CN119179141B - Large-port-count matrix optical switch and optical communication equipment based on prism group - Google Patents
Large-port-count matrix optical switch and optical communication equipment based on prism group Download PDFInfo
- Publication number
- CN119179141B CN119179141B CN202411686383.2A CN202411686383A CN119179141B CN 119179141 B CN119179141 B CN 119179141B CN 202411686383 A CN202411686383 A CN 202411686383A CN 119179141 B CN119179141 B CN 119179141B
- Authority
- CN
- China
- Prior art keywords
- lcos chip
- prism group
- prism
- optical
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
- G02B6/3544—2D constellations, i.e. with switching elements and switched beams located in a plane
- G02B6/3546—NxM switch, i.e. a regular array of switches elements of matrix type constellation
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
-
- 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
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
-
- 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
- G02B6/34—Optical coupling means utilising prism or grating
-
- 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
- G02B6/3586—Control or adjustment details, e.g. calibrating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The application belongs to the field of optical fiber communication, and particularly discloses a large-port-number matrix optical switch based on a prism group and optical communication equipment. According to the application, the prism groups are respectively arranged in front of the first LCOS chip and the second LCOS chip, the prism groups in front of the first LCOS chip apply additional deflection to two mutually parallel polarized lights after polarization diversity of each port at the optical front end through refraction on the xz plane, so that the deflection angle requirement of the first LCOS chip is reduced, the prism groups in front of the second LCOS chip apply additional deflection to the linear polarized lights reflected by the concave mirror through refraction on the xz plane, so that the linear polarized lights are corrected to be parallel to each other, the additional deflection applied by the first LCOS chip is offset, the deflection angle requirement of the second LCOS chip is reduced, the diffraction efficiency is further increased, and the loss of a matrix switch is reduced. Alternatively, in the case where the diffraction deflection angle of the LCOS chip is fixed, such an optical design can realize a matrix switch with a larger number of ports.
Description
Technical Field
The application belongs to the field of optical fiber communication, and in particular relates to a large-port-number matrix optical switch based on a prism group and optical communication equipment.
Background
With the popularization and application of 5G communication and the development of mobile internet, network traffic is rapidly increasing, and the scale of the data center serving as one of internet infrastructures is larger and the service is heavier and heavier. Following the introduction of fiber interconnection technology in data centers, large-scale matrix optical switches (> 100 x 100 ports) are being introduced to improve access efficiency, which has wide application requirements in data centers and computing centers.
The technical scheme for realizing the large-scale matrix optical switch is quite various, and has three practical prospect, namely 1) DIRECTLIGHT technology, namely realizing optical path switching by driving optical fibers behind two micro lens arrays through piezoelectric materials, 2) 3D MEMS technology, namely realizing large-scale optical path switching through two MEMS micro lens arrays, and 3) Liquid Crystal On Silicon (LCOS) technology, namely realizing light beam deflection and optical path switching through two LCOS chips modulated in pure phases. The first scheme can realize a matrix switch with large port number, but has the advantages of complex driving and high driving voltage, the second scheme has the advantages of simple light path and small loss, but has high cost of MEMS chips and low yield, and the third scheme controls LCOS chips for beam deflection to be an all-solid-state element, and the whole matrix switch has no mechanical operation piece, so the method has the advantage of high reliability. Furthermore, LCOS chips are much lower cost and drive voltage and drive design simpler than the piezoelectric driver in the first solution and the MEMS chip in the second solution.
In an LCOS matrix optical switch, an LCOS chip deflects a light beam by diffraction effects, so as to realize optical path switching between ports. The method has the defects that the deflection angle of the LCOS chip to the light beam is slightly small (increasing the deflection angle can reduce diffraction efficiency, thereby increasing loss), and the port number of the matrix optical switch is restricted.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide a large-port-number matrix optical switch and optical communication equipment based on a prism group, and aims to solve the problem that the deflection angle of the existing LCOS chip to light beams is slightly smaller to restrict the port number of the matrix optical switch.
