CN218630272U - Folding type MXN port wavelength selection switch - Google Patents
Folding type MXN port wavelength selection switch Download PDFInfo
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- CN218630272U CN218630272U CN202223081987.3U CN202223081987U CN218630272U CN 218630272 U CN218630272 U CN 218630272U CN 202223081987 U CN202223081987 U CN 202223081987U CN 218630272 U CN218630272 U CN 218630272U
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Abstract
The utility model discloses a folded form MXN port wavelength selector switch relates to optical communication and optical signal processing field, through one-dimensional fiber array with input beam conversion in the optic fibre for the gaussian beam, the gaussian beam passes short-focus cylindrical mirror, first long-focus cylindrical mirror and reflector in proper order, the gaussian beam pass by the reflector covers the beam splitting is the same first light beam and the second light beam of polarization state behind the polarization beam splitting combination prism, and two bundles of light diffract and pass the second long-focus cylindrical mirror through first, second transmission type phase diffraction grating and obtain first, second long-focus light beam respectively, and liquid crystal figure loading control system makes the same polarization state of wavelength selector switch received light signal through the debugging to the light beam through wavelength loading phase gray scale to light wave field modulator according to first, second long-focus light beam, changes the angle of light beam after the reflection on the x 'z' plane for the holistic energy loss of MXN port wavelength selector switch reduces, reduces energy loss.
Description
Technical Field
The utility model relates to an optical communication and optical signal handle the field, especially relate to a folded form MXN port wavelength selection switch.
Background
With the rise of 5G/6G, VR/AR and Internet related industries, the traditional optical fiber communication network faces huge pressure from multiple aspects such as network throughput, energy consumption and operation and maintenance cost. In recent years, the construction of the next-generation low-energy-consumption and high-spectrum-efficiency intelligent all-optical communication network based on all-optical switching, multidimensional multiplexing, high-spectrum-utilization-rate super-channel transmission and switching technology and software dynamic adjustment of network resources gradually becomes an important consensus in the communication research and industry fields, is one of the most important research hotspots and development directions in the current optical communication technical field, has extremely important research values and wide international market demands, and is widely concerned by various research institutions and device and equipment suppliers in the international range. An intelligent all-Optical communication network based on Reconfigurable Optical Add/Drop Multiplexer (ROADM) and grid-free flexible spectrum technology has been largely adopted in Optical switching nodes due to its advantages of transparency to data rate, low power consumption, low cost, high network resource utilization rate, etc., and becomes the main development direction of Optical switching technology in current Optical networks. A core optical engine Wavelength Selective Switch (WSS) in the ROADM is the only all-optical signal processing and all-optical switching device having powerful signal processing functions at present, and has become an important basic device essential for fully-photochemical and intelligent transformation of a global optical network currently and in the future.
In the existing optical switching node, a large number of WSS (1 input port and N output ports) with 1 × N ports are combined to realize cross interconnection between M input ends and N output ends among multidimensional nodes. Therefore, the optical signals of the multidimensional node are directly exchanged by using the M multiplied by N ports WSS (M input ports and N output ports) with high port number, so that the construction, operation and maintenance costs of the optical switching node and the complexity of system composition can be greatly reduced, and the method has great significance for the construction of future optical switching nodes.
The wavelength selective switch with M × N ports generally has M optical signal input ports and N optical signal output ports, and can implement a function of outputting any one or a group of wavelength signals in a port optical signal of the M input ports from any one or more ports of the N output ports. In recent years, major research institutions at home and abroad including companies such as Finisar, luminum, huashi and the like have brought wavelength selection switches for building M × N ports by using liquid crystal spatial light modulators into main research and development plans, but no commercialized wavelength selection switches for M × N ports exist so far, and the technical scheme of the wavelength selection switches for M × N ports faces key technical problems such as insufficient port number, complex optical path structure, large insertion loss and the like caused by size limitation of liquid crystal chips and mutual independence of incident/emergent ports, and no satisfactory technical scheme and experimental result exist so far. The existing known M multiplied by N port WSS does not have the independent processing of the polarization state and the switching of the light beam between the input/output ports, and the polarization processing restricts the number of the output ports of the WSS, so that the energy loss of the whole system is increased, and the energy loss is caused.
Disclosure of Invention
The utility model aims at providing a folded form MXN port wavelength selection switch for the holistic energy loss of MXN port wavelength selection switch reduces.
