JP4807198B2 - Optical cross-connect device, optical cross-connect method, and program - Google Patents

Description

  The present invention relates to an optical cross-connect device used for optical path switching in the field of optical communication, and more particularly to an optical cross-connect device, an optical cross-connect method, and a program that improve the uniformity of insertion loss between ports.

  An optical cross-connect device that aims to improve the uniformity of insertion loss of each optical path is disclosed in Patent Document 1. This conventional optical cross-connect device is arranged between an N × M matrix optical switch having N optical input ports and M optical output ports, and between the N × M matrix optical switch and each optical output port. A variable optical attenuator, a setting value table for storing optical attenuation amounts corresponding to N × M paths in association with path numbers, and a control means for searching the setting value table and extracting a desired optical attenuation amount And when the optical path switching instruction is input from the outside, the control means extracts the optical attenuation amount corresponding to the path number included in the optical path switching instruction from the setting value table and outputs it to the variable optical attenuator. Thus, the output light can be attenuated to a desired attenuation value, and as a result, the uniformity of insertion loss can be improved.

Japanese Patent Laid-Open No. 2004-364042 (first page, FIG. 1)

  The conventional optical cross-connect device disclosed in Patent Document 1 requires M external variable optical attenuators corresponding to the number of optical output ports M of the optical switch. There is a problem that the hardware scale becomes large and the cost of the apparatus becomes high.

  The present invention has been made to solve the above-described problems, and has an object to provide a small-sized optical cross-connect device with a small number of components while improving the uniformity of insertion loss of each optical path. Yes.

The optical cross-connect device according to the present invention includes an optical input port, an optical output port, and a MEMS (Micro Electric Mechanical System) mirror, and the optical input port and the optical output port are arranged in an optical path passing through the MEMS mirror. An optical switch that cross-connects between them , an interface unit that receives control information including a prescribed value of the input light level of the device connected to the self-optical cross-connect device, and setting of insertion loss of each optical path stored in the setting value table The information corresponding to the value is compared with the control information by the interface unit, and within the range of the specified value of the input light level, the switching of the optical path of the optical switch and the variation in the insertion loss of each optical path due to this switching Control for controlling the position of each MEMS mirror so that the When, those having a.

The present invention can provide a small optical cross-connect device with a small number of parts while improving the uniformity of insertion loss of each optical path, and automatically generates a loss suitable for the device to be connected. is, Ru can avoid input of the optical signal of an excessive light intensity.

Embodiment 1 FIG.
The optical cross-connect device according to the first embodiment of the present invention has a variable attenuation function by shifting the position of the MEMS mirror inside the N × M matrix type optical switch, and switches each optical path and inserts each optical path. Since the position of each MEMS mirror is controlled so that the variation in insertion loss is reduced with reference to the setting value table storing the loss information, the uniformity of the insertion loss in each optical path is improved. The number of parts is small and the size can be reduced.

  1 is a block diagram showing an optical cross-connect device according to Embodiment 1 of the present invention. In FIG. 1, when the optical cross-connect device 1 acquires an optical path switching instruction signal from the outside via a control communication input / output line, the optical cross-connect device 1 extracts a switching mirror number from the optical path switching instruction signal, and switches the optical path. A control unit 11 that generates a control signal, N (N is a natural number of 2 or more) optical input ports 21a, M (M is a natural number of 2 or more) optical output ports 21b, and N × M MEMS (Micro) An N × M matrix type optical switch 12 that switches the designated mirror among the N × M MEMS mirrors 22 when it receives a control signal from the control unit 11 and is an optical switch having an electrical mechanical system) mirror 22. And. FIG. 1 shows a case where N = 3 and M = 3, but the present invention is not limited to this.

  FIG. 2 is a block diagram showing an optical cross-connect device according to Embodiment 1 of the present invention, and shows an example of a specific configuration of an N × M (here, 3 × 3) matrix type optical switch 12. . In FIG. 2, when an optical path switching instruction is input from the outside, the matrix type optical switch 12 turns on an actuator that drives the MEMS mirror 22 to establish a desired optical path, and light is transmitted through the MEMS mirror 22. The input port 21a and the optical output port 21b are connected. As a result, the light propagating through the optical input port 21a as the optical fiber is collimated by the collimating lens 20 of the optical input port, reflected by the MEMS mirror 22, and the optical output as the optical fiber by the collimating lens 20 of the optical output port. Coupled to port 21b.

