JP4046510B2 - Optical signal switching device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical signal switching device used for optical communication.
[0002]
[Prior art]
Optical transmission systems have been widely introduced as transmission paths in data communications represented by the Internet in recent years. This optical transmission system includes an optical fiber used for a transmission path and various devices including an optical device. In an optical transmission system, a large amount of data is transmitted using a single optical fiber, so that when a failure occurs in the transmission path, the effect is enormous. For this reason, the optical transmission system is required to have a high degree of reliability, and has a standby system that performs preliminary optical transmission when a failure occurs. Conventionally, switching to a standby system by an electrical signal has been performed, and switching from the standby system to the optical transmission path body has been performed in accordance with the failure recovery of the optical transmission path body.
[0003]
As a device for realizing high reliability of an optical transmission system, there is an optical signal path switching device, that is, an optical switch. The optical switch performs the switching at the time of failure recovery or the like by processing the part that has been conventionally processed by the electrical signal such as switching to the standby system without changing the optical signal. By introducing such an optical switch, the network of the optical transmission system is simplified, and various devices used in the optical transmission system can be miniaturized and the economy can be improved.
[0004]
In the above optical transmission system, a device consisting of an optical signal monitor, an optical switch, and a control unit is used, and the optical switch is switched by using the optical signal input interruption detected by the optical signal monitor as a trigger. Perform recovery operation.
[0005]
FIG. 8 is a perspective view showing an optical waveguide device including a conventional optical switch. The optical switch 111 is provided for the optical waveguide 105 of the film-like polymer 102 that is a waveguide housing sheet pressed by the presser plate 103. FIG. 9 shows a four-row, four-column matrix switch in which four incident optical fibers 121 and four outgoing optical fibers 122 are respectively connected to a waveguide 105. It is a figure which shows the optical signal switching apparatus which made the optical switch a passage state. The passing state and the reflecting state of these optical switches are configured by the following mechanism, for example.
[0006]
As shown in FIG. 10, in the optical connection ON state (hereinafter referred to as ON state) in which the drive mechanism (push rod) 106 is not pushed at the waveguide crossing portion, the waveguide housing sheet 102 has the cut end surface 102a at the cut portion. It is in close contact. Therefore, the core which is the waveguide 105 is also in close contact with the cut portion. For this reason, the light that reaches the close cut portion passes through the cut portion as it is.
[0007]
On the other hand, in the optical connection off state (hereinafter referred to as the off state) in which the push rod 106 is pushed, as shown in FIG. 11, the push rod 106 spreads and separates the cut end surface 102a from one side, thereby forming the cut end surface. In contact with air. For this reason, the light propagating through the waveguide having a high refractive index cannot be emitted from the cut end face, and is totally reflected by the air layer in the gap 109 and propagates while changing the traveling direction of the light by approximately 90 °.
[0008]
According to the above mechanism, in FIG. 8, when the optical connection at the waveguide intersection is in the ON state, the optical inputs L1 and L2 continuously pass through the portion where the cut end face 102a of the waveguide intersection 111 is in close contact. I'm going through. On the other hand, when the optical connection at the waveguide intersection is in the OFF state, the input lights L1 and L2 are both totally reflected by the optical switch, and output in a predetermined direction with the traveling direction changed by approximately 90 °. Go. As described above, the feature of the conventional optical switch is that the destination of light is switched by pushing and pulling one push rod 106.
[0009]
As described above, FIG. 9 shows an example of a 4 × 4 matrix type optical signal switching device including four input signal waveguides and four output signal waveguides. At the intersection between the input signal waveguide and the output signal waveguide, an optical switch for determining whether light goes straight as it is or whether the light path is changed by 90 degrees is arranged. In FIG. 9, a circle with a cross mark represents a straight traveling state, and a circle with two diagonal lines represents a course change state. Therefore, in the state of the optical switch shown in FIG. 9, IN-1 is output to OUT-4, IN-2 is output to OUT-3, IN-3 is output to OUT-2, and IN-4 is output to OUT-1. It shows the case of selecting as follows. The switching operation of the optical switch can be performed using the piezoelectric actuator of the pressing member shown in FIGS.