In order to achieve the above object, the utility model provides a following scheme:
a folded mxn port wavelength selective switch, comprising:
the one-dimensional optical fiber array is provided with M input ports and N output ports, each input port and each output port form a one-dimensional array along the x-axis direction, the M input ports are arranged in the middle, and the N output ports are respectively positioned at two sides of the M input ports; the incident Gaussian beams emitted by the input ports and the emergent Gaussian beams entering the output ports are transmitted along the direction of the z axis;
the incident Gaussian beam passes through the short-focus cylindrical mirror along the z axis to form a short-focus Gaussian incident beam;
the generatrix of the first long-focus cylindrical mirror and the generatrix of the short-focus cylindrical mirror are both positioned on an xz plane, and the z axis respectively passes through the generatrix of the first long-focus cylindrical mirror and the generatrix of the short-focus cylindrical mirror; the short-focus Gaussian incident beam passes through the first long-focus cylindrical mirror to obtain a long-focus Gaussian incident beam;
the polarization beam splitting combined prism is arranged perpendicular to the yz plane;
the reflecting mirror is placed perpendicular to a yz plane, the middle line of the reflecting mirror is parallel to the x axis, and the reflecting mirror covers part of the polarization beam splitting combination prism; the long-focus Gaussian incident beam passes through the polarization beam splitting and combining prism which is not covered by the reflector to form a first beam and a second beam which have the same polarization state and are parallel to the z axis;
the first transmission type phase diffraction grating is arranged perpendicular to a yz plane, and the first light beam penetrates through the first transmission type phase diffraction grating to obtain a first diffracted light beam;
the second transmission type phase diffraction grating is arranged perpendicular to the yz plane, is parallel to the first transmission type phase diffraction grating and has a set distance with the first transmission type phase diffraction grating; the second light beam passes through the second transmission type phase diffraction grating to obtain a second diffracted light beam; the second diffracted beam is parallel to the first diffracted beam; the transmission light path of the first diffracted light beam is taken as a z 'axis, the x axis is parallel to the x' axis, and the y 'axis is vertical to an x' z 'plane, so that an x' y 'z' three-dimensional coordinate system is established;
the second tele cylindrical mirror is arranged perpendicular to a y 'z' plane, a middle straight line of the first diffracted light beam and the second diffracted light beam is perpendicular to a central axis of the second tele cylindrical mirror, the central axis of the second tele cylindrical mirror is perpendicular to the y 'z' plane, and the first diffracted light beam and the second diffracted light beam penetrate through the second tele cylindrical mirror; the first diffracted light beam and the second diffracted light beam are subjected to light beam collimation and dispersion compensation through the second tele-beam cylindrical mirror to obtain a first tele light beam and a second tele light beam;
the light wave light field modulator is arranged corresponding to the second long-focus cylindrical mirror and is provided with M first light beam deflection areas and N second light beam deflection areas, each first light beam deflection area corresponds to each input port one by one, and each first light beam deflection area is centered; each second light beam deflection area corresponds to each output port one by one, and each second light beam deflection area is positioned at two sides of each first light beam deflection area; the light wave light field modulator is used for reflecting the first long-focus light beam and the second long-focus light beam to obtain a first reflected light beam and a second reflected light beam, and converting the divergence states of the first reflected light beam and the second reflected light beam on the x axis into parallel transmission states;
the liquid crystal pattern loading control system is connected with the light wave light field modulator and is used for loading a phase gray scale map to the light wave light field modulator according to the wavelengths of the first long-focus light beam and the second long-focus light beam; the light wave light field modulator is also used for changing the angles of diffraction angles of the first reflected light beam and the second reflected light beam on an x 'z' plane according to the phase gray scale pattern.
Preferably, the polarization beam splitting and combining prism includes:
the reflecting mirror is placed in a manner of being attached to the polarization beam splitter prism, and the reflecting mirror covers part of the polarization beam splitter prism; the long-focus Gaussian incident beam passes through the polarization beam splitter prism which is not covered by the reflector and then is split into a first initial beam in an S polarization state and a second initial beam in a P polarization state;
the light path conversion mirror is arranged corresponding to the polarization beam splitting prism and is used for deflecting the light path transmission angle of the first initial light beam in the S polarization state to obtain the first light beam in the S polarization state;
and the half-wave plate is glued with the polarization beam splitting prism and is used for changing the P polarization state of the second initial light beam into the S polarization state to form the second light beam in the S polarization state.
Optionally, the light path conversion mirror is a reflecting mirror or a right-angle prism.
Preferably, N is an even number, where, along the x-axis direction, N/2 output ports are located above the M input ports, and N/2 output ports are located below the M input ports, where the input ports and the output ports are symmetrically distributed.
Optionally, the lightwave lightfield modulator is a liquid crystal spatial light modulator.
Optionally, the liquid crystal spatial light modulator comprises: 3 liquid crystal chips.
Preferably, the short-focus cylindrical mirror is a cylindrical mirror with a focal length within 50 mm.
Preferably, the first tele cylindrical mirror and the second tele cylindrical mirror are cylindrical mirrors with a focal length of 100mm to 200 mm.
Optionally, the one-dimensional fiber array is a one-dimensional single-mode fiber collimator array or a one-dimensional fiber array coupling microlens.
