JP2019113770A - Optical signal processing device and optical cross-connection device - Google Patents

Abstract

To switch a route of an optical signal while suppressing crosstalk.SOLUTION: Signal light emitted from an input port 101-m of WSS#m is made incident on a spatial optical modulating element 106 through a lens 103 and a lens 105. At this time, the signal is demultiplexed to be diffracted at different angles by wavelengths through a wavelength dispersing element 104, and then converged on different places of the spatial optical modulating element 106. The light made incident on the spatial optical modulating element 106 is reflected and modulated in diffraction angle. The signal light from the input port 101-m that the spatial optical modulating element 106 reflects is multiplexed by the wavelength dispersing element 104 through the lens 105. The signal light from the input port 101-m that the wavelength dispersing element 104 multiplexes is input by the lens 103 to different convergence points spatially apart from signal light from other input ports at angles corresponding to output ports 102-m-1 to 102-m-N respectively and coupled with output ports corresponding to the angles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical signal processing device and an optical cross connect device.

  With the spread of the Internet, the demand for data communication networks is explosively increasing, and the demand for large capacity and flexible customization functions for the optical communication networks that support this is growing. In response to the demand for such optical communication networks, wavelength division multiplexing (WDM) communication has been put to practical use from the viewpoint of increasing the capacity. In this practical application, a 1-input N-output (or N-input 1-output) wavelength selective switch (WSS: Wavelength) has a switching function to select a route for each WDM signal wavelength from the viewpoint of a flexible customization function. Selective Switch has been developed. Such a WSS is also referred to below simply as "WSS". Also, the 1-input N-output WSS is called “1 × N WSS”, and the N-input 1-output WSS is called “N × 1 WSS”.

  Also, when constructing a wavelength cross connect (WXC), when low crosstalk (XT) is required, a Route & Select (R & S) configuration in which WSS is passed through two stages is taken. Since R & S WXC requires many WSS, research and development of Nin1 WSS, which realizes multiple WSS in one module, is in progress.

K. Seno, K. Suzuki, N. Ooba, T. Watanabe, M. Itoh, T. Sakamoto, T. Takahashi, "Spatial beam transformer for wavelength selective switch consistent of silica-based planar lightwave circuit," Optical Fiber Communication Conference , OSA Technical Digest (Optical Society of America, 2012), paper JTh2A.5 Keita Yamaguchi, Mitsumasa Nakajima, Yuichiro Ikuma, Kazunori Seno, Osamu Moriwaki, Kenya Suzuki, Mikitaka Itoh, Mitsunori Fukutoku, Yutaka Miyamoto and Toshikazu Hashimoto, “Route-and-Select Type Wavelength Cross for Core-Shuffling of 7-Core MCFs with Spatial and Planar Optical Circuit, "in Proc. ECOC (2016), p.752-754 M. Filer and S. Tibuleac, "N-degree ROADM Architecture Comparison: Broadcast-and-Select versus Route-and-Select in 120 Gb / s DP-QPSK Transmission Systems," Optical Fiber Communication Conference (OFC) 2014, OSA Technical Digest (Optical Society of America, 2014), paper Th1I.2

  As a method of realizing the above-mentioned Nin1 WSS, one using a spatial beam transformer (SBT) (for example, see non-patent document 1), which is a type of optical waveguide, as a light input / output unit to space is studied and reported. (For example, refer to nonpatent literature 2). The Nin1 WSS using such SBT is the same as the conventional WSS except that the input / output unit for spatial light of signal light is an optical waveguide having a mechanism made at a plurality of angles corresponding to each WSS. It is possible to integrate multiple WSSs at high density while having the optical system of

  FIG. 8 is a diagram schematically showing the operation of the conventional 1 × N WSS. In this WSS, crosstalk (crosstalk in WSS) due to leakage of signal light to unintended ports due to high-order diffracted light due to a spatial light modulator (spatial phase modulator) is a factor of deterioration of signal characteristics. The On the other hand, FIG. 9 is a diagram schematically showing the operation of Nin1 WSS using SBT. In the Nin1 WSS shown in the figure, in addition to the crosstalk in the WSS, unintended stray light generated in the circuit of the optical waveguide causes leakage into the waveguide, which causes crosstalk of optical signals. A plurality of WSSs included in the Nin1 WSS shown in the figure share the same optical circuit, and crosstalk of optical signals occurs between different WSSs due to crosstalk of optical signals in the optical circuit (crossing between WSSs) Talk).