[0010]
In FIG. 9, for example, an optical signal incident on IN-4 is reflected by a (4, 1) optical switch and emitted to OUT-1. On the other hand, the optical signal incident on IN-1 passes through the optical switches (1, 1), (1, 2), and (1, 3), is reflected by (1, 4), and is reflected by the optical switch (2, 4), (3, 4) and (4, 4) are passed through and output to OUT-4.
[0011]
[Problems to be solved by the invention]
However, the matrix type optical signal switching device shown in FIG. 9 has a problem that the amount of light varies depending on the route through which the optical signal passes. For example, in the case of FIG. 9, when the route from IN-4 to OUT-1 is compared with the route from IN-1 to OUT-4, the optical path is long and the number of optical switches passing therethrough is large. In an optical switch, even if the cut portion is in close contact and is in a straight traveling state, it is not a completely continuous waveguide. Therefore, it is inevitable that a loss occurs even in a minute amount. For this reason, the light quantity of the optical signal output from OUT-4 is low due to the transmission loss of the waveguide and the loss of the optical switch.
[0012]
An object of the present invention is to provide an optical signal switching device capable of outputting an optical signal with little variation in light amount regardless of the path of the optical signal.
[0013]
[Means for Solving the Problems]
The optical signal switching device of the present invention has a plurality of input waveguides and a plurality of output waveguides, and each optical signal input to the input waveguide at the intersection of the input waveguide and the output waveguide. This is an optical signal switching device that switches the path of the optical signal and outputs an optical signal to the output waveguide. The optical signal switching device includes an optical switch that is arranged at an intersection and switches the path of the optical signal, a switch state control unit that forms an optical signal that is output by controlling the state of the optical switch, and an optical signal that is output An output intensity adjusting unit that adjusts the intensity of the optical waveguide, and the input waveguide and the output waveguide are arranged so as to intersect with each other in the waveguide housing sheet, and the optical switch includes the waveguide housing sheet at the intersecting portion. It includes a part where the waveguide is cut so as to cross the corner part, and an opening / closing control part for controlling opening / closing of the notch part, and the output intensity adjusting part includes the waveguide housing sheet. and encased portion, and a switching control section for controlling the opening and closing of the cut portion, switching control section for controlling the opening and closing of the cut portion of the output intensity adjusting unit changes the amount of light transmission in the slit portion Claim 1).
[0014]
With this configuration, an output optical signal with small intensity variation can be emitted. In addition, it is possible to easily emit the emitted light signal having the maximum intensity while suppressing variation within an allowable variation range.
[0015]
The optical signal switching device of the present invention includes an output intensity detection unit that detects the intensity of the output optical signal, and an intensity adjustment control unit that controls the output state of the output intensity adjustment unit based on the output intensity value. (Claim 2).
[0016]
Since the output intensity is adjusted based on the actually measured intensity of the output optical signal, variations in the output optical signal can be reliably suppressed.
[0017]
In the optical signal switching device of the present invention, the output intensity detector is provided in the output waveguide, and a demultiplexer that demultiplexes and propagates a predetermined proportion of the light propagating through the output waveguide; And a detector for detecting the intensity of light propagating through the branching filter (claim 3).
[0018]
With this configuration, for example, by demultiplexing about 1/10 of the amount of the emitted light, the intensity of the emitted light can be reliably aligned within a predetermined range without disturbing the emitted light.
[0019]
In the optical signal switching device of the present invention, based on the route determination unit that determines the route until the optical signal input to the input waveguide is output, and the route of the optical signal output to the output waveguide, The output light loss calculation unit for calculating the loss of the optical signal in the route, and the intensity of the output light via the route with a small output light loss amount so that the intensity of each output optical signal is aligned based on the output light loss amount. An intensity adjustment control unit that controls the state of the output intensity adjustment unit so as to reduce the output intensity adjustment unit can be provided.
