CN107682044B - Laser and microwave mixed transmission system - Google Patents
Laser and microwave mixed transmission system Download PDFInfo
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- CN107682044B CN107682044B CN201710906472.7A CN201710906472A CN107682044B CN 107682044 B CN107682044 B CN 107682044B CN 201710906472 A CN201710906472 A CN 201710906472A CN 107682044 B CN107682044 B CN 107682044B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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Abstract
A laser and microwave hybrid transmission system belongs to the technical field of communication, and aims at the defects of the prior art, a first tunable semiconductor laser is connected with a d port of a second 3dB coupler, and an f port of the second 3dB coupler is sequentially connected with a first photoelectric detector, a high-pass filter, a second microwave amplifier and a microwave transmitting antenna; the arbitrary waveform generator, the first microwave amplifier and the intensity modulator are connected in sequence; the second tunable semiconductor laser is connected with an intensity modulator, and the intensity modulator is connected with a port a of the first 3dB coupler; the port b of the first 3dB coupler is connected with the port e of the second 3dB coupler; the port c of the first 3dB coupler is sequentially connected with the optical amplifier and the laser transmitting antenna; the microwave transmitting antenna and the microwave receiving antenna correspondingly transmit and receive signals, and the microwave receiving antenna is connected with the detector; the laser emitting antenna and the light receiving antenna correspond to each other to send and receive signals, and the light receiving antenna is connected with the second photoelectric detector.
Description
Technical Field
The invention relates to a laser and microwave hybrid transmission system, belonging to the technical field of communication; the invention can be applied to the fields of Internet of things, mobile communication, satellite communication and the like.
Background
In order to satisfy future satellite communication systems, it is necessary to develop hybrid transmission of laser and microwave. In a space communication system, the channel between the satellites is almost vacuum, and thousands of kilometers and even tens of thousands of kilometers of communication distance can be realized by fully utilizing laser. And between the satellite and the ground, the channel of laser communication passes through the atmosphere, and the climate change of the atmosphere and the existing atmospheric turbulence can absorb and scatter light, so that the states of the light such as intensity, frequency, phase, polarization and the like are randomly changed. These variations can make acquisition, tracking of signals based on laser communication systems extremely difficult and even render the communication system useless. The performance of microwave communication is relatively less affected by turbulence, so that efficient and continuous communication between satellites and the ground is effectively guaranteed. By means of natural complementarity of laser communication and microwave communication, a future satellite communication system should be capable of fully combining the characteristics of microwave and laser communication technologies and adopting a transmission mode of coexistence and mixing of laser and microwave. The laser and microwave hybrid communication system is used as a solution for effectively solving the problems of system error rate increase, usability reduction and the like caused by severe weather in the wireless communication process. The two communication modes complement each other, and a communication link can be selected according to the receiving bit error rate or the signal-to-noise ratio of the receiving end, so that the communication system still has high availability and reliability when facing severe weather. Laser communication can provide high-rate communication services, while microwave communication provides relatively low communication rates. Therefore, in the actual use process, the laser communication link can be used as a main communication link, the microwave communication link is used as a backup link of the laser communication link, and the backup link is started when the main communication link cannot guarantee basic requirements or communication is interrupted. Thereby ensuring reliability of the communication link. The laser and microwave hybrid communication system has been paid more and more attention at home and abroad, the system meets the requirements of users on high speed, safety, stability and reliability of a wireless communication system, and has great application prospects in the fields of internet of things, mobile communication, satellite communication and the like.
Disclosure of Invention
Aiming at the defect that the existing laser and microwave hybrid transmission system can only receive and transmit information respectively based on a laser communication system and a microwave communication system, the invention provides a laser and microwave hybrid transmission system based on two tunable semiconductor lasers.
