CN113037373B

CN113037373B - Large-area APD space laser regeneration device

Info

Publication number: CN113037373B
Application number: CN201911352981.5A
Authority: CN
Inventors: 张阳; 张文远; 代永红; 梁赫西
Original assignee: Shenzhen Zhaohua Intelligent Co ltd
Current assignee: Shenzhen Zhaohua Intelligent Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2022-07-29
Anticipated expiration: 2039-12-25
Also published as: CN113037373A

Abstract

The invention relates to a large-area APD space laser regeneration device, which comprises a circular body, wherein a power module and a circuit board are arranged on the circular body, the circuit board comprises an optical input unit, a monitoring unit and a main control MCU unit, wherein the optical input unit comprises an APD module, a DC _ DC boosting module and an amplitude limiting amplification module; the optical output unit comprises a switch selection module, a laser modulation module, an alternative receiving and transmitting module and an optical fiber output port, and the electrical signal output by the amplitude limiting amplification module outputs a regenerated optical signal through the laser modulation module and the optical fiber output port. The large-area APD module is adopted, the photoelectric detection sensitivity is improved, meanwhile, the output of the space laser regenerator comprises two output modes, the amplified electric signal can be modulated by the modulator to generate laser with stable optical power, the laser is output through the optical fiber, and the corresponding laser can be emitted through the optical transceiver module to realize the regeneration of the laser.

Description

Large-area APD space laser regeneration device

Technical Field

The invention relates to the field of wireless laser communication, in particular to a large-area APD space laser regeneration device.

Background

At present, the high-speed laser communication mostly adopts an optical fiber coupling mode for wire communication, for wireless laser communication, laser emitted by a laser tube is coupled to a transmitting antenna after passing through an EDFA and a collimator, and the wireless laser is transmitted to a space, and when the laser is transmitted through an atmospheric channel, the laser is inevitably influenced by atmospheric turbulence, a series of atmospheric turbulence effects such as light intensity flicker, arrival angle fluctuation, beam drift and the like of laser beams are caused, so that light spot jitter of a receiving end, phase distortion and received light power fluctuation are caused, the communication error rate is increased, communication interruption can be caused under serious conditions, and the reliability of a communication system is influenced.

Disclosure of Invention

The invention aims to provide a large-area APD space laser regeneration device, and aims to solve the problems of low coupling efficiency, low sensitivity and high communication error rate caused by the fact that the area of a photosensitive surface of a detector in space laser communication is too small.

The technical scheme adopted by the invention for solving the technical problems is as follows: provides a large-area APD space laser regeneration device, which comprises a circular body, wherein a power supply module and a circuit board are arranged on the circular body, the circuit board comprises an optical input unit, a monitoring unit and a main control MCU unit, wherein,

The optical input unit comprises an APD module, a DC _ DC boosting module and an amplitude limiting amplification module; the APD module is respectively connected with the DC _ DC boosting module and the amplitude limiting amplification module, the DC _ DC boosting module provides high-voltage bias for the APD module, signal light directly irradiates the APD module through the spatial light coupling collimation input interface, and is output to the switch selection module after being amplified by the amplitude limiting amplification module;

the optical output unit comprises a switch selection module, a laser modulation module, an alternative transceiver module and an optical fiber output port, the amplitude limiting amplification module is respectively connected with the laser modulation module and the alternative transceiver module through the switch selection module, and an electric signal output by the amplitude limiting amplification module outputs a regenerated optical signal through the laser modulation module and the optical fiber output port; or the backup function of the output of the regenerated optical signal is realized through the alternative receiving and sending module and the optical fiber output port;

the monitoring unit comprises a power monitoring module and a current monitoring module; the current monitoring module is connected with the MCU module and the laser modulation module, and the power monitoring module is connected with the APD module;

the main control MCU unit comprises an MCU module and a communication interface module, wherein the MCU module is used for collecting data and transmitting communication data with an upper computer through the communication interface module.

Further preferred embodiments of the present invention are: the APD module is packaged in the center of the back face of the circuit board and used for receiving optical coupling of the laser beams, and a front-mounted transimpedance amplifier is further arranged on the circuit board and connected with the APD module and used for converting electric signals into voltage signals so as to amplify the electric signals.

