CN110429986B - Multichannel millimeter wave generation and wireless transmission system based on single-side band modulation - Google Patents
Multichannel millimeter wave generation and wireless transmission system based on single-side band modulation Download PDFInfo
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- CN110429986B CN110429986B CN201910592417.4A CN201910592417A CN110429986B CN 110429986 B CN110429986 B CN 110429986B CN 201910592417 A CN201910592417 A CN 201910592417A CN 110429986 B CN110429986 B CN 110429986B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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- H—ELECTRICITY
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- 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
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Abstract
The invention belongs to the technical field of photo-generated millimeter waves, and particularly relates to a multichannel millimeter wave generation and wireless transmission system based on single-sideband modulation. The system comprises a sending end and a receiving end; the transmitting end comprises a digital-to-analog converter, a first electric amplifier, a second electric amplifier, a free single-mode laser, an I/Q modulator, a first polarization-preserving erbium-doped optical fiber optical amplifier, a single-mode optical fiber, a second polarization-preserving erbium-doped optical fiber optical amplifier, a tunable optical filter, a tunable optical attenuator, a photoelectric detector, a third electric amplifier and a Q-band transmitting antenna; the receiving end comprises a Q-band receiving antenna, a fourth electric amplifier and an oscilloscope; the invention only uses a single laser and a single I/Q modulator to generate the four-channel Q-band millimeter wave signals. Simple structure, low cost and strong system stability. The transmission distance of the optical signal entering the single-mode optical fiber can reach 80 kilometers, the generated Q-band four-channel millimeter wave signal can be wirelessly transmitted by 0.5 meter, and the method can be applied to high-speed millimeter wave wireless communication.
Description
Technical Field
The invention belongs to the technical field of photo-generated millimeter waves, and particularly relates to a multichannel millimeter wave generation and wireless transmission system based on single-sideband modulation.
Background
In order to meet the development requirement of high speed and stability of future 5G wireless communication, such as 1-10 Gb/s, a wavelength division multiplexing technology is required to be adopted, multichannel millimeter waves are generated on a millimeter wave frequency band, the system capacity is increased, and high-capacity millimeter wave wireless communication transmission can be realized. However, in the conventional multi-channel millimeter wave generation technical scheme, a plurality of lasers are mostly adopted as emission light sources, so that the system structure complexity is increased, the cost is increased, and meanwhile, the system instability is also improved, and therefore, the multi-channel millimeter wave generation and optical carrier wireless transmission system is not suitable for the development of future high-speed wireless systems. Therefore, it is necessary to research how to realize generation of multicarrier millimeter wave signals and wireless transmission based on a simple architecture. J, Zhang, J, Yu, N, Chi, Z, Dong, X, Li, G.K. Chang, "Multichannel 120-Gb/s Data Transmission Over 2 × 2 MIMO Fiber-Wireless Link at W-Band," IEEE Photon, technol, Lett., vol.25, No. 8, pp.780-783, Apr.2013 ]. Although only one laser source is used as a transmitting light source of the multi-carrier millimeter wave generation architecture in the schemes, another laser source is introduced at the front end of the photoelectric detector, and the multi-carrier millimeter wave is generated by beat frequency by using the optical heterodyne principle, so that not only is the cost increased, but also the phase noise problem generated by different laser sources is introduced. Meanwhile, the scheme utilizes a double-sideband modulation principle to generate a multi-carrier signal, so that the multi-carrier signal is easily influenced by optical fiber dispersion in the optical fiber transmission process to cause power loss. If the single sideband modulation principle is used, the problem of optical fiber dispersion can be effectively solved. The document [ X, Li, Y, Xu, and J, Yu, "Single-side band W-side modulator-wave signal generation by Single-side band I/Q modulator," Optics Letters, vol, 41, No. 18, pp. 4162 and 4165, Sep, 2016 ] proposes that an I/Q modulator is used to generate an upper sideband signal carrying modulation vector information, and at the same time, a radio frequency signal carrying no modulation information is generated at a lower sideband, and both signals can be subjected to beat frequency to generate a vector signal after passing through a photodetector, and since only the upper sideband signal carries the vector information, the upper sideband signal and the lower sideband signal are not affected by dispersion walk-off effect of the optical fiber. However, since the scheme only generates a single-channel millimeter wave signal, the transmission capacity of the wireless system is limited to be greatly increased.