CN111562653A - Multicore fiber exchanger based on array MEMS reflector - Google Patents
Multicore fiber exchanger based on array MEMS reflector Download PDFInfo
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- CN111562653A CN111562653A CN202010282329.7A CN202010282329A CN111562653A CN 111562653 A CN111562653 A CN 111562653A CN 202010282329 A CN202010282329 A CN 202010282329A CN 111562653 A CN111562653 A CN 111562653A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3564—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details
- G02B6/3584—Mechanical details of the actuation mechanism associated with the moving element or mounting mechanism details constructional details of an associated actuator having a MEMS construction, i.e. constructed using semiconductor technology such as etching
Abstract
The invention provides a multi-core optical fiber exchanger based on an array MEMS reflector. The multi-core optical fiber exchanger is composed of an array MEMS reflector base, a base shell, an array MEMS reflector, a deflection optical window shell, a collimation micro-lens array, an input-output optical fiber array and an MEMS reflector control driving board. The input and output optical fiber array is composed of an N (N is an integer larger than 1) core optical fiber positioned in the center and M (M is an integer larger than or equal to 1) N core optical fibers surrounding the periphery. The array MEMS reflector is composed of N reflectors which can rotate along two mutually perpendicular rotating shafts. The light input by the input and output optical fiber array is collimated by the collimating micro-lens array, deflected by the array MEMS reflector and coupled into the input and output optical fiber array by the collimating micro-lens array for output. The invention can be widely used in the fields of multi-core optical fiber sensing, optical communication and the like.
Description
(I) technical field
The invention relates to a multi-core optical fiber exchanger based on an array MEMS reflector, belonging to the technical field of optical communication, passive optical devices, multi-core optical fiber devices, optical signal exchange and optical fiber sensing.
(II) background of the invention
As a last virgin area where the space division multiplexing multi-core optical fiber becomes further to increase the communication capacity of the optical fiber, the multi-core optical fiber has attracted attention in recent years, and there have been a lot of studies on solving the increase in the capacity expansion rate. The core of the multi-core fiber is critical and comprises the problems of coupling and crosstalk among cores, the transmission characteristic and the bending characteristic of the multi-core fiber, the beam splitting and connecting technology of the multi-core fiber, the cone coupling technology of the multi-core fiber and the like. The multi-core optical fiber also has a plurality of applications in the sensing field, such as subway network systems, radio base stations, connection data center base plates, chip communication systems, novel optical fiber amplifiers, underground sensing in oil exploration and pipeline detection.
The novel space division multiplexing technology using the multi-core optical fiber as the carrier fully utilizes the dimension of space, can effectively improve the transmission capacity of a single optical fiber, and is verified in an ultra-high capacity long-distance optical fiber transmission system and attracts the wide attention of the industry. Multi-core fibers have advantages from the space saving aspect to the ability to improve high speed communications, making them more compact, flexible, and customizable. The multi-core optical fiber has the characteristics of small size, space distribution of the fiber core, good thermal stability and the like; the internal structure of a Micro-Electro-mechanical system (MEMS) is generally in the micrometer or even nanometer scale, and also has the characteristic of small size. The multi-core optical fiber exchanger has the important advantages of small structural size, low insertion loss, low crosstalk and long-term stability.
Patent No. CN110868651A proposes an all-optical switching device, which includes a housing, an optical switching unit, and more than 2 sets of input collimators and output collimators. The switching of the optical path of the all-optical switching device is realized by adopting a mechanical control mode, and the all-optical switching device not only has the characteristics of low insertion loss, high isolation, no light in wavelength and polarization and the like, but also can reduce the volume and the complexity of the all-optical switching device. The device can realize the optical exchange among standard single-mode fibers, but cannot realize the optical exchange among fiber cores of more than two multi-core fibers, still has larger volume and is inconvenient to integrate.
Patent No. CN110658588A proposes a multifunctional optical switch and a control method thereof, which includes an input optical fiber, a coupling collimator, an off-axis parabolic mirror, and an output optical fiber. The optical coupling device is based on the optical characteristics of aberration elimination of a coupling collimating lens and an off-axis parabolic mirror, and can realize the coupling of optical fiber beams output from any position on a cylindrical surface with the central axis coaxial with the central axis of the cylindrical surface and the surface coincident with the focal point of the off-axis parabolic mirror by rotating and moving the off-axis parabolic mirror along the central axis of the cylindrical surface, so that coupling space resources are output by utilizing an optical switch to the maximum extent, and the number of optical coupling lenses and the structural design cost are reduced. The multi-fiber laser has the defect that the multi-fiber laser is mainly suitable for multi-option output occasions of single fiber lasers with different requirements on optical fiber output beams in various laser processing applications, and optical exchange between fiber cores of more than two multi-core fibers cannot be realized.