In order to achieve the above object, in a first aspect, the present application provides a large-port-number matrix optical switch based on a prism group, which includes an optical front end, a first prism group, a first LCOS chip, a concave mirror, a second prism group, a second LCOS chip and an optical rear end sequentially arranged along a planar W-shaped optical path;
The first LCOS chip and the second LCOS chip are both arranged on the focal plane of the concave reflector, and form a 2F optical system together;
the first prism group and the second prism group are consistent in structure, the first prism group applies additional deflection to two mutually parallel polarized lights after polarization diversity of each port at the optical front end through refraction on an xz plane, and the second prism group applies additional deflection to the linearly polarized lights after reflection by the concave reflector through refraction on the xz plane so as to enable the linearly polarized lights to be corrected to be mutually parallel;
On the premise that the driving voltage is not applied to the first LCOS chip and the second LCOS chip, two groups of parallel light beams generated by polarization diversity of each port at the optical front end are sequentially refracted through the first prism group, reflected by the first LCOS chip, reflected by the concave mirror and refracted by the second prism group, and then respectively incident on the central positions of the upper half area and the lower half area of the second LCOS chip.
Preferably, the distance between the first prism group and the first LCOS chip is in the range of [0,1mm ], and the distance between the second prism group and the second LCOS chip is in the range of [0,1mm ].
Preferably, in the large-port-number matrix optical switch, the following two conditions need to be satisfied simultaneously among the first prism group, the first LCOS chip and the concave mirror:
Wherein, Is an optical front end x the number of rows of directional ports,For the pixel area side length on the first LCOS chip assigned to a single port,For the length of the first LCOS chip,Is the focal length of the concave mirror,For the angle between the incident light and the normal of the incident surface of the first prism group,For the angle between the emergent light and the normal line of the emergent surface of the first prism group,Is the refractive index of the first prism group.
Preferably, the first prism group is formed by gluing two identical four prisms, and in a side view angle, the four prisms are right trapezoid, right-angle thick ends of the two four prisms are aligned, and the first prism group is roof-shaped.
Preferably, the first prism group is formed by two identical triangular prisms, and in side view, the triangular prisms are right-angled triangles, the thin ends of the two triangular prisms are aligned, and the first prism group is formed into a V shape.
Preferably, the thickness of the thinnest part of the prism group is not less than 0.3mm.
Preferably, the first prism group is rectangular in plan view, the length of the rectangle is at least 2mm larger than the length of the first LCOS chip, and the width of the rectangle is at least 2mm larger than the width of the first LCOS chip.
Preferably, the optical front end comprises a two-dimensional collimator array, a polarization splitting prism, a compensation block and a half-wave plate, wherein,
The two-dimensional collimator array comprises a plurality of ports, each port is used for converting a small-light-spot divergent beam at the output end of the optical fiber into a large-light-spot collimated beam, and the large-light-spot collimated beam enters the polarization beam splitting prism;
The polarization beam splitting prism is used for transmitting p waves and reflecting s waves so as to obtain two beams of linear polarized light which are parallel to each other and have orthogonal polarization states after an incident beam of random polarized light passes through polarization beam splitting, wherein one beam of light passes through the compensation block to compensate the optical path difference of the two beams of light, the polarization state of the light passes through the half wave plate to rotate by 90 degrees, and finally the two beams of light are parallel to each other and have the same polarization state, so that polarization diversity is realized.
Preferably, the corresponding block on the first LCOS chip generates x-direction maximum diffraction deflection angleMaximum diffraction deflection angle in y directionWherein, the method comprises the steps of, wherein,Is the focal length of the concave mirror,Representing the optical front end x the number of rows of directional ports,Indicating the number of columns of ports in the Y-direction of the optical front,For the pixel area side length on the first LCOS chip assigned to a single port,For the number of ports at the optical front-end,The pixel area size allocated to a single port on the first LCOS chip.
In order to achieve the above object, according to a second aspect of the present application, there is provided an optical communication device including the large-port-number matrix optical switch according to the first aspect and a circuit control board for providing phase adjustment signals to a first LCOS chip and a second LCOS chip in the large-port-number matrix optical switch.
In general, the above technical solutions conceived by the present application have the following beneficial effects compared with the prior art:
the application provides a large-port-number matrix optical switch and optical communication equipment based on a prism group, wherein the prism group is respectively arranged in front of a first LCOS chip and a second LCOS chip, the prism group in front of the first LCOS chip applies additional deflection to two mutually parallel polarized lights after polarization diversity of each port at the optical front end through refraction on an xz plane, so that the deflection angle requirement of the first LCOS chip is reduced, and the prism group in front of the second LCOS chip applies additional deflection to the linear polarized lights reflected by a concave reflector through refraction on the xz plane, so that the two polarized lights are corrected to be parallel to each other, the additional deflection applied by the first LCOS chip is offset, the deflection angle requirement of the second LCOS chip is reduced, the diffraction efficiency is further increased, and the loss of the matrix switch is reduced. Alternatively, in the case where the diffraction deflection angle of the LCOS chip is fixed, such an optical design can realize a matrix switch with a larger number of ports.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a large-port-number matrix optical switch based on a prism group according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an optical front end structure according to an embodiment of the present application.
