阅读说明：本技术 一种用于数据中心的无线光通信收发一体化系统 (Wireless optical communication receiving and transmitting integrated system for data center ) 是由 丁德强 吴田宜 李源 周少华 杨鼎 冉金志 刘故箐 于 2021-06-29 设计创作，主要内容包括：本发明公开了一种用于数据中心的无线光通信收发一体化系统,包括若干个一体式光收发器,每个一体式光收发器包含一个广角GRIN/鱼眼透镜组合,一个凹透镜,一个密布的光纤组束,一个空间分束器,分别固定在MEMS设备上的一个CCD相机和一个微透镜阵列,以及一个N接口型光纤接口交叉矩阵。每个光收发器之间能够实现互相收发信息。GRIN/鱼眼透镜组合、凹透镜、空间分束器均通过空间耦合,传输光纤组束分别和N接口型光纤接口交叉矩阵、固定有微透镜阵列的MEMS设备之间采用PC连接；能够实时同步采用MEMS设备控制信号光耦合和发射,实现大范围内的无线光收发一体化。本发明具有灵活性、可扩展性强、散热好、定向传输信息的优点。(The invention discloses a wireless optical communication transceiving integrated system for a data center, which comprises a plurality of integrated optical transceivers, wherein each integrated optical transceiver comprises a wide-angle GRIN/fisheye lens combination, a concave lens, a densely distributed optical fiber group beam, a space beam splitter, a CCD camera and a micro lens array which are respectively fixed on MEMS (micro-electromechanical systems) equipment, and an N-interface type optical fiber interface cross matrix. Each optical transceiver can transmit and receive information to and from each other. The GRIN/fisheye lens combination, the concave lens and the spatial beam splitter are all coupled through space, and transmission optical fiber group beams are respectively connected with the N-interface type optical fiber interface cross matrix and the MEMS equipment fixed with the micro-lens array through PC; the MEMS device can be synchronously adopted to control the optical coupling and emission of signals in real time, and the integration of wireless optical receiving and transmitting in a large range is realized. The invention has the advantages of flexibility, strong expandability, good heat dissipation and directional information transmission.)

1. A transmit-receive integrated system for wireless optical communication of a data center, characterized in that:

comprising several integrated optical transceivers (1); each integrated optical transceiver (1) comprises a wide-angle GRIN/fisheye lens combination (3), a concave lens (2), a spatial beam splitter (5), two sets of computer-controlled MEMS (micro-electromechanical systems) devices (9), a CCD (charge coupled device) camera (6) and a micro-lens array (7) which are respectively fixed on the MEMS devices (9), one end of a densely distributed optical fiber group bundle (8) is connected with the MEMS devices fixed with the micro-lens array (7) through a PC (personal computer) end, and the other end of the densely distributed optical fiber group bundle is connected with an N-interface type optical fiber interface cross matrix (4).

2. The integrated wireless optical communication transceiver system for a data center as claimed in claim 1, wherein: the number N of the integrated optical transceivers (1) in the system is even, the optical transceivers are arranged according to a regular N-polygon, and the optical transceivers are arranged at N end points of the regular N-polygon.

3. The integrated wireless optical communication transceiver system for a data center as claimed in claim 1, wherein: the wide-angle GRIN/fisheye lens combination (3) designed by ZEMAX software can effectively receive the maximum incidence angle of a light beam of 135 degrees.

4. The integrated wireless optical communication transceiver system for a data center as claimed in claim 1, wherein: the CCD camera detection surface is compared with the receiving end plane, and the elements on the detection surface are subjected to partition summation detection according to the cross section area and the arrangement sequence of the optical fibers, so that the energy ratio coupled into the corresponding optical fibers can be monitored in real time.

5. The integrated wireless optical communication transceiver system for a data center as claimed in claim 1, wherein: the micro lens array (7) and the corresponding coupling optical fiber (8) are fixed on the MEMS device.

6. The integrated wireless optical communication transceiver system for a data center as claimed in claim 1, wherein: and the transmission optical fiber (8) is respectively connected with the N-interface type optical switching matrix (4) and the MEMS equipment (9) of the fixed micro-lens array (7) by adopting a PC end.

