JP6898553B2 - Optical signal processor - Google Patents

Description

The present invention mainly relates to an optical signal processing device.

With the spread of the Internet, the demand for data communication networks is exploding. The demand for larger capacities and transparent optical communication networks that support this demand is increasing. In response to such demands for optical communication networks, wavelength division multiplexing (WDM) transmission has been put into practical use from the viewpoint of increasing capacity. In addition, research and development of a space division multiplexing (SDM) transmission method is progressing. On the other hand, from the viewpoint of transparency, the importance of network systems such as ROADMs (Reconfigurable Optical Add / Drop Multiplexers), which can perform signal processing as optical signals without using electrical switching, is increasing. 1-input N-output (or N-input 1-output) wavelength selection switch (WSS: Wavelength Selective Switch) equipped with a switching function that selects a route for each WDM signal wavelength, or a variable that imparts an arbitrary dispersion amount for each wavelength. Research and development of optical signal processing devices such as Tunable Optical Dispersion Compensator (TODC) are being energetically promoted. Furthermore, there is an increasing need for research and development of optical nodes that enable flexible switching of optical signals when a transmission line is configured with spatial multiplex fibers such as a plurality of single-mode fibers or multi-core fibers.

The general configuration and operating principle of optical signal processing devices such as WSS and TODC will be described. The WDM signal input from the input optical fiber propagates in space as collimated light by a collimator, passes through a plurality of lenses and a diffraction grating for wavelength division multiplexing, and then is collected again through the lenses. A spatial light modulator (SLM) for giving a desired phase change to an optical signal is arranged at the focusing position.

Typical examples of this SLM include MEMS (Micro-electro mechanical mirror device) elements and LCOS (Liquid crystal on Silicon) elements. Each optical signal is given a desired phase change and reflected by the SLM. Each reflected optical signal enters the diffraction grating through the lens, is wavelength-combined, and then is coupled to the output fiber via the lens.

Non-Patent Document 1 describes an example of WSS in which the spectroscopic spatial optical system and the LCOS element are combined as described above. Fig. of Non-Patent Document 1. The optical signal processing device shown in No. 2 has a configuration in which a wavelength division multiplexing signal is beam-shaped on the surface of the LCOS element in two dimensions of a wavelength axis and a switching axis, and an arbitrary output port is selected for each wavelength. Since the input / output portion of Non-Patent Document 1 is a fiber array, highly accurate alignment is required for the position of each device. Non-Patent Document 2 uses a spatial beam transformer (SBT) created on a planar lightwave circuit (PLC) as an input / output portion, and uses an optical signal processing device combined with a spatial optical system. is suggesting. With this combination, it is possible to obtain a WSS in which the number of places where high-precision alignment is required is reduced.

In the ROADM node, it is common to mount a plurality of optical signal processing devices as described above at the same time. FIG. 15 is a diagram showing a configuration example of a conventional ROADM node. The configuration example shown in the figure is a typical configuration of a ROADM node having N input routes and N output routes in which a plurality of conventional WSSs are mounted on one node (see Patent Document 1). Here, the route is a transmission line for connecting the ROADM node to a ground (connection destination) different from the position where the ROADM node is provided. The configuration shown in the figure is a route-and-select type configuration in which N WSSs with 1 input and 1 output and WSSs with N L inputs and 1 output are woven and connected. For the WDM signal input to the ROADM node, the WSS group on the input side selects a drop or through route according to the wavelength of the WDM signal. The optical signal dropped by the WSS group on the input side is transmitted to a desired receiver in the receiver group via the wavelength demultiplexing unit group. On the other hand, the optical signal transmitted from the desired transmitter in the transmitter group is transmitted to the adjacent node by the WSS group on the output side via the wavelength combiner group.

In the configuration example shown in FIG. 15, the wavelength demultiplexing unit group and the wavelength combining unit group are configured by using the contention WSS of N input and M output. Signals of any wavelength can be transmitted / received from the transmitter / receiver from any direction (Colorless / Directionless function). However, when optical signals of the same wavelength are dropped from a plurality of input side WSSs at the same time, collision of optical signals (hereinafter referred to as contention) occurs when a wave is combined in the contention WSS. Therefore, it is necessary to set the optical path so that contention does not occur. In addition, a configuration has been proposed in which a contentless WSS is used so that no contention is generated even if optical signals of the same wavelength are dropped from multiple WSSs on the input side at the same time (Colorless / Directionless / Contention-). less function), there are various methods.

In FIG. 15, L is a natural number (L = N + K-1) obtained by subtracting 1 from the sum of the number K of N × M contention WSSs in the wavelength demultiplexing group and the wavelength combining group and the number of directions N. Is. M is the number of ports connected to the N × M contention WSS and the transmitter / receiver group in the wavelength demultiplexing unit group and the wavelength combining unit group. Further, N is the number of ports connected to the N × M contention WSS and the input / output group WSS in the wavelength demultiplexing unit group and the wavelength combining unit group. This number of ports is equal to the number of directions N.

The above-mentioned ROADM node requires many WSS modules, and there is a problem that the ROADM device cannot be miniaturized due to the limitation due to the size (volume) occupied by the WSS module. On the other hand, an optical module that integrates a plurality of WSSs mounted in a ROADM node has been proposed (Non-Patent Document 3).

FIG. 16 is a diagram showing a configuration example of an optical system of an optical signal processing device that integrates k units of n inputs and m outputs of WSS. The configuration example shown in the figure is a configuration example in the case of k = 4, n = 1, and m = 3. In this configuration example, n + m spatial beam transformers (SBTs) are formed in the PLC constituting the optical input / output unit, and k input / output ports are coupled to one SBT. FIG. 17 is a diagram showing a configuration example of SBT. As shown in FIG. 17, the SBT configuration has a circuit configuration similar to that of the AWG (Arrayed-waveguide grating). The subsequent slab waveguide in the AWG corresponds to the spatial optics of the WSS. The length of each array waveguide in SBT is set to be the same. Therefore, SBT has no wavelength dependence.

The optical signal input from the central input waveguide spreads to the desired beam diameter on the slab waveguide, propagates to the chip end via the array waveguide, and is output in the direction perpendicular to the chip end face. .. The chip end face is the end face on the side where the optical signal is emitted into space. On the other hand, the optical signal input to the SBT from a different input waveguide keeps a tilted plane wave and propagates to the chip end, so that the optical signal is also output as a tilted wavefront with respect to the spatial optical system. This is because the angles of each input / output waveguide and slab waveguide are set so that the input / output waveguides are coupled to the slab waveguides at different angles and the wave planes of the input signals are emitted into space at different angles. This is because it has been adjusted.

In this way, each optical signal is output to the spatial optical system from the same location on the chip end in different directions. Further, since the chip end face to which the array waveguide is connected has a configuration that coincides with the x-axis, the optical signal output from the array waveguide into space is output as a plane wave whose phase is aligned in the x-axis direction, and x. Propagates space as a beam collimated with respect to the axial direction.

The spatial optical system constitutes a 2-f optical system in the horizontal direction (x-axis direction) of the substrate from the chip end face on the exit side of the PLC to the LCOS element which is a switching element. In the 2-f optical system, the angular component on the anterior focal plane is converted to a position on the posterior focal plane, so that the optical signals output at different angles are focused on different positions on the LCOS element. As a result, the optical system of the optical signal emitted each time differently can be regarded as an independent optical system for the optical signal of each WSS. Based on such a principle, a method of integrating a plurality of functions in a single optical system is called an angle multiplexing method. The LCOS element includes a plurality of liquid crystal phase shifters arranged on a two-dimensional plane, and controls the liquid crystal phase shifters individually. The LCOS element deflects and reflects input light by setting a sawtooth-like phase pattern in the x-axis direction for a plurality of liquid crystal phase shifters. The optical signal reflected by the LCOS element passes through the 2-f optical system again and is incident on the PLC again.

Here, the optical signal deflected on the back focus surface, that is, the surface of the LCOS element is focused on the position of the end surface of the PLC chip whose deflection angle is converted. Further, the optical signal reflected off the optical axis also reaches the chip at the same angle as the input path on the end face of the PLC chip. This is the principle of the 2-f optical system. The optical signal re-input to the PLC is output to the corresponding output port via the output waveguide arranged at the re-input end of the SBT for output.

By sharing the optical input / output unit and the spatial optical system with a plurality of WSSs in this way, many merits such as reduction of initial introduction cost, reduction of power consumption, and reduction of load of control system can be expected.

Japanese Unexamined Patent Publication No. 2010-081374

Glenn Baxter, Steven Frisken, Dmitri Abakoumov, Hao Zhou, Ian Clarke, Andrew Bartos and Simon Poole, "Highly programmable Wavelength Selective Switch based on Liquid Crystal on Silicon switching elements," paper OTuF2 OFC / NFOEC (2006) Kazunori Seno, Kenya Suzuki, Naoki Ooba, Toshio Watanabe, Masayuki Itoh, Tadashi Sakamoto and Tetsuo Takahashi, "Spatial beam transformer for wavelength selective switch consisting of silica-based planar lightwave circuit," paper JTh2A.5 OFC / NFOEC (2012) Yuichiro Ikuma, Kenya Suzuki, Naru Nemoto, Etsu Hashimoto, Osamu Moriwaki and Tetsuo Takahashi, "Low-Loss Transponder Aggregator Using Spatial and Planar Optical Circuit," Journal of Lightwave Technology, vol.34, no.1, 2016

However, the optical signal processing apparatus that integrates the plurality of WSS # 1 to # 4 shown in FIG. 16 has the following problems. When the main signal light is input to either WSS, angular coupling occurs in the optical system of the optical signal processor due to the angular multiplexing scheme. Due to the coupling in the angular direction, crosstalk occurs in which a part of the main signal light input to the other WSS is superimposed on the main signal light input to the WSS. In particular, in a digital coherent transmission system, the influence of crosstalk (hereinafter referred to as the same wavelength crosstalk) between signal lights having the same wavelength becomes dominant and the signal quality is deteriorated. In the following, port isolation is defined as a performance index of the optical signal processing device, and it is shown that the magnitude of crosstalk is determined by port isolation.