Fig. 3 is a diagram of pixel partition and port correspondence on an LCOS chip according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a first prism set according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a second prism assembly according to an embodiment of the present application.
Fig. 6 is a schematic diagram illustrating beam deflection by the first prism set according to an embodiment of the present application.
Fig. 7 is an equivalent optical path diagram of a 2F optical system according to an embodiment of the present application, where (a) corresponds to a prism-free group, (b) corresponds to a first prism-structured group disposed in front of an LCOS chip, and (c) corresponds to a second prism-structured group disposed in front of the LCOS chip.
Fig. 8 is a comparison chart of light spot positions on a second LCOS chip according to an embodiment of the present application, (a) corresponds to a prism-free group, and (b) corresponds to a prism group disposed in front of the LCOS chip.
The same reference numbers are used throughout the drawings to reference like elements or structures, wherein:
1-optical front end, 2-first prism group, 3-first LCOS chip, 4-concave reflector, 5-second prism group, 6-second LCOS chip, 7-optics rear end, 11-two-dimensional collimator array, 12-polarization beam splitter prism, 13-compensation block, 14-half wave plate.
Detailed Description
For convenience of understanding, the following explains and describes english abbreviations and related technical terms related to the embodiments of the application.
Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
As shown in fig. 1, the application provides a large-port-number matrix optical switch based on a prism group, which comprises an optical front end 1, a first prism group 2, a first LCOS chip 3, a concave reflector 4, a second prism group 5, a second LCOS chip 6 and an optical rear end 7, wherein the optical front end 1, the first prism group 2, the first LCOS chip 3, the concave reflector 4, the second prism group 5, the second LCOS chip 6 and the optical rear end 7 are sequentially arranged along an optical path. The first LCOS chip 3 and the second LCOS chip 6 are arranged on the focal plane of the concave reflector 4 to form a 2F optical system and a W-type optical path.
The optical front end 1 and the optical rear end 7 have the same structure, each port of the optical front end converts a small light spot divergent beam of an input optical fiber into a large light spot collimated beam, two parallel linear polarized lights with the same polarization state are obtained after polarization diversity and are incident to the first prism group 2, and each port of the optical rear end synthesizes one beam of the two parallel linear polarized lights with the same polarization state output from the second LCOS chip 6 and is coupled to the output optical fiber.
The first prism group 2 and the second prism group 5 are identical in structure and each have a wedge angle in the x direction (in fig. 6) Thereby producing refraction in the xz plane. The first prism group 2 applies additional deflection to two mutually parallel polarized lights after polarization diversity of each port at the optical front end through refraction on an xz plane, so that the deflection angle requirement of the first LCOS chip 3 is reduced, and the second prism group 5 applies additional deflection to the linearly polarized lights reflected by the concave reflector through refraction on the xz plane, so that the linear polarized lights are corrected to be mutually parallel, the additional deflection applied by the first prism group is offset, and the deflection angle requirement of the second LCOS chip 6 is reduced.
The first LCOS chip 3 and the second LCOS chip 6 have identical structures and are respectively used for changing the diffraction deflection angle of the light beam through electric control after the driving voltage is applied, so that the light path switching between different ports is realized.
On the premise that the driving voltage is not applied to the first LCOS chip 3 and the second LCOS chip 6, two groups of parallel light beams generated by polarization diversity of each port are sequentially refracted by the first prism group, reflected by the first LCOS chip, reflected by the concave mirror and refracted by the second prism group, and then respectively incident on the central positions of the upper half area and the lower half area of the second LCOS chip.
Preferably, as shown in fig. 2, the optical front-end 1 comprises a two-dimensional collimator array 11, a polarization splitting prism 12, a compensation block 13 and a half-wave plate 14, wherein,
The two-dimensional collimator array 11 includes a plurality of) Each port is used for converting a small-light-spot divergent beam at the output end of the optical fiber into a large-light-spot collimated beam and entering the polarization beam splitter prism;
The polarization beam splitter prism 12 is used for transmitting p-waves and reflecting s-waves, so that after an incident beam of randomly polarized light passes through polarization beam splitting, two beams of linear polarized light which are parallel to each other and have orthogonal polarization states are obtained, wherein one beam of light passes through the compensation block 13 to compensate the optical path difference of the two beams of light, the polarization state of the two beams of light passes through the half wave plate 14 to rotate 90 degrees, and finally the two beams of light are parallel to each other and have the same polarization state, so that polarization diversity is realized.
