CN107682044B - Laser and Microwave Hybrid Delivery System - Google Patents
Laser and Microwave Hybrid Delivery System Download PDFInfo
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Abstract
激光和微波混合传输系统,属于通信技术领域,针对现有技术的不足,第一可调谐半导体激光器与第二3dB耦合器d端口相连,第二3dB耦合器f端口与第一光电探测器、高通滤波器、第二微波放大器和微波发射天线依次相连;任意波形发生器、第一微波放大器、强度调制器依次相连;第二可调谐半导体激光器与强度调制器相连,强度调制器与第一3dB耦合器a端口相连;第一3dB耦合器b端口与第二3dB耦合器e端口相连;第一3dB耦合器c端口与光放大器和激光发射天线依次相连;微波发射天线与微波接收天线相对应收发信号,微波接收天线和检波器相连;激光发射天线与光接收天线相对应收发信号,光接收天线和第二光电探测器相连。
The laser and microwave hybrid transmission system belongs to the field of communication technology. In view of the deficiencies in the prior art, the first tunable semiconductor laser is connected to the d port of the second 3dB coupler, and the f port of the second 3dB coupler is connected to the first photodetector, Qualcomm The filter, the second microwave amplifier and the microwave transmitting antenna are connected in sequence; the arbitrary waveform generator, the first microwave amplifier, and the intensity modulator are connected in sequence; the second tunable semiconductor laser is connected to the intensity modulator, and the intensity modulator is coupled to the first 3dB connected to the a port of the first 3dB coupler; the b port of the first 3dB coupler is connected to the e port of the second 3dB coupler; the c port of the first 3dB coupler is connected to the optical amplifier and the laser transmitting antenna in turn; the microwave transmitting antenna and the microwave receiving antenna correspond to send and receive signals , the microwave receiving antenna is connected to the wave detector; the laser transmitting antenna and the light receiving antenna correspond to send and receive signals, and the light receiving antenna is connected to the second photodetector.
Description
技术领域technical field
本发明涉及一种激光和微波混合传输系统,属于通信技术领域;本发明可以应用于物联网、移动通信、卫星通信等诸多领域。The invention relates to a laser and microwave hybrid transmission system, belonging to the technical field of communication; the invention can be applied to many fields such as the Internet of Things, mobile communication, and satellite communication.
背景技术Background technique
为了满足未来的卫星通信系统,发展激光和微波混合传输是十分必要的。在空间通信系统中,卫星与卫星之间的信道几乎是真空的,可充分利用激光实现数千甚至数万公里的通信距离。而卫星和地面之间,激光通信的信道经过大气层,大气层的气候变化以及存在的大气湍流会对光产生吸收和散射,导致光的强度、频率、相位和偏振等状态发生随机变化。这些变化会使基于激光通信系统的信号的捕获、跟踪变得异常困难,甚至会使通信系统失效。而微波通信的性能受湍流的影响相对较小,为了有效的保障卫星与卫星之间以及卫星与地面之间的高效、持续的通信。借助激光通信和微波通信的天然互补性,未来的卫星通信系统应能充分联合微波和激光通信技术的特点,采用激光和微波共存、混合的传输模式。激光和微波混合通信系统作为一种能够有效解决无线通信过程中因恶劣天气而产生的系统误码率上升、可用性降低等问题的解决方案。两种通信方式相互补充,可以根据对接收端接收误码率大小或信噪比值大小来选择通信链路,通过这种方式可以使通信系统在面临恶劣天气时仍然具有较高可用性与可靠性。激光通信可提供高速率的通信服务,而微波通信提供的通信速率相对较低。因此,在实际使用过程中可采用激光通信链路作为主通信链路,而微波通信链路作为激光通信链路的备份链路,在主通信链路无法保证基本需求或通信中断时启用备份链路。从而保证通信链路的可靠性。激光和微波混合通信系统在国内外已越来越受到重视,该系统满足了用户对无线通信系统高速、安全、稳定、可靠的要求,在物联网、移动通信、卫星通信等诸多领域具有巨大的应用前景。In order to meet the future satellite communication system, it is very necessary to develop laser and microwave hybrid transmission. In the space communication system, the channel between satellites is almost a vacuum, and lasers can be fully utilized to achieve communication distances of thousands or even tens of thousands of kilometers. Between the satellite and the ground, the laser communication channel passes through the atmosphere, and the climate change in the atmosphere and the existing atmospheric turbulence will absorb and scatter the light, resulting in random changes in the intensity, frequency, phase and polarization of the light. These changes will make it extremely difficult to capture and track signals based on laser communication systems, and even make the communication systems invalid. The performance of microwave communication is relatively less affected by turbulence, in order to effectively ensure efficient and continuous communication between satellites and between satellites and the ground. With the help of the natural complementarity of laser communication and microwave communication, the future satellite communication system should be able to fully combine the characteristics of microwave and laser communication technology, and adopt the coexistence and mixed transmission mode of laser and microwave. The laser and microwave hybrid communication system