  Here, manufacturing variations in optical characteristics of the collimating lens 20 and the MEMS mirror 22 and manufacturing variations in the process of aligning and connecting the collimating lens 20 and the MEMS mirror 22 cause variations in optical path loss. In addition, since the light emitted from the collimating lens 20 is not ideal collimated light (parallel light), the distance from the collimating lens 20 on the input side to the MEMS mirror 22 and the distance from the MEMS mirror 22 to the collimating lens 20 on the output side. The difference in distance also causes variations in optical path loss.

  FIG. 3 is an explanatory diagram for explaining the optical cross-connect device according to the first embodiment of the present invention. In FIG. 3, an optical signal from an optical input port 21a as an optical fiber is reflected in the MEMS mirror 22 after entering the free space. At this time, the maximum power of the reflected light is input to a desired light output port 20b as an optical fiber by optimally controlling the reflection angle of the MEMS mirror 22. As shown in FIG. 2, an optical component such as a lens for appropriately collecting light, for example, a collimating lens 20, is provided between the optical input ports 21 a and 21 b as optical fibers and the MEMS mirror 22. Also good.

  FIG. 4 is a configuration diagram showing the optical cross-connect device according to Embodiment 1 of the present invention, and shows a specific configuration of the MEMS mirror 22. In FIG. 4, the MEMS mirror 22 has a structure that can freely change the angle in the X-axis and Y-axis directions. The reflected light is input to the desired light output port 21b by controlling the angle of the mirror appropriately in the X-axis and Y-axis directions using an actuator not shown.

  FIG. 5 is an explanatory diagram for explaining an optical cross-connect device according to Embodiment 1 of the present invention. In FIG. 5, the horizontal axis represents the angle of the MEMS mirror 22, and the vertical axis represents the light intensity of the reflected light input to the light output port 21b. This light intensity becomes maximum when the angle of the mirror becomes an optimum value, and the insertion loss value in the optical path of the optical switch at this time becomes minimum. Here, it can be seen that an arbitrary loss can be given by controlling the angle to be shifted from the optimum value of the angle.

  As described above, by controlling the position of the MEMS mirror 22 as coarse adjustment so that the reflected light is input to the desired light output port 21b, the optical path can be switched and the optical position can be shifted from the optimum position. By controlling the position of the MEMS mirror 22 as fine adjustment, a desired loss value can be generated in the optical path.

  Since it is possible to intentionally generate an arbitrary loss by controlling the MEMS mirror 22 in this way, all combinations of the optical input port 21a and the optical output port 21b are utilized by utilizing this action. For example, by controlling the position of each MEMS mirror 22 individually so that the output power of all the combinations becomes a constant value in accordance with the maximum loss value, for example, by having the loss value of the optical path for The light intensity output from each light output port 21b can be attenuated so as to be uniform.

  In FIG. 1, the control unit 11 is provided with a memory for previously having loss values of combinations of all the optical input ports 21 a and optical output ports 21 b as data. In the memory, a set value table 31 and a control program for controlling the set value table 31 are stored. The control program decodes the optical path switching instruction inputted from the outside via the control communication input / output line, extracts the optical path number, and outputs the optical path number to the N × M matrix type optical switch 12, Based on the optical path number, the set value table 31 is searched, control information necessary for obtaining the detected light attenuation amount is calculated, and processing for controlling each MEMS mirror 22 is performed.

  FIG. 6 is an explanatory diagram for explaining the optical cross-connect device according to the first embodiment of the present invention, and is a table showing a specific example of the contents of the setting value table 31 built in the control unit 11. In FIG. 6, the set value table 31 is obtained by converting the “loss value” of each of the N × M optical paths measured in advance into data in association with the “optical path number” for each path. It is stored in the memory. The “input port number−output port number” column of the setting value table 31 indicates the optical input port number (for example, input 1) and the optical output port number (for example, output 1) of the N × M matrix type optical switch 12. In the “loss value” column, the loss value of the light propagating through this path is described.

  When the attenuation value to be set for each MEMS mirror 22 is used instead of the “loss value” column of the setting value table 31, each described attenuation amount is the most of the N × M optical paths. Using a path with a large insertion loss as a reference, the difference between the maximum insertion loss and the insertion loss of another path is obtained as a “corrected light attenuation amount”. The loss value or the correction light attenuation amount is measured in advance and stored in a medium such as a nonvolatile memory, a ROM (Read Only Memory), or a hard disk.

