CN114545559A - Multi-channel MEMS optical switch module - Google Patents
Multi-channel MEMS optical switch module Download PDFInfo
- Publication number
- CN114545559A CN114545559A CN202210020961.3A CN202210020961A CN114545559A CN 114545559 A CN114545559 A CN 114545559A CN 202210020961 A CN202210020961 A CN 202210020961A CN 114545559 A CN114545559 A CN 114545559A
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- Prior art keywords
- sliding
- block
- cavity
- shell
- sliding seat
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- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 239000013307 optical fiber Substances 0.000 claims abstract description 39
- 238000009434 installation Methods 0.000 claims description 22
- 230000005494 condensation Effects 0.000 claims 4
- 238000009833 condensation Methods 0.000 claims 4
- 230000005389 magnetism Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
- G02B6/3518—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror the reflective optical element being an intrinsic part of a MEMS device, i.e. fabricated together with the MEMS device
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
- G02B6/3584—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details constructional details of an associated actuator having a MEMS construction, i.e. constructed using semiconductor technology such as etching
Abstract
The invention relates to the technical field of optical communication, in particular to a multi-channel MEMS optical switch module; the utility model discloses a switch of optical fiber and a plurality of output optical fiber can be accomplished to the output current of electro-magnet, thereby the cost is lower, the utility model discloses a novel optical fiber, including a plurality of output optical fiber, input optical fiber and reflection unit, the reflection unit includes the sliding plate, the sliding seat, the permanent magnet, the electro-magnet, reset spring and speculum, adjust the output current of electro-magnet, change the magnetism of electro-magnet, the permanent magnet attracts mutually with the electro-magnet, make the sliding seat to the direction removal that is close to the electro-magnet, be provided with reset spring between the inner wall of cavity and the sliding seat, when the output current of electro-magnet is less, the sliding seat removes to the direction of keeping away from the electro-magnet, thereby according to the magnitude of the output current of electro-magnet, make the speculum on the sliding seat corresponding with the output interface of difference respectively, adopt above-mentioned structure only to need a speculum can accomplish the switching between an input optical fiber and a plurality of output optical fiber, the cost is lower.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a multi-channel MEMS optical switch module.
Background
The optical switch is an optical path switching device with one or more gating ports, and functions to switch optical signals and energy, thereby realizing the function of physical switching or logical addressing.
However, most of the existing multi-channel MEMS optical switches switch an input optical fiber and a plurality of output optical fibers through a plurality of mirrors, which is relatively high in cost.
Disclosure of Invention
The invention aims to provide a multi-channel MEMS optical switch module, which solves the problem that the cost is high because the input optical fiber and the output optical fibers are switched by a plurality of reflectors in the conventional multi-channel MEMS optical switch in the prior art.
In order to achieve the above object, the present invention provides a multi-channel MEMS optical switch module, which includes a housing, a plurality of output optical fibers, an input optical fiber, and a reflection unit, wherein one end of the housing is provided with a plurality of output interfaces, each output optical fiber corresponds to one output interface, an input interface is arranged on a sidewall of the housing, the input optical fiber corresponds to the input interface, a plurality of first condensing units are arranged inside the housing, each first condensing unit corresponds to one output interface, a second condensing unit is further arranged inside the housing, and the second condensing unit corresponds to the input interface;
the reflection unit is arranged in the shell and is positioned at one end of the shell far away from the output interface, the reflection unit comprises a sliding plate, a sliding seat, a permanent magnet, an electromagnet, a reset spring and a reflector, the sliding plate is positioned in the shell and is positioned at one end of the shell far away from the output interface, a cavity is arranged in the sliding plate, the electromagnet is arranged at one end of the cavity, a sliding groove is formed in one side of the sliding plate close to the output interface, the sliding seat is in sliding connection with the sliding groove, the permanent magnet is arranged at one end of the sliding seat in the cavity, the reflector is arranged at one end of the sliding seat far away from the cavity, the reset spring is also arranged in the cavity and is positioned at one end of the cavity far away from the electromagnet, one end of the reset spring is detachably connected with the inner wall of the cavity, and the other end of the reset spring is detachably connected with the sliding seat.
When the multi-channel MEMS optical switch module is used for testing different output optical fibers, the magnetism of the electromagnet is changed by adjusting the output current of the electromagnet, the sliding seat moves towards the direction close to the electromagnet due to the attraction of the permanent magnet and the electromagnet, and the reset spring is arranged between the inner wall of the cavity and the sliding seat.