is a solution that can effectively solve the problems of system bit error rate increase and availability reduction caused by bad weather in the wireless communication process. The two communication methods complement each other, and the communication link can be selected according to the size of the bit error rate or signal-to-noise ratio at the receiving end. In this way, the communication system can still have high availability and reliability in the face of severe weather. . Laser communication can provide high-speed communication services, while microwave communication provides relatively low communication rates. Therefore, in actual use, the laser communication link can be used as the main communication link, and the microwave communication link can be used as the backup link of the laser communication link. When the main communication link cannot guarantee the basic needs or the communication is interrupted, the backup link can be used. road. Thereby ensuring the reliability of the communication link. The laser and microwave hybrid communication system has been paid more and more attention at home and abroad. This system meets the user's requirements for high-speed, safe, stable and reliable wireless communication systems. It has huge potential in many fields such as the Internet of Things, mobile communications, and satellite communications. Application prospects.
发明内容Contents of the invention
本发明针对现有的激光和微波混合传输系统需分别基于激光通信系统和微波通信系统才能进行信息收发的不足,本发明提供了一种基于两个可调谐半导体激光器实现激光和微波的混合传输。The present invention aims at the deficiency that the existing laser and microwave hybrid transmission system needs to be based on the laser communication system and the microwave communication system respectively to send and receive information. The present invention provides a hybrid transmission of laser and microwave based on two tunable semiconductor lasers.
本发明采用如下技术方案:The present invention adopts following technical scheme:
激光和微波混合传输系统,其特征是,其包括第一可调谐半导体激光器、第二可调谐半导体激光器、任意波形发生器、第一微波放大器、强度调制器、第一3dB耦合器、第二3dB耦合器、第一光电探测器、光放大器、高通滤波器、激光发射天线、第二微波放大器、微波发射天线、微波接收天线、光接收天线、检波器和第二光电探测器;第一可调谐半导体激光器与第二3dB耦合器的d端口相连,第二3dB耦合器的f端口与第一光电探测器、高通滤波器、第二微波放大器和微波发射天线依次相连;任意波形发生器、第一微波放大器、强度调制器依次相连;第二可调谐半导体激光器与强度调制器相连,强度调制器与第一3dB耦合器的a端口相连;第一3dB耦合器的b端口与第二3dB耦合器的e端口相连;第一3dB耦合器的c端口与光放大器和激光发射天线依次相连;微波发射天线与微波接收天线相对应收发信号,微波接收天线和检波器相连,示波器与检波器相连,用于观测;激光发射天线与光接收天线相对应收发信号,光接收天线和第二光电探测器相连,第二示波器与第二光电探测器相连,用于观测。The laser and microwave hybrid transmission system is characterized in that it includes a first tunable semiconductor laser, a second tunable semiconductor laser, an arbitrary waveform generator, a first microwave amplifier, an intensity modulator, a first 3dB coupler, a second 3dB Coupler, first photodetector, optical amplifier, high-pass filter, laser transmitting antenna, second microwave amplifier, microwave transmitting antenna, microwave receiving antenna, light receiving antenna, wave detector and second photodetector; first tunable The semiconductor laser is connected to the d port of the second 3dB coupler, and the f port of the second 3dB coupler is connected to the first photodetector, the high-pass filter, the second microwave amplifier and the microwave transmitting antenna in sequence; the arbitrary waveform generator, the first The microwave amplifier and the intensity modulator are connected in sequence; the second tunable semiconductor laser is connected to the intensity modulator, and the intensity modulator is connected to the a port of the first 3dB coupler; the b port of the first 3dB coupler is connected to the second 3dB coupler The e port is connected; the c port of the first 3dB coupler is connected with the optical amplifier and the laser transmitting antenna in turn; the microwave transmitting antenna and the microwave receiving antenna correspond to send and receive signals, the microwave receiving antenna is connected with the detector, and the oscilloscope is connected with the detector for Observation: The laser transmitting antenna and the light receiving antenna correspond to send and receive signals, the light receiving antenna is connected to the second photodetector, and the second oscilloscope is connected to the second photodetector for observation.