  In FIG. 6, the N × M matrix optical switch 12 has 3 optical input ports, 3 optical output ports, and a 3 × 3 matrix optical switch with a total of 9 routes. Shows the case.

  Next, the operation will be described in detail. The control unit 11 of the optical cross-connect device 1 having the above-described configuration first receives an optical path switching instruction from the control communication input line, decodes the optical path switching instruction, and switches the optical input port number and optical output port number to be switched. An optical path number corresponding to is obtained. Next, the control unit 11 outputs this optical path number to the matrix type optical switch 12, and the matrix type optical switch 12 controls the position by turning on the switch of the MEMS mirror 22 corresponding to the optical path number. Establishing. On the other hand, the control unit 11 refers to the setting value table 31, searches for data including the optical path based on the optical path number, extracts a loss value or an attenuation to be set from the detected data, The control information of the corresponding MEMS mirror 22 is obtained. Next, the matrix type optical switch 12 can attenuate the light output from the light output port 21b to a predetermined attenuation value by receiving the control information from the control unit 11 and controlling the position of the MEMS mirror 22. .

  For example, when the control unit 11 obtains an optical path switching instruction to switch to “input 1-output 3, input 2-output 1, input 3-output 2” via the control communication input line, the control unit 11 first causes the matrix optical switch 12 to The optical path number “3, 4, 8” is output, and each MEMS mirror 22 between “input 1-output 3, input 2-output 1, input 3-output 2” is turned on to establish each optical path. I do. Next, with reference to the set value table 31, the attenuation amount to be set for each MEMS mirror 22 corresponding to “input 1 -output 3, input 2 -output 1, input 3 -output 2” is extracted, and the attenuation amount The position control of the MEMS mirror 22 corresponding to is performed. Here, since the loss value of the optical path number “8” is the largest at 3.6 dB, the optical path number “3, 4” is attenuated so as to be approximately 3.6 dB, that is, insertion of each optical path is performed. Position control is performed so that variation in loss is reduced. Thereby, the light input from “input 1, input 2” can be attenuated to a desired light intensity and output to “output 3, output 1”, and the uniformity of insertion loss of each optical path can be improved. be able to.

  As described above, in the optical cross-connect device according to the first embodiment of the present invention, the control unit 11 stores the loss value corresponding to each optical path in advance in a database and stores it in the set value table 31. Since the optical path is switched and the position of each MEMS mirror 22 is controlled so that the variation in insertion loss of each optical path after switching is reduced, the uniformity of the insertion loss of each optical path is improved. Since an external variable optical attenuator is not required, the number of parts can be reduced and the size can be reduced.

Embodiment 2. FIG.
7 and 8 are explanatory diagrams for explaining an optical cross-connect device according to Embodiment 2 of the present invention. 7, the optical cross-connect device 1 according to the second embodiment has substantially the same configuration and control program as those of the first embodiment. However, when the angle control of the MEMS mirror 22 is performed, the monitor PD ( Photo Diode) 41 is different in that the light intensity at the light output port 21b is detected and the current value and voltage value applied to the actuator of the MEMS mirror 22 are controlled. At this time, rather than controlling the mirror so that the detected light intensity is maximized (that is, the optical loss value in the optical switch is minimized), the attenuation is arbitrarily given by making it slightly smaller than the maximum. .

  Next, a method for controlling the MEMS mirror will be described in detail. In FIG. 8, first, when a control signal is input from the control unit 11 to the current voltage controller 45 and set so as to give an attenuation amount to be set, a signal from the oscillator 43 is applied to the current voltage source 46 and a certain frequency is set. When only a minute width is modulated, the angle control of the MEMS mirror 22 operates in synchronism, and the mirror angle is also modulated by a minute width, whereby the light power in the optical output port 21b as an optical fiber is also minutely modulated.

  The minute power is branched by the optical coupler 42, and the optical power in the output optical fiber is constantly monitored by the monitor PD 41, but this optical level is controlled to be maximized. The light level in the output optical fiber changes even when it slightly deviates due to environmental conditions such as temperature and humidity in addition to MEMS mirror control. The phase of the light intensity change of the modulated signal and the optical signal detected by the monitor PD 41 at this time is compared in the synchronous detector 44 to determine which is shifted, and the control angle of the MEMS mirror 22 is determined by the current voltage controller 45. Control is performed via a current / voltage source 46. In this way, the angle of the MEMS mirror 22 can be set with high accuracy.