The plurality of first condensing units comprise first supports and first condensing lenses, the first supports are detachably connected with the inner wall of the shell, the first condensing lenses are arranged at the centers of the first supports, and the centers of the first condensing lenses correspond to the output interfaces respectively.
The first support is arranged at each output interface, the first collecting lens is arranged on the first support, and the scattering of light at the exit of the output optical fiber is reduced through the first collecting lens.
The second light-condensing unit comprises a second support and a second light-condensing lens, the second support is detachably connected with the inner side wall of the shell, the second light-condensing lens is arranged at the center of the second support, and the center of the second light-condensing lens corresponds to the input interface.
And arranging the second bracket at the input interface, arranging the second condenser on the second bracket, and reducing the scattering of the light at the input optical fiber incident port through the second condenser.
The sliding seat comprises a sliding block, an installation block and a supporting body, the sliding block is connected with the sliding groove in a sliding mode, one end of the sliding block is provided with the installation block, the other end of the sliding block is provided with the supporting body, the installation block is located in the cavity, one side of the installation block is provided with the permanent magnet, the other side of the installation block is connected with the reset spring in a detaching mode, and the reflecting mirror is arranged on the supporting body.
The sliding seat by the sliding block the installation piece with the supporter constitutes, the sliding block with slide on the sliding tray, the installation piece is used for the installation the permanent magnet with connect reset spring, the supporter is used for the installation the speculum.
The supporting body is arranged in an isosceles right triangle structure, the second condenser lens corresponds to the inclined plane of the supporting body, and the reflecting mirror is arranged on the inclined plane of the supporting body.
The supporter is isosceles right triangle structure setting, the speculum is installed on the inclined plane of supporter, make the speculum can be better with the light reflection of second condensing lens output is in corresponding on the first condensing lens.
The reset spring comprises a spring body, a first connecting block and a second connecting block, the first connecting block is arranged at one end of the spring body, the second connecting block is arranged at the other end of the spring body, the first connecting block is connected with the inner wall of the cavity in a detachable mode, and the second connecting block is connected with the mounting block in a detachable mode.
The two ends of the spring body are respectively provided with the first connecting block and the second connecting block, the first connecting block is fixed on the inner wall of the cavity through screws, and the second connecting block is fixed on the mounting block through screws, so that the reset spring is mounted.
The invention relates to a multi-channel MEMS optical switch module, which comprises a shell, a plurality of output optical fibers, input optical fibers and a reflection unit, wherein the reflection unit comprises a sliding plate, a sliding seat, a permanent magnet, an electromagnet, a reset spring and a reflector, when the multi-channel MEMS optical switch module is used for testing different output optical fibers, the magnetism of the electromagnet is changed by adjusting the output current of the electromagnet, the sliding seat moves towards the direction close to the electromagnet due to the attraction between the permanent magnet and the electromagnet, the reset spring is arranged between the inner wall of a cavity and the sliding seat, when the output current of the electromagnet is small, the sliding seat moves towards the direction far away from the electromagnet, so that the reflector on the sliding seat corresponds to different output interfaces respectively according to the output current of the electromagnet, by adopting the structure, the switching between one input optical fiber and a plurality of output optical fibers can be completed by only one reflector, so that the cost is lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a cross-sectional view showing an internal structure of a multi-channel MEMS optical switch module provided by the present invention.
Fig. 2 is an enlarged view of a portion of the structure of fig. 1 a according to the present invention.
Fig. 3 is a schematic diagram of the internal structure of the multi-channel MEMS optical switch module provided by the present invention.
Fig. 4 is an enlarged view of a portion of the structure of fig. 3B according to the present invention.
Fig. 5 is an enlarged view of a portion of the structure of fig. 3C according to the present invention.