Optionally, the short-focus cylindrical mirror, the first long-focus cylindrical mirror and the second long-focus cylindrical mirror are transmission cylindrical mirrors or reflection cylindrical mirrors embedded with antireflection film lenses.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model provides a folded form MXN port wavelength selector switch converts input beam into the gauss light beam in with optic fibre through one-dimensional fiber array, the gauss light beam passes short burnt cylindrical mirror along the z axle and obtains short burnt gauss incident beam, short burnt gauss incident beam passes first long burnt cylindrical mirror along the z axle and obtains long burnt gauss incident beam, long burnt gauss incident beam pass by the reflector cover the beam splitting is the same first light beam and the second light beam of polarization state behind the polarization beam splitting combination prism; the first light beam diffracts to the first transmission type phase diffraction grating along the z axis to obtain a first diffracted light beam, the second light beam diffracts to the second transmission type phase diffraction grating along the z axis to obtain a second diffracted light beam, and the first diffracted light beam and the second diffracted light beam are parallel; the first diffracted light beam and the second diffracted light beam pass through the second tele cylindrical mirror, and the first diffracted light beam and the second diffracted light beam realize light beam collimation and dispersion compensation through the second tele cylindrical mirror to obtain a first tele light beam and a second tele light beam which are transmitted to the light wave light field modulator; the liquid crystal pattern loading control system is connected with the light wave light field modulator, the liquid crystal pattern loading control system loads a phase gray graph according to the wavelengths of the first long-focus light beam and the second long-focus light beam, the light wave light field modulator reflects the first long-focus light beam and the second long-focus light beam to obtain a first reflected light beam and a second reflected light beam, the angles of the diffraction angles of the first reflected light beam and the second reflected light beam are changed, the slightly divergent state of the first reflected light beam and the slightly divergent state of the second reflected light beam on the x axis are converted into the parallel transmission state, and the energy loss of the whole MXN port wavelength selective switch is reduced and the energy loss is reduced through debugging the light beams for multiple times.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic perspective view of a folded mxn port wavelength selective switch of the present invention;
fig. 2 is a schematic diagram of optical axis transmission of light beams with different wavelengths of the folded mxn port wavelength selective switch of the present invention;
fig. 3 is a schematic diagram of the light spot size transmission of a single wavelength light beam of the folded mxn port wavelength selective switch of the present invention;
fig. 4 is a schematic diagram of the deflection angle of the optical axis when the liquid crystal spatial light modulator deflects the light beam for the first time and deflects the light beam for the second time on the xz plane of the folding mxn port wavelength selective switch of the present invention (for clarity of the light beam transmission path, the reflective liquid crystal spatial light modulator has been represented as a transmissive type, while ignoring the incident angle and the diffraction angle of the transmissive phase diffraction grating);
fig. 5 is a schematic diagram of the size change of the light beam when the liquid crystal spatial light modulator deflects the light beam for the first time and deflects the light beam for the second time on the xz plane of the folding mxn port wavelength selective switch of the present invention (for clearly showing the corresponding size change of the light beam, the reflective liquid crystal spatial light modulator has been shown as a transmissive type, while ignoring the incident angle and the diffraction angle of the transmissive phase diffraction grating);
fig. 6 is a schematic diagram of the deflection angle of the optical axis when the liquid crystal spatial light modulator deflects the light beam for the first time and deflects the light beam for the second time on the three-dimensional structure of the folding mxn port wavelength selective switch of the present invention.
Description of the symbols:
the device comprises a one-dimensional optical fiber array-1, a short-focus cylindrical lens-2, a first long-focus cylindrical lens-3, an optical path conversion lens-4, a reflective mirror-5, a polarization beam splitter prism-6, a half-wave plate-7, a first transmission type phase diffraction grating-8, a second transmission type phase diffraction grating-9, a second long-focus cylindrical lens-10, a light wave light field modulator-11 and a liquid crystal pattern loading control system-12.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a folded form MXN port wavelength selector switch, it is independent mutually with the switching of light beam between the processing of polarization state and input/output port, solved the restriction of polarization processing to WSS output port number in the MXN port WSS that has reported to thoroughly eliminated polarization conversion and handled the restriction effect that can hold optic fibre port quantity to wavelength selector switch, make the holistic energy loss of MXN port wavelength selector switch reduce, reduce energy loss.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the folding mxn port wavelength selective switch of the present invention includes: the device comprises a one-dimensional optical fiber array 1, a short-focus cylindrical mirror 2, a first long-focus cylindrical mirror 3, a reflective mirror 5, a polarization beam splitting combination prism, a first transmission type phase diffraction grating 8, a second transmission type phase diffraction grating 9, a second long-focus cylindrical mirror 10, a light wave field modulator 11 and a liquid crystal pattern loading control system 12.
Specifically, the one-dimensional optical fiber array 1 has M input ports and N output ports, each input port and each output port form a one-dimensional array along the x-axis direction, the M input ports are centered, and the N output ports are respectively located at two sides of the M input ports; and the incident Gaussian beams emitted by the input ports and the emergent Gaussian beams entering the output ports are transmitted along the z-axis direction.
The incident Gaussian beam passes through the short-focus cylindrical mirror 2 along the z-axis to form a short-focus Gaussian incident beam.
The generatrix of the first long-focus cylindrical mirror 3 and the generatrix of the short-focus cylindrical mirror 2 are both positioned on an xz plane, and the z axis respectively passes through the generatrix of the first long-focus cylindrical mirror 3 and the generatrix of the short-focus cylindrical mirror 2; the short-focus Gaussian incident beam passes through the first long-focus cylindrical mirror 3 to obtain a long-focus Gaussian incident beam. The short-focus cylindrical mirror 2 and the first long-focus cylindrical mirror 3 form an optical 4f system.
In this embodiment, the short-focus cylindrical mirror 2 is a cylindrical mirror with a focal length within 50 mm. The first tele cylindrical mirror 3 and the second tele cylindrical mirror 10 are cylindrical mirrors with a focal length of 100mm-200 mm. The focal lengths of the short-focus cylindrical mirror 2, the first long-focus cylindrical mirror 3 and the second long-focus cylindrical mirror 10 are defined according to actual needs.