The number of signals of the same wavelength that are simultaneously input to each input / output port # 1 to # 4 of WSS # 1 to # 4 is l (1 ≤ l ≤ k), and the electric field of each input signal is E _i ⁱⁿ , (1 ≤ i). ≤l) Assuming that the components of the transfer function matrix of the optical system of the optical signal processor are β _ij · exp (jθ _ij ), (1 ≤ i, j ≤ l), the signal electric field after the output of the optical signal processor is given by the equation ( It can be written as 1).

At this time, the port isolation from the port i to the port j (i ≠ j) is defined as in the equation (2).

Further, when the leakage from the other port i (i ≠ j, 1 ≦ i ≦ l) is superimposed on the main signal light input to the port j, the electric field of the main signal is expressed by the equation (3). To.

At this time, the crosstalk XT is defined as in the equation (4).

In deriving the rightmost side of equation (4), it is assumed that equation (5) holds, and β _ij and β _ii are constant for all i, j (i ≠ j), and as a result, As shown in equation (6), it is assumed that the ratio of the two is also constant.

Ρ in Eqs. (4) and (6) indicates the port isolation defined in Eq. (2), and the crosstalk is determined by the product of the number of signals input to each WSS at the same time and the port isolation. Is shown.

FIG. 18 is a graph showing an evaluation example of port isolation between WSSs in an optical signal processing device. The figure shows an example in which port isolation between WSSs in an optical signal processing device in which seven 1 × 8 WSSs are integrated is evaluated experimentally. The experimental conditions are as follows. A PLC equipped with nine SBTs connected to seven input / output ports was prepared, and the PLC was incorporated into a benchtop type spatial optical system including a diffraction grating, a lens, and an LCOS element for measurement. The measurement target measured the port isolation between WSS # 1 and WSS # 2 at adjacent positions and the port isolation between WSS # 1 and WSS # 3 at non-adjacent positions.

First, the main signal light is input to WSS # 1 from the input port, and the signal power output from the specific output port of WSS # 1 is measured. Next, the power of the leaking light output from the same port used in WSS # 1 is measured in WSS # 2 or WSS # 3 while the signal light is conducted to WSS # 1. At that time, switch control was performed on the LCOS element so that the leaked light generated in WSS # 2 or WSS # 3 was coupled to the output port, and the main signal light input to WSS # 1 was not coupled to the output port. .. The C band ASE light was input to the input port of WSS # 1 as the main signal light, and the output light spectrum from the output ports of WSS # 2 and WSS # 3 was measured by an optical spectrum analyzer.

The evaluation results are as follows. The port isolation between the adjacent WSSs WSS # 1 and WSS # 2 was -30 dB, and the port isolation between the non-adjacent WSSs WSS # 1 and WSS # 3 was -45 dB. These values are the average values of port isolation from 1528 nm to 1566 nm in the spectrum. This evaluation result indicates that the imperfections in port isolation cause leakage of signal light between WSSs. From this, it can be seen that in the worst case, if the same wavelength signal is input to all the input ports of WSS at the same time, the influence of crosstalk on the main signal becomes remarkable and the signal quality may be deteriorated. In particular, the influence of crosstalk leaking from the adjacent WSS becomes dominant.

The present invention has been made in view of such a problem, and an object of the present invention is to suppress deterioration of communication quality due to crosstalk that occurs in the optical system of an optical signal processing device due to the angle multiplexing method. It is in.

The optical signal processing device according to the first aspect of the present invention includes a plurality of optical input / output units having a plurality of ports for inputting / outputting signal light, a condensing unit for collecting signal light input to the ports, and a condensing unit. A spatial light modulator that deflects the signal light collected by the condensing unit is provided, and the traveling direction of the signal light input to the plurality of ports to the condensing unit is determined for each of the optical input / output units. The position in the spatial light modulation unit where the signal light input to the plurality of ports is collected by the condensing unit is different for each optical input / output unit and is included in the different optical input / output unit. When a set of the ports that input / output signal light that enters and outputs the spatial light modulator at the same angle is a port group, at least one of the ports is the input of the signal light. And at least one other said port is used to output the signal light.

According to the second aspect of the present invention, in the first aspect described above, the optical input / output section is formed in a planar light wave circuit.

According to the third aspect of the present invention, in the second aspect described above, the planar light wave circuit includes a slab waveguide provided for each port group and connected to the port included in the port group, and said. The signal light input to the port includes an array waveguide provided for each slab waveguide and connected to the slab waveguide, and the signal light input to the port is emitted from the array waveguide toward the condensing unit.

According to the fourth aspect of the present invention, in any of the first to third aspects described above, the spatial light modulation unit has an LCOS (Liquid Crystal on Silicon) element.

According to the fifth aspect of the present invention, in any of the first to fourth aspects described above, the port for inputting signal light and the port for outputting signal light are alternately alternated in the optical input / output unit. Have been placed.

According to the sixth aspect of the present invention, in any one of the first to fifth aspects described above, a spectroscopic unit that demultiplexes the signal light toward the condensing unit for each wavelength is further provided, and the signal light is divided for each wavelength. Each of the waved signal lights is collected at different positions in the spatial light modulation unit by the condensing unit.

According to a seventh aspect of the present invention, in any of the sixth aspects described above, the spatial light modulator deflects the signal light for each desired wavelength contained in the signal light, and a plurality of the desired desired ones. The signal light of the wavelength is coupled to each of the ports used for the output of the signal light.

According to the eighth aspect of the present invention, in any of the sixth or seventh aspects described above, the number of the ports possessed by each of the optical input / output units is N (N is an integer of 2 or more). In at least one of the optical input / output units, m (m is a natural number of N-1 or less) of the ports is used for inputting signal light, and n (n = Nm) of the ports are signal light. In the other optical input / output unit, n of the ports are used for inputting signal light, and m of the ports are used for outputting signal light.

According to the ninth aspect of the present invention, in any of the first to eighth aspects described above, the port to which the signal light is input among the plurality of ports receives the signal light from the same node, and the signal light is input. Of the plurality of ports, the port that outputs the signal light outputs the signal light to the same node.

According to the present invention, it is possible to suppress deterioration of communication quality due to crosstalk that occurs in the optical system due to the angle multiplexing method.

It is a figure which shows the structural example of the optical signal processing apparatus which concerns on 1st Embodiment. It is a figure which shows the example of the allocation of the signal light input and output to the input / output port provided in the optical input / output part. It is a figure which shows the structural example of the optical signal processing apparatus which concerns on 2nd Embodiment. It is a figure which shows the structural example of the optical signal processing apparatus which concerns on 3rd Embodiment. It is a figure which shows the structural example of the optical signal processing apparatus which concerns on 4th Embodiment. It is a figure which shows the structural example of the optical signal processing apparatus which concerns on 5th Embodiment. It is a figure which shows the example of the allocation of the input and the output to each input / output port in the optical signal processing apparatus which concerns on 5th Embodiment. It is a graph which shows the influence of crosstalk in the conventional optical signal processing apparatus and the optical signal processing apparatus which concerns on this embodiment. It is a figure which shows the application example of the optical signal processing apparatus which concerns on 6th Embodiment. It is a figure which shows the application example of the optical signal processing apparatus which concerns on 7th Embodiment. It is a figure which shows the application example of the optical signal processing apparatus which concerns on 8th Embodiment. It is a figure which shows the structure of the node to which the optical signal processing apparatus applies. It is a figure which shows the application example of the optical signal processing apparatus which concerns on 9th Embodiment. It is a figure which shows the structure of the node to which the optical signal processing apparatus applies. It is a figure which shows the configuration example of the conventional ROADM node. It is a figure which shows the structural example of the optical system of the optical signal processing apparatus which integrated the WSS of k units of n inputs and m outputs. It is a figure which shows the structural example of SBT. It is a graph which shows the evaluation example of the port isolation between WSS in an optical signal processing apparatus.

Hereinafter, the optical signal processing apparatus according to the embodiment of the present invention will be described with reference to the drawings. In each of the following embodiments, the components with the same reference numerals perform the same operation, and duplicate description will be omitted as appropriate.

[First Embodiment]
FIG. 1 is a diagram showing a configuration example of the optical signal processing device 100 according to the first embodiment. The optical signal processing device 100 includes optical input / output units 1 and 2, microlens arrays 101 and 102, a lens 103, and a spatial light modulator 104. The optical input / output unit 1, the microlens array 101, the lens 103, and the spatial light modulator so that the signal light emitted from the optical input / output unit 1 reaches the microlens array 101, the lens 103, and the spatial light modulator 104 in this order. 104 is arranged. The optical input / output unit 2, the microlens array 102, the lens 103, and the spatial light modulator so that the signal light emitted from the optical input / output unit 2 reaches the microlens array 102, the lens 103, and the spatial light modulator 104 in this order. 104 is arranged.

The optical input / output unit 1 includes three input / output ports 11, 12, and 13. The optical input / output unit 2 includes three input / output ports 21, 22, and 23. For example, a fiber array is used for the input / output ports of the optical input / output units 1 and 2. In the configuration example shown in FIG. 1, the case where the optical axis of the signal light emitted from the optical input / output unit 1 and the optical axis of the signal light emitted from the optical input / output unit 2 come closer to each other as they approach the lens is shown. ing. However, the signal light emitted from the optical input / output unit 1 and the signal light emitted from the optical input / output unit 2 may be separated from each other as they travel through the space.