With the development of multi-core optical fibers and the improvement of sensing technologies, sensing or information acquisition is generally performed on different fiber cores of a multi-core optical fiber, then information of each fiber core is analyzed independently to avoid mutual interference of different information, and then the acquired information is analyzed and processed in a unified manner, for example, a three-dimensional shape sensing technology based on the multi-core optical fiber; or information needs to be injected or collected into different fiber cores of the multi-core fiber in a time-sharing manner, so that great practical requirements are provided for realizing light exchange among the multi-core fibers; the multi-core optical fiber exchanger can effectively enrich the application of the multi-core optical fiber.
Disclosure of the invention
The invention aims to provide a multicore optical fiber exchanger based on an array MEMS reflector.
The purpose of the invention is realized as follows:
a multi-core fiber switch based on array MEMS reflectors is shown in fig. 1. The multi-core optical fiber exchanger comprises an array MEMS reflector base 1, an array MEMS reflector 2, a base shell 3, a deflection optical window shell 4, a collimation micro-lens array 5, an input-output optical fiber array 6 and an MEMS reflector control driving board; the switching function of the multi-core optical fiber switch can be realized by controlling the control driving board of the multi-core optical fiber switch.
The array MEMS reflector 2 is composed of N (N is an integer larger than 1) reflectors which can rotate in a certain angle along two mutually perpendicular rotating shafts, and each reflector is aligned with the corresponding fiber core and the center of the collimating micro-lens.
The rotation angle of each reflector in the array MEMS reflector 2 can be independently controlled by a multicore fiber switch control driving plate.
The multi-core optical fiber exchanger control driving board consists of a controller interface and an MEMS driving board, and the MEMS driving board is connected with a pin led out from a base 1 of the array MEMS reflector.
The collimating micro-lens array 5 consists of a collimating micro-lens array substrate 5-2 and collimating micro-lenses 5-1 on the substrate, wherein each collimating micro-lens 5-1 corresponds to a multi-core optical fiber core, and can collimate light emitted from an optical fiber end into parallel light to be incident on the array MEMS reflector 2 and also can couple the parallel light reflected by the array MEMS reflector 2 into the optical fiber core.
The input/output optical fiber array 6 is composed of an N-core optical fiber located at the center of the array, M (M is an integer greater than or equal to 1) N-core optical fibers surrounding the N-core optical fiber, and a hard sleeve, wherein the multi-core optical fiber is fixed in the hard sleeve. The maximum value of the number M of multicore fibers depends on the maximum deflection angle and distribution pitch of the MEMS reflector 2. When the fiber core distance of the multi-core optical fiber is fixed, the larger the maximum deflection angle of the MEMS reflector 2 is, the larger the maximum value of the number M of the multi-core optical fibers is; when the maximum deflection angle of the MEMS reflector 2 is fixed, the smaller the fiber core distance of the multi-core fibers is, the larger the maximum value of the number M of the multi-core fibers is.
The input and output optical fiber array 6 can be arranged in a triangular mode or in a rectangular or circular mode; the section of the hard sleeve can be a circular section or a triangular section or a rectangular section.
The multi-core fiber can be a few-core fiber such as a double-core fiber and a three-core fiber, or a multi-core fiber with higher density and more fiber cores such as a 38-core fiber.
The multicore optical fiber exchanger based on the array MEMS reflector inputs optical signals of the multicore optical fiber exchanger through each fiber core of the multicore optical fiber in the middle of the input and output optical fiber array 6, the optical signals are emitted from the multicore optical fiber, immediately pass through the deflection optical window 4-1 after being collimated by the collimation micro-lens array 5, are reflected back to the deflection optical window 4-1 by the array MEMS reflector 2 at corresponding deflection angles respectively, and are coupled into the fiber cores of the surrounding multicore optical fibers corresponding to the input and output optical fiber array 6 through the collimation micro-lens array 5.