Further preferred embodiments of the present invention are: the diameter of a photosensitive detection surface of the APD module is larger than or equal to 100 mu m.

Further preferred embodiments of the present invention are: the power module comprises a power supply module and a power input port, the surface of the circular body is uniformly inlaid with three positioning holes, the circular body is further connected with an extension belt, the optical fiber output port is arranged on an interface end face of the extension belt, and the power input port is arranged at a side end of the extension belt.

Further preferred embodiments of the present invention are: and a monitoring indicator lamp is arranged on the extension belt.

The invention has the advantages that the large-area APD module is adopted, the problem of sensitivity reduction caused by facula jitter is effectively solved, the photoelectric detection sensitivity is improved, meanwhile, the output of the spatial laser regenerator comprises two output modes, and the spatial laser regenerator not only can generate laser with stable optical power after modulating the amplified electric signal through the modulator, but also can emit corresponding laser through the optical transceiver module to realize the regeneration of the laser.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of the internal functions of a large-area APD space laser regeneration device according to the present invention;

FIG. 2 is a schematic plan view of a large area APD space laser regeneration apparatus of the present invention;

FIG. 3 is a schematic diagram of the use of the large area APD space laser regeneration apparatus of the present invention.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1-3, the present invention provides a large-area APD space laser regeneration device, which includes a circular body 10, wherein the circular body 10 is provided with a power module and a circuit board, and the circuit board includes an optical input unit, a monitoring unit and a main control MCU unit.

The optical input unit comprises an APD module 29, a DC _ DC boost module 28 and an amplitude limiting and amplifying module 33; the APD module 29 is connected to the DC _ DC boost module 28 and the amplitude limiting amplification module 33, respectively, and the DC _ DC boost module 28 provides a high voltage bias to the APD module 29. The signal light directly irradiates to the APD module 29 through the spatial light coupling collimation input interface, and is output to the switch selection module 34 after being amplified by the amplitude limiting amplification module 33.

Specifically, the DC _ DC boost module 28 is connected to the power input port 31 of the power module, and is configured to boost the 5V DC power to 43V for supplying power to the APD module 29. The APD module 29 is a large-area APD avalanche photodiode, is used for receiving laser spots, has a large photosensitive surface area, has a diameter larger than or equal to 100 micrometers, can still be accurately received when the spots become large or are disturbed, and can realize detection with higher sensitivity when optical signals are converted into electric signals; the APD module 29 and the amplitude limiting amplification module 33 form a low noise amplifier with strong interference resistance, and convert the low noise amplifier into a stable LVDS signal for output. APD module 29, when realizing space laser communication below 622Mbps, survey the face diameter and be not less than 400um, when realizing space laser communication below 5Gbps, survey the face diameter and be not less than 100 um.

The optical output unit comprises a switch selection module 34, a laser modulation module 39, an alternative transceiver module 35 and an optical fiber output port 40, the amplitude limiting amplification module 33 is respectively connected with the laser modulation module 39 and the alternative transceiver module 35 through the switch selection module 34, and an electric signal output by the amplitude limiting amplification module 33 outputs a regenerated optical signal through the laser modulation module 39 and the optical fiber output port 40; or the backup function of the output of the regenerated optical signal is realized through the alternative transceiver module 35 and the optical fiber output port 40.

Specifically, the switch selection module 34 is a dual-control switch, and in a normal working state, the electrical signal output by the amplitude limiting amplification module 33 outputs a regenerated optical signal through the laser modulation module 39 and the optical fiber output port 40; when the laser modulation module 39 is abnormal, the switch selection module 34 automatically switches the output mode, and the function of outputting and backing up the regenerated optical signal is realized through the alternative transceiver module 35 and the optical fiber output port 40. The output of the large-area APD space laser regeneration device comprises two output modes, and the large-area APD space laser regeneration device not only can generate laser with stable optical power after modulating the amplified electric signal through the laser modulation module 39 and output the laser through the optical fiber, but also can emit corresponding laser through the optical transceiver module to realize the regeneration of the laser; the difficulty of space laser receiving is further reduced.