In the optical signal processing device 100 shown in FIG. 1, the traveling direction of the signal light from the M (= 2) optical input / output units 1 and 2 is different for each of the optical input / output units 1 and 2. Further, the signal light emitted from the optical input / output units 1 and 2 is collected by the lens 103 at different positions on the spatial light modulator 104 for each optical input / output unit. Further, the signal light emitted from the N (= 3) input / output ports 11, 12, and 13 of the optical input / output unit 1 is subjected to phase modulation by the spatial light modulator 104 and reflected, and then the lens 103. As a result, the light is focused on any of the input / output ports 11, 12, and 13 of the optical input / output unit 1.

Further, the signal light emitted from the N (= 3) input / output ports 21, 22, and 23 of the optical input / output unit 2 is subjected to phase modulation by the spatial light modulator 104 and reflected, and then the lens 103. As a result, the light is focused on any of the input / output ports 21, 22, and 23 of the optical input / output unit 1. As described above, the configuration of the optical signal processing device 100 shown in FIG. 1 is characterized in that a plurality of functions can be integrated into a single optical system based on the principle of angle multiplexing.

Hereinafter, a set of input / output ports provided in different optical input / output units and in which signal light deflected at the same angle by the spatial light modulator 104 is collected is referred to as an "input / output port group". .. The deflection angle θ in the spatial light modulator 104 is the angle at which the signal light enters the spatial light modulator 104 or the angle at which the signal light is emitted from the spatial light modulator 104. The deflection angle θ is defined as an angle formed by the spatial light modulator 104 in the direction perpendicular to the main surface that performs deflection and reflection. The vertical direction of the main surface of the spatial light modulator 104 is the Z-axis direction in the XYZ coordinate system shown in FIG. In the optical signal processing device 100 shown in FIG. 1, there are three different deflection angles. Input / output port group # 1 including input / output port 11 and input / output port 21, input / output port group # 2 including input / output port 12 and input / output port 22, input / output port 13 and input / output port 23. I / O port group # 3 including the above exists according to the deflection angle.

The operation of the optical signal processing device 100 in the first embodiment will be described. The signal light input to any of the input / output ports of the optical input / output unit 1 is emitted into space as collimated light via the microlens array 101. The signal light propagating in space is focused by the lens 103 and focused on the region 104a on the spatial light modulator 104. The signal light focused on the region 104a is subjected to phase modulation according to the phase setting in the region 104a and reflected. The signal light is deflected to a desired angle according to the given phase by being given phase modulation. The angle at which the signal light is deflected is an angle in the XZ plane and is an angle with respect to the Z axis. The reflected signal light passes through the lens 103 again and is optically coupled to any of the input / output ports 11, 12, and 13 at positions corresponding to the deflection angles. The spatial light modulator 104 optically couples the input signal light to any of the input / output ports 11, 12, and 13, so that the signal light switching operation is performed.

Since the signal light input to any of the input / output ports of the optical input / output unit 2 is emitted into the space at a different angle from the signal light input to the optical input / output unit 1, the region 104a on the spatial light modulator 104a. Condenses on a region 104b different from the above. The signal light input to any input / output port of the optical input / output unit 2 is given a desired phase modulation in the region 104b on the spatial light modulator 104 and is reflected. The reflected signal light passes through the lens 103 again and is optically coupled to any of the input / output ports 21, 22, and 23 at positions corresponding to the deflection angles. The spatial light modulator 104 optically couples the input signal light to any of the input / output ports 21, 22, and 23, so that the signal light switching operation is performed.

Since the optical system of the signal light related to the optical input / output unit 1 and the optical system of the signal light related to the optical input / output unit 2 can be regarded as independent optical systems, a plurality of optical signal processing functions can be integrated. In each of the aggregated optical signal processing functions, the spatial light modulator 104 enables switching and dispersion addition to the input / output signal light.

FIG. 2 is a diagram showing an example of assigning signal light inputs and outputs to input / output ports provided in the optical input / output unit. The allocation shown in FIG. 2 is when the optical signal processing device includes four optical input / output units # 1 to # 4, and each of the optical input / output units # 1 to # 4 has four input / output ports # 1 to # 4. An example of allocation in. In the allocation example of the conventional optical signal processing device shown in FIG. 16, all the input / output ports # 1 of each optical input / output unit included in the input / output port group # 1 are assigned to the signal light input, and the input / output port group # 1 is assigned. Input / output port # 2 of each optical input / output unit included in 2, input / output port # 3 of each optical input / output unit included in input / output port group # 3, and each optical input / output included in input / output port group # 4. All the input / output ports # 4 of the unit are assigned to the signal light output.

In the allocation example # 1 in the present embodiment, at least one input / output port is assigned to the signal light input and at least one input / output port is assigned to the signal light output in each of the input / output port groups # 1 to # 4. There is. In particular, an example is shown in which half of the input / output ports in the input / output port groups # 1 to # 4 are assigned to the input and output of the signal light. In the allocation example # 2 in the present embodiment, an example in which the input and output of the signal light are alternately allocated in each of the input / output port groups # 1 to # 4 is shown.

Comparing the allocation example of the conventional optical signal processing device with the allocation examples # 1 and # 2 in the present embodiment, the number of signal lights propagating in the optical system in the same direction can be reduced in the example of the present embodiment. , It is possible to reduce the crosstalk generated in the optical system due to the angle multiplexing method. In particular, in the case of allocation example # 1 in the present embodiment, the number of input / output ports allocated to the signal light input and the number of ports allocated to the signal light output are half of the number of input / output ports in each input / output port group. The feature is that the number of signal lights propagating in the same direction can be reduced most, and the crosstalk reduction effect is maximized. Further, in the case of the allocation example # 2 in the present embodiment, since the signal light traveling in the optical system at a close angle propagates in the opposite direction, it is necessary to avoid leakage of the signal light from a close angle having a large crosstalk level. Can be done. In this case, the crosstalk reduction effect is characterized in that it is larger than that of the allocation example 1 in the present embodiment.

[Second Embodiment]
FIG. 3 is a diagram showing a configuration example of the optical signal processing device 200 according to the second embodiment. The optical signal processing device 200 includes a planar light wave circuit 201, a lens 103, and a spatial light modulator 104. The plane light wave circuit 201 is provided with optical input / output units 1 and 2. The signal light incident on the optical input / output units 1 and 2 passes through the waveguide formed in the planar light wave circuit 201, and is emitted from the exit end surface 201a of the planar light wave circuit 201 into space. The optical input / output units 1 and 2 are provided on a surface different from the emission end surface 201a of the planar light wave circuit 201. The planar light wave circuit 201, the lens 103, and the spatial light modulator 104 are arranged so that the signal light emitted from the exit end surface 201a reaches the lens 103 and the spatial light modulator 104 in this order.

The optical input / output unit 1 includes three input / output ports 11, 12, and 13. The optical input / output unit 2 includes three input / output ports 21, 22, and 23. Signal light deflected at the same angle by the spatial light modulator 104 is collected in the input / output port 11 and the input / output port 21. In other words, the signal light obtained at the input / output port 11 and the signal light obtained at the input / output port 21 have the same angle deflected by the spatial light modulator 104. Further, signal light deflected at the same angle by the spatial light modulator 104 is collected in the input / output port 12 and the input / output port 22. Signal light deflected at the same angle by the spatial light modulator 104 is collected in the input / output port 13 and the input / output port 23. That is, the optical signal processing device 200 includes an input / output port group # 1 including an input / output port 11 and an input / output port 21, an input / output port group # 2 including an input / output port 12 and an input / output port 22. There is an input / output port group # 3 including an input / output port 13 and an input / output port 23.

The planar light wave circuit 201 may include a function for adjusting the numerical aperture (NA: Numerical Aperture) of the beam emitted from the exit end surface 201a of the planar light wave circuit 201 toward the lens 103. Further, the optical signal processing device 200 may arrange a microlens array or the like in the vicinity of the surface from which the beam is emitted from the planar light wave circuit 201. By arranging the microlens array, the NA of the beam emitted into the space can be adjusted.

In FIG. 3, the waveguide of the signal light of each input / output port provided in the optical input / output unit 1 and the waveguide of the signal light of each input / output port provided in the optical input / output unit 2 are emitted toward the lens 103. A configuration example of the planar light wave circuits 201 that are closer to each other as they approach the end face 201a is shown. However, even if the plane light wave circuit 201 is provided with a configuration in which the signal light waveguide of the optical input / output unit 1 and the signal light waveguide of the optical input / output unit 2 are separated from each other as they approach the emission end surface 201a of the plane light wave circuit 201. Good.

The operation of the optical signal processing device 200 of this embodiment will be described. The signal light input to each input / output port of the optical input / output unit 1 propagates through the waveguide of the planar light wave circuit 201, and is emitted into space from the exit end surface 201a of the planar light wave circuit 201 toward the lens 103. The length and angle of the planar light wave circuit 201 are adjusted so that the signal light input from each input / output port of the optical input / output unit 1 is emitted from the planar light wave circuit 201 at an appropriate angle and position. It is equipped with a waveguide. The signal light emitted from the exit end surface 201a of the planar light wave circuit 201 is focused by the lens 103 and focused on the region 104a on the spatial light modulator 104. The signal light focused on the region 104a is deflected and reflected at a desired angle according to the phase setting in the region 104a of the spatial light modulator 104. The angle at which the signal light is deflected is an angle in the XX plane in the XYZ coordinate system shown in FIG. 3, and is an angle with respect to the Z axis. The reflected signal light passes through the lens 103 again and is optically coupled to any of the input / output ports provided in the optical input / output unit 1. The spatial light modulator 104 optically couples the input signal light to any of the input / output ports 11, 12, and 13, so that the signal light switching operation is performed.