[0020]
With this configuration, the loss of the optical signal can be predicted with considerable accuracy only from the optical signal route, so that the intensity variation of the output optical signal can be kept within a predetermined range with high accuracy as long as the waveguide and the optical switch are similarly manufactured uniformly. Can be suppressed.
[0021]
In the optical signal switching device of the present invention, the loss of the optical signal in each route can be calculated based on the number of optical switches in the route and the waveguide length of the route.
[0022]
According to this configuration, the loss amount can be sufficiently grasped to such an extent that no practical problem is caused, so that variations in the output optical signal can be suppressed without incorporating a measurement device.
[0023]
In the optical signal switching device of the present invention, an output intensity detection unit that detects the intensity of the output optical signal, an input intensity detection unit that detects the intensity of the input optical signal, the intensity of the output optical signal, and the input optical signal An intensity difference calculation unit that calculates a difference between the intensity and the intensity adjustment control unit that controls an output state of the output intensity adjustment unit based on the intensity difference.
[0024]
With this configuration, for example, when the intensity of one output optical signal is always very low, it is not necessary to reduce the intensity unnecessarily to other output optical signals in accordance with this output optical signal.
[0025]
In the optical signal switching device of the present invention, the input intensity detection unit and the output intensity detection unit are provided in each waveguide, and demultiplex a predetermined amount of light among the light propagating through the waveguide. It can be comprised from the splitter made to propagate, and the detector which detects the intensity | strength of the light which propagates the splitter.
[0026]
With this configuration, for example, by dividing about 1/10 of the amount of each of the incident light and the emitted light, the intensity of the incident light and the emitted light can be grasped without disturbing these lights.
[0027]
In the optical signal switching device according to the present invention, the output intensity adjusting unit has both the first path state in which the incident light takes the first path, the second path state in which the second path is taken, and both states. An optical switch capable of continuously taking an intermediate state having an arbitrary ratio can be provided (claim 8).
[0028]
With this configuration, it is often possible to configure the output intensity adjusting unit using a mechanical structure almost similar to that of the optical switch by increasing the accuracy of control.
[0029]
In the optical signal switching device of the present invention, the unnecessary optical waveguide connecting the optical switch is provided, and the unnecessary optical waveguide can be used as the second path.
[0030]
With this configuration, unnecessary light to be cut can be divided into the unnecessary optical waveguides.
[0031]
In the optical signal switching device of the present invention, an optical absorber can be disposed in the unnecessary optical waveguide between the optical switches.
[0032]
With this configuration, unnecessary light is absorbed by the light absorber, so that adjacent optical switches are not affected.
[0033]
In the optical signal switching device of the present invention, the second path connected to the optical switch joins the unnecessary optical waveguide, and the end of the unnecessary optical waveguide can be opened to the outside.
[0034]
According to this configuration, the unnecessary optical waveguide can emit unnecessary light to the outside without adversely affecting the adjacent optical switch.
[0035]
In the optical signal switching device of the present invention, the input waveguide and the output waveguide are arranged so as to intersect within the waveguide housing sheet, and the optical switch and the output intensity adjusting unit include the waveguide housing sheet at the intersection. And a portion where the waveguide is cut so as to cross the corner portion, and an opening / closing control unit for controlling opening and closing of the notch.
[0036]
According to this configuration, the optical switch and the output intensity adjusting unit can be manufactured almost in the same manner. However, since the output intensity adjusting unit takes an intermediate state, it needs to be finished with higher accuracy than the optical switch, and the control system needs to have specifications with higher control accuracy than the binary selection optical switch.
[0037]
In the optical signal switching device of the present invention, the open / close control unit can include a pressing member that pushes the cut portion and a pressing amount control unit that controls the pressing amount of the pressing member.
[0038]
With this configuration, an optical signal switching device can be manufactured with a simple structure.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0040]
(Embodiment 1)
FIG. 1 is a diagram showing an optical signal switching device according to Embodiment 1 of the present invention. In the present embodiment, a description will be given of an optical signal switching device formed of a 4 × 4 waveguide in which a column of intermediate state variable switches is added immediately before an output unit. The intermediate state variable switch 15 that is the added output intensity adjusting unit (light amount adjusting unit) can adjust the straight traveling state and the course changing state to an arbitrary ratio. A light absorber 16 is provided in the waveguide 17 connecting the added intermediate state variable switch. Each of the waveguides 5 and 17 is housed in the polyimide film 2 of the waveguide housing sheet.