  FIG. 10 is a diagram showing the configuration of the SBT. In addition, even when the same function as that of SBT shown in FIG. 10 is realized with a lens and an optical fiber instead of SBT as shown in FIG. 11, optical signals input to and output from a plurality of different WSS converge at the same location. Cross talk between WSS occurs between these WSS. In this type of cross-WSS crosstalk, Route & Select (R & S) configuration (wavelength cross connect: WXC) that connects multiple input ports and multiple output ports by passing WSS in two stages For example, in the case of Non-Patent Document 3), the problem becomes remarkable.

  FIG. 12 is a diagram showing a WXC of an R & S configuration using Nin1 WSS and Min1 WSS. In the figure, the switching when focusing on a certain wavelength is indicated by a thick arrow. In the R & S configuration, an arbitrary input port and an arbitrary output port are connected through another WSS on the input side and the output side. At that time, the influence of light leakage (cross talk in WSS) between the ports of each WSS can be suppressed by passing the WSS in two stages. On the other hand, since the optical signal leaked out due to the crosstalk between WSS in the Min1 WSS is directly connected to the other connection destination, the signal light leaks to the unintended connection destination, leading to deterioration of the signal characteristics.

  In addition, the same problem occurs in the same way in optical cross connect (OXC) which does not handle WDM signals. In that case, cross-switch crosstalk becomes an issue in the same way even if Nin1 WSS is considered as an Nin1 optical switch.

  In view of the above circumstances, the present invention aims to provide an optical signal processing apparatus and an optical cross connect apparatus capable of switching the route of an optical signal while suppressing crosstalk.

  One aspect of the present invention includes a plurality of optical switch function units, and the optical switch function unit includes one or more input ports for inputting light from the outside, one or more output ports for outputting light to the outside, and a plurality of them. And a spatial light modulation element that modulates and reflects the diffraction angle of the light emitted from the input port and incident through the plurality of lenses, and each of the light switch function units The light emitted from the input port and the light reflected by the spatial light modulation element and incident on the output port through the plurality of lenses intersect at one condensing point, and the condensing point is The optical signal processing device is different for each of the plurality of optical switch function units, and part or all of the spatial light modulation element and the plurality of lenses are shared by the plurality of optical switch function units.

  One embodiment of the present invention is the above-described optical signal processing device, which is a wavelength dispersive element that divides the light so as to diffract at different angles for each wavelength so that the position incident on the spatial light modulation element is different. The plurality of output ports included in the same optical switch function unit may have different incident angles, and the spatial light modulator may be configured to divide the wavelength dispersive element into different positions for each wavelength. The diffraction angle of each light is modulated and reflected, and in each of the optical switch function units, the light emitted from the input port and the spatial light modulation element are reflected, and a plurality of light is transmitted via the plurality of lenses. The branched light incident on each of the output ports intersects at one of the focusing points.

  One embodiment of the present invention is the above-described optical signal processing device, wherein the optical switch function unit further includes a condenser lens, and in each of the optical switch function units, the light emitted from the input port and The light reflected by the spatial light modulation element and incident on the output port through the plurality of lenses is transmitted through the condensing lens between the input port and the output port and the plurality of lenses. Intersect at one of the focusing points.

  One aspect of the present invention is the above-described optical signal processing device, wherein, in each of the optical switch function units, the light emitted from the input port to the plurality of lenses and the plurality of lenses through the plurality of lenses The light incident on the output port intersects at one of the focusing points via the same Spatial Beam Transformer circuit.