The invention adopts the following technical scheme:
the laser and microwave hybrid transmission system is characterized by comprising 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, a first photoelectric detector, an optical amplifier, a high-pass filter, a laser transmitting antenna, a second microwave amplifier, a microwave transmitting antenna, a microwave receiving antenna, an optical receiving antenna, a detector and a second photoelectric detector; the first tunable semiconductor laser is connected with a d port of the second 3dB coupler, and an f port of the second 3dB coupler is sequentially connected with the first photoelectric detector, the high-pass filter, the second microwave amplifier and the microwave transmitting antenna; the arbitrary waveform generator, the first microwave amplifier and the intensity modulator are connected in sequence; the second tunable semiconductor laser is connected with an intensity modulator, and the intensity modulator is connected with an a port of the first 3dB coupler; the b port of the first 3dB coupler is connected with the e port of the second 3dB coupler; the port c of the first 3dB coupler is sequentially connected with the optical amplifier and the laser transmitting antenna; the microwave transmitting antenna and the microwave receiving antenna correspondingly transmit and receive signals, the microwave receiving antenna is connected with the detector, and the oscilloscope is connected with the detector and used for observation; the laser transmitting antenna and the light receiving antenna correspondingly transmit and receive signals, the light receiving antenna is connected with the second photoelectric detector, and the second oscilloscope is connected with the second photoelectric detector and used for observing.
The invention has the beneficial effects 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 signals and microwave signals in the same system. In this way, the possibility of communication interruption of the communication system in the presence of severe weather is solved, and the reliability of the communication system is increased. The laser and microwave hybrid transmission system has the advantage of improving the reliability of the system based on the hybrid transmission of the laser signal and the microwave signal, and has wide application prospect in the fields of Internet of things, mobile communication, satellite communication and the like.
In addition, the invention has simple structure, low loss, stable performance and easy integration with an optical fiber system.
Drawings
Fig. 1 is a schematic structural diagram of a laser and microwave hybrid transmission system.
Fig. 2 is an eye diagram of a pseudo-random digital signal demodulated at 10Gbps when a laser signal is used as a carrier wave.
Fig. 3 is a waveform diagram of a sinusoidal analog signal demodulated at 10Gbps when a laser signal is used as a carrier.
Fig. 4 is an eye diagram of a pseudo-random digital signal demodulated at 200Mbps when a microwave signal is used as a carrier wave.
FIG. 5 is a waveform diagram of a sinusoidal analog signal demodulated at 800Mbps when a microwave signal is used as a carrier.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
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, a first 3dB coupler 6, a second 3dB coupler 7, a first photodetector 8, an optical amplifier 9, a high-pass filter 10, a laser transmitting antenna 11, a second microwave amplifier 12, a microwave transmitting antenna 13, a microwave receiving antenna 14, a light receiving antenna 15, a detector 16, and a second photodetector 17. The first tunable semiconductor laser 1 is connected with a d port of the second 3dB coupler 7, and an f port of the second 3dB coupler 7 is sequentially connected with the first photoelectric detector 8, the high-pass filter 10, the second microwave amplifier 12 and the microwave transmitting antenna 13. 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 an 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 to the optical amplifier 9 and the laser transmitting antenna 11 in this order. The microwave transmitting antenna 13 is corresponding to the microwave receiving antenna 14 for transmitting and receiving signals, the microwave receiving antenna 14 is connected with the detector 16, and the oscilloscope 18 is connected with the detector 16 for observation. The laser emitting antenna 11 and the light receiving antenna 15 correspondingly receive and transmit signals, the light receiving antenna 15 is connected with the second photoelectric detector 17, and the second oscilloscope 19 is connected with the second photoelectric detector 17 for observation.
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.
The arbitrary waveform generator 3 is used to generate pseudo-random digital signal and sinusoidal analog signal pulse waveforms at different rates.
The high pass filter 10 is used to filter out low frequency components.
The emission wavelength of the first tunable semiconductor laser 1 is adjusted to 1550nm, 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 enters the intensity modulator 5, the laser sent by the second tunable semiconductor laser 2 is changed into a laser signal with loading modulation information after passing through the intensity modulator 5, the laser signal with the loading modulation information enters the port a of the first 3dB coupler 6, and 50% of the laser signal with the loading modulation information is output from the port c of the first 3dB coupler 6, enters the optical amplifier 9, is amplified and then is emitted by the laser emitting antenna 11.
The other 50% of laser signals with loading modulation information are output from a port b of the first 3dB coupler 6 and enter a port e of the second 3dB coupler 7, laser signals emitted by the first tunable semiconductor laser 1 enter from a port d of the second 3dB coupler 7, two laser signals are coupled in the second 3dB coupler 7 and jointly enter the first photoelectric detector 8 to generate high-frequency microwave signals with loading modulation information, and the high-frequency microwave signals with the loading modulation information are filtered by the high-pass filter 10 to remove low-frequency components, amplified by the second microwave amplifier 12 and then emitted by the microwave emitting antenna 13.