The signal light input to each input / output port of the optical input / output unit 2 propagates through the waveguide of the planar light wave circuit 201, and is emitted into space from the exit end surface 201a of the planar light wave circuit 201 toward the lens 103. The length and angle of the planar light wave circuit 201 are adjusted so that the signal light input from each input / output port of the optical input / output unit 2 is emitted from the planar light wave circuit 201 at an appropriate angle and position with respect to each other. It is equipped with a waveguide. The signal light emitted from the exit end surface 201a of the planar light wave circuit 201 is focused by the lens 103 and focused on the region 104b on the spatial light modulator 104. The signal light focused on the region 104b is deflected and reflected at a desired angle according to the phase setting in the region 104b of the spatial light modulator 104. The angle at which the signal light is deflected is an angle in the XZ plane and is an angle with respect to the Z axis. The reflected signal light passes through the lens 103 again and is optically coupled to any of the input / output ports provided in the optical input / output unit 1. The spatial light modulator 104 optically couples the input signal light to any of the input / output ports 21, 22, and 23, so that the signal light switching operation is performed.

The signal light related to the optical input / output unit 1 and the signal light related to the optical input / output unit 2 are emitted into space from the emission end surface 201a of the planar light wave circuit 201 toward the lens 103 at different angles. Therefore, the signal light related to the optical input / output unit 1 and the signal light related to the optical input / output unit 2 are focused on different regions 104a and 104b on the spatial light modulator 104. That is, since the optical system of the signal light related to the optical input / output unit 1 and the optical system of the signal light related to the optical input / output unit 2 can be treated as independent optical systems, the optical signal processing device 200 integrates a plurality of functions. Can be realized.

In the optical signal processing device 200 of the second embodiment, since the optical input / output units 1 and 2 and the microlens array are integrated in the planar light wave circuit 201, generally used fiber arrays, microlens arrays, and the like are individually provided. No need to align. Further, the optical signal processing device 200 can solve the mounting load such as arranging the fiber array and the microlens array at different angles for each WSS functional unit by adjusting the circuit layout in the planar light wave circuit 201. The optical signal processing device 200 can further reduce the cost and greatly reduce the alignment load while obtaining the great merits obtained by the optical signal processing device 100 in the first embodiment.

[Third Embodiment]
FIG. 4 is a diagram showing a configuration example of the optical signal processing device 300 according to the third embodiment. The optical signal processing device 300 includes a planar light wave circuit 301, a lens 103, and a spatial light modulator 104. The plane light wave circuit 301 is provided with input / output ports 11, 12, and 13 constituting the optical input / output unit # 1 and input / output ports 21, 22, and 23 constituting the optical input / output unit # 2. The signal light incident from each input / output port passes through the plane light wave circuit 301 and is emitted into space from the exit end surface 301a of the plane light wave circuit 301. Each input / output port is provided on a surface different from the emission end surface 301a of the plane light wave circuit 301. The plane light wave circuit 301, the lens 103, and the spatial light modulator 104 are arranged so that the signal light emitted from the exit end surface 301a into the space reaches the lens 103 and the spatial light modulator 104 in this order.

The optical signal processing device 300 includes an input / output port group # 1 including an input / output port 11 and an input / output port 21, an input / output port group # 2 including an input / output port 12 and an input / output port 22, and an input / output port group # 2. There is an input / output port group # 3 including a port 13 and an input / output port 23.

The plane light wave circuit 301 includes the above-mentioned input / output ports, slab waveguides 311 and 312, 313 provided for each input / output port group, and for input / output connecting each input / output port and each slab waveguide. A waveguide and an array waveguide connecting each slab waveguide and an output end face 301a are formed. In each slab waveguide, the input / output waveguide so that the main ray of the signal light incident on the slab waveguide from the input / output waveguide intersects at one point at the end which is the boundary between the slab waveguide and the array waveguide. The installation angle between the slab waveguide and the slab waveguide is determined. Further, in the planar light wave circuit 301, each input / output port of the optical input / output unit # 1 and each input / output port of the optical input / output unit # 2 are alternately arranged.

The signal light input to each input / output port of the optical input / output units # 1 and # 2 passes through the input / output waveguide and enters the slab waveguides 311, 312, and 313, respectively. The signal light input to each slab waveguide propagates in the slab waveguide so as to spread in the plane of the plane light wave circuit 301 while being confined in the thickness direction of the plane light wave circuit 301. The thickness direction of the plane light wave circuit 301 is the Y-axis direction in the XYZ coordinate system shown in FIG. Since the wave surface of the signal light spreading in each slab waveguide has a curvature according to the propagation distance, the end of each slab waveguide has a shape that matches the curvature of the wave surface. The array waveguide that connects the end of each slab waveguide and the exit end surface 301a of the planar light wave circuit 301 includes a plurality of waveguides. The length of each waveguide contained in the array waveguide is equal.

The emission end surface 301a of the plane light wave circuit 301 is parallel to the XY plane. When the emission end surface 301a is parallel to the XY plane, the signal light emitted from the array waveguide into space is emitted as a plane wave whose phase is aligned in the X-axis direction, so that the signal light is emitted in the XY plane. It propagates in space as a beam collimated in the normal direction. The signal light emitted from the exit end surface 301a of the planar light wave circuit 301 passes through the lens 103 and is collected on the spatial light modulator 104. The signal light focused on the spatial light modulator 104 is reflected by the spatial light modulator 104 at an arbitrary angle for each wavelength, and is recombined with the emission end face 301a via the lens 103 again.

The signal light input to the input / output ports 11, 12, and 13 of the optical input / output unit # 1 is emitted into space from the emission end surface 301a of the planar light wave circuit 301 toward the lens 103 at the same angle. The emitted signal light passes through the lens 103 and is focused on the region 104a on the spatial light modulator 104. The signal light focused on the region 104a is deflected and reflected at a desired angle according to the phase setting in the region 104a of the spatial light modulator 104. The angle at which the signal light is deflected is an angle in the XX plane in the XYZ coordinate system shown in FIG. 3, and is an angle with respect to the Z axis. The reflected signal light passes through the lens 103 again and is recombined with the exit end face 301a. The signal light is output from any of the input / output ports 11, 12, and 13 depending on the position on the output end face 301a where the signal light is recombined. The optical signal processing device 300 sets the output destination of the signal light input to the input / output ports 11, 12, and 13 to any of the input / output ports 11, 12, and 13 according to the phase setting in the region 104a of the spatial light modulator 104. Select it.

The signal light input to the input / output ports 21, 22, and 23 of the optical input / output unit # 2 is emitted into the space from the emission end surface 301a of the planar light wave circuit 301 toward the lens 103 at the same angle. The emitted signal light passes through the lens 103 and is focused on the region 104b on the spatial light modulator 104. The signal light focused on the region 104b is deflected and reflected at a desired angle according to the phase setting in the region 104b of the spatial light modulator 104. The angle at which the signal light is deflected is an angle in the XZ plane and is an angle with respect to the Z axis. The reflected signal light passes through the lens 103 again and is recombined with the exit end face 301a. The signal light is output from any of the input / output ports 21, 22, and 23 depending on the position on the output end face 301a where the signal light is recombined. The optical signal processing device 300 sets the output destination of the signal light input to the input / output ports 21, 22, and 23 to any of the input / output ports 21, 22, and 23 according to the phase setting in the region 104b of the spatial light modulator 104. Select it.

The angle at which the signal light input to each input / output port of the optical input / output unit # 1 is emitted from the output end face 301a and the signal light input to each input / output port of the optical input / output unit 2 are emitted from the output end surface 301a. It is different from the angle to be done. Therefore, the signal light related to the optical input / output unit # 1 and the signal light related to the optical input / output unit # 2 are focused on different regions 104a and 104b on the spatial light modulator 104. That is, since the optical system of the signal light related to the optical input / output unit # 1 and the optical system of the signal light related to the optical input / output unit # 2 can be treated as independent optical systems, the optical signal processing device 300 has a plurality of functions. Can be aggregated.

Further, the optical signal processing device 300 according to the third embodiment has the effect obtained by the optical signal processing device 200 according to the second embodiment, and the planar light wave circuit 301 without arranging any additional members. The number of circuits required for NA adjustment installed on the board can be halved. As a result, the height of the chip forming the flat light wave circuit 301 in the X-axis direction is halved, and the number of complicated circuits is also halved, so that the effect of increasing the yield at the time of manufacturing the flat light wave circuit 301 can be obtained.

[Fourth Embodiment]
FIG. 5 is a diagram showing a configuration example of the optical signal processing device 400 according to the fourth embodiment. The optical signal processing device 400 includes optical input / output units 1 and 2, a diffraction grating 401, a lens 103, and a spatial light modulator 104. The optical input / output units 1 and 2, the diffraction grating 401, the lens 103, and the spatial light so that the signal light incident on the optical input / output units 1 and 2 reaches the diffraction grating 401, the lens 103, and the spatial light modulator 104 in this order. A modulator 104 is arranged. The configuration of the optical input / output units 1 and 2 is either a configuration in which the fiber array and the microlens array shown in the first embodiment are arranged or a configuration using the planar light wave circuit shown in the second embodiment. It may have the configuration of.

The operation of the optical signal processing device 400 of this embodiment will be described. The signal light input to the optical input / output units 1 and 2 is emitted into the space at different angles according to each optical input / output unit after the numerical aperture of the signal light is adjusted. The signal light propagating in space is wavelength-demultiplexed by the diffraction grating 401 on the ZZ plane in the XYZ coordinate system shown in FIG. The diffraction grating 401 functions as a spectroscopic unit that separates signal light for each wavelength. The wavelength-demultiplexed signal light is focused on the spatial light modulator 104 by the lens 103. The position on the spatial light modulator 104 where the signal light is focused is different for each wavelength. The position where the signal light is collected differs in the Y-axis direction on the main surface that reflects and deflects the spatial light modulator 104. When the position of each wavelength in which the signal light is collected is different in the Y-axis direction, the position of each optical input / output unit in which the signal light is collected is different in the X-axis direction. That is, the direction in which different positions are lined up for each optical input / output unit and the direction in which different positions are lined up for each wavelength are orthogonal to each other. The two directions do not have to be orthogonal as long as the difference between the optical input / output unit and the wavelength can be identified.