[0041]
The optical signal passing through IN-1 to IN-4 of the input unit 21 reaches each intermediate state variable switch 15 through the optical switch 11 arranged at the intersection. By this intermediate state variable switch (output intensity adjusting unit), a part of the light goes straight and the rest is reflected to change the course by 90 degrees. This reflected and changed light is unnecessary light and is absorbed by the light absorber. This light absorber is provided in order to prevent a problem that the reflected unnecessary light enters the adjacent intermediate state variable switch and is mixed into the adjacent output fiber.
[0042]
On the other hand, the light that travels straight through the intermediate state variable switch is emitted to the output fiber 22, but a part of the light amount, for example, 1/10 light amount is demultiplexed by the optical demultiplexer 23, and is a photo detector. The light is guided to the diode 24 and the amount of light is detected. In FIG. 1, the duplexer and the photodetector provided in OUT-4 are shown with emphasis on the ease of understanding of the drawing. However, for OUT-1 to OUT-3, the duplexer is provided in each output unit. And a photodetector. A photodiode (PD: Photo-Diode) or the like can be used as the photodetector. By comparing the output values of these photodetectors and feeding back to the intermediate state variable switch 15 arranged in each output unit to adjust the straight component, the output values can be made uniform.
[0043]
Next, the configuration of the intermediate state variable switch will be described. FIG. 2 is a configuration diagram illustrating the intermediate state variable switch 15 which is a light amount adjusting unit used in the optical signal switching device of FIG. Piezoelectric actuators 6 a and 6 b are arranged above and below the cut portion 10 of the waveguide 5 accommodated in the polyimide film 2. The voltage adjusted by the applied voltage adjusting unit is applied to the piezo actuator 6b disposed above the notch. Upon receiving an output value detected by a photodetector such as a photodiode PD, the applied voltage adjustment unit can adjust the applied voltage. Since the piezo actuator changes the amount of displacement according to the applied voltage value, the amount of pushing the notch can be changed according to the applied voltage.
[0044]
FIG. 3 is a cross-sectional view showing the intermediate state variable switch 1 taking a predetermined intermediate state. According to FIG. 3, in the cut portion 10, a predetermined portion of the thickness of the core 5 is separated to form a gap 9, and the core of the remaining thickness is in close contact. By changing the close contact height in the cut portion 10, the thickness of the close contact portion and the separation portion of the core at the cut portion can be changed to change the distribution of the transmission amount and the reflection amount.
[0045]
By configuring as described above, the optical signal output value can be made constant by arranging the intermediate state variable switch in the waveguide of the optical signal switching device. In the case of the present embodiment, the amount of light can be adjusted by an intermediate state variable switch having almost the same mechanism as that of the optical switch, so that there is an advantage that the configuration becomes simple and the manufacture becomes easy.
[0046]
In some cases, the input side and output side of the optical signal switching device in FIG. 1 are reversed. Referring to FIG. 1, light emitted from the output fiber first enters the intermediate state variable switch. Here, some of the light travels straight, but the remaining light is reflected and travels to the left in FIG. 1 and is absorbed by the light absorber. The light that travels straight passes through the optical switch and then reaches the input fiber. The input fiber can also be provided with an optical demultiplexer, and a partial output of the optical fiber can be detected by a photodetector to adjust the intermediate state variable switch.
[0047]
Thus, even when the input side and the output side of the optical signal switching device in FIG. 1 are used in reverse, the output values of the optical signals can be made uniform by a simple mechanism.
[0048]
(Embodiment 2)
FIG. 4 is a diagram illustrating an optical signal switching device according to Embodiment 2 of the present invention. In the present embodiment, a light amount adjusting unit (based on a route signal from a route determining unit that determines the state of each optical switch 11 disposed at a lattice point that is an intersection of an input waveguide and an output waveguide) The intermediate state variable optical switch is controlled.