7. A wireless optical communication transceiving integrated communication method for a data center is characterized in that a wireless optical communication transceiving integrated system for the data center is adopted, and the method comprises the following specific steps:

step 1: performing initialization and proofreading on the device;

step 2: signal receiving and coupling adjustment;

and step 3: the signal is retransmitted;

and 4, step 4: and (5) continuing to receive and send signals subsequently, and repeating the steps according to the step 2 and the step 3.

8. The integrated wireless optical communication transceiving communication method for the data center according to claim 7, wherein: the step 1 specifically comprises the following steps:

step 1.1: determining the positions of the lens with the sequence number 1 in the micro lens array and the size of the section of the optical fiber corresponding to the sequence number 1 on the CCD camera at the monitoring end by taking a beam along the common optical axis of the micro lens array 7 under the regulation and control of the fisheye/GRIN lens combination 3, the concave lens 2, the spatial beam splitter 5 and the MEMS device 9 as the center;

step 1.2: setting initial parameters of two sets of MEMS devices 9 which simultaneously control the reflection end and the transmission end, arranging and numbering the micro-lens array and the transmission optical fiber bundle in sequence, and arranging and numbering the elements on the corresponding monitoring end CCD camera 11 according to corresponding areas.

9. The integrated wireless optical communication transceiving communication method for the data center according to claim 7, wherein: the step 2 specifically comprises the following steps:

step 2.1: any one integrated optical transceiver A in the system is used as a signal source, the angle of emergent light is adjusted, the emergent light is focused by a fisheye/GRIN lens combination 3 of another integrated optical transceiver B after being transmitted in space, and the focused emergent light is collimated by a concave lens 2 and then is divided into two beams through a space beam splitter 5;

step 2.2: the reflected light and the transmitted light respectively form light spot positions which are consistent relative to the initial center on a detection surface of the CCD camera 6 under the regulation and control of the MEMS device 9 and a plane of the micro lens array 7 under the regulation and control of the MEMS device 9;

step 2.3: the energy distribution of the reflected light on each lens on the plane of the micro lens array 7 is consistent with the energy distribution in each area of the CCD camera according to the size of the section of the optical fiber;

step 2.4: acquiring light intensity information through a cell on a CCD camera, and determining signal light with the most energy to be coupled into the area with the number of X according to the sum of the energy in each area after partitioning;

step 2.5: synchronously regulating and controlling the CCD camera and the micro-lens array to translate through the MEMS device 9, monitoring by using the CCD camera, and finishing the regulation and control of the MEMS device 9 when the signal light is coupled into the area with the number X to the maximum; at the moment, the signal light is coupled into the transmission optical fiber with the number X at the maximum efficiency; and then transmitted into the N-port fiber interface cross matrix 4.

10. The integrated wireless optical communication transceiving communication method for the data center according to claim 7, wherein: the step 3 specifically comprises the following steps:

step 3.1: after the signals are received, the signals are input into the optical fibers with the serial number Y in the transmission optical fiber bundle again through the PC by the optical cross matrix switch 4;

step 3.2: according to the principle that the optical path is reversible, the optical information is transmitted out through the micro lens array 7 and the spatial beam splitter 5, the concave lens 2 and the fish-eye/GRIN lens combination 3 again, and the optical information is received by an integrated optical transceiver C in the system to complete the information transmission again;

step 3.3: after the transmission is completed, the system will automatically return to the original parameters of the MEMS device in step 1.

Technical Field

The invention belongs to the technical field of wireless optical communication, and particularly relates to a wireless optical communication transceiving integrated system for a data center.

Background

Communication networks are an important infrastructure of data centers. The overall construction of the current communication network mainly adopts copper cables and optical fibers. Signals of different wavelengths are typically screened between different channels of a data center using wavelength division multiplexers and transmitted over optical fibers via fiber optic adapters. However, with the gradual popularization of big data and 5G applications, the following problems will be faced when wired network links are widely adopted in data centers:

(1) the nonuniformity of the transmission optical fiber easily causes the depolarization and the walk-off of the signal light, the amplitude of the signal light is attenuated by the loss in the transmission process, the detection of the effective signal by the receiving end is easily caused, and the error rate is improved.