The focused signal light of each wavelength is reflected by the spatial light modulator 104 after applying the desired phase modulation for each wavelength. The reflected signal light is deflected to a desired angle in the XX plane at an angle corresponding to the phase setting of the phase modulation. The reflected signal light passes through the lens 103 again, further passes through the diffraction grating, is wavelength-combined, and then is coupled to an arbitrary input / output port. The optical signal processing device 400 performs a signal light switching operation by deflecting each optical input / output unit and each wavelength by the spatial light modulator 104.

The optical signal processing device 400 according to the fourth embodiment can perform switching, dispersion imparting, and the like for each wavelength in the spatial light modulator 104. Therefore, the optical signal processing device 400 includes a wavelength selection switch (WSS: Wavelength Selective Switch) having a switching function for selecting a direction for each WDM-ized signal wavelength, and variable dispersion compensation for imparting an arbitrary dispersion amount for each wavelength. It can be applied to a device (TODC: Tubable optical dispersion compensator), an optical spectrum analyzer, a spectrum shaper that freely shapes the spectrum shape of a transmitted signal, and the like.

[Fifth Embodiment]
FIG. 6 is a diagram showing a configuration example of the optical signal processing device 500 according to the fifth embodiment. In the fifth embodiment, the optical signal processing device 500 in which k WSSs having n inputs and m outputs and k WSSs having m inputs and n outputs are integrated will be described. The configuration example shown in FIG. 6 is for n = 1, m = 3, and k = 2. The optical signal processing device 500 includes a planar light wave circuit 501, a diffraction grating 502, a lens 503, and an LCOS element 504. The LCOS element 504 is an example of a spatial light modulator, which is a reflective liquid crystal panel formed on a silicon chip substrate.

The plane light wave circuit 501 includes 16 input / output ports 11-14, 21-24, 31-34, 41-44. The input / output ports 11 to 14 constitute the optical input / output unit # 1. The input / output ports 21 to 24 constitute the optical input / output unit # 2. The input / output ports 31 to 34 constitute the optical input / output unit # 3. The input / output ports 41 to 44 constitute the optical input / output unit # 4. Further, the optical signal processing device 500 includes an input / output port group # 1 including input / output ports 11, 21, 31, 41, and an input / output port group # 2 including input / output ports 12, 22, 32, 42. There is an input / output port group # 3 including input / output ports 13, 23, 33, 43 and an input / output port group # 4 including input / output ports 14, 24, 34, 44.

The planar light wave circuit 501 includes four spatial beam transformers (SBTs) # 1 to # 4. The number of beam converters provided in the plane light wave circuit 501 represents that the sum of the number of ports n and m of the WSS integrated in the optical signal processing device 500 is 4 (= 1 + 3). That is, when the WSS of n input and m output and the WSS of m input and n output are integrated in the optical signal processing device, the optical signal processing device includes (n + m) SBTs. Therefore, it can be said that the optical signal processing device 500 shown in FIG. 6 integrates a WSS with 1 input and 3 outputs and a WSS with 3 inputs and 1 output.

Four input / output ports are connected to each of SBT # 1 to # 4. The number of input / output ports connected to each SBT represents the number of WSSs (4 = 2k, k = 2) integrated in the optical signal processing device 500. Therefore, the optical signal processing device 500 integrates two WSSs with one input and three outputs (WSS # 1, WSS # 2) and two WSSs with three inputs and one output (WSS # 3, WSS # 4). It can be said that there is. Therefore, of the four input / output ports connected to each SBT, two input / output ports are used for signal light input, and the other two input / output ports are used for signal light output. Each SBT is shared by two signal light inputs and two signal light outputs.

FIG. 7 is a diagram showing an example of allocating inputs and outputs to each input / output port in the optical signal processing device 500 according to the fifth embodiment. In the allocation shown in FIG. 7, at least one input / output port is assigned to the signal light input and at least one input / output port is assigned to the signal light output in each of the input / output port groups # 1 to # 4. Further, in each of the input / output port groups # 1 to # 4, inputs and outputs are alternately assigned to each optical input / output unit. For example, the input / output ports 11, 21, 31, and 41 included in the input / output port group # 1 are assigned to the input of WSS # 1, the output of WSS # 2, the input of WSS # 3, and the output of WSS # 4, respectively. ing. The input / output ports 12, 22, 32, and 42 included in the input / output port group # 2 are assigned to the output of WSS # 1, the input of WSS # 2, the output of WSS # 3, and the input of WSS # 4, respectively. ing.

The operation of the optical signal processing device 500 according to the fifth embodiment will be described. The signal light input from the input / output port 11 of WSS # 1 to SBT # 1 spreads to a desired beam diameter on the slab waveguide, then propagates to the emission end face 501a via the array waveguide, and then propagates to the emission end surface 501a. Is emitted at a specific emission angle. The emitted signal light is wavelength-delimited by the diffraction grating 502 and focused on the region 504a on the LCOS element 504 by the lens 503. The input light of WSS # 1 is focused on the region 504a on the main surface that reflects and deflects the LCOS element 504. The signal light that is given the desired phase modulation in the region 504a of the LCOS element 504 and is reflected is deflected to a desired angle in the XZ plane according to the phase setting of the phase modulation. The reflected signal light passes through the lens 503 and the diffraction grating 502 again, and is coupled to the SBT corresponding to any of the input / output ports 12, 13 and 14 at the same angle as the exit angle to the space. The combined signal light is output from any of the input / output ports 12, 13 and 14, and the switching operation of WSS # 1 is completed.

The signal light input from the input / output ports 21, 22, 23, and 24 constituting the optical input / output unit # 2 passes through SBT # 1, # 2, # 3, and # 4, respectively, and is spatially at the same emission angle. Is emitted to the region 504b on the LCOS element 504. Further, the signal light input from the input / output ports 31, 32, 33, and 34 constituting the optical input / output unit # 3 passes through SBT # 1, # 2, # 3, and # 4, respectively, and has the same emission angle. Is emitted into space and is focused on the region 504c on the LCOS element 504. The signal light input from the input / output ports 41, 42, 43, and 44 constituting the optical input / output unit # 4 passes through SBT # 1, # 2, # 3, and # 4, respectively, and is spatially at the same emission angle. Is emitted to the region 504d on the LCOS element 504.

Since the signal light input from the input / output port 31 of WSS # 3 is emitted into space at an angle different from the angle at which the signal light input from the input / output port 11 of WSS # 1 is emitted into space, the LCOS element. The position of light collection on 504 is different. The signal light input from the input / output port 31 is focused on the region 504c. Since the optical system of the signal light input from the input / output port 11 of WSS # 1 and the optical system of the signal light input from the input / output port 31 of WSS # 3 can be regarded as independent optical systems, the optical signal processing device. The 500 can realize the aggregation of a plurality of WSS functions.

At this time, any of the signal lights input from the three input / output ports assigned to the signal light inputs in WSS # 2 or WSS # 4 is output to the other input / output ports assigned to the signal light outputs. The switching operation to be performed is the same as the switching operation of WSS # 1. The SBT to which the input / output ports assigned to the signal light outputs in WSS # 2 and # 4 are connected is the same as the SBT to which the input / output ports assigned to the signal light inputs in WSS # 1 and # 3 are connected. Is. Further, in the SBT, the signal light input to WSS # 1 and # 3 and the signal light output from WSS # 2 and # 4 are simultaneously propagated in the opposite directions. That is, the input and output allocation of the signal light to each input / output port provided in the plane light wave circuit 501 is different from the allocation to other adjacent input / output ports, and the input allocation and the output allocation are arranged alternately. ..

Regarding the crosstalk that occurs between WSSs due to the angle multiplexing method, the leakage from the signal light propagating in the opposite direction is not superimposed as the crosstalk. Therefore, the optical signal processing device 500 can reduce the number of simultaneous input signals having the same wavelength that contribute to crosstalk, and can reduce the influence of crosstalk that occurs when WSS is integrated.

FIG. 8 is a graph showing the influence of crosstalk between the conventional optical signal processing device and the optical signal processing device according to the present embodiment. In the graph shown in FIG. 8, the horizontal axis represents the wavelength and the vertical axis represents the crosstalk level. The conventional optical signal processing device is an optical signal processing device in which a plurality of WSSs shown in FIG. 16 are integrated. Experiments to measure the effects of crosstalk were performed under the following conditions.

A PLC equipped with nine SBTs connected to seven input / output ports was prepared, and the created PLC was incorporated into a benchtop type spatial optical system equipped with a diffraction grating, a lens, and an LCOS element for measurement. Of the seven WSSs, WSS # 4, which is located at the center, was used as the measurement target. The cumulative level of crosstalk leaking into WSS # 4 was measured when signal light was simultaneously input to other WSS # 1, # 2, # 3, # 5, # 6, and # 7. In the measurement, the allocation of input / output ports in which the signal lights in all WSSs propagate in the same direction in the optical system (condition # 1: conventional configuration) and the input / output ports in which the signal lights in adjacent WSSs propagate in opposite directions (Condition # 2: Configuration of this embodiment) was simulated. That is, the conventional optical signal processing device is a device in which seven 1-input / 8-output WSSs are integrated, and the optical signal processing device of the present embodiment has three 1-input / 8-output WSSs and four 8-inputs 1 It is a device that integrates the output WSS.