  One aspect of the present invention is an optical cross-connect device including one or more of the optical signal processing devices according to any one of the above-described items, wherein the inputted light whose route is to be changed is the same optical signal processing device It passes through the optical switch functions of each of the different optical switch functions or the different optical signal processing devices.

  According to the present invention, it is possible to switch the route of an optical signal while suppressing crosstalk.

It is the schematic of a structure of Min1 optical switch by 1st Embodiment of this invention. It is the schematic of a structure of Min1 optical switch by the embodiment. It is the schematic of a structure of Min1 optical switch by the embodiment. It is a figure which shows the outline of the optical system from the input-output port of each WSS of Min1 WSS in 2nd Embodiment to a condensing point. It is a figure which shows the outline of the optical system from the input-output port of each WSS of Min1 WSS in 3rd Embodiment to a condensing point. It is the schematic of a structure of the optical cross connect apparatus in 5th Embodiment. It is the schematic of a structure of the optical system of the optical cross connect apparatus in the embodiment. It is a figure which shows typically operation | movement of conventional 1xN WSS. It is a figure which shows typically operation | movement of Nin1 WSS using the conventional SBT. It is a figure which shows the conventional SBT. It is a figure which shows the example which comprised the fiber and the lens the function similar to conventional SBT. It is a figure which shows WXC of R & S structure using the conventional Nin1 WSS and Min1 WSS.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present embodiment relates to an optical signal processing apparatus and an optical cross connect apparatus used for space multiplex optical communication. The optical signal processing device and the optical cross connect device of the present embodiment suppress the crosstalk between WSSs of Nin1 WSS, which becomes a problem when configuring the conventional R & S WXC. In the respective embodiments, the same parts are denoted by the same reference numerals, and redundant description will be omitted.

First Embodiment
FIG. 1 is a schematic view of the configuration of the Min 1 optical switch 10 in the first embodiment. The Min1 optical switch 10 is an example of an optical signal processing device. The Min1 optical switch 10 shown in the figure can be regarded as an apparatus in which M 1 × N WSSs (optical switch function units) are integrated. The Min1 optical switch 10 includes M input ports 101, M × N output ports 102, a lens 103, a wavelength dispersive element 104, a lens 105, and a spatial light modulator 106 (M and N are integers of 1 or more) . The input port 101 is a port for inputting light to be changed in route from the outside and emitting the light to the inside of the Min 1 optical switch 10. The output port 102 is a port that outputs the light whose direction is changed in the Min 1 optical switch 10 to the outside. The spatial light modulator 106 is, for example, liquid crystal on silicon (LCOS).

  Among the M 1 × N WSSs in which the Min1 optical switch 10 is integrated, the m-th (m is an integer not less than 1 and no greater than 1) is described as WSS # m, and the input port 101 of WSS # m is the input port 101 The N output ports 102 of -m, WSS # m are described as output ports 102-m-1 to 102-m-N. The input port 101-m, the output ports 102-m-1 to 102-m-N, the lens 103, the wavelength dispersive element 104, the lens 105, and the spatial light modulator 106 correspond to WSS # m. In the case of the Min 1 optical switch 10 shown in the figure, the WSS # 1 to WSS #M share the lens 103, the wavelength dispersive element 104, the lens 105, and the spatial light modulator 106.

  The WDM signal light input to the input port 101-m is emitted from the input port 101-m and enters the spatial light modulator 106 via the lens 103 and the lens 105. At this time, the WDM signal light is demultiplexed so as to be diffracted at different angles for each wavelength by the wavelength dispersive element 104, and is condensed at different locations of the spatial light modulator 106. The light incident on the spatial light modulation element 106 is reflected and the diffraction angle is modulated, the light is dispersed by the wavelength dispersive element 104 through the lens 105, and the signal light is emitted from the input port 101-m by the lens 103. Light is collected at a passing point (light collecting point Pm) at an angle different from that at the time of input. The signal light is coupled to the output ports 102-m-1 to 102-m-N according to the angle. At this time, optical signals input to and output from input ports 101-1 to 101-M and output ports 102-1 to 102-MN connected to different WSSs are input / output from spatially separated positions. The aforementioned focusing points are also spatially separated.