(2) The wiring of the wired network of the data center is relatively fixed, and the expansibility and the freedom of the whole system are weakened after the connection is determined. And with the increase of data volume, the increase of transmission lines can increase the complexity and the chaos degree of the whole system link, and influence the maintenance and the heat dissipation of a subsequent system.

Disclosure of Invention

The invention aims to provide a wireless optical communication transceiving integrated system for a data center, which solves the problems of poor wired network expansion flexibility, high energy consumption and high cost in the prior art.

The technical scheme adopted by the invention is that a receiving and transmitting integrated system for wireless optical communication of a data center comprises a plurality of integrated optical transceivers; each integrated optical transceiver comprises a wide-angle GRIN/fisheye lens combination, a concave lens, a spatial beam splitter and two sets of computer-controlled MEMS (micro-electromechanical systems) equipment, wherein a CCD (charge coupled device) camera and a micro-lens array are respectively fixed on the MEMS equipment, one end of a densely distributed optical fiber group bundle is connected with the MEMS equipment fixed with the micro-lens array through a PC (personal computer) end, and the other end of the densely distributed optical fiber group bundle is connected with an N-interface type optical fiber interface cross matrix.

The number N of the integrated optical transceivers in the system is even, the integrated optical transceivers are arranged according to a regular N-polygon, and the optical transceivers are arranged at N end points of the regular N-polygon.

The wide-angle GRIN/fisheye lens combination (3) designed by ZEMAX software can effectively receive the maximum incidence angle of a light beam of 135 degrees.

The CCD camera detection surface is compared with the receiving end plane, and the elements on the detection surface are subjected to partition summation detection according to the cross section area and the arrangement sequence of the optical fibers, so that the energy ratio coupled into the corresponding optical fibers can be monitored in real time.

And the micro lens array and the corresponding coupling optical fiber are fixed on the MEMS device.

And the transmission optical fiber is respectively connected with the N-interface type optical switching matrix and the MEMS equipment for fixing the micro-lens array by adopting a PC end.

A wireless optical communication receiving and transmitting integrated communication method for a data center adopts a wireless optical communication receiving and transmitting integrated system for the data center, and comprises the following specific steps:

step 1: performing initialization and proofreading on the device;

step 2: signal receiving and coupling adjustment;

and step 3: the signal is retransmitted;

and 4, step 4: and (5) continuing to receive and send signals subsequently, and repeating the steps according to the step 2 and the step 3.

The step 1 specifically comprises the following steps:

step 1.1: determining the positions of the lens with the sequence number 1 in the micro lens array and the size of the section of the optical fiber corresponding to the sequence number 1 on the CCD camera at the monitoring end by taking a beam along the common optical axis of the micro lens array 7 under the regulation and control of the fisheye/GRIN lens combination 3, the concave lens 2, the spatial beam splitter 5 and the MEMS device 9 as the center;

step 1.2: setting initial parameters of two sets of MEMS devices 9 which simultaneously control the reflection end and the transmission end, arranging and numbering the micro-lens array and the transmission optical fiber bundle in sequence, and arranging and numbering the elements on the corresponding monitoring end CCD camera 11 according to corresponding areas.

The step 2 specifically comprises the following steps:

step 2.1: any one integrated optical transceiver A in the system is used as a signal source, the angle of emergent light is adjusted, the emergent light is focused by a fisheye/GRIN lens combination 3 of another integrated optical transceiver B after being transmitted in space, and the focused emergent light is collimated by a concave lens 2 and then is divided into two beams through a space beam splitter 5;

step 2.2: the reflected light and the transmitted light respectively form light spot positions which are consistent relative to the initial center on a detection surface of the CCD camera 6 under the regulation and control of the MEMS device 9 and a plane of the micro lens array 7 under the regulation and control of the MEMS device 9;

