optical signals output from the output ports of the first optical switch and the second optical switch, respectively, and select one of them. An optical cross-connect device characterized in that it is replaced with a 2-input 2-output optical switching means having a mode for outputting and a mode for outputting each optical signal in parallel. The optical cross-connect device according to claim 1,
An optical cross-connect device, wherein the two output optical signals output in parallel from the two-input / two-output optical switching means are respectively sent to different transmission paths. A first optical switch and a second optical switch, each having a plurality of input ports and a plurality of output ports, arbitrarily connecting between the input and output ports;
A plurality of 1-input 2-output optical branching means for branching a plurality of input optical signals, respectively, and connecting to each input port of the first optical switch and the second optical switch;
A branched optical signal is input by the 1-input 2-output optical branching means output from the output ports of the first optical switch and the second optical switch, respectively, and one of them is selected and output as an output optical signal In an optical cross-connect device comprising a plurality of 2-input 1-output light switching means,
For some or all of the plurality of one-input two-output optical branching means, two input optical signals that are branched into two on the transmission side and transmitted via different transmission paths are input, and one of the input optical signals is input Output to one of the input ports of the first optical switch or the second optical switch, and the two input optical signals to the inputs of the first optical switch and the second optical switch. An optical cross-connect device characterized in that it is replaced with 2-input 2-output optical switching means having a mode of outputting in parallel to the ports. A first optical switch and a second optical switch, each having a plurality of input ports and a plurality of output ports, arbitrarily connecting between the input and output ports;
A plurality of 1-input 2-output optical branching means for branching a plurality of input optical signals, respectively, and connecting to each input port of the first optical switch and the second optical switch;
A branched optical signal is input by the 1-input 2-output optical branching means output from the output ports of the first optical switch and the second optical switch, respectively, and one of them is selected and output as an output optical signal In an optical cross-connect device comprising a plurality of 2-input 1-output light switching means,
For some or all of the plurality of one-input two-output optical branching means, two input optical signals that are branched into two on the transmission side and transmitted via different transmission paths are input, and one of the input optical signals is input Output to one of the input ports of the first optical switch or the second optical switch, and the two input optical signals to the inputs of the first optical switch and the second optical switch. Replacing the first 2-input 2-output light switching means having a mode of outputting in parallel to the ports,
For some or all of the plurality of two-input one-output optical switching means, input optical signals output from the output ports of the first optical switch and the second optical switch, respectively, and select one of them. An optical cross-connect device characterized by being replaced with a second 2-input 2-output light switching means having a mode for outputting and a mode for outputting each optical signal in parallel. The optical cross-connect device according to claim 4,
Selection means for converting two output optical signals output in parallel from the second two-input / two-output light switching means into electric signals, adjusting a delay difference between the electric signals, and selecting and outputting one of them. An optical cross-connect device comprising: The optical cross-connect device according to claim 1,
An optical wavelength separator is provided upstream or downstream of the 1-input 2-output optical branching means, and an optical wavelength multiplexer is provided upstream or downstream of the 2-input 2-output optical switching means and the 2-input 2-output optical switching means. An optical cross-connect device. The optical cross-connect device according to claim 3,
An optical wavelength separator is provided before or after the 1-input 2-output optical branching means and the 2-input 2-output optical switching means, and an optical wavelength multiplexer is provided before or after the 2-input 1-output optical switching means. An optical cross-connect device. The optical cross-connect device according to claim 4,
An optical wavelength separator is provided before or after the 1-input 2-output light branching means and the first 2-input 2-output light switching means, and the 2-input 1-output light switching means and the second 2-input 2-output light are provided. An optical cross-connect device comprising an optical wavelength multiplexer before or after the switching means.

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