  The operation of the Min 1 optical switch 10 is shown in more detail. The WDM signal light input to the input port 101-m of WSS # m (m is an integer from 1 to M) is different from the input port 101 to a different WSS # j (j ≠ m, j is an integer from 1 to M). Similar to the signal light input to j, the light beam is incident on the spatial light modulator 106 through the lens 103 and the lens 105. At this time, the WDM signal light is demultiplexed so as to be diffracted at different angles for each wavelength by the wavelength dispersive element 104, and is condensed at different locations of the spatial light modulator 106. Specifically, in the XYZ coordinate system shown in FIG. 1, the light is collected at different positions in the Y-axis direction. The WDM signal light emitted from the input port 101-m is incident on the wavelength dispersive element 104 at a different angle because the WDM signal light emitted from the input port 101-j is incident on a different position of the lens 103. In addition, since light is output from a place spatially separated from the signal light from the input port 101-j, the signal light from the input port 101-m is space with the signal light from the input port 101-j. The light is incident on the light modulation element 106 at different positions in the X-axis direction.

  The light incident on the spatial light modulator 106 is reflected and its diffraction angle is modulated. The diffraction angle when light is reflected in the spatial light modulator 106 can be controlled by the conventional technique, and is controlled according to the output destination. The signal light from the input port 101-m reflected by the spatial light modulator 106 is transmitted to the same output port 102-m-n (n is an integer of 1 or more and N or less) by the wavelength dispersive element 104 via the lens 105. It is multiplexed for each incident light. The signal light from the input port 101-m, which is multiplexed by the wavelength dispersive element 104, is output to a different condensing point Pm spatially separated from the signal light emitted from the input port 101-j by the lens 103. The signals are input at angles according to each of 102-m-1 to 102-m -N, coupled to output ports 102-m-1 to 102-m -N according to the angle, and output to the outside.

  In this manner, in the present embodiment, the optical system is divided into 4 f and the waveguides are divided for each WSS to spatially separate the signal light input / output to the input / output port of each WS1 of the Min1 WSS. Cross talk can be suppressed.

  The Min1 optical switch 10 shown in FIG. 1 is configured to be capable of independently controlling each multiplexed wavelength signal by providing the wavelength dispersion element 104. When the optical signal is not wavelength-multiplexed or when it is not necessary to control each wavelength signal independently, the wavelength dispersive element 104 is unnecessary. In this case, the signal light emitted from the input port 101-m enters one of the output ports 102-m-1 to 102-m-N.

  Further, in the Min 1 optical switch 10 shown in FIG. 1, WSS # 1 to WSS # M share the spatial light modulator 106, the lens 103, the wavelength dispersive element 104, and the lens 105, but only some of them It may be shared. In this case, the Min 1 optical switch 10 may include a plurality of portions among the spatial light modulator 106, the lens 103, the wavelength dispersive element 104, and the lens 105.

  Further, in the Min1 optical switch 10 shown in FIG. 1, one WSS includes one input port, but a plurality of input ports may be provided. However, in one WSS, only one signal light of the same wavelength can be independently controlled. The configuration of such a Min 1 optical switch is shown in FIG.

  FIG. 2 is a schematic view of the configuration of the Min 1 optical switch 10a. In the figure, the same parts as those of the Min 1 optical switch 10 shown in FIG. The Min 1 optical switch 10a shown in this figure is different from the Min 1 optical switch 10 shown in FIG. 1 in that each WSS #m (m is an integer of 1 or more and M or less) is replaced with P input ports 101-m. It is a point provided with (P is an integer greater than or equal to 2) input ports 101-m-1 to 101-m-P.

  This figure also shows the behavior when the input port 101-m-1 of each WSS #m emits signal light in the Min 1 optical switch 10 a. FIG. 3 shows the behavior when the input port 101-m -P of each WSS #m emits signal light in the Min 1 optical switch 10 a shown in FIG. 2. Although the angle at which the signal light is incident on the spatial light modulation element 106 is different in FIGS. 2 and 3, the spatial light modulation element 106 can control the deflection angle, so that switching can be performed similarly.