In the case of condition # 1, switch control was performed on the LCOS element so that the leaked light to WSS # 4 was output from a specific input / output port, and the spectrum of the leaked light output was measured. At this time, switch control is performed on the LCOS element so that the signal light input from each WSS does not combine with the input / output port to which the leak light is output, and only the leak light to WSS # 4 is measured. I tried to be done.

In the case of condition # 2, signal light is input to WSS # 2 and # 6 in the same direction as in the case of condition # 1, while condition # 1 is applied to WSS # 1, # 3, # 5, and # 7. The signal light was input in the opposite direction to the case of, and the spectrum of the leaked light to WSS # 4 was measured. Under both conditions # 1 and # 2, C-band ASE light is used as signal light, input to one of the input / output ports of WSS # 4, and the optical spectrum output from the other input / output ports is analyzed by an optical spectrum analyzer. Measured in.

The measurement results are as follows. The average value of the crosstalk level under the condition # 1 (conventional) was −29 dB, and the average value of the crosstalk level under the condition # 2 (the present embodiment) was −40 dB. From the measurement results, it can be confirmed that the influence of crosstalk can be reduced by the optical signal processing device according to the present embodiment. The above-mentioned average value of crosstalk is the average value of crosstalk at wavelengths of 1528 nm to 1566 nm. The results shown in FIG. 8 are due to the angle multiplexing method, although the optical signal processing device 500 shown in FIG. 6 integrates the same number of WSSs as compared with the optical signal processing device shown in FIG. Crosstalk can be reduced and deterioration of signal quality can be suppressed.

[Sixth Embodiment]
FIG. 9 is a diagram showing an application example of the optical signal processing device 600 according to the sixth embodiment. FIG. 9 shows an application example in which a part of the conventional ROADM node shown in FIG. 15 is mounted by the optical signal processing apparatus according to the fifth embodiment. The ROADM node shown in FIG. 9 is connected to the input route 601 and the output route 608. The input route 601 and the output route 608 each have N routes. The ROADM node includes an input side WSS group 602, a wavelength demultiplexing unit group 603, a receiver group 604, a transmitter group 605, a wavelength combining unit group 606, and an output side WSS group 607.

In the ROADM node shown in FIG. 9, out of N 1-input L-output (1xL) WSS in the input WSS group, i (1 ≦ i ≦ N) 1-input L-output WSS and an output WSS group. Of the N WSSs of L inputs and 1 output (Lx1) in the above, i (1 ≦ i ≦ N) WSSs of L inputs and 1 output are mounted on the optical signal processing device 600. The optical signal processing device 600 has the same configuration as the optical signal processing device 500 according to the fifth embodiment. In the optical signal processing device 600, the spatial light modulator deflects the signal light for each desired wavelength included in the signal light, and a plurality of signal lights of desired wavelengths are used to emit the signal light among the input / output ports. Performs the operation of connecting to each input / output port. The spatial light modulator performs the above-mentioned operation for each optical input / output unit. That is, the optical signal processing device 600 operates as a wavelength cross-connect function unit.

The operation in the ROADM node shown in FIG. 9 will be described. First, the extraction of signal light in the ROADM node will be described. The WDM signal input from each route of the input route 601 is demultiplexed for each wavelength by the WSS of one input L output in the input side WSS group 602. The 1-input L-output WSS demultiplexes the demultiplexed signal light for each output port corresponding to the switching destination or the extraction destination to generate and output a WDM signal. The WDM signal branched in this way is one of the WSSs of the L input 1 output in the output side WSS group 607 corresponding to each direction, or the controller of the N input M output in the wavelength demultiplexing group 603 corresponding to the extraction destination. It is output to one of the tension WSS. The N input M output contention WSS obtains signal light obtained by demultiplexing the WDM signal received from the 1 input L output WSS for each wavelength, and outputs the signal light to the corresponding receiver in the receiver group 604. ..

Next, the addition of the signal light in the ROADM node will be described. The contention WSS of the M input N output in the wavelength combiner group 606 obtains the signal light input from the transmitter in the transmitter group 605. The contention WSS of M input and N output combines the signal light for each WSS of L input 1 output corresponding to the output destination, and the WDM signal obtained by the combined wave is the L input 1 output of the output side WSS group 607. Output to one of WSS. The WSS with one L input and one output multiplexes the WDM signal received from the WSS with one input L output in the input side WSS group 602 and the WDM signal received from the contention WSS with M input N output to the output route 608. Output.

As described above, the feature of the configuration of the ROADM node according to the sixth embodiment is that i one input L output in the input side WSS group 602 is compared with the configuration of the conventional ROADM node shown in FIG. The point is to use an optical signal processing device 600 that integrates the WSS of the above and the WSS of i L inputs and 1 output in the output side WSS group 607. This is a configuration in which a plurality of WSSs are integrated in one module. By applying the ROADM node according to the sixth embodiment, many effects such as reduction of initial introduction cost of input side WSS group 602 and output side WSS group 607, reduction of power consumption, and reduction of load of control system can be obtained. .. In addition, the ROADM node according to the sixth embodiment can suppress signal quality deterioration due to crosstalk that occurs between WSSs due to integration.

[7th Embodiment]
FIG. 10 is a diagram showing an application example of the optical signal processing device 700 according to the seventh embodiment. FIG. 10 shows an application example in which a part of the conventional ROADM node shown in FIG. 15 is mounted by the optical signal processing apparatus according to the fifth embodiment. The ROADM node shown in FIG. 10 is connected to the input route 601 and the output route 608. The input route 601 and the output route 608 each have N routes. The ROADM node includes an input side WSS group 602, a wavelength demultiplexing unit group 603, a receiver group 604, a transmitter group 605, a wavelength combining unit group 606, and an output side WSS group 607. In the ROADM node shown in FIG. 10, out of the WSS of K N input M outputs in the wavelength demultiplexing unit group 603, the WSS of i (1 ≦ i ≦ K) N input M outputs and the wavelength combining part group. Of the K WSSs with M inputs and N outputs in 606, i (1 ≦ i ≦ K) WSSs with M inputs and N outputs are mounted on the optical signal processing device 700. The optical signal processing device 700 has the same configuration as the optical signal processing device 500 according to the fifth embodiment. That is, the optical signal processing device 700 operates as an Add / Drop function unit.

Since the operation at the ROADM node in the present embodiment is the same as the operation at the ROADM node in the sixth embodiment, the description of the operation will be omitted.

As described above, the feature of the configuration of the ROADM node according to the seventh embodiment is that i N input Ms in the wavelength demultiplexing unit group 603 are compared with the configuration of the conventional ROADM node shown in FIG. The point is to use an optical signal processing device 700 that integrates the output WSS and the i WSSs of M inputs and N outputs in the wavelength combiner group 606. This is a configuration in which a plurality of WSSs are integrated in one module. By applying the ROADM node according to the seventh embodiment, many effects such as reduction of the initial introduction cost of the wavelength demultiplexing unit group 603 and the wavelength combining unit group 606, reduction of power consumption, and reduction of the load of the control system can be obtained. can get. Further, the ROADM node according to the seventh embodiment can suppress signal quality deterioration due to crosstalk that occurs between WSSs due to integration.

[8th Embodiment]
In the following, among the plurality of transmission lines connected to the spatial multiplexing optical node, the transmission line having the same connection destination node is treated as one direction, and each of the plurality of transmission lines in one direction is treated as a spatial mode. For example, when one route is constructed by using a plurality of single-mode fibers, the unit of spatial mode is single-mode fiber. When one route is constructed by using one or a plurality of multi-core fibers, the unit of the spatial mode is the core of the multi-core fiber. A spatial multiplex optical node is an optical node having input / output ports connected to each route and each spatial mode. The ROADM node is an example of a spatial multiplexing optical node.

FIG. 11 is a diagram showing an application example of the optical signal processing device 800 according to the eighth embodiment. FIG. 11 shows an application example in which a part of the spatial multiplexing optical node shown in FIG. 12 is mounted by the optical signal processing device 800. FIG. 12 is a diagram showing a configuration of a spatial multiplexing optical node to which the optical signal processing device 800 is applied. The spatial multiplex optical node shown in FIG. 12 is connected to an input route 801 including N routes and an output route 803 including N routes. Each of the routes included in the input route 801 and the output route 803 has S spatial modes. The input route 801 and the output route 803 are configured by using a plurality of spatial multiplexing fibers such as a single mode fiber or a multi-core fiber. The spatial multiplex optical node includes N × S input ports for connection with the input route 801 and N × S output ports for connection with the output route 803.

The spatial multiplexing optical node includes S wavelength cross-connects 802 (802-1 to 802-S). The input route 801 and the output route 803 are connected to the wavelength cross-connects 802 to 802-S. The wavelength cross connect 802 is provided for each spatial mode. Each wavelength cross-connect 802 includes an input-side WSS group including N 1-input L-output (1xL) WSS and an output-side WSS group including N L-input 1-output (Lx1) WSS. .. That is, the spatial multiplexing optical node has N × S input ports and N × S output ports by providing S wavelength cross-connects 802 having N input ports and N output ports. Be prepared.

The N 1-input L-output WSSs provided in the wavelength cross-connect 802 are each connected to the N input paths of the corresponding spatial modes. Each 1-input L-output WSS inputs signal light from the connected input route. The N L inputs and 1 output WSS are connected to the N output routes of the corresponding spatial modes, respectively. Each L input and 1 output WSS outputs signal light to the connected output route. In the spatial multiplexing optical node shown in FIG. 12, since the wavelength cross-connects 802 are independent, the signal light is not switched between the spatial modes.

