CN103944641B - High-power fiber laser phased array high-speed information transmitting device capable of being dynamically connected - Google Patents

Abstract

A high-power fiber laser phased array high-speed information transmission device that can be dynamically connected is used in the field of ultra-long-distance space communication. In order to realize high-speed laser high-power emission and ultra-long-distance transmission, the seed source is split by a coupler, and a beam of light is used as a reference The light is input into the phase controller, and another beam of light is modulated at a high speed; the radio frequency signal generator and the other beam of light enter the intensity modulator to obtain a high-speed modulation signal, and the signal enters the four phase controllers after being split equally by the coupler Perform phase control to obtain four channels of high-speed modulated light, and the four channels of high-speed modulated light respectively enter four fiber amplifiers for high-power amplification, and then coherently combine beams through the beam combiner; the beam splitter outputs 1% of the combined laser beams to the phase controller In this process, the beam combining laser is compared with the reference light phase, and then the phase control signal is processed by the phase controller. After receiving the phase control signal, the four phase modulators control the phase of each light to ensure coherent beam combining and emission angle scanning.

Description

High-power fiber laser phased array high-speed information transmission device that can be dynamically connected

technical field

The invention relates to a dynamically connected high-power optical fiber laser phased array high-speed information transmitting device, which is applied to ultra-long-distance space communication fields such as deep space and interstellar space.

Background technique

A large amount of scientific data generated by space exploration needs to rely on large-capacity, ultra-long-distance space information transmission technology. The biggest feature of deep space communication is long-distance non-relay transmission, the launch power of spacecraft is limited, and the radio frequency propagation loss is proportional to the square of the distance, and the radio frequency signal also limits the transmission bandwidth of communication. Therefore, how to make up for the huge loss and realize long-distance broadband communication is the biggest problem facing deep space communication. In the field of deep space communication, laser communication can overcome the shortcomings of long transmission distance and narrow bandwidth.

At present, the laser communication system adopts a separate high-precision tracking and aiming device, and the main oscillation power amplification and transmitting system after the 1.55μm semiconductor laser seed source is passed through the erbium-doped fiber amplifier, the maximum power is only about 5W due to the limitation of the saturated output of the amplifier, thus limiting Ultra-long-distance deep space transmission. Fiber lasers have the advantages of high efficiency, good beam quality, and high output power, while fiber lasers are generated in very thin cores, which cannot withstand large average power and low single-core power.

Multi-channel optical coherent beam combining is a good solution. In theory, the intensity of the far-field center of the coherent combined beam is n times that of the incoherent combined beam (n is the number of combined beams). Fiber laser phased array technology is currently emerging fiber laser coherent combination technology, which can not only achieve high transmission power, but also scan the transmission beam, which can be used for dynamic connection of laser communication. Therefore, the application of fiber laser phased array technology to deep space high-speed information long-distance transmission has important scientific significance for the study of deep space and interstellar high-speed laser communication technology.

Contents of the invention

The object of the present invention is to propose a high-power optical fiber laser phased array high-speed information transmitting device that can be dynamically connected in order to realize high-speed laser high-power transmission and ultra-long-distance transmission.

The present invention adopts following technical scheme:

A high-power optical fiber laser phased array high-speed information transmission device that can be dynamically connected. Information modulation, the radio frequency signal generator and the other beam of light enter the intensity modulator to obtain a high-speed modulation signal, and the high-speed modulation signal enters the first phase modulator, the second phase modulator, and the third The phase modulator and the fourth phase modulator perform phase control to obtain four high-speed modulated lights, and the four high-speed modulated lights respectively enter the first optical fiber amplifier, the second optical fiber amplifier, the third optical fiber amplifier and the fourth optical fiber amplifier for high-power Amplified, and then coherently combined by the beam combiner; the beam splitter outputs a small part of the combined laser to the phase controller, and the phase of the combined laser is compared with the reference light, and then processed by the phase controller to send out a phase control signal, four After receiving the phase control signal, the phase modulator controls the phase of each light to ensure coherent beam combining and emission angle scanning.

The beneficial effects of the present invention are:

The invention can realize the dynamic output of the space carrier light source through the dynamic connection; it can realize the high-power output through multiple times of beam combining and amplification; it realizes the long-distance communication and can be applied to the ultra-long-distance deep-space high-speed information transmission.