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide a single-sideband modulation-based multichannel millimeter wave generation and wireless transmission system, so as to generate a Q-band four-channel optical millimeter wave signal, and an optical-carrier wireless link realizes optical fiber transmission for 80 km and wireless transmission for 0.5 m. The multichannel millimeter wave generating system based on single-sideband modulation can avoid using a plurality of lasers as multichannel transmitting light sources, can realize the generation of multichannel millimeter waves by only using a single laser and an I/Q modulator, and has the advantages of simple structure, low cost and strong system stability. Based on the single-sideband modulation principle, the optical signal after I/Q modulation is not influenced by the dispersion walk-off effect of the optical fiber, and the optical signal after optical fiber transmission is not required to be subjected to dispersion compensation, so that the transmission distance of the optical signal entering the single-mode optical fiber can reach 80 kilometers, and the generated Q-band four-channel millimeter wave signal can be wirelessly transmitted for 0.5 meter. The system has the advantages of simple structure of the transmitting end and low cost, and can be applied to high-speed millimeter wave wireless communication.
The invention provides a multichannel millimeter wave generation and wireless transmission system based on single-side band modulation, which comprises a sending end and a receiving end, wherein the sending end is used for sending a millimeter wave signal to the receiving end;
(1) the transmitting end comprises a digital-to-analog converter, a first electric amplifier, a second electric amplifier, a free single-mode laser, an I/Q modulator, a first erbium-doped fiber optical amplifier, a single-mode fiber, a second erbium-doped fiber optical amplifier, a tunable optical filter, an adjustable optical attenuator, a photoelectric detector, a third electric amplifier and a Q-band transmitting antenna; wherein:
the digital-to-analog converter is used for combining the transmission data into a transmission baseband single-sideband signal, wherein one part of the transmission data is a multichannel upper sideband modulation signal f2, f3, f4 and f5 carrying modulation vector information, and the other part of the transmission data is a radio frequency lower sideband signal-f 1 not carrying modulation information;
the first electric amplifier is used for amplifying the power of an I port of a baseband single-sideband modulation signal, and the second electric amplifier is used for amplifying the power of a Q port;
the free single-mode laser is used for providing continuous wave light waves with the frequency of fc;
the I/Q modulator is used for modulating a high-power single-sideband signal upper sideband multichannel signal to the right fc + f2, fc + f3, fc + f4 and fc + f5 of fc on one path of continuous wave light wave, and modulating a lower sideband signal to the left fc-f 1 of the fc;
the first polarization-preserving erbium-doped optical fiber optical amplifier is used for amplifying the optical signal modulated by the I/Q modulator;
the single mode fiber is used for transmitting the optical signal amplified by the erbium-doped amplifier;
the second polarization-maintaining erbium-doped optical fiber optical amplifier is used for amplifying the optical signal transmitted by the single-mode optical fiber;
the tunable optical filter is used for reducing the spontaneous radiation noise after passing through the erbium-doped fiber amplifier;
the adjustable optical attenuator is used for adjusting the power of an optical signal entering the photoelectric detector;
a photoelectric detector for converting the upper sideband and the lower sideband signals positioned at two sides of the light wave fc into four-channel millimeter wave signals f1+ f2, f1+ f3, f1+ f4 and f1+ f5 in a beat frequency mode;
the third electric amplifier is used for amplifying the power of the generated four-channel millimeter wave signal;
the Q-band transmitting antenna is used for transmitting Q-band four-channel millimeter wave signals;
(2) the receiving end comprises a Q-band receiving antenna, a fourth electric amplifier and an oscilloscope; wherein:
the Q-band receiving antenna is used for receiving Q-band four-channel millimeter wave signals;
the fourth electric amplifier is used for amplifying the received four-channel millimeter wave signals;
the oscilloscope is used for recovering original transmission data from the received signal.