本发明的有益效果是:该系统基于两个可调谐半导体激光器实现激光和微波的混合传输,它能在同一系统中实现激光信号和微波信号的同时发射。通过这种方式解决了通信系统在面临恶劣天气时通信中断的可能性,增加了通信系统的可靠性。基于激光信号和微波信号的混合传输可增加系统可靠性的优势,本发明激光和微波混合传输系统在物联网、移动通信、卫星通信等诸多领域具有广泛的应用前景。The beneficial effect of the invention is that the system realizes the mixed transmission of laser and microwave based on two tunable semiconductor lasers, and can realize the simultaneous emission of laser signal and microwave signal in the same system. In this way, the possibility of communication interruption when the communication system is faced with bad weather is solved, and the reliability of the communication system is increased. Based on the advantage that the hybrid transmission of laser signals and microwave signals can increase system reliability, the laser and microwave hybrid transmission system of the present invention has broad application prospects in many fields such as the Internet of Things, mobile communications, and satellite communications.
此外,本发明结构简单,其损耗低、性能稳定、易于与光纤系统集成。In addition, the invention has simple structure, low loss, stable performance and easy integration with optical fiber system.
附图说明Description of drawings
图1为激光和微波混合传输系统结构示意图。Figure 1 is a schematic diagram of the laser and microwave hybrid transmission system.
图2为激光信号作为载波时解调出10Gbps的伪随机数字信号眼图。Figure 2 is the eye diagram of the 10Gbps pseudo-random digital signal demodulated when the laser signal is used as the carrier.
图3为激光信号作为载波时解调出10Gbps的正弦模拟信号波形图。Figure 3 is a waveform diagram of a 10Gbps sinusoidal analog signal demodulated when the laser signal is used as a carrier.
图4为微波信号作为载波时解调出200Mbps的伪随机数字信号眼图。Figure 4 is an eye diagram of a 200Mbps pseudo-random digital signal demodulated when a microwave signal is used as a carrier.
图5为微波信号作为载波时解调出800Mbps的正弦模拟信号波形图。Fig. 5 is a waveform diagram of a sine analog signal of 800 Mbps demodulated when a microwave signal is used as a carrier.
具体实施方式Detailed ways
下面结合附图对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings.