  Further, in each of FIG. 2 and FIG. 3, all WSS # 1 to WSS # M are the same p-th (p = 1 in FIG. 2; p = P in FIG. 3) input port among P input ports. Although -1-p to 10 1 -M p is used, any one of the input ports 101-m-1 to 101-m -P can be selected at each WSS #m. It is self-evident.

  Further, since the wavelength is demultiplexed by the wavelength dispersion element 104, different input ports may be used for each wavelength in each WSS #m. Furthermore, although one signal that can be independently controlled is output from any input port for each WSS # m, input signal light having a plurality of identical wavelengths is emitted from a plurality of input ports of one WSS. It does not matter. In such a case, the plurality of signal lights enter the spatial light modulation element 106 at different angles, and their deflection angles are collectively controlled. This is because the spatial light modulation element 106 controls the deflection angle for each area. For example, in one area, even if the angle of incidence of light is different, a constant angle δθ with respect to those angles is Polarize. Signal lights emitted from a plurality of input ports of one WSS enter the same area of the spatial light modulator 106. Therefore, when signal light is emitted from a plurality of input ports of one WSS, the signal light to be controlled that can be deflected to any angle is only the signal light emitted from one input port (for example, reference 1) reference).

  (Reference 1) Keita Yamaguchi, Kenya Suzuki, Joji Yamaguchi, "Beam steering by computer generated hologram for optical switches," Proc. SPIE Vol. 9773, Optical Metro Networks and Short-Haul Systems VIII, 97730D (13 February 2016)

Second Embodiment
FIG. 4 is a schematic view of an optical system from the input / output port of the WSS to the above-mentioned focusing point in the second embodiment. In the Min1 optical switch 10 described in the first embodiment, a configuration for condensing signal light input / output to the input / output port in the same 1 × N WSS at different angles at the same point (focus point) is , And lenses and fibers. A WSS having an optical system configured as shown in FIG. 4 can be used as one WSS # m in the Min 1 optical switch 10, 10a.

  The light output from the optical fibers 201-1 to 201-K connected to the input / output port is input in parallel to different portions of the lens 202. Since the position of the lens 202 is converted into an angle, the light from each of the optical fibers 201-1 to 201 -K is condensed at the same point at an angle corresponding to the incident position to the lens 202. By setting the light collection point P to the light collection point Pm described in the first embodiment, signal lights input to and output from input / output ports in the same WSS are collected at different angles at the same point. It is possible.

  Also, the light is propagated to the same path as the light output from the optical fibers 201-1 to 201 -K due to the reversibility of the light, thereby inputting the light to each port of the optical fibers 201-1 to 201 -K can do. In this case, the input port of the Min 1 optical switch 10, 10a of the first embodiment is an output port, and the output port is an input port.

  When the optical system shown in the figure is used for WSS # m of the Min1 optical switch 10 shown in FIG. 1, K = N + 1, and it is used for WSS # m of the Min1 optical switch 10a shown in FIGS. In the case of K = N + P.

Third Embodiment
FIG. 5 is a schematic view of an optical system from an input / output port of the WSS to the above-mentioned focusing point in the third embodiment. In the Min1 optical switch 10 described in the first embodiment, a configuration for condensing signal light input / output to the input / output port in the same 1 × N WSS at different angles at the same point (focus point) is , SBT (see, for example, Non-Patent Document 1). A WSS having an optical system configured as shown in FIG. 5 can be used as one WSS # m in the Min 1 optical switch 10, 10a.

  The light input to the input / output port from the input / output waveguides 301-1 to 301 -K is input to different portions of the slab waveguide 302 at different angles, and is output to space via the arrayed waveguide 303. At this time, the waveguides forming the arrayed waveguide 303 have the same optical path length, and the signal light input to the slab waveguide 302 is output to space at an angle corresponding to the input angle. By setting the output point to this space as the condensing point Pm described in the first embodiment, the signal light input / output to the input / output port in the same WSS can be made at the same point (condensing point P) It is possible to collect light at different angles.