The multicore fiber exchanger based on the array MEMS reflector inputs optical signals of the multicore fiber exchanger from each fiber core of the multicore fibers around the input and output fiber array 6, the optical signals are emitted from the peripheral multicore fibers, are immediately collimated by the collimating micro-lens array 5, then obliquely enter the array MEMS reflector 2 into the deflection optical window 4-1, are reflected back to the deflection optical window 4-1 by the array MEMS reflector 2 at corresponding deflection angles respectively, and are coupled into each fiber core of the multicore fibers in the middle of the input and output fiber array 6 by the collimating micro-lens array 5.
The invention has the beneficial effects that:
1. the device integration level is high, and the fiber core density of the multi-core optical fiber can be effectively improved through the highly integrated device.
2. Compared with the prior art, the invention can adopt the MEMS reflector technology, not only has the characteristics of high reaction speed, low loss and small volume, but also can effectively keep the consistency of each fiber core channel or the difference of special requirements for a long time because each MEMS reflector can be independently adjusted and is slightly influenced by the temperature, the humidity and the like of the external environment, thereby being particularly suitable for the multi-core optical fiber sensing application.
3. After the encapsulation is finished, the manufacture of the multi-core optical fiber exchanger can be finished only by adjusting the angle of the array MEMS reflector, the yield of the multi-core optical fiber exchanger is improved, the redundant design is convenient, and the later-period device maintenance is convenient.
4. The invention can realize the multicore fiber exchange design based on the array MEMS reflector and can be used for fiber core light exchange among multicore fibers.
(IV) description of the drawings
Fig. 1 is a structural schematic diagram of a seven-core optical fiber exchanger based on an array MEMS reflector. This embodiment is an input-output fiber array 6 composed of two seven-core fibers. The reference numbers in the figures are: the array MEMS optical reflector comprises a base 1 of the array MEMS optical reflector, an array MEMS reflector 2, a base shell 3, a deflection optical window shell 4, a deflection optical window 4-1, a collimation micro-lens array 5, a collimation micro-lens 5-1, a collimation micro-lens array substrate 5-2, an input and output optical fiber array 6, a seven-core optical fiber 7-1 positioned in the center of the input and output optical fiber array 6, fiber cores 7-1-7-1-7 of the seven-core optical fiber 7-1, surrounding seven-core optical fibers 7-2, and fiber cores 7-2-1-7-2-7 of the seven-core optical fiber 7-2.
Fig. 2 is a structural diagram of an array MEMS reflector 2 of a seven-core fiber switch based on the array MEMS reflector. Reference numerals are shown for MEMS reflectors 2-1 to 2-7.
Fig. 3 is a block diagram of a seven-core fiber switch based on an array MEMS reflector.
Fig. 4 is an operational optical path diagram of a seven-core fiber switch based on an array MEMS reflector.
Figure 5 is a diagram of a seven-core fiber switch package based on an array MEMS reflector.
Fig. 6 is a cross-sectional view of an input-output fiber array 6 of a two-core fiber switch based on an array MEMS reflector.
Fig. 7 is a cross-sectional view of an input-output fiber array 6 of a three-core fiber switch based on an array MEMS reflector.
Fig. 8 is a cross-sectional view of an input-output fiber array 6 of a four-core fiber switch based on an array MEMS reflector. Wherein the four-core optical fiber in fig. 8(a) is a centrosymmetric four-core optical fiber; the four-core fiber in fig. 8(b) is a four-core fiber having a rectangular core distribution.
Fig. 9 is a cross-sectional view of an input-output fiber array 6 of a five-core fiber switch based on an array MEMS reflector.
FIG. 10 is a cross-sectional view of an input-output fiber array 6 of a seven-core fiber switch based on array MEMS reflectors; FIG. 10(a) is a seven-core fiber exchanger using a circular section rigid ferrule and the fibers in the input-output fiber array 6 are arranged in a rectangular shape; FIG. 10(b) is a seven-core fiber exchanger using a circular section rigid sleeve and the fibers in the input and output fiber array 6 are arranged in a triangular shape; FIG. 10(c) is a seven-core fiber switch using a rigid ferrule with a rectangular cross section and the fibers in the input-output fiber array 6 are arranged in a rectangular shape; fig. 10(d) shows a seven-core optical fiber exchanger using a rigid ferrule with a rectangular cross section and the optical fibers in the input/output optical fiber array 6 are arranged in a triangular shape.