  FIG. 9 is an explanatory diagram for explaining an optical cross-connect device according to Embodiment 2 of the present invention. In the N × M matrix type optical switch, the control curve for feedback control is set to the right during mirror control. The movement to generate an appropriate loss by shifting to the shoulder or left shoulder is shown. In FIG. 9, the horizontal axis represents the current voltage value in the current voltage controller 45, and the vertical axis represents the light intensity of the reflected light input to the light output port 21b. The light intensity becomes maximum when the current-voltage controlled mirror angle reaches an optimum value, and the insertion loss value in the optical switch at this time becomes minimum. Here, it can be seen that an arbitrary loss value can be intentionally given by controlling to a set value slightly shifted from the optimum value of the current voltage value.

  As described above, it is possible to intentionally generate an arbitrary loss by controlling the MEMS mirror 22, and in the second embodiment, the current for controlling each MEMS mirror 22 is controlled by the arbitrary loss. Generated by appropriately controlling the voltage value.

  The monitor PD 41 and the optical coupler 42 are optical function units that are extremely highly integrated in the matrix optical switch of the three-dimensional MEMS system, and are not newly provided only for this function. On the other hand, the variable optical attenuator in Patent Document 1 is not provided inside the optical switch, but needs to be externally attached as an individual optical functional component, and therefore its cost increases.

  As described above, in the optical cross-connect device according to the second embodiment of the present invention, the control unit 11 stores the loss value corresponding to each optical path in advance in a database and stores it in the set value table 31. Since the optical path is switched and the feedback control of the position of each MEMS mirror based on the detection result of the light detection unit is performed so that the variation in insertion loss of each optical path after switching is reduced, the temperature is changed. Even if it is slightly deviated due to environmental conditions such as humidity, the insertion loss uniformity of each optical path can be improved, and an external variable optical attenuator is not required. Can be.

Embodiment 3 FIG.
FIG. 10 is an explanatory diagram for explaining an optical cross-connect device according to Embodiment 3 of the present invention, and is a table showing a specific example of the contents of the set value table 31a built in the control unit 11. In FIG. 10, the set value table 31a is obtained by converting the “attenuation amount” of each of the predetermined N × M optical paths into data in association with the “optical path number” for each path. It is stored in the memory. The “input port number−output port number” column of the setting value table 31a indicates the optical input port number (for example, input 1) and the optical output port number (for example, output 1) of the N × M matrix type optical switch 12. In the “attenuation amount” column, the set value of the attenuation amount to be given when the optical signal propagated through this path is output is described.

  In the first embodiment, the path and the loss value are stored in the set value table 31 for each “optical path number”, and the control program searches for the path, so that the attenuation amount of the path can be obtained. However, the second embodiment is different in that the attenuation value to be set is stored in the set value table 31a. Thereby, it is possible to simplify the process of searching for a route and obtaining the attenuation amount of the route.

  As described above, in the optical cross-connect device according to the third embodiment of the present invention, the uniformity of the insertion loss of each optical path can be improved as in the first embodiment, and the external variable optical attenuation can be achieved. Since the device is unnecessary, the number of components can be reduced and the size can be reduced, and the variable optical attenuation control process can be simplified.

Embodiment 4
FIG. 11 is a block diagram showing an optical cross-connect device according to Embodiment 4 of the present invention. In FIG. 11, the optical cross-connect device 1 a includes an LMP-WDM (Link Management Protocol-Wavelength Division Multiplexing) interface 13 serving as an interface unit that manages an interface with a WDM (Wavelength Division Multiplexing) device 2. The information of the optical interface type of the WDM device 2 connected via the unit and the information of the optical signal detection means are input as control information, and the optimum loss is automatically determined according to the connected optical interface type and the optical signal detection means. It is characterized by generating.

  Here, LMP-WDM is one of the GMPLS (Generalized Multi-Protocol Label Switching) protocols, and the LMP (Link Management Protocol) that performs resource management, alarm management function, etc. between optical cross-connect devices is used as an optical cross-connect device. And a protocol that has been extended to be applicable between WDM transmission apparatuses. GMPLS is a technique for routing signals on an optical network. In MPLS in an IP (Internet Protocol) router, a label is attached to a packet to specify a routing path. In GMPLS, a routing path is determined based on the wavelength of an optical signal, or a dedicated IP channel is prepared for control. Processing is performed such that actual data is routed as an optical signal.