  Further, since one SBT is not shared by a plurality of WSSs, the crosstalk generated in the optical circuit does not become an inter-WSS crosstalk but an inter-WSS crosstalk.

  In addition, each port of the input and output waveguides 301-1 to 301 -K is made to propagate light by propagating the light in the same path as the light output from the input and output waveguides 301-1 to 301 -K due to the reversibility of light. Light can be input. In this case, the input port of the Min 1 optical switch 10, 10a of the first embodiment is an output port, and the output port is an input port.

  When the optical system shown in the figure is used for WSS # m of the Min1 optical switch 10 shown in FIG. 1, K = N + 1, and it is used for WSS # m of the Min1 optical switch 10a shown in FIGS. In the case of K = N + P.

Fourth Embodiment
The optical cross connect apparatus of this embodiment uses the optical switches of the first to third embodiments for the Min1 WSS that configures R & S (Route & Select) WXC (wavelength cross connect).

  FIG. 12 described above shows an N × M (N input M output) R & S WXC in which Nin1 WSS and Min1 WSS are opposed to each other. The Nin1 WSS shown in FIG. 12 implements N 1 × M WSSs (WSS # 1 to WSS # N), and the Min1 WSS implements M N × 1 WSSs (WSS # 1 to WSS # M). In the R & S WXC, an optical signal is output from an arbitrary output port after passing through the WSS twice. With regard to crosstalk in WSS in which signal light leaks to an unintended port when switching in each WSS, double filtering is performed by passing the WSS in two stages, and the influence is reduced. For example, if the crosstalk in the WSS of Nin1 WSS and Min1 WSS used is -25 dB, the effect on crosstalk will be -25 dB -25 dB = -50 dB at the output of WXC because filtering is performed in two stages .

  On the other hand, cross-WSS crosstalk occurs due to leakage of signal light to different WSSs included in Nin1 WSS and Min1 WSS. If cross talk between WSSs occurs in the final stage, filtering can not be performed thereafter, which directly degrades the characteristics of the signal light. When the crosstalk between WSS of Nin1 WSS and Min1 WSS is -25 dB, it affects the output signal light as it is, so the influence on crosstalk at the output of WXC is -25 dB.

  In order to suppress this, there is a method of using different WSS for all WSSs. By completely separating the optical systems of the WSSs, it is possible to eliminate cross-WSS crosstalk. However, in this case, if the number of input ports is Nin and the number of output ports is Nout, Nin + Nout WSSs are required, and the number of ports increases and the number and cost of required WSSs increase.

  Therefore, by using the optical switches of the first to third embodiments as the Nin1 WSS, it becomes possible to construct WXC at low cost while suppressing crosstalk. For example, the Min1 optical switches 10 and 10a used as the first stage Nin1 WSS have WSS # 1 to WSS # N which are N 1 × M WSSs, and Min1 light used as the second stage Min1 WSS The switches 10 and 10a have WSS # 1 to WSS # M, which are M N × 1 WSSs. The light coupled to the WSS # n (n is an integer of 1 or more and N or less) output port 102-nm (m is an integer of 1 or more and M or less) included in the first stage Nin1 WSS is Min1 of the second stage It is incident on the input port 101-m of the WSS. Note that three or more stages of the optical switches according to the first to third embodiments may be passed.

  By configuring the WXC with the Min1 optical switches of the first to third embodiments described above, the influence of crosstalk can be suppressed as compared to the case where the cross connect switch is configured with the conventional Nin1 WSS.

Fifth Embodiment
The optical cross connect apparatus of this embodiment integrates all the WSSs necessary for an R & S WXC with N inputs and M outputs.