The invention is a fiber laser phased array high-speed information transmission structure, which has simple structure, low cost, convenient operation, can realize large-angle deflection of light beam, withstand high-power light beam, low response speed, and does not have retrace phenomenon, and is suitable for deep-space laser For communication and scientific research purposes.

Description of drawings

Figure 1: A high-power fiber laser phased array high-speed information transmitting device that can be dynamically connected according to the present invention; wherein, the solid line represents an optical signal, and the dotted line represents an electrical signal.

Figure 2: The simulation diagram of the deep-space laser communication link of the dynamically connected high-power fiber laser phased array high-speed information transmitting device of the present invention at 40,000 to 350,000 kilometers.

Figure 3: Phase difference of the present invention When , the main lobe of the far-field beam deflects to the left, where a is the intensity effect diagram, and b is the intensity distribution diagram.

Figure 4: Phase difference of the present invention , the main lobe of the far-field beam is at the center of the far-field, where a is the intensity effect diagram, and b is the intensity distribution diagram.

Figure 5: Phase difference of the present invention , the main lobe of the far-field beam is deflected to the right, where a is the intensity effect diagram, and b is the intensity distribution diagram.

detailed description

The invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the high-power fiber laser phased array high-speed information transmission device that can be dynamically connected includes a seed source 1, a first coupler 2, an intensity modulator 3, a second coupler 4, and a first phase modulator 5 , the second phase modulator 6, the third phase modulator 7, the fourth phase modulator 8, the first fiber amplifier 9, the second fiber amplifier 10, the third fiber amplifier 11, the fourth fiber amplifier 12, beam combiner 13 , phase controller 14, optical splitter 15 and radio frequency signal generator 16. The output terminal of the seed source 1 is connected with the input terminal 201 of the first coupler 2, the first output terminal 202 of the first coupler 2 is connected with the port 301 of the intensity modulator 3, the second output terminal 203 of the first coupler 2 is connected with The first input port 1401 of the phase controller 14 is connected, the port 302 of the intensity modulator 3 is connected with the input port 401 of the second coupler 4, and the radio frequency signal generator 16 is connected with another port 303 of the intensity modulator 3; The first output port 402 of the coupler 4 is connected with the input port 501 of the first phase modulator 5, and the output port 502 of the first phase modulator 5 is connected with the input port of the first optical fiber amplifier 9; Two output ports 403 are connected with the input port 601 of the second phase modulator 6, and the output port 602 of the second phase modulator 6 is connected with the input port of the second optical fiber amplifier 10; The third output port 404 of the second coupler 4 is connected with The input port 701 of the third phase modulator 7 is connected, the output port 702 of the third phase modulator 7 is connected with the input port of the third optical fiber amplifier 11; the fourth output port 405 of the second coupler 4 is connected with the fourth phase modulator The input port 801 of 8 is connected, and the output port 802 of the fourth phase modulator 8 is connected with the input port of the fourth optical fiber amplifier 12; The output port of the first optical fiber amplifier 9 is connected with the first input port 1301 of the beam combiner 13, the second The output ports of the two optical fiber amplifiers 10 are connected with the second input port 1302 of the beam combiner 13, the output ports of the third optical fiber amplifier 11 are connected with the third input port 1303 of the beam combiner 13, and the output ports of the fourth optical fiber amplifier 12 are connected with the third input port 1303 of the beam combiner 13. The fourth input port 1304 of the beam combiner 13 is connected; the output port 1305 of the beam combiner 13 is connected to the input port 1501 of the optical splitter 15, and the first output port 1502 of the optical splitter 15 is connected to the second input port 1402 of the phase controller 14 Connection, the port 1403 output signal of the phase controller 14 is respectively connected with the port 503 of the first phase modulator 5, the port 603 of the second phase modulator 6, the port 703 of the third phase modulator 7 and the port of the fourth phase modulator 8 Port 803 is connected; the second port 1503 of the optical splitter 15 is output.

Preferably, the seed source 1 uses a 1.06 μm single longitudinal mode narrow-linewidth laser seed source to output through a high-power ytterbium-doped fiber amplifier, and adopts a polarization-maintaining fiber output to maintain the linear polarization of the laser and a stable single longitudinal mode.

Preferably, all four phase modulators use waveguide fiber input/output phase modulators for phase control.

Preferably, the beam combiner 13 uses a fiber optic V-groove laser beam combiner for beam combining.