The WDM signal input to the spatial multiplexing optical node is input to the wavelength cross-connect 802 corresponding to the spatial mode of the WDM signal. The WDM signal is input to the 1-input L-output WSS corresponding to the direction of the WDM signal in the WSS group on the input side provided in the wavelength cross-connect 802. The 1-input L-output WSS selects a drop route to its own node or a through route to an adjacent node for each wavelength of the input WDM signal. When the drop route to the own node is selected by the WSS group on the input side, the signal light is received by a predetermined receiver in the receiver group via the wavelength demultiplexing unit group.

The signal light for which the through route to the adjacent node is selected in the WSS group on the input side is sent to the WSS of any L input 1 output (Lx1) included in the WSS group on the output side in the same wavelength cross connect 802. Entered. The signal light input to the WSS of L input 1 output is transmitted to the adjacent node via the transmission line connected to the WSS of L input 1 output. Further, the signal light output from the transmitter group provided in the spatial multiplexing optical node is input to the L input 1 output WSS included in the WSS group on the output side via the wavelength division multiplexing unit group. The signal light output from the transmitter group is also transmitted to the adjacent node via the output route connected to the WSS of L input 1 output.

In the spatial multiplexing optical node in the eighth embodiment, among the WSSs included in the input side WSS group and the output side WSS group provided in each of the S wavelength cross-connects 802, they are connected to the same input direction. A WSS with 1 input and L output and a WSS with 1 input and 1 output connected to the same output route are mounted in one optical signal processing apparatus 800. The optical signal processing device 800 is connected to the same output direction as the i (1 ≦ i ≦ S) WSS of 1 input L output among the S 1 input L output WSS connected to the same input direction. Of the S WSSs with L inputs and 1 output, i WSSs with L inputs and 1 output may be provided. The optical signal processing device 800 integrates i WSSs with 1 input and L output and WSSs with i L inputs and 1 output. The i integrated WSSs of 1 input L output are WSSs on the input side having the same connection destination node (input direction) but different spatial modes. The i WSSs with one L input and one output that are integrated are WSSs on the output side that have the same connection destination node (output route) but different spatial modes.

For example, the optical signal processing device 800 includes a planar light wave circuit, a diffraction grating, a lens, and an LCOS element, similarly to the optical signal processing device 500 according to the fifth embodiment. In the optical signal processor 800, the LCOS element as a spatial light modulator deflects the signal light for each desired wavelength contained in the signal light. The plurality of deflected signal lights are output to the outside by being coupled to the input / output ports used for emitting the signal light among the plurality of input / output ports formed in the planar light wave circuit. The spatial light modulator performs the above-described operation for each optical input / output unit including a plurality of input / output ports. That is, the optical signal processing device 800 operates as a wavelength cross-connect connected to an input route and an output route having a plurality of spatial modes.

In the configuration example shown in FIG. 11, the optical signal processing device 800 has one input L output WSS # 1 to # N and an L input one output WSS # 1 to # N provided for each of the wavelength cross-connects 802. Includes S 1-input L-output WSS # 1 and S L-input 1-output WSS # 1. The configuration example shown in FIG. 11 shows a case where the optical signal processing device 800 includes a plurality of WSS # 1 on the input side and a plurality of WSS # 1 on the output side. A configuration may include a plurality of WSSs connected to the same input route other than WSS # 1 and a plurality of WSSs connected to the same output route other than WSS # 1.

As shown in the sixth embodiment, of the WSS group on the input side and the WSS group on the output side provided in one wavelength cross-connect 802, i (1 ≦ i ≦ N) WSS of 1 input L output and When i WSSs with L input and 1 output are mounted on the optical signal processing device 600, a communication failure occurs in a plurality of input routes and a plurality of output routes when the optical signal processing device 600 fails. On the other hand, when the optical signal processing device 800 according to the eighth embodiment shown in FIG. 11 is used for the spatial multiplexing optical node, the input route in which a communication failure occurs even if the optical signal processing device 800 fails. The number and the number of output routes can be reduced to one each. Even if the optical signal processing device 800 fails, the communication failure does not occur over the plurality of input routes and the plurality of output routes, so that the reliability of the spatial multiplexing optical node can be improved. Since the number of connection destination nodes of the input route and the number of connection destination nodes of the output route connected to the optical signal processing device 800 are set to one, the optical signal processing device 800 can be repaired and replaced for each route. It is possible.

As described above, the spatial multiplexing optical node according to the eighth embodiment has the same input direction as the input side WSS group and the output side WSS group provided for each wavelength cross-connect 802. It is characterized by a configuration using an optical signal processing device 800 that integrates the WSS of the above and the WSS of the output side having the same output route. The connection destination nodes (input directions) of the input / output ports that input signal light from adjacent nodes of the input / output ports of the optical signal processing device 800 are the same, and the signal light is sent to the adjacent nodes of the input / output ports. The optical signal processing device 800 has a configuration in which a plurality of WSSs having the same connection destination node (output route) for each output input / output port and the same input route and a plurality of WSSs having the same output route are integrated. Be prepared. By applying the optical signal processing device 800 to the spatial multiplexing optical node, maintenance of each route is possible, while suppressing the initial introduction cost of the WSS group connected to the same route, reducing the power consumption, and controlling the control system. Many effects such as load reduction can be obtained. Further, the optical signal processing device 800 can suppress deterioration of signal quality due to crosstalk occurring between WSSs even when a plurality of WSSs are integrated.

[9th Embodiment]
FIG. 13 is a diagram showing an application example of the optical signal processing device 900 according to the ninth embodiment. FIG. 13 shows an application example in which a part of the spatial multiplexing optical node shown in FIG. 14 is mounted by the optical signal processing device 900. FIG. 14 is a diagram showing a configuration of a spatial multiplexing optical node to which the optical signal processing device 900 is applied. The spatial multiplex optical node shown in FIG. 14 is connected to an input route 901 including (N-2) routes and an output route 903 including (N-2) routes. Each of the routes included in the input route 901 and the output route 903 has S spatial modes. The input route 901 and the output route 903 are configured by using a plurality of spatial multiplexing fibers such as a single mode fiber or a multi-core fiber. The spatial multiplex optical node is provided with (N-2) x S input ports for connection with the input route 901 and (N-2) x S outputs for connection with the output route 903. It has a port.

The spatial multiplexing optical node includes S wavelength cross-connecting 902 (902-1 to 902-S) similar to the configuration of the spatial multiplexing optical node shown in FIG. The input route 901 and the output route 903 are connected to the wavelength cross-connects 902 to 902-S. The wavelength cross connect 902 is provided for each spatial mode. Each wavelength cross-connect 902 includes an input-side WSS group including N 1-input L-output (1xL) WSS and an output-side WSS group including N L-input 1-output (Lx1) WSS. .. That is, the spatial multiplexing optical node has N × S input ports and N × S output ports by providing S wavelength cross-connects 802 having N input ports and N output ports. Be prepared.

Of the N 1-input L-output WSSs provided in the wavelength cross-connect 902, (N-2) 1-input L-output WSSs are connected to the N input routes of the corresponding spatial modes, respectively. Each 1-input L-output WSS inputs signal light from the connected input route. Of the N WSSs with L inputs and 1 output, (N-2) WSSs with 1 L input and 1 output are connected to (N-2) output routes in the corresponding spatial modes. Each L input and 1 output WSS outputs signal light to the connected output route. In the spatial multiplexing optical node of the ninth embodiment, the wavelength cross-connect 902 is connected to another wavelength cross-connect 902. The WSS with one L input and one output of the wavelength cross connect 902 is connected to the WSS with one input and one output of the other wavelength cross connect 902.

In the examples shown in FIGS. 13 and 14, the output of WSS # N having L input and 1 output provided in the wavelength cross connect 902-1 is the input of WSS # 1 having 1 input L output provided in wavelength cross connect 902-2. Connected to. The output of WSS # 1 with L input and 1 output provided in the wavelength cross connect 902-2 is connected to the input of WSS # N with 1 input and L output provided in the wavelength cross connect 902-1. Further, the output of WSS # 1 having one L input and one output provided in the wavelength cross connect 902-1 is connected to the input of WSS # N having one input and one output provided in the wavelength cross connect 902-S. The output of WSS # N of L input 1 output provided in the wavelength cross connect 902-S is connected to the output of WSS # 1 of L input 1 output provided in the wavelength cross connect 902-1.

In this way, the wavelength cross-connect 902-1 is connected to the other two wavelength cross-connects 902-2 and 902-S. Wavelength cross-connect 902 other than wavelength cross-connect 902-1 is also connected to the other two wavelength cross-connect 902 in the same manner. By connecting each wavelength cross-connect 902 to two other adjacent wavelength cross-connects 902, the spatial multiplexing optical node crosses the WDM signal input to each wavelength cross-connect 902 into one or more wavelength cross-connects. It can be output to the output route 903 in any spatial mode via the connect 902.

The WDM signal input to the spatial multiplexing optical node is input to the wavelength cross-connect 902 corresponding to the spatial mode of the WDM signal. The WDM signal is input to the 1-input L-output WSS corresponding to the input route of the WDM signal in the WSS group on the input side provided in the wavelength cross-connect 902. The 1-input L-output WSS selects one of the following routes for each wavelength of the input WDM signal: drop to its own node, through to an adjacent node, or through to another wavelength cross-connect 902. ..

When the drop route to the own node is selected by the WSS group on the input side, the signal light is received by a predetermined receiver in the receiver group via the wavelength demultiplexing unit group. When a through route to an adjacent node is selected in the WSS group on the input side, the signal light is WSS # 2 to # (WSS # 2 to # of L input 1 output included in the WSS group on the output side in the same wavelength cross connect 902. It is output to any of N-1). Further, the signal light output from the transmitter group provided in the spatial multiplexing optical node is input to the L input 1 output WSS included in the WSS group on the output side via the wavelength division multiplexing unit group. The signal light input to the WSS # 2 to # (N-1) of the L input 1 output is transmitted to the adjacent node via the output route connected to the WSS of the L input 1 output.