  FIG. 6 is a block diagram of the optical cross connect device 50 of the present embodiment. The R & S WXC shown in FIG. 12 has a configuration in which an optical switch (Nin1 WSS) in which N 1-input M-output WSS are integrated and an optical switch (Min1 WSS) in which M N-input 1-output WSS are integrated However, in the optical cross connect device 50 shown in FIG. 6, all these WSSs are integrated into one device. The WSS # (1-1) to WSS # (1-N) of N 1-input M-output WSSs provided in the optical cross connect device 50, and WSS # (2-1) of M N-input 1-output WSSs -WSS # (2-M). An optical signal of a certain wavelength output by WSS # (1-n) (n is an integer of 1 or more and N or less) is output to any one of WSS # (2-1) to WSS # (2-M). WSS # (2-m) (m is an integer of 1 or more and M or less) enters an optical signal of a certain wavelength from any of WSS # (1-1) to WSS # (1-N), Output to

  FIG. 7 is a schematic view of the configuration of an optical system used in the optical cross connect device 50 shown in FIG. In the figure, the same parts as those of the Min 1 optical switch 10 according to the first embodiment shown in FIG. The optical cross connect device 50 shown in the figure has a configuration in which (M + N) sets of WSS # 1 to WSS # (M + N) are integrated. WSS # 1 to WSS # N in FIG. 7 correspond to the optical cross connect devices WSS # (1-1) to WSS # (1-N) shown in FIG. 6, and WSS # (1 + N) to WSS # (in FIG. 7). M + N) corresponds to the optical cross connect devices WSS # (2-1) to WSS # (2-M) shown in FIG. As shown in the figure, the WSS of 1 input M output and the WSS of N input 1 output are the same optical system, and can be integrated by the same optical system as in the first to third embodiments described above. is there.

  WSS # n (n is an integer of 1 or more and N or less) has input / output ports 501-n and input / output ports 502-n-1 to 502-n-M. The input / output port 501-n and the input / output port 502-n-1 to 502-n-M correspond to the input port 101 and the output port 102 in the first embodiment. WSS # (m + N) (m is an integer of 1 or more and M or less) includes input / output port 501- (m + N) and input / output port 502- (m + N) -1 to 502- (m + N) -N. The input / output port 501- (m + N) and the input / output ports 502- (m + N) -1 to 502- (m + N) -N are input ports 101 when light is propagated in the path reverse to the first embodiment, This corresponds to the output port 102.

  WSS # n (n is an integer of 1 or more and N or less) inputs an optical signal from the outside through an input / output port 501-n, and an optical signal of the same wavelength is input / output port 502-n-1 to 502- Output from any of n-M. The optical signal output from the input / output port 502-nm (m is an integer of 1 or more and M or less) is input to the input / output port 502- (m + N) -n of WSS # (m + N). The optical signals input from the input / output ports 502- (m + N) -1 to 502- (m + N) -N of WSS # (m + N) are multiplexed and output from the input / output port 501- (m + N).

  According to the embodiment described above, the optical signal processing device has a plurality of optical switch function units. The optical signal processing device is, for example, the Min1 optical switches 10 and 10a. Each optical switch function unit has at least one input port, at least one output port, a plurality of lenses (for example, lenses 103 and 105), and a spatial light modulator. The input port externally receives light whose route is to be changed, and emits the light into the optical switch function unit. The output port receives the light whose direction is changed in the optical switch function unit and outputs the light to the outside. The light emitted from the input port of the optical switch function unit and incident on the plurality of lenses and the light incident on the output port of the optical switch function unit intersect at one point (condensing point). The light emitted from the input port of the optical switch function unit is incident on the spatial light modulation element through the plurality of lenses. The spatial light modulator is capable of controlling the diffraction angle of the incident light, and is incident on the focusing point at an angle corresponding to the diffraction angle controlled by the spatial light modulator, thereby connecting the input port and the output port. Switch. The condensing points of each of the plurality of optical switch function units exist at different positions. Further, some or all of the spatial light modulation element and the plurality of lenses are shared by the plurality of optical switch function units.

  The optical switch function unit may further include a wavelength dispersive element that splits light so as to diffract light at different angles for each wavelength so that the position of incidence to the spatial light modulation element is different. At this time, the plurality of output ports included in the same optical switch function unit have different incident angles. The spatial light modulation element modulates and reflects the diffraction angle of each of the light components of the wavelength dispersive element split into different positions for each wavelength. In each of the optical switch function units, the light emitted from the input port and the split light reflected by the spatial light modulation element and incident on each of the plurality of output ports via the plurality of lenses are other It crosses at one condensing point different from the condensing point of the optical switch function part.