[0049]
The route determination unit determines a combination of input and output, and sends a route signal having information on the combination to each optical switch. Based on this route signal, it is determined whether the optical switch at each lattice point is in the passing state or the reflection path changing state, and the optical switch is activated.
[0050]
On the other hand, the light amount of each output unit is obtained based on the route signal from the route determining unit, and therefore, the light amount variation between the output units is obtained. This is because the optical path length and the number of optical switches are uniquely determined according to the route. Therefore, the light amount adjustment determination unit obtains the light amount adjustment amount in the light amount adjustment unit in each light amount adjustment unit, that is, (a) the light amount to be passed and (b) the light amount to be reflected based on the route signal. When the intermediate state variable optical switch is used, if (a) the amount of light to be passed is determined, (b) the amount of light to be reflected is naturally determined. Each light amount adjustment unit receives a signal from the light amount adjustment determination unit, and performs light amount adjustment based on the signal. In the present embodiment, therefore, a mechanism for detecting the optical output value at the tip of the output fiber in the first embodiment is not necessary.
[0051]
FIG. 5 is a diagram illustrating the mechanism of the light amount adjusting unit. In the present embodiment, a pressure sensor is disposed on the piezoelectric actuator at each lattice point. The pressing force determination unit receives a signal from the light amount adjustment determination unit and calculates a pressing amount for pressing the polyimide film with the piezoelectric actuator. An appropriate voltage is applied to the piezo actuator based on the pressing amount. The magnitude of the pressure generated when the piezoelectric film is pressed by the piezoelectric actuator is detected by a pressure sensor.
[0052]
The opening degree when the piezo actuator pushes the polyimide film from below to widen the cut portion is proportional to the restoring force due to the elastic force of the polyimide film. More specifically, the displacement amount, which is the pushing amount of the piezo actuator, and the opening degree of the notch are in a proportional relationship, and the displacement amount and the restoring force are in a proportional relationship. For this reason, the pressure and the opening degree are in a proportional relationship.
[0053]
Since the pressure sensor measures the pressure generated by the restoring force of the polyimide film, the opening degree, that is, the ratio between the passing state and the reflecting state can be known from the pressure value. The pressure value signal is fed back to the pressing force determination unit, and the pressing force determination unit adjusts the applied voltage so as to reach a specified pressing amount. When the light amount adjustment unit is configured with an intermediate state variable switch, it is the pressing force to the polyimide film that determines the ratio of light transmission and reflection at the cut portion of the optical switch, so the light amount is adjusted by the above mechanism. be able to.
[0054]
As described above, by performing feedback control using a pressure sensor, the amount of light can be adjusted correctly even if the relationship between the voltage and the pressing force varies in the piezoelectric actuators at the respective lattice points.
[0055]
The light amount adjustment determination unit may store the result of actual measurement of the light loss amount in each optical path and optical switch, and determine the light amount adjustment amount using the value. In this case, even if there is a variation in the optical path or the loss value of the optical switch, it can be corrected, and the output values can be made uniform with higher accuracy.
[0056]
In the present embodiment, since the light output can be made constant without detecting a part of the light output by demultiplexing, there is an advantage that no loss of light occurs.
[0057]
In the above configuration, the light amount adjustment is controlled by the pressure sensor and the pressing force determination unit, but the displacement sensor is disposed instead of the pressure sensor, and the displacement determination unit is disposed instead of the pressing force determination unit, Light amount control can also be performed. In this case, the displacement of the piezo actuator is detected and fed back to the displacement determination unit, and the voltage applied to the piezo actuator is adjusted so as to reach a specified displacement amount.