1-shell, 2-output optical fiber, 3-input optical fiber, 4-reflection unit, 5-output interface, 6-input interface, 7-first light gathering unit, 8-second light gathering unit, 9-sliding plate, 10-sliding seat, 11-permanent magnet, 12-electromagnet, 13-reset spring, 14-reflector, 15-cavity, 16-sliding groove, 17-first bracket, 18-first light gathering lens, 19-second bracket, 20-second light gathering lens, 21-sliding block, 22-mounting block, 23-support body, 24-spring body, 25-first connecting block, 26-second connecting block, 27-anti-interference unit, 28-fixing piece, 29-anti-interference tube, 30-fixing block, 31-supporting block, 32-fixing ring.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 5, the present invention provides a multi-channel MEMS optical switch module, which includes a housing 1, a plurality of output optical fibers 2, an input optical fiber 3, and a reflection unit 4, wherein one end of the housing 1 is provided with a plurality of output interfaces 5, each output optical fiber 2 corresponds to one output interface 5, a sidewall of the housing 1 is provided with an input interface 6, the input optical fiber 3 corresponds to the input interface 6, a plurality of first condensing units 7 are disposed inside the housing 1, each first condensing unit 7 corresponds to one output interface 5, a second condensing unit 8 is further disposed inside the housing 1, and the second condensing unit 8 corresponds to the input interface 6;
the reflection unit 4 is further arranged inside the housing 1, the reflection unit 4 is located at one end of the housing 1 far away from the output interface 5, the reflection unit 4 includes a sliding plate 9, a sliding seat 10, a permanent magnet 11, an electromagnet 12, a return spring 13 and a mirror 14, the sliding plate 9 is located inside the housing 1 and is located at one end of the housing 1 far away from the output interface 5, a cavity 15 is arranged inside the sliding plate 9, the electromagnet 12 is arranged at one end of the cavity 15, a sliding groove 16 is arranged at one side of the sliding plate 9 close to the output interface 5, the sliding seat 10 is slidably connected with the sliding groove 16, the permanent magnet 11 is arranged at one end of the sliding seat 10 inside the cavity 15, and the mirror 14 is arranged at one end of the sliding seat 10 far away from the cavity 15, the inside of cavity 15 still is provided with reset spring 13, reset spring 13 is located cavity 15 is kept away from the one end of electro-magnet 12, reset spring 13 one end with the inner wall of cavity 15 is dismantled and is connected, reset spring 13 the other end with sliding seat 10 is dismantled and is connected.
In this embodiment, when the multi-channel MEMS optical switch module is used to test different output optical fibers 2, the output current of the electromagnet 12 is adjusted to change the magnetism of the electromagnet 12, the permanent magnet 11 and the electromagnet 12 attract each other, so that the sliding seat 10 moves toward the electromagnet 12, and the return spring 13 is disposed between the inner wall of the cavity 15 and the sliding seat 10, so that when the output current of the electromagnet 12 is small, the sliding seat 10 moves away from the electromagnet 12, so that the mirrors 14 on the sliding seat 10 correspond to different output interfaces 5, respectively, according to the magnitude of the output current of the electromagnet 12, and with the above structure, only one mirror 14 is needed to switch between one input optical fiber 3 and a plurality of output optical fibers 2, the cost is lower.
Further, the plurality of first light gathering units 7 each include a first bracket 17 and a first light gathering lens 18, the plurality of first brackets 17 are detachably connected to the inner wall of the housing 1, the first light gathering lens 18 is disposed at the center of each first bracket 17, and the center of each first light gathering lens 18 corresponds to one output interface 5.
In the present embodiment, the first holder 17 is provided at each of the output interfaces 5, the first collecting mirror 18 is provided on the first holder 17, and the scattering of light at the exit of the output optical fiber 2 is reduced by the first collecting mirror 18.
Further, the second condenser unit 8 includes a second bracket 19 and a second condenser 20, the second bracket 19 is detachably connected to the inner side wall of the housing 1, the second condenser 20 is disposed at the center of the second bracket 19, and the center of the second condenser 20 corresponds to the input interface 6.
In the present embodiment, the second holder 19 is provided at the input interface 6, the second condenser 20 is provided on the second holder 19, and the scattering of light at the entrance of the input optical fiber 3 is reduced by the second condenser 20.
Further, the sliding seat 10 includes a sliding block 21, an installation block 22 and a supporting body 23, the sliding block 21 is slidably connected to the sliding groove 16, one end of the sliding block 21 is provided with the installation block 22, the other end of the sliding block 21 is provided with the supporting body 23, the installation block 22 is located inside the cavity 15, one side of the installation block 22 is provided with the permanent magnet 11, the other side of the installation block 22 is detachably connected to the return spring 13, and the supporting body 23 is provided with the reflector 14.