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 then enters the first oscilloscope 18 for observation. The laser signal with the loading information transmitted 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.
The invention discloses a laser and microwave hybrid transmission system based on two tunable semiconductor lasers, which can transmit 10Gbps pseudo-random digital signals and 10Gbps sine analog signals and demodulate 10Gbps pseudo-random digital signal eye diagrams when laser signals are used as carriers, and the bit error rate of the 10Gbps pseudo-random digital signals transmitted by the system is 0 as shown in figure 2.
As shown in fig. 3, the system can transmit sinusoidal analog signals at 10 Gbps.
When the microwave signal is used as a carrier, 200Mbps pseudo-random digital signals and 800Mbps sinusoidal analog signals can be transmitted, and 200Mbps pseudo-random digital signal eye diagrams can be demodulated, as shown in FIG. 4, the error rate of the 200Mbps pseudo-random digital signals transmitted by the system is 0.
As shown in FIG. 5, the system can transmit a sinusoidal analog signal at 800 Mbps.
The present embodiment obtains hybrid transmission of a laser signal and a microwave signal in the same configuration, and can transmit a pseudo random signal and a sinusoidal analog signal at 10Gbps when transmission is performed using the laser signal as a carrier, and can transmit a pseudo random signal at 200Mbps and a sinusoidal analog signal at 800Mbps when transmission is performed using a high-frequency microwave signal as a carrier.
Claims (4)
1. The laser and microwave hybrid transmission system is characterized by comprising 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), a first 3dB coupler (6), a second 3dB coupler (7), a first photoelectric detector (8), an optical amplifier (9), a high-pass filter (10), a laser transmitting antenna (11), a second microwave amplifier (12), a microwave transmitting antenna (13), a microwave receiving antenna (14), a light receiving antenna (15), a detector (16) and a second photoelectric detector (17);
the first tunable semiconductor laser (1) is connected with a d port of a second 3dB coupler (7), and an f port of the second 3dB coupler (7) is sequentially connected with a first photoelectric detector (8), a high-pass filter (10), a second microwave amplifier (12) and a microwave transmitting antenna (13);
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 with an intensity modulator (5), and the intensity modulator (5) is connected with an a port of the first 3dB coupler (6);
the b port of the first 3dB coupler (6) is connected with the e port of the second 3dB coupler (7); the port c of the first 3dB coupler (6) is sequentially connected with the optical amplifier (9) and the laser transmitting antenna (11);
the microwave transmitting antenna (13) and the microwave receiving antenna (14) correspondingly transmit and receive signals, the microwave receiving antenna (14) is connected with the detector (16), and the oscilloscope (18) is connected with the detector (16);
the laser emitting antenna (11) and the light receiving antenna (15) correspondingly transmit and receive signals, the light receiving antenna (15) is connected with the second photoelectric detector (17), and the second oscilloscope (19) is connected with the second photoelectric detector (17).
2. The hybrid laser and microwave transmission system according to claim 1, characterized in that 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.
3. The hybrid laser and microwave transmission system according to claim 1, characterized in that the arbitrary waveform generator (3) is configured to generate pseudo-random digital signal and sinusoidal analog signal pulse waveforms of different rates.
4. The hybrid laser and microwave transmission system according to claim 1, characterized in that the high-pass filter (10) is used to filter out low-frequency components.
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| CN201710906472.7A CN107682044B (en) | 2017-09-29 | 2017-09-29 | Laser and microwave mixed transmission system |
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| CN201710906472.7A CN107682044B (en) | 2017-09-29 | 2017-09-29 | Laser and microwave mixed transmission system |
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| CN107682044B true CN107682044B (en) | 2019-12-24 |
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| CN109889264B (en) * | 2019-01-30 | 2020-12-11 | 中国科学院半导体研究所 | Self-locking and self-tracking space optical communication transmitting end, receiving end, system and method |
| CN112564783B (en) * | 2020-11-04 | 2022-11-08 | 北京遥测技术研究所 | Resource-saving laser radio frequency integrated communication method |
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