The polarization beam splitting and combining prism is arranged perpendicular to the yz plane.
The reflecting mirror 5 is placed perpendicular to a yz plane, the middle line of the reflecting mirror 5 is parallel to the x axis, and covers part of the polarization beam splitting combination prism; and the long-focus Gaussian incident beams form a first beam and a second beam which have the same polarization state and are parallel to the z axis after passing through the polarization beam splitting and combining prism which is not covered by the reflective mirror 5.
Preferably, the mirror 5 covers half of the polarization beam splitting and combining prism.
The first transmission type phase diffraction grating 8 is arranged perpendicular to a yz plane, and the first light beam penetrates through the first transmission type phase diffraction grating 8 to obtain a first diffraction light beam.
The second transmissive phase diffraction grating 9 is disposed perpendicular to the yz plane, parallel to the first transmissive phase diffraction grating 8, and has a set distance from the first transmissive phase diffraction grating 8; the second light beam passes through the second transmission-type phase diffraction grating 9 to obtain a second diffracted light beam; the second diffracted beam is parallel to the first diffracted beam; and establishing an x 'y' z 'three-dimensional coordinate system by taking the transmission light path of the first diffracted light beam as a z' axis, wherein the x axis is parallel to the x 'axis, and the y' axis is vertical to an x 'z' plane.
The incidence angle and the diffraction angle of the first light beam and the second light beam are related to the number of lines on the corresponding transmission type phase diffraction grating. The optical path difference generated by the first light beam and the second light beam when the polarization beam splitting combination prism splits light can be compensated by adjusting the placing positions of the first transmission type phase diffraction grating 8 and the second transmission type phase diffraction grating 9.
The second tele cylindrical mirror 10 is disposed perpendicular to the y 'z' plane, a central axis of the second tele cylindrical mirror 10 is perpendicular to a middle straight line between the first diffracted beam and the second diffracted beam, the central axis of the second tele cylindrical mirror 10 is perpendicular to the y 'z' plane, and the first diffracted beam and the second diffracted beam pass through the second tele cylindrical mirror 10; and the first diffracted light beam and the second diffracted light beam are subjected to light beam collimation and dispersion compensation through the second tele-beam cylindrical mirror to obtain a first tele light beam and a second tele light beam.
The first diffracted beam and the second diffracted beam may all be incident on the second tele beam column 10.
The light wave light field modulator 11 is arranged corresponding to the second tele cylindrical mirror 10, and has M first light beam deflection regions and N second light beam deflection regions, each first light beam deflection region corresponds to each input port one by one, and each first light beam deflection region is centered; each second light beam deflection area corresponds to each output port one by one, and each second light beam deflection area is positioned at two sides of each first light beam deflection area; the light wave optical field modulator 11 is configured to reflect the first long focus light beam and the second long focus light beam to obtain a first reflected light beam and a second reflected light beam, and change an angle of diffraction angles of the first reflected light beam and the second reflected light beam, that is, an angle of diffraction angles on an x 'z' plane; while switching the slightly diverging state of the first reflected light beam and the second reflected light beam on the x-axis to a parallel transmission state.
The lightwave lightfield modulator 11 is placed perpendicular to the x 'z', y 'z' plane and parallel to the x 'y' plane.
The liquid crystal pattern loading control system 12 is connected to the light wave light field modulator 11, and is configured to load a phase grayscale map to the light wave light field modulator 11 according to the wavelengths of the first tele beam and the second tele beam; the lightwave light field modulator 11 is further configured to change angles of diffraction angles of the first reflected light beam and the second reflected light beam on an x 'z' plane according to the phase gray scale pattern.
The reflective mirror 5 is placed in close contact with the polarization beam splitter prism 6, and the reflective mirror 5 covers a part of the polarization beam splitter prism 6; the long-focus Gaussian incident beam passes through the polarization beam splitter prism 6 uncovered by the reflective mirror 5 and is split into a first initial beam in an S polarization state and a second initial beam in a P polarization state. And the side line of the reflective mirror 5 is coincided with the central line of the polarization beam splitter prism 6.
The light path conversion mirror 4 is arranged corresponding to the polarization beam splitter prism 6 and is used for deflecting the light path propagation angle of the first initial light beam in the S polarization state to obtain the first light beam in the S polarization state.
A half-wave plate 7 is glued to the polarizing beam splitting prism 6 for changing the P-polarization of the second initial beam into the S-polarization, forming a second beam of S-polarization.
When a light beam enters the wavelength selective switch, the wavelength selective switch will only act on optical signals of one polarization state, and half of the energy of the total optical signal carried by the other polarization state will be lost. The polarization state of the second initial light beam is changed through the polarization beam splitting and combining prism, so that the problem of energy loss is solved.
Optionally, the optical path conversion mirror 4 is a reflecting mirror or a right-angle prism.
According to actual needs, N is an even number, wherein, along the x-axis direction, N/2 output ports are positioned above M input ports, N/2 output ports are positioned below M input ports, and the input ports and the output ports are symmetrically distributed.
Optionally, the lightwave optical field modulator 11 is a liquid crystal spatial light modulator.