FIG. 11 is a cross-sectional view of an input-output fiber array 6 of a 19-core fiber switch based on array MEMS reflectors.
(V) detailed description of the preferred embodiments
The working principle of the invention is explained in the following with the accompanying drawings and specific embodiments to further explain the invention.
Example 1: a seven-core fiber switch based on array MEMS reflectors.
The structure schematic diagram of the seven-core optical fiber switch based on the array MEMS reflector is shown in FIG. 1, and comprises an array MEMS reflector 2, a base housing 3, a deflection light window housing 4, a collimation micro-lens array 5, an input-output optical fiber array 6 and a MEMS reflector control driving board (not shown). Wherein the input and output optical fiber array 6 comprises two seven-core optical fibers.
Techniques for fabricating MEMS reflectors 2 are well known and are preferably implemented as high performance arrayed MEMS reflectors 2, two-dimensional reflectors in which each reflector in the array can be individually controlled, and which are small in size, fast, stable and fast. With respect to the arrayed MEMS reflector 2, the present invention has particular features that are employed to yield the superior performance of the preferred embodiments of the present invention. In this embodiment, the present device uses a special distribution form of the array MEMS reflectors 2 as shown in the structural diagram of the array MEMS reflector 2 in fig. 2, as a multicore fiber switch, in order to match multicore fibers with different fiber numbers, the array MEMS reflector 2 is almost identical to the fiber core distribution of the multicore fibers used by the device, so as to reduce the deflection angles of the different MEMS reflectors 2 in the array, and to ensure that all the array MEMS reflectors 2 are kept in the same plane, so as to facilitate the manufacturing of the array.
In the present embodiment, a collimating micro-lens array 5 as shown in fig. 1 is provided, the collimating micro-lens array 5 can be precisely manufactured by using a flat etching technique, and has the characteristics of small diameter and short focal length, the collimating micro-lenses 5-1 are arranged on a collimating micro-lens array substrate 5-2 (the middle spacing substrate is not shown), and the substrate can be made of quartz, which is convenient for manufacturing and installation. When mounting the collimator microlens substrate 5-2, the substrate is uniquely defined to be mounted in the deflection light window, and at the same time, the collimator microlens array 5 on the substrate is precisely defined at an accurate position.
With respect to the collimating microlens array 5, the present invention has particular features that are employed to produce the superior performance of the preferred embodiments of the present invention. In this embodiment, the device adopts a special distribution form of the collimating micro-lens array 5 as shown in fig. 1 as a multi-core fiber exchanger, in order to match multi-core fibers with different fiber core numbers, it is ensured that light beams emitted from each fiber core in the middle multi-core fiber can pass through one collimating micro-lens 5-1, and are well collimated and then emitted to the MEMS reflector 2, and then parallel light beams reflected from the MEMS reflector 2 can be coupled into different fiber cores of other multi-core fibers through the collimating micro-lens 5-1 to complete multi-core fiber light exchange; meanwhile, the light beams emitted from different fiber cores of the adjacent multicore fibers can pass through a collimating micro-lens 5-1 and are well collimated and then emitted to the MEMS reflector 2, and then the parallel light beams reflected from the MEMS reflector 2 can be coupled into different fiber cores of the middle multicore fiber through the collimating micro-lens 5-1. Therefore, the collimating micro-lens array 5 must correspond to the number and distribution of the multicore fibers used by the device, and the core distributions of the multicore fibers one to one, so as to realize the collimation and coupling of the multicore fibers.
The following is a detailed description of a preferred parameter.