  Next, the operation will be described. In FIG. 11, the optical cross-connect device 1 a has a function for exchanging control information with the WDM device 2 via the LMP-WDM 13. Needless to say, the WDM apparatus 2 is connected by an optical fiber separately from the exchange of control information, and transmits and receives an optical signal as a main signal. The output line of the optical cross-connect device 1a is connected to the optical input interface unit 14 of the WDM device 2 via an optical fiber. In particular, the input level of the optical input interface unit 14 of the WDM device 2 is strictly regulated. Therefore, it is necessary to avoid the input of an optical signal having an excessive light intensity. For example, the input light level to the WDM device 2 is defined as in the range of −5 dBm to −20 dBm, and in this case, it is not allowed in the system to input an optical signal of −5 dBm or more. Furthermore, it is desirable to make the input light level in the optical input interface unit 14 of the WDM device 2 as uniform as possible.

  In particular, in the optical communication field, in the metro area, etc., small- and medium-scale light used for switching optical paths when connecting to short- and medium-distance WDM devices that assume relatively short-distance connections. With regard to the cross-connect device, the transmission loss due to the optical fiber transmission line is small and the input light level is high, so that it is highly necessary to make the input light level uniform within a predetermined level range.

  An optical input interface unit by exchanging information with the WDM device 2 via the LMP-WDM 13 provided inside the optical cross-connect device 1a and in cooperation with the verification function of the LMP-WDM 13 in the WDM device 2. 14, information on the optical interface type and optical signal detection means of the WDM device 2 connected via the optical interface 14 is input, and the optical input of the connected WDM device 2 is input according to the connected optical interface type and optical signal detection means. The output interface characteristics, the specified value of the optical level, etc. are grasped and compared with the data stored in the memory etc. included in the optical cross-connect device 1a, and the optimum loss is automatically determined by the optical cross-connect device 1a. Generated internally.

  As described above, in the optical cross-connect device according to the fourth embodiment of the present invention, the loss value corresponding to each optical path is stored in the setting value table 31 in advance in the control unit 11 and stored in the set value table 31. The information of the optical interface type and optical signal detection means of the WDM device 2 is input via the LMP-WDM 13 that manages the interface of the optical signal, and the control unit 11 receives the optical signal according to the connected optical interface type and optical signal detection means. The position of each MEMS mirror is controlled so that the variation of the insertion loss of each optical path after switching is reduced and the uniformity of the insertion loss of each optical path is improved. Since there is no need for an external variable optical attenuator, the number of parts can be reduced, and the loss suitable for the connected device can be reduced. It can be automatically generated.

Embodiment 5 FIG.
In the fourth embodiment, the case where the optical cross-connect device and the WDM device are connected is shown. However, the fifth embodiment is different in that a device other than the WDM device such as a router is connected.

  FIG. 12 is a block diagram showing an optical cross-connect device according to Embodiment 5 of the present invention. In FIG. 12, an optical cross-connect device 1b includes an LMP (Link Management Protocol) 15 as an interface unit that manages an interface with the router device 3, for example, and is connected via this interface unit. The optical interface type and optical signal detection means information are input as control information, and an optimum loss is automatically generated according to the connected optical interface type and optical signal detection means. Note that LMP is one of the GMPLS protocols, and is a protocol that performs resource management, alarm management functions, and the like between optical cross-connect devices.

  Next, the operation will be described. In FIG. 12, the optical cross-connect device 1b according to Embodiment 5 of the present invention has a function for exchanging control information with the router device 3 via the LMP 15. Needless to say, the router device 3 is connected with an optical fiber separately from the exchange of control information, and transmits and receives an optical signal as a main signal. The output line of the optical cross-connect device 1b is connected to the optical input interface unit 14 of the router device 3 via an optical fiber. In particular, the input level of the optical input interface unit 14 of the router device 3 is strictly regulated. As in the case of the WDM apparatus 2, it is necessary to avoid the input of an optical signal having an excessive light intensity. For example, the input light level to the router device 3 is defined as in the range of −5 dBm to −20 dBm, and in this case, it is not allowed in the system to input an optical signal of −5 dBm or more. Furthermore, it is desirable to make the input light level in the optical input interface unit 14 of the router device 3 as uniform as possible.

  Small / medium-scale optical crossover used for switching optical paths when connecting to short / medium-distance routers that comply with interface standards for connection to other devices at relatively short distances Regarding the connection device, since the transmission loss due to the optical fiber transmission line is small and the input light level is high, the input light level is highly required to be uniform within a predetermined level range.