Optionally, the liquid crystal spatial light modulator comprises: 3 liquid crystal chips. Wherein, 1 liquid crystal chip corresponds to M input ports, and the other two chips respectively correspond to N/2 output ports; and continuously expanding the number of the liquid crystal chips according to the number of the required ports, wherein the surface of each liquid crystal chip is a two-dimensional pixel array.
When the number of the liquid crystal spatial light modulators is n, the number of the liquid crystal chips is n.
Optionally, the one-dimensional fiber array 1 is a one-dimensional single-mode fiber collimator array or a one-dimensional fiber array 1 coupled microlens. The one-dimensional single-mode fiber collimator array and the one-dimensional fiber array 1 coupling micro lens can achieve the same Gaussian beam output effect. The number of the ports of the one-dimensional single-mode optical fiber collimator array is the same as that of the one-dimensional single-mode optical fiber collimators.
Optionally, the short-focus cylindrical mirror 2, the first long-focus cylindrical mirror 3, and the second long-focus cylindrical mirror 10 are transmission cylindrical mirrors or reflection cylindrical mirrors embedded with antireflection film lenses.
The utility model discloses an embodiment of folded form MXN port wavelength selection switch, the step is as follows:
1) Light path setup (as shown in fig. 3):
a. the following are arranged along the transmission direction of the light beam in sequence: the device comprises a one-dimensional optical fiber array 1, a short-focus cylindrical mirror 2, a first long-focus cylindrical mirror 3, a reflective mirror 5, a polarization beam splitting combination prism, a first transmission type phase diffraction grating 8, a second transmission type phase diffraction grating 9, a second long-focus cylindrical mirror 10, a liquid crystal spatial light modulator and a liquid crystal pattern loading control system 12.
b. The one-dimensional optical fiber array 1 is provided with M input ports and N output ports, and each input port and each output port form a one-dimensional array along the x-axis direction; the M input ports are arranged in the middle, and the N output ports are respectively positioned at two sides of the M input ports; and the incident Gaussian beams emitted by the input ports and the emergent Gaussian beams entering the output ports are transmitted along the z-axis direction.
c. The generatrices of the short-focus cylindrical mirror 2 and the first long-focus cylindrical mirror 3 are both positioned on an xz plane, and the z axis respectively passes through the generatrices of the short-focus cylindrical mirror 2 and the first long-focus cylindrical mirror 3; the incident Gaussian beam passes through the short-focus cylindrical mirror 2 along the z axis to form a short-focus Gaussian incident beam; the short-focus Gaussian incident beam passes through the first long-focus cylindrical mirror 3 to obtain a long-focus Gaussian incident beam; the short-focus cylindrical mirror 2 and the first long-focus cylindrical mirror 3 form an optical 4f system.
d. The polarization beam splitting combination prism is arranged perpendicular to a yz plane and consists of a polarization beam splitting prism 6, an optical path conversion mirror 4 and a half-wave plate 7; the side line of the reflecting mirror 5, which is attached to the polarizing beam splitter prism 6 and is positioned at one side of the reflecting mirror 5, is flush with the center line of the polarizing beam splitter prism 6; the half-wave plate 7 is glued with the polarization beam splitter prism 6; and the long-focus Gaussian incident beams form a first beam and a second beam which have the same polarization state and are parallel to the z axis after passing through the polarization beam splitting and combining prism which is not covered by the reflector 5.
e. The first transmission-type phase diffraction grating 8 and the second transmission-type phase diffraction grating 9 are both arranged perpendicular to the yz plane, and a set distance is reserved between the second transmission-type phase diffraction grating 9 and the first transmission-type phase diffraction grating 8; the first light beam passes through the first transmission type phase diffraction grating 8 to obtain a first diffracted light beam; the second light beam passes through the second transmission-type phase diffraction grating 9 to obtain a second diffracted light beam; the second diffracted beam is parallel to the first diffracted beam.
f. The second tele cylindrical mirror 10 is disposed perpendicular to the y 'z' plane, a middle straight line of the first diffracted beam and the second diffracted beam is perpendicular to a central axis of the second tele cylindrical mirror, the central axis of the second tele cylindrical mirror 10 is perpendicular to the y 'z' plane, and the first diffracted beam and the second diffracted beam pass through the second tele cylindrical mirror 10; the first diffracted light beam is parallel to the second diffracted light beam, and the first tele light beam and the second tele light beam are obtained by carrying out light beam collimation and dispersion compensation on the first diffracted light beam and the second diffracted light beam through the second tele light beam cylindrical mirror.
g. The light wave light field modulator 11 is arranged corresponding to the second tele cylindrical mirror 10, and has M first light beam deflection regions and N second light beam deflection regions, wherein each first light beam deflection region corresponds to each input port one by one, and each first light beam deflection region is centered; each second light beam deflection area corresponds to each output port one by one, and each second light beam deflection area is positioned at two sides of each first light beam deflection area; the light wave optical field modulator 11 is configured to reflect the first long focus light beam and the second long focus light beam to obtain a first reflected light beam and a second reflected light beam.
h. As shown in fig. 5, the liquid crystal pattern loading control system 12 is connected to the light wave light field modulator 11, and is configured to load a phase gray pattern according to the wavelengths of the first tele light beam and the second tele light beam to control the light wave light field modulator 11, so as to form a phase holographic grating; the liquid crystal chips of the light wave light field modulator 11 are divided into M + N regions, the M regions correspond to the M input ports one by one, the M regions are first reflection regions and are marked as T 1 、T 2 ……T M (ii) a The M regions are located in the center of the lightwave lightfield modulator 11; n areas correspond to N output ports one by one, the N areas are second reflection areas and are marked as K 1 、K 2 ……K N (ii) a M and N are both natural numbers more than or equal to 2, and the input port and the output port are symmetrically distributed.