The schematic cross-sectional structure of the input and output optical fiber array 6 is shown in fig. 1, and comprises two seven-core optical fibers at the same height, wherein one seven-core optical fiber is positioned at the center of the input and output optical fiber array 6 and is numbered as 7-1, the remaining seven-core optical fiber is positioned at the same horizontal height as the 7-1 and is numbered as 7-2 at the right side, and the distance between the two seven-core optical fibers is 100 micrometers; the fiber core distribution of the selected seven-core optical fiber 7-1 is shown in figure 1, the numbers are respectively 7-1-1 to 7-1-7 from the left lower part, the middle core is 7-1-4, the middle core 7-1-4 is positioned in the center of the seven-core optical fiber, the rest six cores are distributed at six vertexes of a regular hexagon, and the straight lines of the fiber cores 7-1-3, 7-1-4 and 7-1-5 are mutually vertical to the straight lines of the two seven-core optical fibers; the fiber core of the selected seven-core optical fiber 7-2 is 7-2-1 to 7-2-7 from the left bottom, the number of the fiber core is 7-2-1 to 7-2-7, the number of the middle core is 7-2-4, the middle core 7-1-4 is positioned in the center of the seven-core optical fiber, and the rest six cores are distributed at six vertexes of a regular hexagon; the diameter of each of the two seven-core optical fibers is 125 microns, and the uniform distance between the fiber cores is 35 microns. On the cross section of the input and output optical fiber array 6, a rectangular plane coordinate system is established by selecting a middle core 7-1-4 of the seven-core optical fiber 7-1 as a coordinate origin, the direction of the seven-core optical fiber 7-2 as the positive direction of an X axis, and the direction of an upper core 7-1-5 of the seven-core optical fiber 7-1 as the positive direction of a Y axis. The core center coordinates of the respective cores of the seven-core optical fibers 7-1 and 7-2 at this time are shown in the following table:
unit: micron meter
Each MEMS reflector in the array MEMS reflector 2 can be independently controlled, as shown in fig. 2, and each MEMS reflector has two mutually perpendicular rotating shafts, for convenience of description, the switch is horizontally placed, the rotating shaft in the horizontal direction is a b-axis, the MEMS reflector rotates upward to be defined as a positive b-axis direction, at this time, the b-axis rotation angle is a positive number, the MEMS reflector rotates downward to be defined as a negative b-axis direction, at this time, the b-axis rotation angle is a negative number; the rotating shaft in the vertical direction is an a-axis, the MEMS reflector rotates rightwards to be defined as the positive direction of the a-axis, the rotating angle of the a-axis is a positive number, the MEMS reflector rotates leftwards to be defined as the negative direction of the a-axis, and the rotating angle of the a-axis is a negative number. The distribution of the array MEMS reflector 2 strictly corresponds to the fiber core distribution of the multicore fiber, and the numbers are from 2-1 to 2-7 from the left bottom and from 2-4 at the center.
The basic workflow of a seven-core fiber switch based on arrayed MEMS reflectors is shown in fig. 3 and is specifically implemented as such. After the multicore optical fiber exchanger is started, the fiber core needing optical switching can be selected by a user, and can also be read according to a preset program or a program self-programmed by the user, the preset deflection angle of the array MEMS reflector 2 is corrected in advance by using a controller control interface, a corresponding control signal is output and transmitted to an MEMS drive board, the MEMS drive board is converted into a corresponding driving voltage or current according to the received control signal and transmitted to the array MEMS reflector 2, and the deflection of the array MEMS reflector 2 is controlled to the preset angle.
If the function of the device is to switch the optical signals in the central seven-core fiber 7-1 of the input-output fiber array 6 to the different cores of the surrounding seven-core fibers 7-2, then a switching method that can be used but is not the only one is such that the basic principle of the optical path is illustrated by the schematic cross-sectional view of the switch, as shown in fig. 4. Taking the side core 7-1-2 and the middle core 7-1-4 of the middle seven-core optical fiber 7-1 as an example, light emitted from the side core 7-1-2 of the seven-core optical fiber 7-1 is collimated into parallel light after passing through the collimating micro lens 5-1, enters the space of the deflecting optical window 4-1 through the collimating micro lens array substrate 5-2, reaches the MEMS reflector 2-2 which has been deflected to a preset angle, enters the space of the deflecting optical window 4-1 through the reflection of the MEMS reflector 2-2, passes through the collimating micro lens array substrate 5-2, and is coupled into the side core 7-2-7 of the seven-core optical fiber 7-2 by the collimating micro lens 5-1. Light emitted from a middle core 7-1-4 of the seven-core optical fiber 7-1 is collimated into parallel light after passing through a collimating micro lens 5-1, enters a space of a deflecting light window 4-1 through a collimating micro lens array substrate 5-2, reaches an MEMS reflector 2-4 deflected to a preset angle, enters a space of the deflecting light window 4-1 through reflection of the MEMS reflector 2-4, passes through the collimating micro lens array substrate 5-2, and is coupled into a side core 7-2-2 of the seven-core optical fiber 7-2 by the collimating micro lens 5-1.