  Information is exchanged with the router device 3 via the LMP 15 provided inside the optical cross-connect device 1b, and the function of the LMP 15 in the router device 3 allows the light of the connected router device 3 to be connected according to the connected interface. The optical cross-connect device automatically determines the optimum loss by grasping the input / output interface characteristics, the prescribed value of the optical level, etc., and comparing it with the data stored in the memory etc. in the optical cross-connect device 1b. Generated internally.

  As described above, in the optical cross-connect device according to the fifth embodiment of the present invention, the attenuation amount corresponding to each optical path is stored in the setting value table 31 in the control unit 11 in advance, and stored in the router 3. The information of the optical interface type and the optical signal detection means of the router device 3 is input via the LMP 15 that manages the interface of the optical device, and the control unit 11 determines the optical path according to the connected optical interface type and the optical signal detection means. Since switching is performed and the position of each MEMS mirror is controlled so that the variation in insertion loss of each optical path after switching is reduced, the uniformity of the insertion loss of each optical path is improved. Since there is no need for an external variable optical attenuator, the number of parts can be reduced, and the loss suitable for the connected device can be automatically reduced. It can be generated.

The block diagram which shows the optical cross-connect apparatus by Embodiment 1 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 1 of this invention The block diagram which shows the optical cross-connect apparatus by Embodiment 1 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 1 of this invention The block diagram which shows the optical cross-connect apparatus by Embodiment 1 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 1 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 2 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 2 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 2 of this invention Explanatory drawing for demonstrating the optical cross-connect apparatus by Embodiment 3 of this invention Configuration diagram showing an optical cross-connect device according to Embodiment 4 of the present invention Configuration diagram showing an optical cross-connect device according to Embodiment 5 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b Optical cross-connect apparatus 2 WDM apparatus 3 Router apparatus 11 Control part 12 Matrix type | mold optical switch 13 LMP-WDM (Link Management Protocol-Wavelength Division Multiplexing)
15 LMP (Link Management Protocol)
21a Optical input port 21b Optical output port 22 MEMS (Micro Electric Mechanical System) mirror 31, 31a Setting value table 41 Monitor PD (Photo Diode)

Claims (6)

An optical switch having an optical input port, an optical output port, and a MEMS (Micro Electric Mechanical System) mirror, and cross-connecting between each optical input port and each optical output port through an optical path passing through the MEMS mirror;
An interface unit that receives control information including a prescribed value of an input light level of a device connected to the self-light cross-connect device;
By comparing the information corresponding to the set value of the insertion loss of each optical path stored in the set value table with the control information by the interface unit , the optical path of the optical switch is within the range of the specified value of the input light level. And a control unit for controlling the position of each MEMS mirror so that variation in insertion loss of each optical path due to this switching is reduced.
An optical cross-connect device comprising: The optical switch has a light detection unit that detects light intensity at the light output port;
The control unit controls the positions of the MEMS mirrors so as to switch the optical path of the optical switch, and also reduces the variation in insertion loss of each optical path due to the switching. The optical cross-connect device according to claim 1, wherein feedback control of a position of each MEMS mirror based on a detection result is performed.   The interface unit is LMP-WDM (Link Management Protocol-Wavelength Division Multiplexing) that receives control information including a prescribed value of an input light level of a WDM (Wavelength Division Multiplexing) device connected to the self-optical cross-connect device. The optical cross-connect device according to claim 1 or 2.   The said interface part is LMP (Link Management Protocol) which receives the control information containing the regulation value of the input light level of the router apparatus connected with the self-light cross-connect apparatus, The Claim 1 or Claim 2 characterized by the above-mentioned. Optical cross-connect equipment. In an optical cross-connect device including an optical switch having an optical input port, an optical output port, and a MEMS mirror, an optical cross that cross connects the optical input port and the optical output port through an optical path through the MEMS mirror. A connection method,
An interface step for receiving control information including a prescribed value of an input light level of a device connected to the self-light cross-connect device;
By comparing the information corresponding to the set value of the insertion loss of each optical path stored in the set value table with the control information by the interface step , the optical path of the optical switch is within the range of the specified value of the input light level. And a control step for controlling the position of each MEMS mirror so that variation in insertion loss of each optical path due to this switching is reduced.
An optical cross-connect method comprising:   A program for causing an electronic computer to execute the optical cross-connect method according to claim 5.

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