Preferably, the polarization splitting prism 12 is a glued prism composed of a sheet of triangular prism and a sheet of rhombic prism, and a polarization splitting film is plated on the glued surface of both, and is capable of transmitting p-waves (polarized light whose light vector is parallel to the paper surface) and reflecting s-waves (polarized light whose light vector is perpendicular to the paper surface). Since the optical path in the rhombic prism is larger than that of the triangular prism, a compensation block 13 is added behind the rhombic prism to compensate the optical path difference of the two beams of light.
Thus, in the optical front end 1, a set of outputs from the two-dimensional collimator array 11Multiple) randomly polarized light beams, and obtaining two groups (each after polarization diversityAnd each) are parallel to each other and have the same polarization state.
The gaussian beam output from the two-dimensional collimator array 11 has a spot radius of99% Of the light energy is distributed in diameterWithin the range. The pixel area on the first LCOS chip 3 allocated to a single port is of sizeIn order to ensure the diffraction effect of the LCOS chip on Gaussian beams and avoid mutual interference between ports, the following needs to be satisfied:
。
Since the beam waist of the gaussian beam passing through the two-dimensional collimator array 11 is located on the first LCOS chip 3, the spot size at the output end face of the two-dimensional collimator array 11 will be larger than the beam waist size thereof, and the output spot size is set as The size of the pixel area allocated to a single port on the first LCOS chip 3 is limitedThere are:
。
the spot sizes on the first LCOS chip 3 and the second LCOS chip 6 are identical. As shown in fig. 3, the first LCOS chip 3 and the second LCOS chip 6 are each divided into upper and lower half areas, and each process a beam of polarized light split by polarization diversity. The two half areas on the first LCOS chip 3 correspond to two groups (each of which is output after polarization diversity by the optical front end 1 Several) linear polarized light, and two half areas on the second LCOS chip 6 correspond to two groups (each) of polarized light output by the optical back end 7 after polarization diversityAnd a) linearly polarized light. Since the two-dimensional collimator array 11 is commonMultiple ports, thus the two LCOS chips are of the same size。
The pure phase modulation LCOS chip is a pixelated element, and the refractive index of a liquid crystal layer in each pixel can be regulated and controlled through an electric control birefringence effect, so that the phase delay of a light beam reflected by each pixel is regulated and controlled. The LCOS chip can form a dynamic phase grating by regulating and controlling the phase of each pixel, control the (reflective) diffraction direction of the light beam, and can be dynamically regulated.
The LCOS chip consists of a plurality of blocks, and the pixel area of each block has the size ofOne port corresponding to the optical front end of the matrix switch is used for controlling the diffraction direction of one beam of polarized light split by polarization diversity and guiding the polarized light to a target output port. The LCOS chip is equivalent to a reflecting mirror on the premise of not applying driving voltage, and the diffraction deflection angle of the light beam is changed through electric control on the premise of applying driving voltage, so that the light path switching among different ports is realized.
The first prism group 2 is identical to the second prism group 5 in structure, and the first prism group 2 is described in the present application. The first prism group 2 is preferably designed in two configurations as shown in fig. 4 and 5.
As shown in fig. 4, the first prism group 2 is formed by gluing two identical four prisms, and in a side view, the four prisms are right trapezoid, right thick ends of the two four prisms are aligned, and the first prism group 2 is in a roof shape. Instead of this, a roof prism may be used.
As shown in fig. 5, the first prism group 2 is formed by two identical triangular prisms, and in a side view, the triangular prisms are right-angled triangles, and the thin ends of the two triangular prisms are aligned, so that the first prism group 2 is formed in a V shape.
The beam passes back and forth through the first prism set 2 to generate an additional deflection angle, and the deflection principle of the two structures in fig. 4 and 5 on the beam is the same, but the slope directions are opposite.
Next, the operation will be described by taking the structure shown in fig. 4 as an example. As shown in FIG. 6, the inclination angle of the inclined plane of the first prism group 2 is set asThe refractive index of the material is. The light beam vertically enters the surface of the first prism group and forms an included angle with the normal line of the inclined plane of the first prism groupThe included angle between the light beam and the inclined plane after being refracted by the inclined plane isThe following steps are:
。
The light beam passes through the inclined plane of the first prism group after being reflected by the first LCOS chip 3, and the included angle between the light beam and the normal line of the inclined plane is as follows From the geometric calculation it is possible to:
。
The light beam is refracted by the inclined plane again and then is emitted, and the included angle between the emitted light and the inclined plane is The following steps are:
。
The final included angle between the emergent light and the incident light is 。
The application changes the extra deflection angle introduced by the first prism group through the slope and the refractive index of the first prism group 2) The two groups of light beams generated by polarization diversity of the optical front end 1 are respectively incident to the upper half area and the lower half area of the second LCOS chip 6 under the action of the concave reflecting mirror 4.