2) M independent incident beams with continuous wavelengths are respectively input into M input ports;
3) M input ports will output M Gauss light beams which are mutually independent and transmitted in parallel along the z axis, the optical axis of the M Gauss light beams passes through the bus of the short-focus cylindrical mirror 2 and the bus of the first long-focus cylindrical mirror 3, the M emergent light beams are expanded and collimated into parallel light beams along the y axis direction by adjusting the focal lengths of the short-focus cylindrical mirror 2 and the first long-focus cylindrical mirror 3, the size of the M light beams in the y axis direction is increased by the short-focus cylindrical mirror 2 and the first long-focus cylindrical mirror 3, and the size of the M light beams in the x axis direction is not affected.
4) The M long-focus Gaussian beams are divided into M first beams and M second beams after passing through a polarization beam splitting and combining prism, and the first beams and the second beams are in S polarization states and are transmitted in parallel to the z axis; the first light beam and the second light beam are separated in the y-axis direction and have a distance difference.
5) In the following embodiments, a single gaussian beam is used, and the first and second beams are incident on the first and second transmissive phase diffraction gratings 8 and 9, respectively; as shown in fig. 2, the first transmissive phase diffraction grating 8 disperses various different wavelengths of light included in the first light beam to obtain a first diffracted light beam, the second transmissive phase diffraction grating 9 disperses various different wavelengths of light included in the second light beam to obtain a second diffracted light beam, and the first diffracted light beam and the second diffracted light beam are transmitted to the second tele cylindrical lens 10.
6) The optical axis of the second tele cylindrical mirror 10 is located between the first light beam and the second light beam; the second tele cylindrical lens 10 respectively converts the first diffracted light beam and the second diffracted light beam into parallel light beams which are transmitted in parallel along the y 'z' plane optical axis, projects the light beams with single wavelength to the light wave light field modulator 11, deflects the whole of the light beams transmitted in parallel to the central line of the light wave light field modulator 11, and narrows the elliptical light beam with the y 'axis as the major axis in the light beam to an elliptical light beam with the x' axis as the major axis, namely focuses the elliptical light beam; the M light beams are respectively projected to M areas of the corresponding first reflection areas on the liquid crystal chip.
7) As shown in fig. 4, the light beams with different wavelengths in each light beam are transmitted in parallel to each other and projected to different pixel regions in the first reflection region corresponding to each light wave optical field modulator 11; by liquid crystal pattern loading controlThe system 12 loads the set phase holographic gratings on the pixel areas corresponding to different wavelengths in the M areas of the first light beam deflection area of the light wave optical field modulator 11, so that the light beam reflection light with different wavelengths generates a diffraction effect; as shown in FIG. 6, the angles of the reflected diffracted lights and the diffraction angles of the lights on the x ' z ' plane are changed by loading different phase diffraction gratings, the slightly divergent state of each light beam along the x ' axis is converted into the parallel transmission state, the spot size of the multi-wavelength light beam along the x ' axis direction is kept unchanged during the transmission process, and at the moment, the lightwave light field modulator 11 completes the first deflection on the first diffracted light beam and the second diffracted light beam, and the first deflection coordinate axis is defined as the x ' axis 1 ’，y 1 ’，z 1 ', thereby establishing a three-dimensional coordinate system; x is a radical of a fluorine atom 1 Axis parallel to x' axis, y 1 The axis being parallel to the y axis, z 1 The 'axis is parallel to the z' axis; namely, the lightwave optical field modulator 11 is used for light beams at x 1 ’z 1 ' on plane, y 1 ’z 1 ' completing the first deflection on the plane, obtaining a first deflected diffracted beam according to the first diffracted beam, and obtaining a second deflected diffracted beam according to the second diffracted beam; the first deflected and diffracted beams and the second deflected and diffracted beam are arranged at y 1 ’z 1 The deflection angle on the plane is theta, and the included angle between the first deflection diffraction beam and the second deflection diffraction beam is 2 theta; the lightwave optical field modulator 11 diffracts the first deflected diffracted light beam and the second deflected diffracted light beam in x 1 ’z 1 ' deflection is also accomplished in the plane at a deflection angle of alpha 1 。
8) Reflected by the light wave optical field modulator 11 and adjusts x 1 ’z 1 ' after the diffraction angle on the plane, the first deflected diffracted beam and the second deflected diffracted beam reach the second tele cylindrical mirror 10; the second tele cylindrical lens 10 converges the first deflected and diffracted light beam and the second deflected and diffracted light beam on an x 'z' plane and respectively projects the converged light beams to a first transmission type phase diffraction grating 8 and a second transmission type phase diffraction grating 9, and the multi-wavelength light beam in the first deflected and diffracted light beam is reversely dispersed through the second transmission type phase diffraction grating 9 to obtain a first reverse directionAnd the multi-wavelength light beam in the scattered light beam and the second deflected diffraction light beam is subjected to inverse scattering through the first transmission type phase diffraction grating 8 to obtain a second inverse scattered light beam.