step 2.3: the energy distribution of the reflected light on each lens on the plane of the micro lens array 7 is consistent with the energy distribution in each area of the CCD camera according to the size of the section of the optical fiber;

step 2.4: acquiring light intensity information through a cell on a CCD camera, and determining signal light with the most energy to be coupled into the area with the number of X according to the sum of the energy in each area after partitioning;

step 2.5: synchronously regulating and controlling the CCD camera and the micro-lens array to translate through the MEMS device 9, monitoring by using the CCD camera, and finishing the regulation and control of the MEMS device 9 when the signal light is coupled into the area with the number X to the maximum; at the moment, the signal light is coupled into the transmission optical fiber with the number X at the maximum efficiency; and then transmitted into the N-port fiber interface cross matrix 4.

The step 3 specifically comprises the following steps:

step 3.1: after the signals are received, the signals are input into the optical fibers with the serial number Y in the transmission optical fiber bundle again through the PC by the optical cross matrix switch 4;

step 3.2: according to the principle that the optical path is reversible, the optical information is transmitted out through the micro lens array 7 and the spatial beam splitter 5, the concave lens 2 and the fish-eye/GRIN lens combination 3 again, and the optical information is received by an integrated optical transceiver C in the system to complete the information transmission again;

step 3.3: after the transmission is completed, the system will automatically return to the original parameters of the MEMS device in step 1.

The invention has the beneficial effects that:

(1) the fish eye/GRIN lens designed by ZEMAX is made of a material and has a mirror shape, so that light beams in a large visual angle can be received and emitted, and more optical information can be received and transmitted;

(2) the receiving and transmitting optical fiber bundles, the micro lens array and the optical fiber interface cross matrix have expansibility, and array combinations of larger optical fiber bundle bundles and more lenses can be replaced according to the requirement of information transmission quantity;

(3) the whole system realizes the receiving and transmitting integration, reduces the complexity of the system and facilitates the subsequent maintenance and heat dissipation of the communication system;

(4) the received and outgoing optical signals can be positioned in conjunction with the encoding of the receiving and transmitting fibers. Directional exchange of optical information can be achieved.

Drawings

Fig. 1 is a schematic topology structure of an integrated wireless optical communication transceiver system for a data center according to the present invention, wherein fig. 1(a), (b), and (c) are structural arrangements of transceivers when the number m of integrated transceivers in the system is m-4, 6, and 8, respectively;

fig. 2 is a specific structural diagram of a wireless optical communication transceiver integrated system for a data center when the number m of integrated transceivers is 6;

fig. 3 is a detailed block diagram of a single integrated optical transceiver in an integrated wireless optical transceiver system for a data center according to the present invention.

Fig. 4 is a diagram of arrangement and sequence numbering of optical fiber bundles of a single integrated transceiver in a wireless optical communication transceiver integrated system for a data center according to the present invention.

Fig. 5 is a schematic front view of a micro lens array under the control of a MEMS device at a transmission end of a spatial beam splitter in an integrated wireless optical communication transceiving system for a data center according to the present invention.

Fig. 6 is a schematic front view of a CCD camera under the control of a MEMS device at a reflection monitoring end of a spatial beam splitter in a wireless optical communication transceiving integrated system for a data center according to the present invention.

Fig. 7 is a cross-sectional view of a side structure of a micro-lens array under the control of MEMS devices in an integrated wireless optical communication transceiver system for a data center according to the present invention.

In the figure, 1, an integrated optical transceiver, 2, a concave lens, 3, a large-visual-angle fisheye/GRIN lens combination, 4, an N-interface type optical fiber interface cross matrix, 5, a spatial beam splitter, 6, a CCD camera controlled by an MEMS device, 7, a micro-lens array controlled by the MEMS device, 8, a transmission optical fiber beam, 9, the MEMS device, 10, a micro-lens array, 11, a focal plane of the CCD camera

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A wireless optical communication transceiving integrated system for a data center comprises a wide-angle GRIN/fisheye lens combination, a concave lens, a densely-distributed optical fiber group beam, a spatial beam splitter, a CCD camera, two sets of computer-controlled MEMS (micro-electromechanical systems) equipment, a micro-lens array fixed on one set of MEMS equipment and an N-optical fiber interface type optical cross matrix.