Preferably, the length of the single mode optical fiber is 80 km long.
Preferably, the wave bands of the third electric amplifier and the fourth electric amplifier are both between 0Hz and 50 Hz.
In the Q waveband multi-channel millimeter wave generating and wireless transmission system based on single-sideband modulation, in a sending end, off-line software is utilized to respectively generate a multi-channel upper sideband signal carrying modulation information and a lower sideband signal not carrying modulation information, a real part and an imaginary part of the single sideband signal after the two parts are combined respectively drive an I port and a Q port of an I/Q modulator, continuous light output by a single laser passes through an optical signal after I/Q modulation, and enters a photoelectric detector to generate a vector four-channel millimeter wave signal. After being amplified by the electric amplifier, the signal enters a sending antenna for transmission; the four-channel wireless millimeter wave signals received by the receiving antenna are amplified by an electric amplifier and finally enter an oscilloscope for receiving so as to recover the original sending data.
Compared with the prior art, the invention has the beneficial effects that:
the invention is based on a single laser and an I/Q modulator, utilizes the single-side band modulation principle to generate the vector millimeter wave signal of the four-channel Q wave band, and realizes the single-mode optical fiber transmission of the optical signal for 80 kilometers, and the wireless transmission of the Q wave band four-channel millimeter wave signal for 0.5 meter.
Drawings
Fig. 1 shows a single-sideband modulated Q-band four-channel millimeter wave generation and wireless transmission system architecture according to the present invention.
Reference numbers in the figures: the optical fiber amplifier comprises a digital-to-analog converter 1, an I/Q modulator 2, a first electrical amplifier 3, a second electrical amplifier 4, an external cavity modulation laser 5, a first erbium-doped fiber amplifier 6, a single-mode fiber 7 of 80 kilometers, a second erbium-doped fiber amplifier 8, a tunable filter 9, a tunable optical attenuator 10, a photodetector 11, a third electrical amplifier 12, a Q-band transmitting antenna 13, a Q-band receiving antenna 14, a fourth electrical amplifier 15 and an oscilloscope 16.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a single-sideband modulated Q-band four-channel millimeter wave generation and wireless transmission system architecture, which includes:
in a transmitting end, a multichannel upper sideband signal carrying modulation information and a lower sideband signal not carrying modulation information can be respectively generated by using off-line software, the multichannel upper sideband signal and the lower sideband signal carrying no modulation information are combined and then converted into analog signals through a digital-to-analog converter 1, a real part and a virtual part of each analog signal are respectively amplified through a first electric amplifier 3 and a second electric amplifier 4 so as to drive an I port and a Q port of an I/Q modulator 2, and a continuous wave light wave with the frequency fc from a free single-mode laser 5 is modulated by the I/Q modulator 2. The modulated light wave fc is amplified by a first erbium-doped optical fiber amplifier 6, enters a 80-kilometer single-mode optical fiber 7 for optical transmission, is amplified by a second erbium-doped optical fiber amplifier 8, sequentially enters a tunable filter 9 to reduce spontaneous radiation noise, enters a tunable optical attenuator 10 to adjust the optical power entering a photoelectric detector 11, and is further subjected to beat frequency conversion to be converted into a Q-band four-channel millimeter wave signal in the photoelectric detector 11. The four-channel vector millimeter wave signal is amplified by a third electric amplifier 12 with a frequency range of 0-50GHz and then enters a Q-band transmitting antenna 13 for transmission, the four-channel vector millimeter wave signal received by a receiving antenna 14 enters a fourth electric amplifier 15 with a frequency range of 0-50GHz for amplification, and finally the received signal is stored by an oscilloscope 16 so as to recover original transmission data.