A high-power fiber laser phased array high-speed information transmitting device that can be dynamically connected. The seed source 1 is split by the first coupler 2, and one beam of light is used as a reference light. After the reference light is split, high-speed information modulation is performed. The 10Gbps radio frequency signal 16 and Another beam of light enters the intensity modulator 3 to obtain a high-speed modulation signal, and the high-speed modulation signal enters the first phase modulator 5, the second phase modulator 6, the third phase modulator 7, and the The four-phase modulator 8 performs phase control to obtain four high-speed modulated lights, and the four high-speed modulated lights respectively enter the first optical fiber amplifier 9, the second optical fiber amplifier 10, the third optical fiber amplifier 11, and the fourth optical fiber amplifier 12 for high-power Amplified, and then coherently combined by the beam combiner 13. The light beam passes through the above-mentioned phase modulator and then is amplified by a high-power optical fiber amplifier, and the power will reach about 10W. Then, the same-source lasers are coherently combined through the beam combiner 13, and after passing through the beam combiner 13, the coherent combination of four 10W laser beams can reach 28W. The beam splitter 15 compares the phases of the 1% beam combining laser with the reference laser, and then processes and sends a phase control signal through the phase control circuit 14 according to the phase deviation between the two, and controls the phase of each beam through the phase modulator to ensure coherent beam combining and Launch angle scan.

Fig. 2 is the 40,000 to 350,000 km deep-space laser communication link simulation diagram of the device of the present invention, as can be seen, when the communication distance is 350,000 km, its safety margin is 7.26 dB, which has a large space to reduce the communication receiving device sensitivity.

Fig. 3 to Fig. 5 are the far-field intensity distribution diagrams of the device of the present invention when the communication distance is 40 kilometers, respectively adjusting the phase of the laser beam in each phase shifter can control the wavefront of the beam and realize the beam deflection. Figure 3 shows the phase difference , the main lobe of the far-field beam deflects to the left. Figure 4 shows the phase difference , the main lobe is at the center of the far field. Figure 5 is the phase difference , the main lobe is deflected to the right. At this time, in the -π/2 and π/2 regions, the fiber laser phased array can perform dynamic scanning and realize dynamic connection. At this time, in the laser communication system based on the fiber laser phased array source, each laser communication terminal is used as a node, and the beam deflection area between each node is a dynamic connection area. In this area, fiber laser can be relied on Phased arrays enable dynamic communication.

Claims (4)

1. can Dynamic link library high power optical fibre laser phased array high speed information discharger, it is characterized in that, seed source (1) is through One bonder (2) light splitting, wherein light beam, as reference light, is input in phase controller (14), and another light beam is carried out at a high speed Modulates information, radio-frequency signal generator (16) enters intensity modulator (3) with described another light beam and obtains high speed modulated signal, high Rate modulation signal respectively enters first phase manipulator (5), second phase manipulator after the average light splitting of the second bonder (4) (6), third phase manipulator (7) and the 4th phase-modulator (8) carry out phase controlling and obtain four road high speed amplitude modulated beams, and described four Road high speed amplitude modulated beams respectively enter the first fiber amplifier (9), the second fiber amplifier (10), the 3rd fiber amplifier (11) and 4th fiber amplifier (12) carries out high power amplification, then through bundling device (13) coherently combined；Beam splitter (15) closes bundle by 1% Laser exports to phase controller (14), and this conjunction Shu Jiguang compares with reference to light phase, then passes through phase controller (14) place Get a haircut out phase control signal, four phase-modulators control the phase place of every road light it is ensured that phase after receiving phase control signal Dry conjunction is restrainted and transmitting angle sweep.

2. as claimed in claim 1 can Dynamic link library high power optical fibre laser phased array high speed information discharger, it is special Levying is, described seed source (1) adopts 1.06 μm of single longitudinal mode narrow linewidth laser seed sources through high power ytterbium doped optical fiber amplifier Output, adopts polarization maintaining optical fibre to export to keep laser linear polarization and stable single longitudinal mode.

3. as claimed in claim 1 can Dynamic link library high power optical fibre laser phased array high speed information discharger, it is special Levying is, described first phase manipulator (5), second phase manipulator (6), third phase manipulator (7), the 4th phase-modulation Device (8) carries out phase controlling using the phase-modulator of waveguide type optical fiber input/output.

4. as claimed in claim 1 can Dynamic link library high power optical fibre laser phased array high speed information discharger, it is special Levying is, described bundling device (13) carries out closing bundle using optical fiber V-shaped groove laser bundling device part.