A geometric center common optical axis of a large-visual-angle fisheye/Grin lens combination, a concave lens and an optical fiber group bundle in a wireless optical communication transceiving integrated system for a data center is adjusted and fixed according to the relative position with the maximum coupling efficiency; the reflecting end of the spatial light splitter monitors light intensity distribution by a CCD camera fixed on the electric control MEMS device, the projecting end is coupled into N optical fiber group bundles by a micro-lens array fixed on another electric control MEMS device, and the two MEMS devices are synchronously adjusted according to the light intensity distribution result in the monitoring end to realize the maximum coupling efficiency; one end face of each optical fiber (PC interface) in the N optical fiber group bundles is positioned at the focus of the corresponding micro lens of the micro lens array; the other ends of the N optical fiber group bundles are respectively connected with N interfaces of the optical fiber interface cross matrix in a PC coupling mode.

The invention is also characterized in that:

m (even number) integrated optical transceivers in the system are arranged on a platform on the same plane and are sequentially arranged at the end positions of a regular m-edge shape.

The large-view fisheye/Grin lens combination in a single unitary transceiver can receive light beam incident angles up to 135 °.

The transmission optical fiber bundle composed of N optical fibers is densely arranged according to a regular hexagon and gradually bundled towards the outer layer, wherein the number N satisfies that N is 3N²-3n +1(n ∈ Z), the sequence number being coded in the counter-clockwise direction.

The transmission end after beam splitting by the spatial beam splitter, the micro-lens array and the receiving signal end (PC joint) of the transmission optical fiber bundle are mechanically fixed on the electric control MEMS device # 1; and N optical fibers in the transmission optical fiber bundle correspond to the N lenses on the micro lens array one by one, and the receiving end faces of the optical fibers are all positioned on the focuses of the micro lenses with corresponding numbers.

The monitoring end behind the spatial beam splitter is a CCD camera fixed on the electric control MEMS device #2, the elements on the detection plane are numbered in a partition mode according to the size of the transmission optical fiber bundle, and the relative position relation and the numbering sequence of the areas are consistent with the optical fiber number and the relative position of the transmission optical fiber bundle.

The N transmission optical fiber bundles coded in sequence are respectively connected with the N interfaces of the optical fiber interface cross matrix in a one-to-one correspondence mode through PC ends, and the N interfaces of the optical fiber interface cross matrix can be connected with each other.

As shown in fig. 1, the present invention is a topology structure diagram of a wireless optical communication integrated transceiver system for a data center. The integrated optical transceivers 1 in the system are generally grouped into an even number, and the optical transceivers are arranged at N end points of a regular N-polygon when the number N satisfies m is 4, 6, and 8.

Taking an example that the system includes 6 integrated optical transceivers (m is 6), the overall structure of the system is shown in fig. 2. Each integrated optical transceiver can receive and transmit signal light over a large viewing angle through a fisheye/GRIN lens.

As shown in fig. 3, both the received and transmitted signal lights are converted into parallel lights through the focal point of the concave lens. The space beam splitter 5 divides the received signal light into two beams, the reflected light part is received and detected by a CCD camera 6 under the control of the MEMS device 9, and the transmitted light part is coupled into a transmission optical fiber beam 8 through a micro lens array 7 under the control of the MEMS device 9. The serial number arrangement of the transmission fiber bundle 8 is shown in fig. 4, and the transmission fiber bundle 8 is butted with the N-interface fiber interface cross matrix 4 through a PC.

Fig. 5 is a schematic front view of a microlens array under the control of the signal light transmission end MEMS device 9, where the microlens array has a sequence number consistent with the number and arrangement sequence of the subsequently coupled transmission fibers. Fig. 6 is a schematic front view of a detection surface of the CCD camera under the control of the signal light reflection end MEMS device 9, and the cells in the corresponding position area on the focal plane of the CCD camera are divided and sorted by referring to the occupied area of the optical fiber and the corresponding numbering order as in fig. 5. Fig. 7 is a cross-sectional view of the side structure of the microlens array under the control of the MEMS device 9, where the receiving end surface of the transmission fiber is placed at the focus of the corresponding numbered microlens, and both are fixed in the card slot of the MEMS device 9.