Preferably, in the large-port-number matrix optical switch, the following two conditions need to be satisfied simultaneously among the first prism group, the first LCOS chip and the concave mirror:
Wherein, For the length of the first LCOS chip,Is the focal length of the concave mirror,For the angle between the incident light and the normal of the incident surface of the first prism group,For the angle between the emergent light and the normal line of the emergent surface of the first prism group,Is the refractive index of the first prism group.
As shown in fig. 6, the outgoing position of the light beam after passing back and forth through the first prism group 2 is laterally shifted, and the distance from the midpoint of the inclined plane of the first prism group 2 to the first LCOS chip 3 is set asThe lateral shift。
In order to minimize the lateral offset, the first prism group 2 should be as close to the first LCOS chip 3 as possible, and the distance between the first prism group and the first LCOS chip is preferably in the range of [0,1mm ], and the distance between the second prism group and the second LCOS chip is preferably in the range of [0,1mm ]. Thickness of the first prism group 2As small as possible, but the thickness of the prism assemblyToo small increases the difficulty of processing and is fragile, and the thickness of the thinnest part of the prism group is preferably not less than 0.3mm.
Preferably, the first prism group is rectangular in top view, and the length of the rectangle is larger than the length of the first LCOS chip) At least 2mm greater, the width of the rectangle is larger than the width of the first LCOS chip) At least 2mm larger.
The length and width conditions are preferable in the present application to ensure that the first prism group 2 and the second prism group 5 can cover the light beams entering the first LCOS chip 3 and the second LCOS chip 6.
When the prism group is not disposed in front of the LCOS chip, the equivalent optical path is shown in fig. 7 (a), in which the concave mirror 4 is equivalent to a lens, and the light beams from all the input ports are reflected by the first LCOS chip 3 and focused by the lens, and then all the light beams are incident on the center of the second LCOS chip 6, as shown in fig. 8 (a). To switch the beam to the edge port (upper left or upper right port), the spot sweeps across a width in the x-direction ofThe width of sweep in the y direction isThe maximum diffraction deflection angle in the x direction generated by the corresponding block on the first LCOS chip 3 is required to beThe maximum diffraction deflection angle in the y direction is。
When the prism group is added in front of the LCOS chip and the first prism group 2 and the second prism group 5 adopt the structure shown in fig. 4, the equivalent optical path is shown in fig. 7 (b). The two groups of light beams generated by polarization diversity are refracted by the first prism group and reflected by the first LCOS chip 3 and then converged in the middle of the concave reflector 4. The introduction of the first prism set will impart an additional inward deflection to the light beams such that the two polarized light beams no longer impinge on the middle of the LCOS chip. The two groups of light beams intersect and are respectively incident on the center positions of the upper and lower half areas of the second LCOS chip 6, as shown in fig. 8 (b). For the same beam, it will pass through the opposite half-areas of the first LCOS chip 3 and the second LCOS chip 6, respectively, i.e. the upper half-area at a time and the lower half-area at a time. The second prism set 5 is identical to the first prism set 2 in structure to counteract the additional deflection imparted to the beam by the first prism set 2, reducing the deflection angle required by the second LCOS chip 6. The final two sets of beams are received by the optical rear end 7 at an angle parallel to the exit of the optical front end 1.
When the first prism group 2 and the second prism group 5 adopt the structure shown in fig. 5, the equivalent optical path is as shown in fig. 7 (c). Since the introduction of the first prism group will apply an extra deflection to the light beam outwards, the two groups of light beams generated by polarization diversity will be respectively diverged to the upper and lower regions of the concave mirror 4 after being refracted by the first prism group and reflected by the first LCOS chip 3. The two groups of light beams no longer intersect and are respectively incident on the center positions of the upper and lower half areas of the second LCOS chip 6, as also shown in fig. 8 (b). For the same beam, it will pass through the same half area of the first LCOS chip 3 and the second LCOS chip 6, i.e. through the upper half area twice or through the lower half area twice, respectively. The second prism set 5 is identical to the first prism set 2 in structure to counteract the additional deflection imparted to the beam by the first prism set 2, reducing the deflection angle required by the second LCOS chip 6. The final two sets of beams are received by the optical rear end 7 at an angle parallel to the exit of the optical front end 1.