In the present embodiment, the slide base 10 is composed of the slide block 21, the mounting block 22, and the support 23, the slide block 21 slides on the slide groove 16, the mounting block 22 is used for mounting the permanent magnet 11 and connecting the return spring 13, and the support 23 is used for mounting the mirror 14.
Further, the supporting body 23 is arranged in an isosceles right triangle structure, the second condenser 20 corresponds to an inclined plane of the supporting body 23, and the reflecting mirror 14 is arranged on the inclined plane of the supporting body 23.
In this embodiment, the supporting body 23 is disposed in an isosceles right triangle structure, and the reflecting mirror 14 is installed on an inclined surface of the supporting body 23, so that the reflecting mirror 14 can better reflect the light output from the second collecting mirror 20 on the corresponding first collecting mirror 18.
Further, reset spring 13 includes spring body 24, first connecting block 25 and second connecting block 26, the one end of spring body 24 is provided with first connecting block 25, the other end of spring body 24 is provided with second connecting block 26, first connecting block 25 with the inner wall of cavity 15 is dismantled and is connected, second connecting block 26 with installation piece 22 is dismantled and is connected.
In this embodiment, the first connection block 25 and the second connection block 26 are respectively provided at both ends of the spring body 24, the first connection block 25 is fixed to the inner wall of the cavity 15 by a screw, and the second connection block 26 is fixed to the mounting block 22 by a screw, thereby completing the mounting of the return spring 13.
Further, a plurality of interference preventing units 27 are further disposed inside the housing 1, and each output interface 5 corresponds to one interference preventing unit 27.
In the present embodiment, the interference prevention unit 27 is provided at one end of each of the output interfaces 5 close to the reflection unit 4, so as to reduce interference when switching optical fibers.
Further, each of the interference preventing units 27 includes two fixing members 28 and an interference preventing pipe 29, the fixing members 28 are respectively sleeved at both ends of the interference preventing pipe 29, and each of the fixing members 28 is detachably connected to the inner bottom wall of the housing 1.
In the present embodiment, the fixing members 28 are fitted to both ends of the interference preventing pipe 29, and the fixing members 28 are fixed to the inner bottom wall of the housing 1 by screws, thereby completing the installation of the interference preventing unit 27.
Further, each fixing member 28 includes a fixing block 30, a supporting block 31 and a fixing ring 32, one end of the supporting block 31 is fixedly connected to the fixing block 30, the other end of the supporting block 31 is fixedly connected to the fixing ring 32, the fixing block 30 is detachably connected to the inner bottom wall of the housing 1, and the fixing ring 32 is sleeved on the outer portion of the interference preventing pipe 29.
In this embodiment, after the fixing ring 32 is sleeved outside the interference preventing pipe 29, the fixing block 30 is installed at the inner bottom of the housing 1 by using screws, so as to complete the installation of the fixing member 28, and the fixing block 30 and the fixing ring 32 are both fixedly connected with the supporting block 31, so that the structure is made more firm by adopting an integral molding technology during manufacturing.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A multi-channel MEMS optical switch module is characterized in that,
the multichannel MEMS optical switch module comprises a shell, a plurality of output optical fibers, input optical fibers and a reflection unit, wherein one end of the shell is provided with a plurality of output interfaces, each output optical fiber corresponds to one output interface, the side wall of the shell is provided with the input interface, the input optical fibers correspond to the input interfaces, a plurality of first light condensation units are arranged inside the shell, each first light condensation unit corresponds to one output interface, a second light condensation unit is further arranged inside the shell, and the second light condensation unit corresponds to the input interfaces;
the reflection unit is arranged in the shell and is positioned at one end of the shell far away from the output interface, the reflection unit comprises a sliding plate, a sliding seat, a permanent magnet, an electromagnet, a reset spring and a reflector, the sliding plate is positioned in the shell and is positioned at one end of the shell far away from the output interface, a cavity is arranged in the sliding plate, the electromagnet is arranged at one end of the cavity, a sliding groove is formed in one side of the sliding plate close to the output interface, the sliding seat is in sliding connection with the sliding groove, the permanent magnet is arranged at one end of the sliding seat in the cavity, the reflector is arranged at one end of the sliding seat far away from the cavity, the reset spring is also arranged in the cavity and is positioned at one end of the cavity far away from the electromagnet, one end of the reset spring is detachably connected with the inner wall of the cavity, and the other end of the reset spring is detachably connected with the sliding seat.