The working process of the wireless optical communication link integrated transceiving system for the data center is divided into 4 steps:

(1) and (6) initializing and checking. Firstly, the position of a lens with the number 1 in the micro lens array and the position of an area (the size of the cross section of an optical fiber) corresponding to the number 1 on the CCD camera at the monitoring end are determined by taking a beam of light which is controlled by the micro lens array 7 under the control of the fisheye/GRIN lens combination 3, the concave lens 2, the spatial beam splitter 5 and the MEMS device 9 and is along the common optical axis as the center. Setting initial parameters of two sets of MEMS devices 9 for simultaneously controlling the reflection end and the transmission end, arranging and numbering the micro-lens array and the transmission fiber bundle according to the sequence of figure 4, arranging and numbering the elements on the corresponding monitoring end CCD camera 11 according to the corresponding areas, and respectively arranging the fibers and numbering the element areas as shown in figures 5 and 6.

(2) Signal reception and coupling adjustment. Optical transceiver integrated with any of the systems of fig. 2

A is used as a signal source, the angle of emergent light is adjusted, after spatial transmission, the emergent light is focused by a fish eye/GRIN lens combination 3 of another integrated optical transceiver B, and after being collimated by a concave lens 2, the emergent light is divided into two beams by a spatial beam splitter 5. The reflected light and the transmitted light form spot positions which are consistent relative to the initial center on the detection surface of the CCD camera 6 under the control of the MEMS device 9 and the plane of the micro lens array 7 under the control of the MEMS device 9 respectively. Accordingly, the energy distribution of the reflected light on each lens in the plane of the microlens array 7 at this time coincides with the energy distribution in each region in accordance with the size of the cross section of the optical fiber (microlens) on the CCD camera. Through the acquisition of the light intensity information by the elements on the CCD camera, the signal light with the maximum energy to be coupled in the area with the number X (namely, the signal light corresponding to the micro lens with the number X) can be determined according to the sum of the energies in the areas after the division. At this time, the CCD camera and the microlens array are synchronously regulated and controlled by the MEMS device 9 to perform translation, the CCD camera is used for monitoring, and when the signal light is coupled into the region with the number X to the maximum, the regulation and control of the MEMS device 9 is finished. The signal light is then coupled into the transmission fiber numbered X with maximum efficiency. And then transmitted into the N-port fiber interface cross matrix 4.

(3) And the signal is retransmitted. After the signal is received, the signal is input into the optical fiber with the serial number Y in the transmission optical fiber bundle again through the PC by the optical cross matrix switch 4. And according to the principle that the light path is reversible, the optical information is transmitted out through the micro lens array 7 and the spatial beam splitter 5, the concave lens 2 and the fish-eye/GRIN lens combination 3 again, and the optical information is received by the integrated optical transceiver C in the system to complete the information transmission again. After the transmission is completed, the system will automatically return to the initial parameters of the MEMS device in (1).

(4) And (4) continuing to receive and send signals subsequently, and repeating the steps (2) and (3).

The wireless optical communication link integrated receiving and transmitting system for the data center has the advantages that:

(1) the fish eye/GRIN lens designed by ZEMAX is made of a material and has a mirror shape, so that light beams in a large visual angle can be received and emitted, and more optical information can be received and transmitted;

(2) the receiving and transmitting optical fiber bundles, the micro lens array and the optical fiber interface cross matrix have expansibility, and array combinations of larger optical fiber bundle bundles and more lenses can be replaced according to the requirement of information transmission quantity;

(3) the whole system realizes the receiving and transmitting integration, reduces the complexity of the system and facilitates the subsequent maintenance and heat dissipation of the communication system;

(4) the received and outgoing optical signals can be positioned in conjunction with the encoding of the receiving and transmitting fibers. Directional exchange of optical information can be achieved.