9) The first inverse-scattered light beam and the second inverse-scattered light beam reversely pass through a polarization beam splitting combination prism after passing through a first transmission type phase diffraction grating 8 and a second transmission type phase diffraction grating 9 and reach a reflector 5, the reflector 5 reflects the first inverse-scattered light beam and the second inverse-scattered light beam and then forwards converts the first inverse-scattered light beam and the second inverse-scattered light beam into an S deflection state through the polarization beam splitting combination prism again to obtain a first inverse-scattered deflection light beam and a second inverse-scattered polarization light beam respectively, and the first inverse-scattered deflection light beam and the second inverse-scattered polarization light beam are transmitted in parallel; as shown in fig. 3, the spot sizes of the first and second inverse divergent light beams during transmission are kept unchanged in both the x-axis direction and the y-axis direction, and the first and second inverse divergent light beams are transmitted as parallel light.
10 The first and second inversely-dispersed polarized light beams are dispersed again through the second and first transmissive phase diffraction gratings 9 and 8, respectively, and are projected to the lightwave light field modulator 11 through the second tele cylindrical mirror 10 after being dispersed; parallel light beams with different wavelengths in the same light beam are projected to different pixel areas of the lightwave field modulator 11, light beams with the same wavelength in the first and second inversely scattered and deflected light beams are projected to the same pixel area of the lightwave field modulator 11, set phase holographic gratings are respectively loaded on pixel areas corresponding to different wavelengths in N areas of the first light beam deflection area of the lightwave field modulator 11 through the liquid crystal pattern loading control system 12, so that light beam reflected light with different wavelengths generates diffraction effect, angles of diffraction angles of the reflected diffracted light and light on an x 'z' plane are changed by loading different phase diffraction gratings, the parallel light state of each light beam along an x axis is converted into a slightly convergent state, namely the state is the same as the state when the light beam is originally incident to the lightwave field modulator 11 and is not reflected for the first time, at the moment, the lightwave field modulator 11 completes the second time of the first and second inversely scattered and deflected light beams, and defines that the second time of deflection is x coordinate axis 2 ’，y 2 ’，z 2 ', thereby establishing a three-dimensional coordinate system; x is the number of 2 Axis parallel to the x' axis, y 2 The axis is parallel to the y axis, z 2 The 'axis is parallel to the z' axis; at this time, the light wave optical field modulator 11 is used to modulate the light beam at x 2 ’z 2 ' on plane, y 2 ’z 2 Finishing second deflection on a plane, obtaining second deflected first diffracted light beams according to the first inverse divergent deflected light beams, and obtaining second deflected second diffracted light beams according to the second inverse divergent deflected light beams; the twice-deflected first diffracted light beam and the twice-deflected second diffracted light beam are arranged at y 2 ’z 2 The deflection angle on the plane is theta, and the included angle between the second-time deflected first diffracted beam and the second-time deflected second diffracted beam is 2 theta; the lightwave light field modulator 11 reflects the twice-deflected first diffracted light beam and the twice-deflected second diffracted light beam in the x direction 2 ’z 2 ' deflection is also accomplished in the plane at a deflection angle of alpha 1 (ii) a The second-time deflected first diffracted light beam and the second-time deflected second diffracted light beam reflected and adjusted by the light wave light field modulator 11 reach the y where the output port is located 2 ’z 2 'plane' and transmit it to the corresponding output port.
11 X) is reflected by the lightwave optical field modulator 11 and modulated 2 ’z 2 After the diffraction angle on the plane, the first diffracted light beam and the second diffracted light beam reach the second long-focus cylindrical lens 10 for focusing, respectively reach the first transmission-type phase diffraction grating 8 and the second transmission-type phase diffraction grating 9 for inverse dispersion, and then the two light beams reversely pass through the polarization combination prism, sequentially reversely pass through the first long-focus cylindrical lens 3 and the short-focus cylindrical lens 2, and then reach the output port of the one-dimensional optical fiber array 1. The MxN port wavelength selective switch enables the energy loss of the whole MxN port wavelength selective switch to be reduced and the energy loss to be reduced by converting incident light into optical signals in the same polarization state.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understand the device and the core idea of the present invention; meanwhile, for those skilled in the art, the idea of the present invention may be changed in the specific embodiments and the application range. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. A folded mxn port wavelength selective switch, comprising:
the one-dimensional optical fiber array is provided with M input ports and N output ports, each input port and each output port form a one-dimensional array along the x-axis direction, the M input ports are arranged in the middle, and the N output ports are respectively positioned on two sides of the M input ports; the incident Gaussian beams emitted by the input ports and the emergent Gaussian beams entering the output ports are transmitted along the z-axis direction;
the incident Gaussian beam passes through the short-focus cylindrical mirror along the z axis to form a short-focus Gaussian incident beam;
the generatrix of the first long-focus cylindrical mirror and the generatrix of the short-focus cylindrical mirror are both positioned on an xz plane, and the z axis respectively passes through the generatrix of the first long-focus cylindrical mirror and the generatrix of the short-focus cylindrical mirror; the short-focus Gaussian incident beam passes through the first long-focus cylindrical mirror to obtain a long-focus Gaussian incident beam;