参见图1,激光和微波混合传输系统,其包括第一可调谐半导体激光器1、第二可调谐半导体激光器2、任意波形发生器3、第一微波放大器4、强度调制器5、第一3dB耦合器6、第二3dB耦合器7、第一光电探测器8、光放大器9、高通滤波器10、激光发射天线11、第二微波放大器12、微波发射天线13、微波接收天线14、光接收天线15、检波器16和第二光电探测器17。第一可调谐半导体激光器1与第二3dB耦合器7的d端口相连,第二3dB耦合器7的f端口与第一光电探测器8、高通滤波器10、第二微波放大器12和微波发射天线13依次相连。任意波形发生器3、第一微波放大器4、强度调制器5依次相连。第二可调谐半导体激光器2与强度调制器5相连,强度调制器5与第一3dB耦合器6的a端口相连。第一3dB耦合器6的b端口与第二3dB耦合器7的e端口相连。第一3dB耦合器6的c端口与光放大器9和激光发射天线11依次相连。微波发射天线13与微波接收天线14相对应收发信号,微波接收天线14和检波器16相连,示波器18与检波器16相连,用于观测。激光发射天线11与光接收天线15相对应收发信号,光接收天线15和第二光电探测器17相连,第二示波器19与第二光电探测器17相连,用于观测。Referring to Fig. 1, the laser and microwave hybrid transmission system includes a first tunable semiconductor laser 1, a second tunable semiconductor laser 2, an arbitrary waveform generator 3, a first microwave amplifier 4, an intensity modulator 5, and a first 3dB coupling Device 6, second 3dB coupler 7, first photodetector 8, optical amplifier 9, high-pass filter 10, laser transmitting antenna 11, second microwave amplifier 12, microwave transmitting antenna 13, microwave receiving antenna 14, optical receiving antenna 15. A detector 16 and a second photodetector 17. The first tunable semiconductor laser 1 is connected with the d port of the second 3dB coupler 7, and the f port of the second 3dB coupler 7 is connected with the first photodetector 8, the high-pass filter 10, the second microwave amplifier 12 and the microwave transmitting antenna 13 are connected successively. The arbitrary waveform generator 3, the first microwave amplifier 4, and the intensity modulator 5 are connected in sequence. The second tunable semiconductor laser 2 is connected to the intensity modulator 5 , and the intensity modulator 5 is connected to the a port of the first 3dB coupler 6 . The b port of the first 3dB coupler 6 is connected to the e port of the second 3dB coupler 7 . The c-port of the first 3dB coupler 6 is connected with the optical amplifier 9 and the laser transmitting antenna 11 in sequence. The microwave transmitting antenna 13 is corresponding to the microwave receiving antenna 14 to send and receive signals, the microwave receiving antenna 14 is connected to the detector 16, and the oscilloscope 18 is connected to the detector 16 for observation. The laser transmitting antenna 11 and the light receiving antenna 15 correspond to send and receive signals, the light receiving antenna 15 is connected to the second photodetector 17, and the second oscilloscope 19 is connected to the second photodetector 17 for observation.
第一可调谐半导体激光器1的发射波长和第二可调谐半导体激光器2的发射波长具有波长差。The emission wavelength of the first tunable semiconductor laser 1 and the emission wavelength of the second tunable semiconductor laser 2 have a wavelength difference.
任意波形发生器3用于产生不同速率的伪随机数字信号和正弦模拟信号脉冲波形。Arbitrary waveform generator 3 is used to generate pseudo-random digital signals and sinusoidal analog signal pulse waveforms of different rates.
高通滤波器10用于滤除低频分量。The high pass filter 10 is used to filter out low frequency components.
调节第一可调谐半导体激光器1的发射波长为1550nm,调节第二可调谐半导体激光器2的发射波长为1550.08nm。任意波形发生器3发出信号经过第一微波放大器4放大后进去强度调制器5,第二可调谐半导体激光器2发出的激光经过强度调制器5后变成带有加载调制信息的激光信号,带有加载调制信息的激光信号进入第一3dB耦合器6的a端口,50%带有加载调制信息的激光信号从第一3dB耦合器6的c端口输出进入光放大器9放大后由激光发射天线11发射。The emission wavelength of the first tunable semiconductor laser 1 is adjusted to 1550 nm, and the emission wavelength of the second tunable semiconductor laser 2 is adjusted to 1550.08 nm. The signal sent by the arbitrary waveform generator 3 is amplified by the first microwave amplifier 4 and then enters the intensity modulator 5, and the laser light emitted by the second tunable semiconductor laser 2 passes through the intensity modulator 5 and becomes a laser signal with loaded modulation information, with The laser signal loaded with modulation information enters the a port of the first 3dB coupler 6, and 50% of the laser signal with the loaded modulation information is output from the c port of the first 3dB coupler 6 and enters the optical amplifier 9 to be amplified and then emitted by the laser transmitting antenna 11 .
