CN107577010B - Dual-wavelength selective switch - Google Patents
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- CN107577010B CN107577010B CN201710947473.6A CN201710947473A CN107577010B CN 107577010 B CN107577010 B CN 107577010B CN 201710947473 A CN201710947473 A CN 201710947473A CN 107577010 B CN107577010 B CN 107577010B
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- 230000010287 polarization Effects 0.000 claims abstract description 61
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- 239000006185 dispersion Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000003491 array Methods 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QWVYNEUUYROOSZ-UHFFFAOYSA-N trioxido(oxo)vanadium;yttrium(3+) Chemical compound [Y+3].[O-][V]([O-])([O-])=O QWVYNEUUYROOSZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a dual-wavelength selective switch, which comprises a collimator array component, a polarization conversion component, a separation component, a beam expansion component, a dispersion component, a focusing component, a second compensation conversion component and a deflection engine, wherein the collimator array component outputs a first unit collimated light beam and a second unit collimated light beam; the polarization conversion assembly comprises a polarization beam splitting assembly and a first compensation conversion assembly, converts the collimated light beam of the first unit into two first polarized light beams, and converts the collimated light beam of the second unit into two second polarized light beams, wherein the first polarization state and the second polarization state are perpendicular to each other. The embodiment of the invention aims to realize at least two sets of independent wavelength selective switches on the basis of adding a small number of components, and the size of a wavelength selective switch device is not increased, so that the cost is greatly reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical communication, in particular to a wavelength selective switch.
Background
The wavelength selective switch is the core of a Reconfigurable Optical Add-drop multiplexer (ROADM), and the introduction of an all-Optical ROADM node can provide Optical domain scheduling capability in units of wavelength. The ports of the wavelength selective switch are independent of wavelength, and links on the network side and the client side can be used, so that wavelength switching with unlimited directions is provided.
The wavelength selective switch that can be realized by the prior art includes at least one input port and N output ports, or includes N input ports and at least one output port (N is a natural number greater than or equal to 1), and can switch the optical beams of a plurality of input ports to the output port. In view of the high cost of the existing wavelength selection switch module, two sets of wavelength selection switches which can be used independently are usually manufactured in one module, which are called as dual-wavelength selection switches, and the dual-wavelength selection switches share most components, so that the cost is greatly reduced. The current dual-wavelength selective switch generally splits light in the wavelength direction, which results in the increase of the device size to a certain extent.
Disclosure of Invention
The invention provides a dual-wavelength selective switch, which aims to solve the problem that the cost and the space are increased due to the increase of the required number of wavelength selective switches in a ROADM optical node, realize the miniaturization of a wavelength selective switch device, improve the performance of the device and reduce the process difficulty.
The embodiment of the invention provides a dual-wavelength selective switch, which comprises a collimator array component, a polarization conversion component, a separation component, a beam expansion component, a dispersion component, a focusing component, a second compensation conversion component and a deflection engine, and is characterized in that:
the collimator array assembly outputs a first unit collimated light beam and a second unit collimated light beam;
the polarization conversion component comprises a polarization beam splitting component and a first compensation conversion component, converts the collimated light beam of the first unit into two first polarized light beams, and converts the collimated light beam of the second unit into two second polarized light beams, wherein the first polarization state and the second polarization state are perpendicular to each other;
the separating component separates the two first polarized beams from the two second polarized beams;
the beam expanding assembly expands the separated light beam;
the dispersion component disperses the light with each wavelength in the expanded light beam;
the focusing assembly comprises a deflection element and a focusing element, and focuses the dispersed light beams into a first unit focusing light beam and a second unit focusing light beam;
the second compensation conversion component converts the polarization state of the first unit focused light beam into the same polarization state as the second unit focused light beam;
the deflection engine comprises at least two deflection control areas, and the deflection control areas are used for deflecting the light beams incident to the deflection control areas respectively so as to select the output ports corresponding to the collimator array components.
In the dual-wavelength selective switch provided by the embodiment of the invention, the collimator array component outputs the first unit collimated light beam and the second unit collimated light beam, the polarization conversion component comprises the polarization splitting component and the first compensation conversion component, the first unit collimated light beam is converted into the two first polarized light beams, and the second unit collimated light beam is converted into the two second polarized light beams, so that the problem of cost and space increase caused by the increase of the number of required wavelength selective switches in a ROADM optical node is solved, the miniaturization of a wavelength selective switch device is realized, the device performance is improved, and the process difficulty is reduced.