the polarization beam splitting combined prism is arranged perpendicular to the yz plane;
the reflecting mirror is arranged perpendicular to a yz plane, the middle line of the reflecting mirror is parallel to the x axis, and the reflecting mirror covers part of the polarization beam splitting combination prism; the long-focus Gaussian incident beam passes through the polarization beam splitting and combining prism which is not covered by the reflector to form a first beam and a second beam which have the same polarization state and are parallel to the z axis;
the first transmission type phase diffraction grating is arranged perpendicular to a yz plane, and the first light beam penetrates through the first transmission type phase diffraction grating to obtain a first diffracted light beam;
the second transmission type phase diffraction grating is arranged perpendicular to the yz plane, is parallel to the first transmission type phase diffraction grating and has a set distance with the first transmission type phase diffraction grating; the second light beam passes through the second transmission type phase diffraction grating to obtain a second diffracted light beam; the second diffracted beam is parallel to the first diffracted beam; the transmission light path of the first diffracted light beam is taken as a z 'axis, the x axis is parallel to the x' axis, and the y 'axis is vertical to an x' z 'plane, so that an x' y 'z' three-dimensional coordinate system is established;
the second tele cylindrical mirror is arranged perpendicular to a y 'z' plane, a middle straight line of the first diffracted light beam and the second diffracted light beam is perpendicular to a central axis of the second tele cylindrical mirror, the central axis of the second tele cylindrical mirror is perpendicular to the y 'z' plane, and the first diffracted light beam and the second diffracted light beam penetrate through the second tele cylindrical mirror; the first diffracted light beam and the second diffracted light beam are subjected to light beam collimation and dispersion compensation through the second tele-beam cylindrical mirror to obtain a first tele light beam and a second tele light beam;
the light wave light field modulator is arranged corresponding to the second long-focus cylindrical mirror and is provided with M first light beam deflection areas and N second light beam deflection areas, each first light beam deflection area corresponds to each input port one by one, and each first light beam deflection area is centered; each second light beam deflection area corresponds to each output port one by one, and each second light beam deflection area is positioned at two sides of each first light beam deflection area; the light wave light field modulator is used for reflecting the first long-focus light beam and the second long-focus light beam to obtain a first reflected light beam and a second reflected light beam, and converting the divergence states of the first reflected light beam and the second reflected light beam on the x axis into parallel transmission states;
the liquid crystal pattern loading control system is connected with the light wave light field modulator and is used for loading a phase gray scale map to the light wave light field modulator according to the wavelengths of the first long-focus light beam and the second long-focus light beam; the light wave optical field modulator is also used for changing the angles of diffraction angles of the first reflected light beam and the second reflected light beam on an x 'z' plane according to the phase gray scale pattern.
2. The folded mxn port wavelength selective switch of claim 1, wherein the polarization beam splitting and combining prism comprises:
the reflecting mirror is placed in fit with the polarization beam splitter prism, and covers a part of the polarization beam splitter prism; the long-focus Gaussian incident beam passes through the polarization beam splitter prism which is not covered by the reflector and then is split into a first initial beam in an S polarization state and a second initial beam in a P polarization state;
the light path conversion mirror is arranged corresponding to the polarization beam splitting prism and is used for deflecting the light path transmission angle of the first initial light beam in the S polarization state to obtain the first light beam in the S polarization state;
and the half-wave plate is glued with the polarization beam splitting prism and is used for changing the P polarization state of the second initial light beam into the S polarization state to form the second light beam in the S polarization state.
3. The folding mxn port wavelength selective switch of claim 2, wherein the optical path conversion mirror is a mirror or a right-angle prism.
4. The folded mxn port wavelength selective switch of claim 1, wherein N is an even number, wherein N/2 output ports are located above M input ports and N/2 output ports are located below M input ports along the x-axis direction.
5. The folded mxn port wavelength selective switch of claim 1, wherein the lightwave optical field modulator is a liquid crystal spatial light modulator.
6. The folding mxn port wavelength selective switch of claim 5, wherein the liquid crystal spatial light modulator comprises: 3 liquid crystal chips.
7. The folding mxn port wavelength selective switch of claim 1, wherein the short-focus cylindrical mirror is a cylindrical mirror with a focal length within 50 mm.
8. The folded mxn port wavelength selective switch of claim 1, wherein the first and second tele cylindrical mirrors are cylindrical mirrors with a focal length of 100mm-200 mm.
9. The folded mxn port wavelength selective switch of claim 1, wherein the one-dimensional fiber array is a one-dimensional single-mode fiber collimator array or a one-dimensional fiber array coupling microlens.
10. The folded mxn port wavelength selective switch of claim 1, wherein the short-focus cylindrical mirror, the first long-focus cylindrical mirror, and the second long-focus cylindrical mirror are transmission cylindrical mirrors or reflection cylindrical mirrors embedded with antireflection film lenses.
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| CN202223081987.3U CN218630272U (en) | 2022-11-21 | 2022-11-21 | Folding type MXN port wavelength selection switch |
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| CN202223081987.3U CN218630272U (en) | 2022-11-21 | 2022-11-21 | Folding type MXN port wavelength selection switch |
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