另外的50%带有加载调制信息的激光信号从第一3dB耦合器6的b端口输出进入第二3dB耦合器7的e端口,第一可调谐半导体激光器1发出的激光信号从第二3dB耦合器7的d端口进入,两束激光信号在第二3dB耦合器7中耦合共同进入第一光电探测器8产生带有加载调制信息的高频微波信号,带有加载调制信息的高频微波信号经过高通滤波器10滤除低频分量后经过第二微波放大器12放大后通过微波发射天线13发射。Another 50% of the laser signal with loaded modulation information is output from the b port of the first 3dB coupler 6 into the e port of the second 3dB coupler 7, and the laser signal sent by the first tunable semiconductor laser 1 is coupled from the second 3dB coupler The d port of the detector 7 enters, and the two beams of laser signals are coupled in the second 3dB coupler 7 and enter the first photodetector 8 to generate a high-frequency microwave signal with loaded modulation information, and a high-frequency microwave signal with loaded modulated information The low-frequency components are filtered out by the high-pass filter 10, amplified by the second microwave amplifier 12, and then transmitted by the microwave transmitting antenna 13.
微波发射天线13发射的加载调制信息的高频微波信号由微波接收天线14接收,该信号通过检波器16解调后进入第一示波器18用于观测。激光发射天线11发射的带有加载信息的激光信号由光接收天线15接收,该信号通过第二光电探测器17解调后进入第二示波器19用于观测。The high-frequency microwave signal loaded with modulation information transmitted by the microwave transmitting antenna 13 is received by the microwave receiving antenna 14 , and the signal is demodulated by the detector 16 and enters the first oscilloscope 18 for observation. The laser signal with loaded information emitted by the laser transmitting antenna 11 is received by the light receiving antenna 15, and the signal is demodulated by the second photodetector 17 and enters the second oscilloscope 19 for observation.
本发明是一种基于两个可调谐半导体激光器实现激光和微波的混合传输,当采用激光信号作为载波时,可传输10Gbps的伪随机数字信号和10Gbps的正弦模拟信号,解调出10Gbps的伪随机数字信号眼图,如图2所示,该系统传输的10Gbps伪随机数字信号的误码率为0。The present invention is based on two tunable semiconductor lasers to realize the mixed transmission of laser and microwave. When the laser signal is used as the carrier, it can transmit 10Gbps pseudo-random digital signal and 10Gbps sinusoidal analog signal, and demodulate 10Gbps pseudo-random The digital signal eye diagram, as shown in Figure 2, shows that the bit error rate of the 10Gbps pseudo-random digital signal transmitted by the system is 0.
如图3所示,该系统可传输10Gbps的正弦模拟信号。As shown in Figure 3, the system can transmit 10Gbps sinusoidal analog signals.
当采用微波信号作为载波时,可传输200Mbps的伪随机数字信号和800Mbps的正弦模拟信号,解调出200Mbps的伪随机数字信号眼图,如图4所示,该系统传输的200Mbps伪随机数字信号的误码率为0。When a microwave signal is used as the carrier, it can transmit a 200Mbps pseudo-random digital signal and an 800Mbps sinusoidal analog signal, and demodulate a 200Mbps pseudo-random digital signal eye diagram, as shown in Figure 4. The 200Mbps pseudo-random digital signal transmitted by the system The bit error rate is 0.
如图5所示,该系统可传输800Mbps的正弦模拟信号。As shown in Figure 5, the system can transmit 800Mbps sinusoidal analog signal.
本实施例在同一结构中获得了激光信号和微波信号的混合传输,当采用激光信号作为载波进行传输时可传输10Gbps的伪随机数字信号和正弦模拟信号,当采用高频微波信号作为载波进行传输时可传输200Mbps的伪随机信号和800Mbps的正弦模拟信号。In this embodiment, the hybrid transmission of laser signals and microwave signals is obtained in the same structure. When the laser signal is used as the carrier for transmission, a 10Gbps pseudo-random digital signal and sinusoidal analog signal can be transmitted. When a high-frequency microwave signal is used as the carrier for transmission It can transmit 200Mbps pseudo-random signal and 800Mbps sinusoidal analog signal.
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