Drawings
Fig. 1 is a schematic optical path diagram of a dual-wavelength selective switch in a wavelength dimension according to an embodiment of the present invention;
fig. 2 is a schematic optical path diagram of a dual-wavelength selective switch in a deflection dimension according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an input/output port of a collimator array assembly according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a polarization conversion module according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a second conversion compensation element according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an input/output port of another collimator array assembly according to a second embodiment of the present invention;
fig. 7 is a schematic optical path diagram of another dual-wavelength selective switch provided in the second embodiment of the present invention in the deflection dimension.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
An embodiment of the present invention provides a dual-wavelength selective switch, such as a schematic optical path structure of the dual-wavelength selective switch shown in fig. 1 and fig. 2, where fig. 1 is a schematic optical path diagram of the dual-wavelength selective switch in a wavelength dimension, and fig. 2 is a schematic optical path diagram of the dual-wavelength selective switch in a deflection dimension. The dual-wavelength selective switch comprises a collimator array component 11, a polarization conversion component 12, a separation component 13, a beam expansion component 14, a dispersion component 15, a focusing component 16, a second compensation conversion component 17 and a deflection engine 18, wherein:
a collimator array assembly 11 outputting a first unit collimated beam and a second unit collimated beam;
the polarization conversion component 12 comprises a polarization beam splitting component 121 and a first compensation conversion component 122, converts the first unit collimated light beam into two first polarization state light beams, and converts the second unit collimated light beam into two second polarization state light beams, wherein the first polarization state and the second polarization state are perpendicular to each other;
a separating assembly 13 for separating the two first polarized beams from the two second polarized beams;
a beam expanding assembly 14 for expanding the separated light beam;
a dispersion unit 15 for dispersing light of each wavelength in the expanded light beam;
a focusing assembly 16 including a deflecting element 161 and a focusing element 162, focusing the dispersed light beams into a first unit focused light beam and a second unit focused light beam;
a second compensation conversion component 17 for converting the polarization state of the first unit focused beam into the same polarization state as the second unit focused beam;
and the deflection engine 18 comprises at least two deflection control areas, and deflects the light beams incident to the deflection control areas respectively so as to select the corresponding output ports of the collimator array assembly.
In the first embodiment of the present invention, the collimator array component outputs the first unit collimated light beam and the second unit collimated light beam, which respectively correspond to the first unit wavelength selective switch and the second unit wavelength selective switch, converts the first unit collimated light beam into two first polarized light beams, and converts the second unit collimated light beam into two second polarized light beams, thereby solving the problem of cost and space increase caused by increasing the number of wavelength selective switches in the ROADM optical node, and realizing miniaturization of a wavelength selective switch device, improving device performance, and reducing process difficulty.
Further, fig. 3 is a schematic diagram of input and output ports of a collimator array assembly according to an embodiment of the present invention, as shown in fig. 3, the collimator array assembly 11 includes at least two collimator arrays FA1 and FA2, which are arranged in a column in a deflection dimension, where the collimator arrays FA1 and FA2 are collimator arrays including at least 1 input port and N output ports, respectively, and N is a natural number greater than or equal to 1.
The collimator arrays FA1 and FA2 are both composed of an optical fiber input and output array and a micro lens array, wherein the input signals of the optical fiber input ports are dense wavelength division multiplexing optical signals. The two collimator arrays are arranged in a column in a deflection dimension, wherein the deflection dimension refers to the dimension in which the optical signal is switched to a different collimator port. The collimator array FA1 outputs a first element of collimated light beam corresponding to a first element wavelength selective switch, and the collimator array FA2 outputs a second element of collimated light beam corresponding to a second element wavelength selective switch. The first unit wavelength selective switch and the second unit wavelength selective switch share other components except the collimator array assembly 11, and are manufactured and packaged in a module to form the dual-wavelength selective switch.
Further, fig. 4 is a schematic structural diagram of a polarization conversion assembly according to an embodiment of the present invention, and as shown in fig. 4, the polarization conversion assembly 12 includes a polarization splitting assembly 121 and a first compensation conversion assembly 122. The polarization splitting assembly 121 includes a first reflection prism 1211, a polarization splitting prism PBS 1212, and a second reflection prism 1213, and is attached to and arranged in a row in the deflection dimension. The first compensation conversion assembly 122 includes a compensation block 1221 and a half-wave plate 1222, and is disposed behind the first reflective prism. The wavelength dimension is a dimension in which light of each wavelength is dispersed when the expanded light beam passes through the dispersion member 15, and the wavelength dimension and the deflection dimension are perpendicular to each other.