Based on the same principle, other fiber core optical paths of the seven-core optical fiber 7-1 are transmitted to the corresponding fiber core paths of the collimating micro-lens 5-1, the collimating micro-lens array substrate 5-2, the deflecting optical window 4-1, the array MEMS reflector 2, the deflecting optical window 4-1, the collimating micro-lens array substrate 5-2, the collimating micro-lens 5-1 and the seven-core optical fiber 7-2 according to different fiber cores of the seven-core optical fiber 7-1, and therefore the multi-core optical fiber exchange is completed. The complete correspondence is as follows:
in order to complete the above optical path, if the length of the deflection optical window is 2000 μm, the theoretical deflection angle of each MEMS reflector at this time is as follows:
unit: degree of rotation
If the function of the device is to switch light in the side seven-core fibers 7-2 of the input and output fiber array 6 to different cores in the middle seven-core fiber 7-1 of the input and output fiber array 6, one way of switching but not the only way of switching. The corresponding relationship is as follows:
if the function of the device is to switch the optical signals in the seven-core fiber 7-2 beside the input and output fiber array 6 to the different cores of the middle seven-core fiber 7-1, then this is one way of switching that can be used but not the only way. Taking the side core 7-2-1 and the middle core 7-2-4 of the seven-core optical fiber 7-2 as an example, light emitted from the side core 7-2-2 of the seven-core optical fiber 7-2 is collimated into parallel light after passing through the collimating micro lens 5-1, enters the space of the deflecting optical window 4-1 through the collimating micro lens array substrate 5-2 and the oblique array MEMS reflector 2, reaches the MEMS reflector 2-7 which has been deflected to a preset angle, enters the space of the deflecting optical window 4-1 through the reflection of the MEMS reflector 2-7, passes through the collimating micro lens array substrate 5-2, and is coupled into the side core 7-1-7 of the seven-core optical fiber 7-1 by the collimating micro lens 5-1. Light emitted from a middle core 7-2-4 of the seven-core optical fiber 7-2 is collimated into parallel light after passing through a collimating micro-lens 5-1, passes through a collimating micro-lens array substrate 5-2, enters a space of a deflecting optical window 4-1 through an oblique array MEMS reflector 2, reaches an MEMS reflector 2-3 deflected to a preset angle, enters a space of the deflecting optical window 4-1 through reflection of the MEMS reflector 2-3, passes through the collimating micro-lens array substrate 5-2, and is coupled into a side core 7-1-3 of the seven-core optical fiber 7-1 by the collimating micro-lens 5-1.
Based on the same principle, other fiber core optical paths of the seven-core optical fiber 7-2 are transmitted to the corresponding fiber core paths of the collimating micro-lens 5-1, the collimating micro-lens array substrate 5-2, the deflecting optical window 4-1, the array MEMS reflector 2, the deflecting optical window 4-1, the collimating micro-lens array substrate 5-2, the collimating micro-lens 5-1 and the seven-core optical fiber 7-1 according to different fiber cores of the seven-core optical fiber 7-2, and therefore the multi-core optical fiber exchange is completed.
In order to complete the above optical path, if the length of the deflection optical window is 2000 μm, the theoretical deflection angle of each MEMS reflector at this time is due to the slight change of the optical path, which corresponds to the following:
unit: degree of rotation
In order to ensure the good working state of the device, a redundancy design can be adopted, and a plurality of multi-core optical fibers can be configured as standby when the exchanger is designed. After the encapsulation of the seven-core fiber switch based on the array MEMS reflector is completed, as shown in FIG. 6, after the encapsulation of the device is completed, the deflection angle of each MEMS reflector can be corrected by using an online monitoring mode, so that the device can reach the optimal use condition.
Example 2: a dual-core fiber switch based on an array MEMS reflector.
The cross section of an input-output optical fiber array 6 of a dual-core optical fiber switch based on an array MEMS reflector is shown in FIG. 6, the principle is the same as that of embodiment 1, but the optical fiber switch uses three dual-core optical fibers as input and output.
Example 3: a three-core fiber switch based on an array MEMS reflector.
A three-core fiber switch based on array MEMS reflector has the cross section of the input/output fiber array 6 shown in FIG. 7, and the principle is the same as that of embodiment 1, but the fiber switch uses four three-core fibers as input/output.
Example 4: a four-core fiber switch based on an array MEMS reflector.
A four-core fiber switch based on an array MEMS reflector, in which the cross section of the input/output fiber array 6 is as shown in fig. 8(a), the principle is the same as that of embodiment 1, but the fiber switch uses five centrosymmetric four-core fibers as input/output.