[0058]
(Embodiment 3)
FIG. 6 is a diagram illustrating a configuration of the light amount adjusting unit 15 in the optical signal switching device according to the third embodiment of the present invention. In FIG. 6, only one light amount adjusting unit is shown, but the case of forming a plurality of light amount adjusting units is not different from the light amount adjusting unit shown in the first and second embodiments. A waveguide 17 through which the light reflected by the light amount adjusting unit 15 and whose path is changed passes is extended in the lateral direction both on the right side and the left side of the light amount adjusting unit. The waveguide extending in the horizontal direction is bent at a right angle so as to extend in the vertical direction and is connected to the end waveguide 27.
[0059]
According to the above configuration, a part of the light entering the light amount adjusting unit goes straight and is emitted to the output fiber 22 as before. On the other hand, the reflected light propagates in the waveguide 17 in the right direction, changes its path, and goes out through the connected end waveguide 27. Therefore, even if the light absorber is not used, the light that is unnecessary in the light amount adjusting unit and whose route is changed is emitted to the outside through the end waveguide 27.
[0060]
When the input side and the output side of the optical signal switching device of the present embodiment are interchanged, the light traveling straight at the light amount adjusting unit travels straight from the lower side to the upper side, and the light changing the path is reflected. It proceeds to the left and escapes from the end of the waveguide as well.
[0061]
In the above configuration, since the light absorber is not used for unnecessary light processing, there is an advantage that there is no heat generation in the light absorber and deterioration of the light absorber itself.
[0062]
(Embodiment 4)
FIG. 7 is a diagram showing an optical signal switching device according to Embodiment 4 of the present invention. In this embodiment, an optical demultiplexer is provided not only on the output fiber but also on the input fiber side. A part of the light transmitted through the input fiber, for example 1/10, is demultiplexed, and the light quantity of the demultiplexed light is detected by a photodetector. A part of the light amount on the output side is also demultiplexed, and the light amount is detected by a photodetector.
[0063]
Next, the amount of loss at the optical switch can be calculated by subtracting the light amount on the output side from the value of the light amount on the input side. Although FIG. 7 shows only the difference between IN-1 and OUT-4, the same processing is performed for all input side fibers and output side fibers so that the difference amount is the same at each output unit. As shown in FIG.
[0064]
In the above, the combination of which input fiber is subtracted from which input fiber can be changed depending on the combination of routes.
[0065]
As described above, by adjusting the difference value, for example, when the light amount of one input is always low, it is possible to prevent the light amount of the other output value from being reduced more than necessary.
[0066]
Although the embodiments of the present invention have been described above, the embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is not limited to these embodiments. For example, the light amount adjusting unit is not limited to the optical switch in which the cut portion is in the intermediate state, but in the intermediate state of the waveguide optical switch using the thermo-optic effect, or in the middle of the optical switch in which matching oil is provided at the waveguide intersection. It may be in a state. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.
[0067]
【The invention's effect】
By using the optical signal switching device of the present invention, it is possible to suppress variations in the intensity of the output optical signal within a predetermined range with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an optical signal switching device according to a first embodiment of the present invention.
2 is a cross-sectional view showing a structure of an emitted light adjusting unit in FIG. 1. FIG.
3 is a diagram for explaining an intermediate state of an optical switch constituting the outgoing light adjusting unit in FIG. 2;
FIG. 4 is a diagram illustrating an optical signal switching device according to a second embodiment of the present invention.
5 is a cross-sectional view showing a structure of an emitted light adjusting unit in FIG. 4;
FIG. 6 is a diagram illustrating a configuration of an outgoing light adjustment unit of an optical signal switching device according to a third embodiment of the present invention.
FIG. 7 is a diagram showing an optical signal switching device according to a fourth embodiment of the present invention.
FIG. 8 is a perspective view showing a part of an optical switch of a conventional optical signal switching device.
FIG. 9 is a diagram illustrating a conventional optical signal switching device.
FIG. 10 is a diagram showing a passing state (on state) of an optical switch of a conventional optical signal switching device.
FIG. 11 is a diagram showing a route change state (off state) of an optical switch of a conventional optical signal switching device.
[Explanation of symbols]
2 waveguide housing polyimide film, 3 presser plate, 5 waveguide, 6a, 6b piezo actuator, 10 notch, 10a notch in passing state, 10b notch in path change state, 11 optical switch.