In the polarization conversion module 12, the first unit collimated light beam is split into a first polarization state light beam and a second polarization state light beam in the deflection dimension by the PBS 1212, the second polarization state light beam is reflected by the first reflection prism 1211, and is converted into the first polarization state light beam by the first conversion compensation module 122, and thus, the first unit collimated light beam is converted into two first polarization state light beams which are separated in the deflection dimension and are parallel to each other by the polarization conversion module 12. The second unit collimated light beam passes through the polarization conversion assembly 12, and is converted into two light beams in a second polarization state which are separated in the deflection dimension and are parallel to each other, so far, the first unit collimated light beam and the second unit collimated light beam are overlapped in space, and the polarization directions of the first unit collimated light beam and the second unit collimated light beam are perpendicular to each other.
Through the arrangement of the polarization conversion assembly, the defect of device size increase caused by separation of two light beams with different polarization states in the wavelength dimension is avoided. And the half-wave plate is arranged to convert the two light beams with different polarization states into the two light beams with the same polarization state, so that the defect of high process difficulty caused by the fact that the half-wave plate is arranged at each input/output port of the collimator array assembly is overcome.
Further, the splitting component 13 is a birefringent crystal, preferably a pure yttrium vanadate crystal or wollaston prism, and separates the two first polarized beams and the two second polarized beams by a certain angle, and separates the first unit collimated beam and the second unit collimated beam of the dual-wavelength selective switch for processing on the deflection engine respectively.
Further, the beam expanding assembly 14 is a prism, a cylindrical mirror, a cylindrical lens or a cylindrical lens group.
Further, the dispersion element 15 is a prism, a transmissive grating, a reflective grating or a combination of a prism and a grating.
Further, the deflecting element 161, comprising at least one cylindrical lens, has a dioptric direction arranged in said deflecting dimension. Wherein the deflecting element 161 converges the two first polarized beams and the two second polarized beams in a deflecting dimension.
Further, the focusing element 162, including at least one cylindrical lens, has a dioptric direction set in the wavelength dimension. Wherein the focusing element 162 focuses the light beams of the respective wavelengths dispersed by the dispersion member 15 in the wavelength dimension.
Further, fig. 5 is a schematic structural diagram of a second compensation transformation assembly according to an embodiment of the present invention, and as shown in fig. 5, the second compensation transformation assembly 17 includes a half-wave plate 171 and a compensation block 172, which are arranged in a column in the deflection dimension. The half-wave plate 171 converts the first unit focused beam and the second unit focused beam with the polarization states perpendicular to each other into beams with the same polarization state, the compensation block 172 compensates for the optical path difference, so that the beams finally converged to the deflection engine 18 are converged in different deflection control regions with the same polarization state, and meanwhile, the second conversion compensation assembly 17 can be disposed at any position between the separation assembly 13 and the deflection engine 18.
Further, the deflection engine is a micro electro mechanical system MEMS, liquid crystal LC or liquid crystal on silicon LCOS phase space modulator.
Example two
As another implementation manner of the second embodiment, as shown in fig. 6, another dual-wavelength selective switch according to a second embodiment of the present invention is shown in a schematic diagram of an input/output port of another collimator array assembly. The collimator array assembly 11 includes at least a first unit port group M1 and a second unit port group M2, the first unit port group M1 and the second unit port group M2 are alternately arranged in a column in a deflection dimension, wherein the port groups include at least 1 input port, a collimator array of N output ports, and N is a natural number greater than or equal to 1.
Fig. 7 is an optical path in the deflection dimension of another dual-wavelength selective switch provided in the second embodiment, and as shown in fig. 7, the wavelength selective switch includes a collimator array component 11, a polarization conversion component 12, a beam expansion component 13, a dispersion component 14, a focusing component 15, and a deflection engine 16.
In the dual wavelength selective switch, the polarization splitting component 121 in the polarization conversion component 12 includes a first reflection prism 1211 and a PBS 1212. The focusing assembly 15 includes a deflecting element 151 and a focusing element 152. Two input and output port groups of the collimator array assembly 11 are arranged at a certain angle, so that a first unit light beam and a second unit light beam can be directly separated, the first unit light beam is converted into two first polarized light beams which are separated in a deflection dimension and are parallel to each other after passing through a polarization conversion assembly, and similarly, the second unit light beam is converted into two same first polarized light beams after passing through the polarization conversion assembly, so that the separation assembly and the second compensation conversion assembly are not required to be arranged.