2. The multi-channel MEMS optical switch module of claim 1,
the plurality of first condensing units comprise first supports and first condensing lenses, the first supports are detachably connected with the inner wall of the shell, the first condensing lenses are arranged at the centers of the first supports, and the centers of the first condensing lenses correspond to the output interfaces respectively.
3. The multi-channel MEMS optical switch module of claim 1,
the second light-gathering unit comprises a second support and a second light-gathering mirror, the second support is detachably connected with the inner side wall of the shell, the second light-gathering mirror is arranged at the center of the second support, and the center of the second light-gathering mirror corresponds to the input interface.
4. The multi-channel MEMS optical switch module of claim 1,
the sliding seat comprises a sliding block, an installation block and a supporting body, the sliding block is connected with the sliding groove in a sliding mode, one end of the sliding block is provided with the installation block, the other end of the sliding block is provided with the supporting body, the installation block is located in the cavity, one side of the installation block is provided with the permanent magnet, the other side of the installation block is connected with the reset spring in a detaching mode, and the reflecting mirror is arranged on the supporting body.
5. The multi-channel MEMS optical switch module of claim 4,
the supporting body is in an isosceles right triangle structure, the second condenser lens corresponds to the inclined plane of the supporting body, and the reflecting mirror is arranged on the inclined plane of the supporting body.
6. The multi-channel MEMS optical switch module of claim 5,
the reset spring comprises a spring body, a first connecting block and a second connecting block, wherein the first connecting block is arranged at one end of the spring body, the second connecting block is arranged at the other end of the spring body, the first connecting block is detachably connected with the inner wall of the cavity, and the second connecting block is detachably connected with the mounting block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210020961.3A CN114545559A (en) | 2022-01-10 | 2022-01-10 | Multi-channel MEMS optical switch module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210020961.3A CN114545559A (en) | 2022-01-10 | 2022-01-10 | Multi-channel MEMS optical switch module |
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| Publication Number | Publication Date |
|---|---|
| CN114545559A true CN114545559A (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210020961.3A Pending CN114545559A (en) | 2022-01-10 | 2022-01-10 | Multi-channel MEMS optical switch module |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2002021195A2 (en) * | 2000-09-07 | 2002-03-14 | Terra-Op Ltd. | Method and system for ultra-fast switching of optical signals |
| US20020064337A1 (en) * | 2000-11-29 | 2002-05-30 | Behrang Behin | MEMS mirrors with precision clamping mechanism |
| CN2575692Y (en) * | 2002-09-21 | 2003-09-24 | 深圳市贝光通科技有限公司 | Three-dimensional stereo-picture frisket |
| WO2004008221A1 (en) * | 2002-07-12 | 2004-01-22 | Omron Corporation | Optical switch |
| CN101609000A (en) * | 2009-07-22 | 2009-12-23 | 重庆工学院 | A kind of optical fiber evanescent wave biomembrane activity detection sensor |
| WO2011157065A1 (en) * | 2010-06-18 | 2011-12-22 | 上海丽恒光微电子科技有限公司 | Optical path switch and optical router |
| CN106342258B (en) * | 2008-09-02 | 2012-08-29 | 中国电子科技集团公司第二十七研究所 | A kind of laser optical path switching device shifter |
-
2022
- 2022-01-10 CN CN202210020961.3A patent/CN114545559A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002021195A2 (en) * | 2000-09-07 | 2002-03-14 | Terra-Op Ltd. | Method and system for ultra-fast switching of optical signals |
| US20020064337A1 (en) * | 2000-11-29 | 2002-05-30 | Behrang Behin | MEMS mirrors with precision clamping mechanism |
| WO2004008221A1 (en) * | 2002-07-12 | 2004-01-22 | Omron Corporation | Optical switch |
| CN2575692Y (en) * | 2002-09-21 | 2003-09-24 | 深圳市贝光通科技有限公司 | Three-dimensional stereo-picture frisket |
| CN106342258B (en) * | 2008-09-02 | 2012-08-29 | 中国电子科技集团公司第二十七研究所 | A kind of laser optical path switching device shifter |
| CN101609000A (en) * | 2009-07-22 | 2009-12-23 | 重庆工学院 | A kind of optical fiber evanescent wave biomembrane activity detection sensor |
| WO2011157065A1 (en) * | 2010-06-18 | 2011-12-22 | 上海丽恒光微电子科技有限公司 | Optical path switch and optical router |
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