Claims (13)

A plurality of input waveguides and a plurality of output waveguides, wherein the output of each optical signal input to the input waveguide is switched at an intersection of the input waveguide and the output waveguide. An optical signal switching device that outputs an optical signal to a waveguide,
An optical switch disposed at the intersection and switching a path of the optical signal;
A switch state controller that controls the state of the optical switch to form the output optical signal;
An output intensity adjusting unit for adjusting the intensity of the output optical signal ,
The input waveguide and the output waveguide are arranged so as to intersect in the waveguide housing sheet,
The optical switch includes a portion where the waveguide is cut so as to cross a corner portion including the waveguide housing sheet at the intersection, and an open / close control unit that controls opening and closing of the cut portion,
The output intensity adjusting unit includes a portion where the waveguide is cut including the waveguide housing sheet, and an open / close control unit that controls opening and closing of the cut portion,
The optical signal switching device , wherein the open / close control unit that controls opening / closing of the cut portion of the output intensity adjusting unit changes a light transmission amount at the cut portion .   The light according to claim 1, further comprising: an output intensity detection unit that detects an intensity of the output optical signal; and an intensity adjustment control unit that controls an output state of the output intensity adjustment unit based on the output intensity value. Signal switching device. The output intensity detector is provided in the output waveguide and demultiplexes and propagates a predetermined proportion of light propagating through the output waveguide, and propagates through the demultiplexer The optical signal switching device according to claim 2, further comprising a detector that detects the intensity of the light.   Based on the route determining unit that determines the route until the optical signal input to the input waveguide is output, and the route of the optical signal output to the output waveguide, the loss of the optical signal in each route is reduced. Output light loss amount calculation unit to be calculated, and output intensity adjustment unit to reduce the intensity of the output light via the route with a small output light loss amount so that the intensity of each output optical signal is matched based on the output light loss amount The optical signal switching device according to claim 1, further comprising an intensity adjustment control unit that controls the state of the optical signal.   The optical signal switching device according to claim 4, wherein the loss of the optical signal in each route is calculated based on the number of the optical switches in the route and the waveguide length of the route.   An output intensity detector that detects the intensity of the output optical signal, an input intensity detector that detects the intensity of the input optical signal, and a difference between the intensity of the output optical signal and the intensity of the input optical signal 2. The optical signal switching device according to claim 1, further comprising: an intensity difference calculating unit that calculates the intensity difference; and an intensity adjustment control unit that controls an output state of the output intensity adjusting unit based on the intensity difference. The input intensity detection unit and the output intensity detection unit are provided in respective waveguides, and a demultiplexer that demultiplexes and propagates a predetermined proportion of the light propagating through the waveguide, and The optical signal switching device according to claim 6, further comprising a detector that detects an intensity of the light propagating through the duplexer.   The output intensity adjusting unit has an intermediate state in which the incident light has a first course state in which the first course is taken, a second course state in which the second course is taken, and both states at an arbitrary ratio. The optical signal switching device according to claim 1, comprising an optical switch that can be taken continuously.   The optical signal switching device according to claim 8, further comprising an unnecessary optical waveguide connecting the optical switches, wherein the unnecessary optical waveguide is used as the second path.   The optical signal switching device according to claim 8 or 9, wherein a light absorber is disposed in the unnecessary optical waveguide between the optical switches.   9. The optical signal switching device according to claim 8, wherein the second path connected to the optical switch joins an unnecessary optical waveguide, and an end of the unnecessary optical waveguide is open to the outside.   The input waveguide and the output waveguide are arranged so as to intersect with each other in a waveguide housing sheet, and the optical switch and the output intensity adjusting unit include a corner portion including the waveguide housing sheet at the intersecting portion. The optical signal switching device according to claim 1, further comprising: a portion where the waveguide is cut so as to cross, and an open / close control unit that controls opening / closing of the cut portion.   The optical signal switching device according to claim 12, wherein the opening / closing control unit includes a pressing member that presses the cut portion and a pressing amount control unit that controls a pressing amount of the pressing member.

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