In the second embodiment of the present invention, on the basis of the first embodiment, the two collimator arrays in the collimator array assembly are alternately arranged, and the two first polarized beams of the first unit beam and the two first polarized beams of the second unit beam are separated by a certain angle in the deflection dimension, so that the assemblies of the wavelength selective switch are further reduced, and the cost is saved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. The utility model provides a dual wavelength selector switch, includes collimator array subassembly, polarization conversion subassembly, separation subassembly, expands beam subassembly, dispersion subassembly, focus subassembly, second compensation conversion subassembly and deflection engine, its characterized in that:
the collimator array assembly outputs a first unit collimated light beam and a second unit collimated light beam;
the polarization conversion component comprises a polarization beam splitting component and a first compensation conversion component, converts the collimated light beam of the first unit into two first polarized light beams, and converts the collimated light beam of the second unit into two second polarized light beams, wherein the first polarization state and the second polarization state are perpendicular to each other;
the separating component separates the two first polarized beams from the two second polarized beams;
the beam expanding assembly expands the separated light beam;
the dispersion component disperses the light with each wavelength in the expanded light beam;
the focusing assembly comprises a deflection element and a focusing element, and focuses the dispersed light beams into a first unit focusing light beam and a second unit focusing light beam;
the second compensation conversion component converts the polarization state of the first unit focused light beam into the same polarization state as the second unit focused light beam;
the deflection engine comprises at least two deflection control areas, and the deflection control areas are used for deflecting light beams incident to the deflection control areas respectively so as to select output ports corresponding to the collimator array components;
the polarization beam splitting assembly comprises a first reflecting prism, a polarization beam splitting prism PBS and a second reflecting prism, and the first reflecting prism, the polarization beam splitting prism PBS and the second reflecting prism are arranged in a row in a fitting manner in a deflection dimension;
the first compensation conversion assembly comprises a compensation block and a half-wave plate and is arranged behind the first reflection prism;
the deflection element comprises at least one cylindrical lens, and the dioptric direction is arranged on the deflection dimension; the focusing element comprises at least one cylindrical lens, and the refraction direction is arranged on the wavelength dimension;
the deflection dimension is a dimension in which the first unit collimated light beam and the second unit collimated light beam are located, the wavelength dimension is a dimension in which light of each wavelength is dispersed when the expanded light beam passes through the dispersion assembly, and the deflection dimension is perpendicular to the wavelength dimension.
2. The dual wavelength selective switch of claim 1, wherein the collimator array assembly comprises at least two collimator arrays arranged in a column in a deflection dimension, wherein the collimator arrays comprise at least 1 input port, N output ports, N being a natural number greater than or equal to 1.
3. The dual wavelength selective switch of claim 1, wherein the collimator array assembly comprises at least a first unit port group and a second unit port group, the first unit port group and the second unit port group being alternately arranged in a column in a deflection dimension, wherein the port group comprises at least 1 input port, a collimator array of N output ports, N being a natural number greater than or equal to 1.
4. The wavelength selective switch of claim 1, wherein the splitting component is a birefringent crystal.
5. The wavelength selective switch of claim 1, wherein the beam expanding assembly is a prism, a cylindrical mirror, a cylindrical lens, or a cylindrical lens group.
6. The wavelength selective switch of claim 1, wherein the dispersive component is a prism, a transmissive grating, a reflective grating, or a combination of a prism and a grating.
7. The wavelength selective switch of claim 1, wherein the second transition compensation component comprises a half-wave plate and a compensation block arranged in a column in the deflection dimension.
8. The wavelength selective switch of claim 1, wherein the deflection engine is a micro-electromechanical system (MEMS), Liquid Crystal (LC) or Liquid Crystal On Silicon (LCOS) phase-space modulator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108897102B (en) * | 2018-08-12 | 2021-01-29 | 岳士军 | Dual-wavelength selective switch |
| CN109521528B (en) * | 2018-12-28 | 2020-05-12 | 武汉邮电科学研究院有限公司 | Device for realizing wavelength selective switch function |
| CN115694709A (en) * | 2021-07-23 | 2023-02-03 | 华为技术有限公司 | Optical switching device, method and related equipment |
| CN114167550A (en) * | 2021-12-10 | 2022-03-11 | 武汉邮电科学研究院有限公司 | One-input multi-output multi-core optical fiber optical switch and design method thereof |
| CN117031636B (en) * | 2023-10-08 | 2024-02-09 | 华中科技大学 | Wavelength selective switch with Tain structure and intelligent optical network device |
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