  The optical switch function unit may further include a condensing lens. The condensing lens is, for example, a lens 202. In each of the optical switch function units, the light emitted from the input port and the light reflected by the spatial light modulation element and incident on the output port through the plurality of lenses include the input port, the output port, and the plurality of lenses. Through the condenser lens, and intersect at one condensing point different from the condensing point of the other optical switch function part.

  In each of the optical switch function units, the light emitted from the input port to the plurality of lenses and the light incident on the output port through the plurality of lenses are other light switches through the same SBT circuit. It may be made to intersect at one condensing point different from the condensing point of the functional part. Alternatively, when the optical switch function unit has a plurality of input ports, any one of them may emit light, and each of the plurality of input ports may emit light of different wavelengths.

  Further, according to the embodiment described above, the optical cross connect device includes one or more of the optical signal processing devices described above. The optical path change target light input to the optical cross connect device passes through different optical switch functional units in the same optical signal processing device provided in the optical cross connect device, or the optical switch functional portions of the different optical signal processing devices. Pass through. Each of the optical signal processing devices provided in the optical cross connect device receives light from any input port and outputs the light from any output port.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope of the present invention.

  It can be used for space multiplexing optical communication.

10, 10a: Min 1 optical switch, 50: optical cross connect device, 101-1 to 101-M, 101-1 to 101-M-P: input port, 102-1 to 102-M, N: Output port 103: lens 104: wavelength dispersion element 105: lens 106: spatial light modulation element 201-1 to 201-K optical fiber 202: lens 301-1 to 303-K input and output Waveguide, 302 ... slab waveguide, 303 ... arrayed waveguide, 501-1-501-(M + N), 502-1-1-502-(M + N)-N ... input / output port

Claims (5)

Equipped with multiple optical switch functions,
The optical switch function unit
One or more input ports that input light from the outside,
One or more output ports that output light to the outside,
With multiple lenses,
A spatial light modulation element that modulates and reflects a diffraction angle of the light emitted from the input port and incident through the plurality of lenses;
In each of the optical switch function units, the light emitted from the input port and the light reflected by the spatial light modulation element and incident on the output port through the plurality of lenses are one collection. Intersection at the light spot,
The focusing point is different for each of the plurality of optical switch function units.
A part or all of the spatial light modulation element and the plurality of lenses are shared by the plurality of optical switch function units,
Optical signal processor. It further comprises a wavelength dispersive element that splits the light so as to diffract at different angles for each wavelength so that the incident position to the spatial light modulation element differs.
The plurality of output ports included in the same optical switch function unit have different incident angles, respectively
The spatial light modulation element modulates and reflects the diffraction angles of the light demultiplexed by the wavelength dispersive element to different positions for each wavelength,
In each of the optical switch function units, the light emitted from the input port and the spatial light modulation element reflected and split into the plurality of output ports via the plurality of lenses. Light intersects with one of the focusing points,
The optical signal processing device according to claim 1. The optical switch function unit further includes a condensing lens,
In each of the optical switch function units, the light emitted from the input port and the light reflected by the spatial light modulation element and incident on the output port through the plurality of lenses are the input port And intersect at one of the focusing points via a focusing lens between the output port and the plurality of lenses.
The optical signal processing device according to claim 1 or 2. In each of the optical switch function units, the light emitted from the input port to the plurality of lenses and the light incident on the output port through the plurality of lenses are the same Spatial Beam Transformer circuit. The optical signal processing device according to claim 1 or 2, which intersects at one of the light collection points. An optical cross connect device comprising one or more optical signal processing devices according to any one of claims 1 to 4,
The input light whose route is to be changed passes through the optical switch function units of different optical switch function units in the same optical signal processing apparatus or the different optical signal processing apparatuses.
Optical cross connect device.

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