In a specific embodiment, the multi-channel millimeter wave generation and wireless transmission system based on single-sideband modulation is adopted to simultaneously generate Q-band four-channel millimeter wave signals with frequencies of 34-GHz, 39-GHz, 44-GHz and 49-GHz.
In the specific embodiment, based on a single laser and an I/Q modulator, a single-sideband modulation principle is utilized to generate a four-channel Q-band vector millimeter wave signal, and single-mode fiber transmission of the optical signal for 80 kilometers is realized, and wireless transmission of the Q-band four-channel millimeter wave signal for 0.5 meter is realized.
In a word, the multichannel millimeter wave generation technology based on single-sideband modulation can realize generation and wireless transmission of Q-band four-channel millimeter wave signals by 0.5m, and is suitable for future high-speed millimeter wave wireless communication.
Claims (3)
1. A multichannel millimeter wave generation and wireless transmission system based on single-side band modulation is characterized by comprising a sending end and a receiving end;
(1) the transmitting end comprises a digital-to-analog converter, a first electric amplifier, a second electric amplifier, a free single-mode laser, an I/Q modulator, a first polarization-preserving erbium-doped optical fiber optical amplifier, a single-mode optical fiber, a second polarization-preserving erbium-doped optical fiber optical amplifier, a tunable optical filter, a tunable optical attenuator, a photoelectric detector, a third electric amplifier and a Q-band transmitting antenna; wherein:
the digital-to-analog converter is used for combining the transmission data into a transmission baseband single-sideband signal, wherein one part of the transmission data is a multi-channel upper sideband modulation signal f2, f3, f4 and f5 carrying modulation vector information, and the other part of the transmission data is a radio frequency lower sideband signal-f 1 not carrying modulation information;
the first electric amplifier is used for amplifying the power of an I port of a baseband single-sideband modulation signal, and the second electric amplifier is used for amplifying the power of a Q port;
the free single-mode laser is used for providing continuous wave light waves with the frequency of fc;
the I/Q modulator is used for modulating a high-power single-sideband signal upper sideband multichannel signal to the right fc + f2, fc + f3, fc + f4 and fc + f5 of fc on one path of continuous wave light wave, and modulating a lower sideband signal to the left fc-f 1 of the fc;
the first polarization-preserving erbium-doped optical fiber optical amplifier is used for amplifying the optical signal modulated by the I/Q modulator;
the single mode fiber is used for transmitting the optical signal amplified by the erbium-doped amplifier;
the second polarization-maintaining erbium-doped optical fiber optical amplifier is used for amplifying the optical signal transmitted by the single-mode optical fiber;
the tunable optical filter is used for reducing the spontaneous radiation noise after passing through the erbium-doped fiber amplifier;
the adjustable optical attenuator is used for adjusting the power of an optical signal entering the photoelectric detector;
a photoelectric detector for converting the upper sideband and the lower sideband signals positioned at two sides of the light wave fc into four-channel millimeter wave signals f1+ f2, f1+ f3, f1+ f4 and f1+ f5 in a beat frequency mode;
the third electric amplifier is used for amplifying the power of the generated four-channel millimeter wave signal;
the Q-band transmitting antenna is used for transmitting Q-band four-channel millimeter wave signals;
(2) the receiving end comprises a Q-band receiving antenna, a fourth electric amplifier and an oscilloscope; wherein:
the Q-band receiving antenna is used for receiving Q-band four-channel millimeter wave signals;
the fourth electric amplifier is used for amplifying the received four-channel millimeter wave signals;
the oscilloscope is used for recovering original transmission data from the received signal.
2. The single sideband modulation based multichannel millimeter wave generation and wireless transmission system according to claim 1, wherein the length of the single mode fiber is 80 km long.
3. The single sideband modulation based multichannel millimeter wave generation and wireless transmission system according to claim 1, wherein the third electric amplifier and the fourth electric amplifier have a wave band between 0Hz and 50 Hz.
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