To switch the beam to the edge port, the spot sweeps across a width in the x-direction ofThe width of sweep in the y direction isThe maximum diffraction deflection angle in the x direction generated by the corresponding block on the first LCOS chip 3 is required to beThe maximum diffraction deflection angle in the y direction isWherein, the method comprises the steps of, wherein,Is the focal length of the concave mirror,For the number of ports at the optical front-end,The pixel area size allocated to a single port on the first LCOS chip.
It can be seen that after the prism group is arranged in front of the LCOS chip, the requirement on the diffraction deflection angle of the LCOS chip is reduced, the diffraction efficiency is further increased, and the loss of the matrix switch is reduced. Alternatively, in the case where the diffraction deflection angle of the LCOS chip is fixed, such an optical design can realize a matrix switch with a larger number of ports.
Taking a 4K LCOS chip as an example, the resolution is 4096×2240, the pixel pitch is 3.6 μm, and the overall size is 14.75mm×8.06mm. Since the LCOS chip is divided into an upper half area and a lower half area, the corresponding size of each half area is 7.38mm multiplied by 8.06mm. Let concave mirror focal length be 30mm, then the maximum deflection angle is:
Therefore, the maximum diffraction deflection angle corresponding to the structure shown in fig. 7 (a) is 7.98 °.
In fig. 8 (b), the light spot distribution positions on the second LCOS chip 6 correspond to those of the structures shown in fig. 7 (b) and (c), and two polarized light beams are respectively incident on the middle of the upper and lower half areas of the second LCOS chip 6. The maximum deflection angle at this time is:
the maximum diffraction deflection angle corresponding to the structures shown in fig. 7 (b) and (c) was 5.20 °. The maximum deflection angle was reduced by 34.8% compared to the structure of fig. 7 (a).
When the maximum deflection angle of the LCOS is unchanged, assuming that the number of ports corresponding to the structure shown in fig. 7 (a) is 5×11, the number of ports corresponding to the structures shown in fig. 7 (b) and (c) is 10×11, which is 100% greater than the number of ports of the structure shown in fig. 7 (a).
The application also provides optical communication equipment which comprises the large-port-number matrix optical switch and the circuit control board, wherein the circuit control board is used for providing phase regulation signals for a first LCOS chip and a second LCOS chip in the large-port-number matrix optical switch.
It is to be understood that the terms such as "comprises" and "comprising," which may be used in this application, indicate the presence of the disclosed functions, operations or elements, and are not limited to one or more additional functions, operations or elements. In the present application, terms such as "comprising" and/or "having" may be construed to mean a particular feature, number, operation, constituent element, component, or combination thereof, but may not be construed to exclude the presence or addition of one or more other features, numbers, operations, constituent elements, components, or combination thereof.
Furthermore, in the present application, the expression "and/or" includes any and all combinations of the words listed in association. For example, the expression "a and/or B" may include a, may include B, or may include both a and B.
In describing embodiments of the present application, it should be noted that the term "coupled" should be interpreted broadly, unless explicitly stated or limited otherwise, and for example, the term "coupled" may be either detachably coupled or non-detachably coupled, or may be directly coupled or indirectly coupled via an intermediate medium. Wherein, "fixedly connected" means that the relative positional relationship is unchanged after being connected with each other. "rotationally coupled" means coupled to each other and capable of relative rotation after coupling. "slidingly coupled" means coupled to each other and capable of sliding relative to each other after being coupled. References to directional terms in the embodiments of the present application, such as "top", "bottom", "inner", "outer", "left", "right", etc., are merely with reference to the directions of the drawings, and thus are used in order to better and more clearly illustrate and understand the embodiments of the present application, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.