A four-core fiber switch based on an array MEMS reflector, in which the cross section of the input/output fiber array 6 is as shown in fig. 8(b), the principle is the same as that of embodiment 1, but the fiber switch uses five four-core fibers with rectangular distribution of cores as input/output.
Example 5: a five-core fiber switch based on an array MEMS reflector.
The cross section of an input-output optical fiber array 6 of a five-core optical fiber switch based on an array MEMS reflector is shown in FIG. 9, the principle is the same as that of embodiment 1, but the optical fiber switch uses six five-core optical fibers as input and output.
Example 6: a seven-core fiber switch based on array MEMS reflectors.
A cross-sectional view of an input/output fiber array 6 of a seven-core fiber switch based on an array MEMS reflector is shown in FIG. 10, and the principle is the same as that of embodiment 1. FIG. 10(a) is a seven-core fiber exchanger using a circular section rigid ferrule and the fibers in the input-output fiber array 6 are arranged in a rectangular shape; FIG. 10(b) is a seven-core fiber exchanger using a circular section rigid sleeve and the fibers in the input and output fiber array 6 are arranged in a triangular shape; FIG. 10(c) is a seven-core fiber switch using a rigid ferrule with a rectangular cross section and the fibers in the input-output fiber array 6 are arranged in a rectangular shape; fig. 10(d) shows a seven-core optical fiber exchanger using a rigid ferrule with a rectangular cross section and the optical fibers in the input/output optical fiber array 6 are arranged in a triangular shape.
Example 7: a19-core fiber switch based on array MEMS reflectors.
A19-core fiber switch based on an array MEMS reflector is disclosed, wherein the cross-sectional view of an input-output fiber array 6 is shown in FIG. 11, the principle is the same as that of embodiment 1, the embodiment adopts a circular section rigid sleeve, and 19-core fibers in the input-output fiber array 6 are arranged in a triangular shape.
In the description and drawings, there have been disclosed typical embodiments of the invention. The invention is not limited to these exemplary embodiments. Specific terms are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being set forth.
Claims (8)
1. A multi-core fiber switch based on array MEMS reflectors is characterized in that: the multicore fiber exchanger based on the array MEMS reflector comprises an array MEMS reflector base, an array MEMS reflector, a base shell, a deflection optical window shell, a collimation microlens array, an input-output fiber array and a multicore fiber exchanger control drive board, wherein light input through input fibers in the input-output fiber array enters a deflection optical window after being collimated by the collimation microlens array, then is reflected by the array MEMS reflector, is coupled into output fibers in the input-output fiber array through the collimation microlens array, and is controlled by the multicore fiber exchanger control drive board to realize the exchange function of the multicore fiber exchanger.
2. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the array MEMS reflector is composed of N (N is an integer larger than 1) reflectors which can rotate in a certain angle along two mutually perpendicular rotating shafts, and each reflector is aligned with the corresponding fiber core and the center of the collimating micro-lens.
3. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the rotation angle of each reflector in the array MEMS reflector can be independently controlled by the multicore optical fiber switch control driving plate.
4. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the multi-core optical fiber exchanger control driving board consists of a controller interface and an MEMS driving board, and the MEMS driving board is connected with pins led out from a base of the array MEMS reflector.
5. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the collimating micro-lens array is composed of a collimating micro-lens array substrate and collimating micro-lenses on the substrate, each collimating micro-lens corresponds to a multi-core optical fiber core, and can collimate light emitted from an optical fiber end into parallel light to be incident on the array MEMS reflector and also can couple the parallel light reflected by the array MEMS reflector into the optical fiber core.
6. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the input and output optical fiber array consists of an N-core optical fiber positioned in the center of the array, M (M is an integer more than or equal to 1) N-core optical fibers surrounding the N-core optical fiber and a hard sleeve, and the multi-core optical fiber is fixed in the hard sleeve.
7. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the optical fiber arrangement mode of the input and output optical fiber array can be triangular arrangement or rectangular arrangement or circular arrangement; the section of the hard sleeve can be a circular section or a triangular section or a rectangular section.
8. The array MEMS reflector-based multicore fiber switch of claim 1, wherein: the multi-core fiber can be a few-core fiber such as a double-core fiber and a three-core fiber, or a multi-core fiber with higher density and more fiber cores such as a 38-core fiber.
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