When a through route to another wavelength cross-connect 902 is selected in the WSS group on the input side, the signal light is WSS # of L input 1 output included in the WSS group on the output side in the same wavelength cross-connect 902. It is output to either 1 or #N. The signal light input to WSS # 1 of L input 1 output is input to WSS # N of 1 input L output of another adjacent wavelength cross connect 902. The signal light input to WSS # N with L input and 1 output is input to WSS # 1 with 1 input and L output of another adjacent wavelength cross-connect 902.

In the spatial multiplexing optical node in the ninth embodiment, of the WSS included in the input side WSS group and the output side WSS group provided for each of the S wavelength cross-connects 902, the connection destination node is the same one input. A WSS with L output and a WSS with L input and 1 output having the same connection destination node are mounted in one optical signal processing apparatus 900. The optical signal processing device 900 is connected to the same output direction as the i (1 ≦ i ≦ S) WSS of 1 input L input among the S WSS of 1 input L input connected to the same input direction. Of the S WSSs with L inputs and 1 output, i WSSs with L inputs and 1 output may be provided. The optical signal processing device 900 integrates i WSSs with 1 input and L output and WSSs with i L inputs and 1 output. The i integrated WSSs with 1 input and L output are WSSs on the input side with the same connection destination node but different spatial modes. The i WSSs with one L input and one output that are integrated are WSSs on the output side that have the same connection destination node but different spatial modes.

For example, the optical signal processing device 900 includes a planar light wave circuit, a diffraction grating, a lens, and an LCOS element, similarly to the optical signal processing device 500 according to the fifth embodiment. In the optical signal processor 900, the LCOS element as a spatial light modulator deflects the signal light for each desired wavelength contained in the signal light. The plurality of deflected signal lights are output to the outside by being coupled to the input / output ports used for emitting the signal light among the plurality of input / output ports formed in the planar light wave circuit. The spatial light modulator performs the above-described operation for each optical input / output unit including a plurality of input / output ports. That is, the optical signal processing device 900 operates as a wavelength cross-connect connected to an input route and an output route having a plurality of spatial modes.

In the configuration example shown in FIG. 13, the optical signal processing device 900 has one input L output WSS # 1 to # N and an L input one output WSS # 1 to # N provided for each of the wavelength cross-connects 902. Includes S 1-input L-output WSS # 1 and S L-input 1-output WSS # 1. The configuration example shown in FIG. 13 shows a case where a plurality of WSSs connected to the own node among the WSS group on the input side and the WSS group on the output side are mounted by one optical signal processing device 900. The WSS included in the optical signal processing device 900 may be a WSS other than WSS # 1. For example, among the WSS group on the input side and the WSS group on the output side, a plurality of WSSs connected to the same route among the routes to adjacent nodes may be mounted on the optical signal processing device 900.

As shown in the sixth embodiment, of the WSS group on the input side and the WSS group on the output side provided in one wavelength cross-connect 902, i (1 ≦ i ≦ N) of WSS with one input L output and When i WSSs with L input and 1 output are mounted on the optical signal processing device 600, a communication failure occurs in a plurality of input routes and a plurality of output routes when the optical signal processing device 600 fails. On the other hand, when the optical signal processing device 900 according to the ninth embodiment shown in FIG. 13 is used for the spatial multiplexing optical node, the input route in which a communication failure occurs even if the optical signal processing device 900 fails. The number and the number of output routes can be reduced to one each. Even if the optical signal processing device 900 fails, the communication failure does not occur over the plurality of input routes and the plurality of output routes, so that the reliability of the spatial multiplex optical node can be improved. Since the number of connection destination nodes of the input route and the number of connection destination nodes of the output route connected to the optical signal processing device 900 are set to one, the optical signal processing device 900 can be repaired and replaced for each route. It is possible.

As described above, in the spatial multiplexing optical node according to the ninth embodiment, among the WSS group on the input side and the WSS group on the output side provided in each of the wavelength cross-connect 902, the connection destination node is the same input side. It is characterized by a configuration using an optical signal processing device 900 in which the WSS of the above and the WSS of the output side having the same connection destination node are integrated. Of the input / output ports of the optical signal processing device 900, the connection destination nodes of the input / output ports that input signal light are the same, and the connection destination nodes of the input / output ports that output signal light are the same. The optical signal processing device 900 includes a plurality of WSSs having the same input connection destination node and a plurality of WSSs having the same output connection destination node. By applying the optical signal processing device 900 to the spatial multiplexing optical node, maintenance for each route and switching of signal light between spatial modes become possible. Further, by applying the optical signal processing device 900 to the spatial multiplexing optical node, many effects such as reduction of the initial introduction cost of the WSS group connected to the same route, reduction of power consumption, and reduction of the load of the control system can be obtained. Be done. Further, the optical signal processing device 900 can suppress deterioration of signal quality due to crosstalk occurring between WSSs even when a plurality of WSSs are integrated.

As described in each embodiment, the optical signal processing device includes a plurality of optical input / output units, a condensing unit (for example, a lens), and a spatial light modulation unit (for example, an LCOS element or a MEMS element). Each optical input / output unit has a plurality of input / output ports for inputting / outputting signal light. The condensing unit collects the signal light input to the input / output port on the reflecting surface of the spatial light modulation unit. The spatial light modulation unit deflects and reflects the signal light collected by the condensing unit. The traveling direction of the signal light input to the plurality of input / output ports to the condensing unit differs for each optical input / output unit. The position in the spatial light modulation section where the signal light input to the plurality of input / output ports is collected by the light collecting section differs for each optical input / output section. By having the above-described configuration, the optical signal processing device can operate as an independent WSS for each optical input / output unit.

Further, in an optical signal processing device, a set of input / output ports that are input / output ports included in different optical input / output units and input / output signal light input / output to / from the spatial optical modulation unit at the same angle is a group of input / output ports. Then, in the input / output port group, at least one input / output port is used for inputting signal light, and at least one other input / output port is used for outputting signal light. By using the input / output ports in this way, the optical signal processing device can reduce the number of signal lights propagating in the optical system in the same direction, and can reduce the influence of crosstalk.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention.

The present invention can also be applied to applications in which it is indispensable to suppress deterioration of communication quality due to crosstalk caused in the optical system due to the angle multiplexing method.

1, 2, ... Optical input / output unit 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43, 44 ... Input / output ports 100, 200, 300, 400 , 500, 600, 700, 800, 900 ... Optical signal processing device 101, 102 ... Microlens array 103, 503 ... Lens 104 ... Spatial optical modulator 104a, 104b, 504a, 504b, 504c, 504d ... Region 201, 301, 501 ... Plane light wave circuit 201a, 301a, 501a ... Emission end face 311, 312, 313 ... Slab waveguide 401, 502 ... Diffraction grating 504 ... LCOS element 601, 801, 901 ... Input route 602 ... Input side WSS group 603 ... Wavelength Demultiplexing part group 604 ... Receiver group 605 ... Transmitter group 606 ... Wavelength combining part group 607 ... Output side WSS group 608, 803, 903 ... Output direction 802, 902 ... Wavelength cross-connect

Claims (8)

A plurality of optical input / output units having a plurality of ports for inputting / outputting signal light,
A condensing unit that condenses the signal light input to the port,
A spatial light modulator that deflects the signal light collected by the condensing unit, and
With
The traveling direction of the signal light input to the plurality of ports to the condensing unit differs for each optical input / output unit.
The position in the spatial light modulation unit where the signal light input to the plurality of ports is collected by the condensing unit differs for each optical input / output unit.
When a set of ports that are included in different optical input / output units and input / output signal light that enters / outputs / outputs to / from the spatial light modulation unit at the same angle is defined as a port group, each of the port groups each takes half of the ports is used to output the signal light input and signal light,
In each of the port groups, the port and the signal light that input the signal light so that the propagation directions of the signal light in the optical input / output unit adjacent to the spatial light modulation unit are opposite to each other. The ports that output the light are arranged alternately.
Optical signal processing device. The optical signal processing device according to claim 1, wherein the optical input / output unit is formed in a planar light wave circuit. The plane light wave circuit is
A slab waveguide provided for each port group and connected to the port included in the port group,
An array waveguide provided for each slab waveguide and connected to the slab waveguide,
Including
The signal light input to the port is emitted from the array waveguide toward the condensing unit.
The optical signal processing device according to claim 2. The spatial light modulation unit has an LCOS (Liquid Crystal on Silicon) element.
The optical signal processing apparatus according to any one of claims 1 to 3. A spectroscopic unit that demultiplexes the signal light toward the condensing unit for each wavelength is further provided.
Each of the signal lights demultiplexed for each wavelength is collected at different positions in the spatial light modulation unit by the condensing unit.
The optical signal processing apparatus according to any one of claims 1 to 4. The spatial light modulation unit deflects the signal light for each desired wavelength included in the signal light, and couples a plurality of the signal lights of the desired wavelength to the ports used for the output of the signal light among the ports. ,
The optical signal processing device according to claim 5. When the number of the ports possessed by each of the optical input / output units is N (N is an integer of 2 or more)
In at least one optical input / output unit, m (m is a natural number of N-1 or less) of the ports is used for inputting signal light, and n (n = Nm) of the ports of signal light. Used for output
In the other optical input / output unit, the n ports are used for inputting signal light, and the m ports are used for outputting signal light.
The optical signal processing apparatus according to claim 5 or 6. Of the plurality of ports, the port to which the signal light is input receives the signal light from the same node.
Of the plurality of ports, the port that outputs the signal light outputs the signal light to the same node.
The optical signal processing apparatus according to any one of claims 1 to 7.

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