In addition, in embodiments of the present application, the mathematical concepts mentioned are symmetrical, equal, parallel, perpendicular, etc. These definitions are all for the state of the art and not strictly defined in a mathematical sense, allowing for minor deviations, approximately symmetrical, approximately equal, approximately parallel, approximately perpendicular, etc. For example, a is parallel to B, meaning that a is parallel or approximately parallel to B, and the angle between a and B may be between 0 degrees and 10 degrees. A and B are perpendicular, which means that the angle between A and B is between 80 degrees and 100 degrees.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The large-port-number matrix optical switch based on the prism group is characterized by comprising an optical front end, a first prism group, a first LCOS chip, a concave reflector, a second prism group, a second LCOS chip and an optical rear end which are sequentially arranged along a plane W-shaped optical path;
The first LCOS chip and the second LCOS chip are both arranged on the focal plane of the concave reflector, and form a 2F optical system together;
The first prism group and the second prism group are consistent in structure, the first prism group applies additional deflection with the same size and opposite directions to two groups of parallel line polarized lights after polarization diversity of each port at the optical front end through refraction on an xz plane, and the second prism group applies additional deflection with the same size and opposite directions to the line polarized lights after reflection by the concave reflector through refraction on the xz plane, so that the line polarized lights are corrected to be parallel to each other;
On the premise that the driving voltage is not applied to the first LCOS chip and the second LCOS chip, two groups of parallel light beams generated by polarization diversity of each port at the optical front end are sequentially refracted through the first prism group, reflected by the first LCOS chip, reflected by the concave mirror and refracted by the second prism group, and then respectively incident on the central positions of the upper half area and the lower half area of the second LCOS chip.
2. The large port number matrix optical switch of claim 1 wherein the distance between the first prism set and the first LCOS chip ranges from 0,1mm and the distance between the second prism set and the second LCOS chip ranges from 0,1 mm.
3. The large-port-number matrix optical switch of claim 1, wherein the following two conditions are satisfied between the first prism group, the first LCOS chip and the concave mirror:
Wherein, Is an optical front end x the number of rows of directional ports,For the pixel area side length on the first LCOS chip assigned to a single port,Is the focal length of the concave mirror,For the angle between the incident light and the normal of the incident surface of the first prism group,For the angle between the emergent light and the normal line of the emergent surface of the first prism group,Is the refractive index of the first prism group.
4. A large port number matrix optical switch according to claim 3 wherein said first prism group is formed by gluing two identical four prisms, said four prisms being right trapezoid in side view, the right thick ends of the two four prisms being aligned to form a first prism group in the shape of a roof ridge.
5. A large port number matrix optical switch according to claim 3 wherein said first prism group is formed by two identical triangular prisms, said triangular prisms being right triangular in side view, the thin ends of the two triangular prisms being aligned to form a V-shape.
6. The large port number matrix optical switch of claim 1 wherein the thickness of the thinnest portion of the prism set is no less than 0.3mm.
7. The large port number matrix optical switch of claim 1 wherein the first prism group is rectangular in plan view, the rectangular having a length at least 2mm greater than the length of the first LCOS chip and a width at least 2mm greater than the width of the first LCOS chip.
8. The large port number matrix optical switch of claim 1 wherein the optical front end comprises a two-dimensional collimator array, a polarizing beam splitter prism, a compensation block, and a half wave plate, wherein,
The two-dimensional collimator array comprises a plurality of ports, each port is used for converting a small-light-spot divergent beam at the output end of the optical fiber into a large-light-spot collimated beam, and the large-light-spot collimated beam enters the polarization beam splitting prism;
The polarization beam splitting prism is used for transmitting p waves and reflecting s waves so as to obtain two beams of linear polarized light which are parallel to each other and have orthogonal polarization states after an incident beam of random polarized light passes through polarization beam splitting, wherein one beam of light passes through the compensation block to compensate the optical path difference of the two beams of light, the polarization state of the light passes through the half wave plate to rotate by 90 degrees, and finally the two beams of light are parallel to each other and have the same polarization state, so that polarization diversity is realized.
9. The large port number matrix optical switch of claim 1 wherein the corresponding block on the first LCOS chip produces an x-direction maximum diffraction deflection angleMaximum diffraction deflection angle in y directionWherein, the method comprises the steps of, wherein,Is the focal length of the concave mirror,Representing the optical front end x the number of rows of directional ports,Indicating the number of columns of ports in the Y-direction of the optical front,The side length of the pixel area allocated to a single port on the first LCOS chip.