The monitoring unit comprises a power monitoring module 36 and a current monitoring module 38; the current monitoring module 38 is connected with the MCU module 37 and the laser modulation module 39, and the power monitoring module 36 is connected with the APD module 29; the main control MCU unit comprises an MCU module 37 and a communication interface module 41, and the MCU module 37 transmits communication data with the upper computer through the communication interface module 41. The MCU module 37 includes a plurality of analog/digital converters therein, and implements data acquisition functions such as reading of operating status, power acquisition, power presetting, bias current setting, and the like, and completes current acquisition of the APD module 29 and the laser modulation module 39. The power monitoring module 36 calculates the magnitude of the input optical power through numerical calculation according to the magnitude of the photo-generated current collected by the multi-channel analog/digital converter, so as to realize real-time power monitoring. The current monitoring module 38 monitors the laser output power through data analysis according to the current of the laser modulation module 39 collected by the multi-channel analog/digital converter. The user upper computer communicates with the MCU module 37 through the communication interface module 41, and the communication interface module 41 of this embodiment is an RS232 serial port.

Referring to fig. 2 and 3, the large-area APD space laser regeneration apparatus of the present invention is disposed on the optical path of the laser beam and connected to the optical collimator 14 on the optical path. The laser signal passing through optical collimator 14 is optically coupled to the photosensitive surface of APD module 29 of the device through a spatial optical coupling collimation input interface.

The device includes circular body 10 and connects extension area 12 on circular body 10, power module includes power supply module 30 and power input port 31, circular body 10 surface is evenly inlayed and is had three locating hole 11, through the three accurate locating hole 11 that becomes 120 degrees, fixes APD module 29 in the center of circuit board, only needs to adjust the focus of optical collimator 14, can conveniently realize the optical signal coupling of space laser beam to APD module 29, reduces the degree of difficulty of optical adjustment.

The fiber output port 40 of the embodiment is arranged at the side end of the extension strip 12, the power input port 31 is arranged at the top end of the extension strip 12, and the monitoring indicator 13 is arranged on the extension strip 12. Two fiber output ports 40 are located at the side ends of the extension band 12 for connection to an optical transceiver. The monitoring indicator light 13 shows the working state of the device, and is positioned at the top of the ribbon interface with the power input port 31; lead wire connection of the electrical signal interface is facilitated.

The APD module 29 of this embodiment is packaged in a flat window TO package in the center of the back of a circuit board, the circuit board is further provided with a pre-transimpedance amplifier, the pre-transimpedance amplifier is connected TO the APD module 29, the pre-photoelectric transimpedance amplifier uses a single power supply, a high-performance and low-noise amplifier is selected TO implement circuit matching, and a flat window TO package is used on an optical path TO convert an optical signal into a photo-generated current, which is further converted into a voltage signal, so as TO implement amplification of an electrical signal greater than 60dB Ω.

In this embodiment, the current monitoring module 38 adopts DS1858E of MAXIM, the MCU module 37 adopts C8051f852 of silab, the amplitude limiting and amplifying module 33 adopts max3748 of MAXIM, and the laser modulation module 39 adopts max3735 of MAXIM.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

Claims

1. A large-area APD space laser regeneration device is characterized by comprising a circular body, wherein a power supply module and a circuit board are arranged on the circular body, the circuit board comprises an optical input unit, an optical output unit, a monitoring unit and a main control MCU unit, wherein,

2. The large area APD space laser regeneration device according to claim 1, wherein the APD module is packaged in the center of the back surface of the circuit board for receiving the optical coupling of the laser beam, the circuit board is further provided with a pre-transimpedance amplifier, and the pre-transimpedance amplifier is connected with the APD module for converting the electrical signal into a voltage signal to amplify the electrical signal.

3. The large area APD space laser regeneration device of claim 2 in which the APD module photosensitive detection facet diameter is 100 μm or greater.

4. The large area APD space laser regeneration device of claim 3, wherein the power module includes a power supply module and a power input port, the circular body has three positioning holes uniformly embedded on the surface thereof, the circular body is further connected with an extension band, the optical fiber output port is disposed on the interface end face of the extension band, and the power input port is disposed on the side end of the extension band.

5. The large area APD space laser regeneration device according to claim 4, wherein a monitoring indicator light is disposed on the extension strip.