10. An optical communication apparatus comprising the large-port-number matrix optical switch according to any one of claims 1 to 9 and a circuit control board;
the circuit control board is used for providing phase regulation signals for a first LCOS chip and a second LCOS chip in the large-port-number matrix optical switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411686383.2A CN119179141B (en) | 2024-11-25 | 2024-11-25 | Large-port-count matrix optical switch and optical communication equipment based on prism group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411686383.2A CN119179141B (en) | 2024-11-25 | 2024-11-25 | Large-port-count matrix optical switch and optical communication equipment based on prism group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN119179141A CN119179141A (en) | 2024-12-24 |
| CN119179141B true CN119179141B (en) | 2025-03-18 |
Family
ID=93903700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411686383.2A Active CN119179141B (en) | 2024-11-25 | 2024-11-25 | Large-port-count matrix optical switch and optical communication equipment based on prism group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119179141B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116466496A (en) * | 2023-04-24 | 2023-07-21 | 安徽共芯光子科技有限公司 | A polarization splitting and conversion device and wavelength selective switch |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011028235A (en) * | 2009-06-26 | 2011-02-10 | Nippon Telegr & Teleph Corp <Ntt> | Optical switch |
| CN107367796A (en) * | 2017-09-14 | 2017-11-21 | 贝耐特光学科技（昆山）有限公司 | A kind of wavelength-selective switches |
| CN107850736A (en) * | 2015-07-31 | 2018-03-27 | 华为技术有限公司 | A kind of optical cross-connect |
| WO2024001619A1 (en) * | 2022-06-30 | 2024-01-04 | 华为技术有限公司 | Wavelength selective switch, beam transmission direction scheduling method, and optical switching node |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3656696B2 (en) * | 1997-11-04 | 2005-06-08 | セイコーエプソン株式会社 | Optical scanning device |
| CN1249471C (en) * | 2000-02-01 | 2006-04-05 | J·J·斯奈德 | Single channel M×N fiber optic switch |
| CN102590952B (en) * | 2012-02-29 | 2013-05-22 | 华中科技大学 | Multi-channel dynamic optical dispersion compensator |
| CN104155723B (en) * | 2014-08-25 | 2016-10-26 | 华中科技大学 | A kind of optical switch module based on wedged liquid crystal cell |
| CN221884070U (en) * | 2024-03-28 | 2024-10-22 | 贝耐特光学科技(苏州)有限公司 | 8×8 optical switch system |
-
2024
- 2024-11-25 CN CN202411686383.2A patent/CN119179141B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011028235A (en) * | 2009-06-26 | 2011-02-10 | Nippon Telegr & Teleph Corp <Ntt> | Optical switch |
| CN107850736A (en) * | 2015-07-31 | 2018-03-27 | 华为技术有限公司 | A kind of optical cross-connect |
| CN107367796A (en) * | 2017-09-14 | 2017-11-21 | 贝耐特光学科技（昆山）有限公司 | A kind of wavelength-selective switches |
| WO2024001619A1 (en) * | 2022-06-30 | 2024-01-04 | 华为技术有限公司 | Wavelength selective switch, beam transmission direction scheduling method, and optical switching node |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119179141A (en) | 2024-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11442151B2 (en) | Holographic waveguide LIDAR | |
| US5648859A (en) | Liquid crystal microprism array, free-space optical interconnector, and optical switch | |
| US20220342051A1 (en) | Tof depth sensing module and image generation method | |
| US6954252B1 (en) | Optical switch including two integrated multiphase SLM's and a wave-plate the wave-plate providing an optical retardance of (2n+1)λ/4 | |
| US5963682A (en) | Optical beam steering system | |
| CN101772721A (en) | Optical arrangement for generating multi-beams | |
| CN110646959B (en) | Reflective circulator | |
| WO2022052431A1 (en) | Lightweight optical antenna, and method for realizing capturing and tracking based on same | |
| CN101576697A (en) | Electro-optic Switch Array Digital Optical Scanner | |
| CN119179141B (en) | Large-port-count matrix optical switch and optical communication equipment based on prism group | |
| CN109085558B (en) | Phased array laser radar and control method thereof | |
| WO2023231859A1 (en) | Liquid crystal device, and optical modulation device and system | |
| CN114994908B (en) | Lens-assisted two-dimensional light beam scanning device | |
| CN110147001B (en) | Optical circulator | |
| CN119200097B (en) | Large-scale matrix optical switches and optical communication equipment based on 4f optical system | |
| US6704474B1 (en) | Optical beam steering system | |
| CN116184738A (en) | A two-dimensional optical phased array scanning expansion device and its application | |
| CN223539035U (en) | A novel wavelength selective switch | |
| CN119376022B (en) | A wavelength selective switch | |
| CN119179140B (en) | Compact matrix optical switch and optical communication device based on two-dimensional prism group | |
| US11327381B2 (en) | Light beam switching element, assembly of same, and control method for same | |
| CN116647284A (en) | A multi-target optical phased array laser communication system | |
| CN110764285B (en) | Photoelectric hybrid device | |
| CN120568234B (en) | OCS optical switch based on LCOS | |
| WO2017020197A1 (en) | Optical cross-connector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |