CN115913371A - Photon-assisted terahertz optical fiber wireless communication real-time transmission system - Google Patents
Photon-assisted terahertz optical fiber wireless communication real-time transmission system Download PDFInfo
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- CN115913371A CN115913371A CN202211416704.8A CN202211416704A CN115913371A CN 115913371 A CN115913371 A CN 115913371A CN 202211416704 A CN202211416704 A CN 202211416704A CN 115913371 A CN115913371 A CN 115913371A
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Abstract
The invention belongs to the technical field of optical fiber-wireless communication, and particularly relates to a photon-assisted terahertz optical fiber wireless communication real-time transmission system. The system of the invention uses a coherent optical transmitter to generate an optical baseband signal, a polarization controller modulates the polarization incidence direction, and a polarization beam splitter divides the signal into two paths; coupling a light source and the two paths of signals by using an optical coupler, and beating the coupled signals by using a photodiode to generate terahertz wireless signals; performing wireless transmission of an electrical signal through a pair of polarization multiplexing antennas; carrying out down-conversion frequency mixing on the terahertz signal and a sinusoidal signal generated by frequency doubling, wherein the generated signal is used for driving a polarization multiplexing modulator; amplifying the optical signal by an erbium-doped fiber amplifier; one path of signal is selected by the adjustable optical filter, and the coherent optical receiver receives the signal. The system has simple structure and high transmission efficiency, and the terahertz frequency range for transmission is 100GHz-1THz. The invention can improve the real-time transmission performance of the terahertz radio signal.
Description
Technical Field
The invention belongs to the technical field of optical fiber-wireless communication, and particularly relates to a photon-assisted terahertz optical fiber wireless communication real-time transmission system.
Background
With the emergence of various information terminals, the communication capacity and the access demand increase at a high speed, an optical-wireless (Radio-over-Fiber, ROF) communication system which combines the advantages of low loss, high bandwidth and electromagnetic interference resistance of optical Fiber transmission and the advantages of wide coverage of wireless communication and flexible access becomes a research hotspot, and the wireless communication system presents an explosive growth trend of ultra-high-speed data transmission. Fiber optic wireless communication systems integrate the high mobility of wireless links and the large transmission capacity and long transmission distance of fiber optic links and can be used to provide high-speed mobile backhaul between wireless macro stations. The characteristics of high bandwidth, flexible deployment, low cost and the like of the optical fiber wireless communication system are highly matched with the requirement of wireless backhaul, so the high-speed optical fiber wireless communication system is often applied to wireless backhaul. In addition, the high-speed optical fiber wireless communication system can provide emergency service through the transmission advantages of the high-speed optical fiber wireless communication system when the problem that a large-capacity long-distance optical cable is cut off due to natural disasters such as earthquakes, tsunamis and typhoons is solved.
The peak rate of current 5G access is 1 to 20Gbit/s, but it still cannot meet the ever-increasing data traffic demand in future wireless communications. For example, the minimum data rate of a Virtual Reality (VR) device is 10 Gbit/s, the data rate required for uncompressed ultra high definition video is 24 Gbit/s, and the data rate of 3D video reaches 100 Gbit/s. In order to realize the data transmission rate of 100Gbit/s or even 1Tbit/s and meet the speed requirements of super 5G and 6G communication, the photon-assisted terahertz wave technology provides certain feasibility. Terahertz frequency has huge bandwidth and can meet the basic requirements of 5G and 6G communication. The currently reported photon-assisted terahertz optical fiber wireless communication system is relatively complex in transmitter and receiver, uses a plurality of polarization controllers and a plurality of pairs of antennas to transmit terahertz wave wireless signals, is relatively single in signal modulation mode, is relatively complex in the whole system, and can be further simplified.
Therefore, the invention provides a more simplified photon-assisted terahertz optical fiber wireless communication real-time transmission system, in the system, a polarization controller, a pair of polarization multiplexing antennas and a pair of intensity modulators are used for simplifying the system, and the terahertz signal transmission of 100GHz-1THz can be realized. The method comprises the steps that a coherent light transmitter generates an optical baseband signal, signal transmission is carried out on a standard single-mode optical fiber, the polarization incidence direction is modulated through a polarization controller, a polarization beam splitter is used for separating an X polarization component and a Y polarization component of a light wave, the signal is divided into two paths for transmission, a light source 1 of a laser and the two paths of signals are coupled through an optical coupler, beat frequency processing is carried out on the coupled signals through a photodiode to generate terahertz wave wireless signals, the two paths of optical signals are converted into electric signals, the electric signals are transmitted through a polarization multiplexing antenna, the transmitted terahertz signals can be directly modulated, down-conversion modulation can be carried out through a frequency multiplier and a radio frequency source, a laser 2 is used as optical carrier input, the electric signals are converted into optical signals through a polarization multiplexing modulator, the optical signals are enhanced through an erbium-doped optical fiber amplifier, one path of signals is reserved through an adjustable optical filter, transmission is carried out on the standard single-mode optical fiber, before the signals enter a polarization multiplexing coherent receiver, the power of the signals entering a polarization multiplexing receiver is adjusted through a tunable optical power meter, the coherent light receiver is used for receiving the signals, the transmission efficiency of the whole terahertz transmission system is improved through simplified equipment.
Disclosure of Invention
The invention aims to provide a photon-assisted terahertz optical fiber wireless communication real-time transmission system which is simple in equipment and high in transmission efficiency.
The photon-assisted terahertz optical fiber wireless communication real-time transmission system provided by the invention uses a coherent optical transmitter to generate an optical baseband signal, and transmits the optical baseband signal through a standard single-mode optical fiber. The polarization incident direction is modulated by a polarization controller, and the signal is divided into two paths by a polarization beam splitter. And then, the first light source 1 and the two separated signals are coupled by an optical coupler, and the coupled signals are subjected to beat frequency processing by using a photodiode to generate a terahertz wireless signal. Radio transmission of electrical signals is performed through a pair of polarization multiplexing antennas. The generated terahertz signal is mixed with a sinusoidal signal generated by the radio frequency source through frequency multiplication in a down-conversion mode, and the generated signal is used for driving the polarization multiplexing modulator to load the signal on the second light source 2. The electrical signal is converted to an optical signal using a polarization multiplexing modulator, and the optical signal is then amplified by an erbium doped fiber amplifier. One path of signal is selected by the adjustable optical filter and transmitted on the standard single-mode optical fiber, and then the power of the signal entering the polarization multiplexing receiver is adjusted through the tunable optical power meter. Finally, a coherent optical receiver is used for receiving the signal.
Specifically, the terahertz optical fiber wireless communication real-time transmission system includes:
a coherent optical transmitter for generating an optical baseband signal;
a standard single mode optical fiber for transmitting optical signals;
a polarization controller for modulating a polarization incident direction;
the polarization beam splitter is used for splitting the signal into two paths of signals;
an external cavity laser used as a local oscillator light source 1;
the optical coupler is used for coupling the external cavity laser and the two separated signals; the parallel balanced photodiode is used for heterodyne beat frequency generation of terahertz wave wireless signals and conversion of the optical signals into electric signals;
the polarization multiplexing antenna is used for transmitting terahertz wave wireless signals;
a radio frequency source for generating a sinusoidal signal;
a frequency multiplier for increasing the signal frequency;
an external cavity laser as the light source 2;
the polarization multiplexing modulator is used for converting the terahertz wave wireless signal into an optical signal;
an erbium-doped fiber amplifier for enhancing optical signals;
the adjustable optical filter is used for inhibiting the upper sideband (or the lower sideband) of the optical signal, the central optical carrier and the amplified radiation noise and reserving the lower sideband (or the upper sideband) of the signal;
the tunable optical power meter is used for adjusting the power of the signal entering the polarization multiplexing receiver;
a coherent optical receiver for receiving a signal.
In the invention, the frequency range of the terahertz wave wireless signal is 100GHz-1THz.
In the invention, a pair of polarization multiplexing antennas is used for carrying out polarization multiplexing transmission on terahertz wave wireless signals.
In the present invention, the modulation mode may be direct modulation or down-conversion modulation.
In the invention, the polarization multiplexing modulator is equivalent to the combination of the optical coupler, the two Mach-Zehnder modulators and the polarization beam splitter, and the processing and combination of signals are simpler and more convenient.
The terahertz wireless communication real-time transmission system comprises the following parts in connection relation and working process:
generating an optical baseband signal by a coherent optical transmitter, and transmitting the optical baseband signal by a standard single mode optical fiber;
modulating the polarization incidence direction by a polarization controller, and dividing a signal into two paths by a polarization beam splitter; the optical coupler couples the light source and the two separated signals;
performing beat frequency processing on the coupled signal by a photodiode to generate a terahertz wireless signal;
performing wireless transmission of electrical signals by a pair of polarization multiplexing antennas;
the radio frequency source performs down-conversion frequency mixing on the signals generated by frequency multiplication and the terahertz wireless signals to generate two paths of signals; the generated signal is used for driving a polarization multiplexing modulator to load the signal on a light source;
converting the electric signal into an optical signal by a polarization multiplexing modulator, and then amplifying the signal by an erbium-doped fiber amplifier;
selecting a path of signal by an adjustable optical filter, and transmitting the signal on standard single-mode optics;
the power of the signal entering the polarization multiplexing receiver is adjusted by a tunable optical power meter, and the signal is received by a coherent optical receiver to complete transmission.
The invention utilizes a photon-assisted terahertz optical fiber wireless communication real-time transmission system, and has the characteristics of simple equipment, various modulation modes, high transmission efficiency and the like. The system mainly uses the polarization multiplexing antenna and the polarization multiplexing modulator, greatly reduces the system complexity, simplifies the system structure, avoids the use of a plurality of groups of antennas, a polarization beam splitter with a complex structure, a 90-degree optical mixer, a polarization optical combiner, a polarization optical coupler and the like, and reduces the system cost.
Drawings
FIG. 1 is a structural diagram of a terahertz optical fiber wireless communication real-time transmission system in the invention.
Fig. 2 is a diagram of an optical signal transmitted using a coherent optical transmitter. The structure diagram of the transmitting device is shown in (a), and the schematic diagram of the optical signal spectrum after the signal is loaded to the optical carrier is shown in (b).
Fig. 3 is a transmitting base station structure. Wherein, (a) is a structure diagram of a transmitting base station, and (b) is a signal spectrum schematic diagram after beat frequency of an optical signal and local oscillator light.
Fig. 4 is a receiving base station structure. The spectrum chart of the signal after modulation of the polar multiplexing modulator is shown in (a) as a receiving base station structure chart, and the spectrum chart of the signal lower sideband only is reserved for the filter.
Fig. 5 is a diagram of a coherent optical receiver device.
The reference numbers in the figures: the optical fiber coupler comprises a coherent optical transmitter 1, a first standard single-mode optical fiber 2, a second standard single-mode optical fiber 22, a polarization controller 3, a polarization beam splitter 4, an external cavity laser 5, a first optical coupler 6, a second optical coupler 66, a third optical coupler 666, a first parallel balanced photodiode 7, a second parallel balanced photodiode 77, a polarization multiplexing antenna 8, a first frequency multiplier 9, a second frequency multiplier 99, a radio frequency source 10, an external cavity laser 11, a polarization multiplexing modulator 12, an erbium-doped optical fiber amplifier 13, an adjustable optical filter 14, a tunable optical power device 15 and a coherent optical receiver 16.
Detailed Description
The present invention will be described in detail below with reference to specific experimental examples and the accompanying drawings.
The invention discloses a terahertz optical fiber wireless communication real-time transmission system based on photon assistance, which is shown in a figure 1; the components and functions are described as follows:
coherent optical transmitter 1 for generating optical baseband signal a 1 (t) at a frequency fS, the optical signal a1 (t) is transmitted over a first standard single mode optical fibre 2, as shown in figure 1.
And the polarization controller 3 modulates the polarization incidence direction, and the polarization beam splitter 4 divides the signal into two paths of signals. An external cavity laser 5 as a local oscillator light source for generating a laser beam having a wavelength λ 1 With frequency fL for the light source 1. The first optical coupler 6, the second optical coupler 66 and the third optical coupler 6665 are used for coupling two signal lights and a light source. The first balanced photodiode 7 and the second balanced photodiode 77 are connected in parallel, a beat frequency is performed on the signal, a terahertz wave wireless signal is generated, the frequency of the terahertz signal is the frequency difference Δ f between the signal light and the local oscillation light, and the optical signal is converted into an electrical signal, as shown in fig. 2.
And the polarization multiplexing antenna 8 is used for transmitting the terahertz wave wireless signals. The radio frequency device 10 generates sinusoidal signals through the first frequency multiplier 9 and the second frequency multiplier 99, and is used for performing down-conversion frequency mixing with terahertz wave wireless signals, and the generated two paths of signals drive the polarization multiplexing modulator 12.
The external cavity laser 11 generates a light source 2 having a wavelength λ 2, and loads the mixed signal to the light source 2. The polar-multiplex modulator 12 converts the electrical signal into an optical signal in which there is a surplus central optical carrier, at fo, in addition to the upper and lower sidebands (the upper and lower sidebands having central frequencies fo + fIF, fo-fIF, respectively). And an erbium-doped fiber amplifier 13 for amplifying the optical signal. A tunable optical filter 14 for retaining only the lower sideband (or the upper sideband) of the optical signal with a center frequency fo-fIF (fo-fIF = fS) as shown in fig. 3. A standard single mode optical fiber 22 for optical signal transmission, a tunable optical power device 15 for adjusting the power of the signal into the polarization multiplexing receiver, and a coherent optical receiver 16 for receiving the signal, as shown in fig. 4.
The photon-assisted terahertz optical fiber wireless communication real-time transmission system is specifically connected in the following manner, as shown in fig. 5.
The output end of a coherent optical transmitter 1 is connected with the input end of a polarization controller 3 through a standard single mode fiber 2, the output end of the polarization controller 3 is connected with the input end of a polarization beam splitter 4 through an optical fiber, the output end of the polarization beam splitter 4 is respectively connected with the input ends of a first optical coupler 6 and a third optical coupler 666 through optical fibers, the output end of an external cavity laser 5 is connected with the input end of a second optical coupler 66 through an optical fiber, the second optical coupler 66 is respectively connected with the first optical coupler 6 and the third optical coupler 666 through optical fibers, the output end of the first optical coupler 6 is connected with the input end of a first photodiode 7 through an optical fiber, the output end of the third optical coupler 666 is connected with the input end of a second photodiode 77 through an optical fiber, the output end of the first photodiode 7 is connected with a polarization multiplexing antenna 8 through a cable, the output end of the second photodiode 77 is connected with the polarization multiplexing antenna 8 by a cable, the polarization multiplexing antenna 8 is connected with the input end of the polarization multiplexing modulator 12 by a cable, the radio frequency unit 10 is respectively connected with the first frequency multiplier 9 and the second frequency multiplier 99 by cables, the first frequency multiplier 9 and the second frequency multiplier 99 are connected to the system by cables, the output end of the external cavity laser 11 is connected with the input end of the polarization multiplexing modulator 12 by a cable, the output end of the polarization multiplexing modulator 12 is connected with the input end of the erbium-doped fiber amplifier 13 by an optical fiber, the output end of the erbium-doped fiber amplifier 13 is connected with the input end of the adjustable optical filter 14 by an optical fiber, the output end of the adjustable optical filter 14 is connected with the input end of the tunable optical power meter 15 by the second standard single-mode optical fiber 22, and the output end of the tunable optical power meter 15 is connected with the input end of the coherent optical receiver 16 by an optical fiber.
The terahertz optical fiber wireless communication transmission system is added between the coherent optical transmitter and the optical receiver, the system structure is simplified, the complexity is low, the transmission effect is good, a transmission mode that optical signals are converted into electric signals from optical signals is adopted, devices such as a polarization multiplexing antenna and a polarization multiplexing modulator are used, the frequency range of the terahertz signals is 100GHz-1THz and is large, and the system efficiency is improved by adopting a down-conversion modulation mode. The terahertz optical fiber wireless communication real-time transmission system can be obviously simplified, and has obvious advantages compared with other transmission devices.
Claims (4)
1. The utility model provides a supplementary terahertz of photon optic fibre wireless communication real-time transmission system which characterized in that includes:
a coherent optical transmitter for generating an optical baseband signal;
a single mode optical fiber for transmitting an optical signal;
a polarization controller for modulating a polarization incident direction;
the polarization beam splitter is used for splitting the signal into two paths of signals;
an external cavity laser used as a local oscillation light source 1;
the optical coupler is used for coupling the external cavity laser and the two separated signals; the parallel balanced photodiode is used for generating a terahertz wave wireless signal by heterodyne beat frequency and converting the optical signal into an electric signal;
the polarization multiplexing antenna is used for transmitting terahertz wave wireless signals;
a radio frequency source for generating a sinusoidal signal;
a frequency multiplier for increasing the signal frequency;
an external cavity laser as the light source 2;
the polarization multiplexing modulator is used for converting the terahertz wave wireless signal into an optical signal;
an erbium-doped fiber amplifier for enhancing optical signals;
the adjustable optical filter is used for inhibiting an upper sideband or a lower sideband of an optical signal, a central optical carrier and amplified radiation noise and reserving the lower sideband or the upper sideband of the signal;
the tunable optical power meter is used for adjusting the power of the signal entering the polarization multiplexing receiver;
a coherent optical receiver for receiving a signal.
2. The photon-assisted terahertz optical fiber wireless communication real-time transmission system according to claim 1, wherein the working process is as follows:
generating an optical baseband signal by a coherent optical transmitter, and transmitting the optical baseband signal by a standard single mode optical fiber;
modulating the polarization incidence direction by a polarization controller, and dividing signals into two paths by a polarization beam splitter; the optical coupler couples the light source and the two separated signals;
carrying out beat frequency processing on the coupled signals by a photodiode to generate terahertz wireless signals;
performing wireless transmission of electrical signals by a pair of polarization multiplexing antennas;
the radio frequency source performs down-conversion frequency mixing on the signals generated by frequency multiplication and the terahertz wireless signals to generate two paths of signals; the generated signal is used for driving a polarization multiplexing modulator to load the signal on a light source;
converting the electric signal into an optical signal by a polarization multiplexing modulator, and then amplifying the signal by an erbium-doped fiber amplifier;
selecting a path of signal by an adjustable optical filter, and transmitting the signal on standard single-mode optics;
the power of the signal entering the polarization multiplexing receiver is adjusted by a tunable optical power meter, and the signal is received by a coherent optical receiver to complete transmission.
3. The photon-assisted terahertz optical fiber wireless communication real-time transmission system according to claim 1, wherein:
the coherent optical transmitter (1) generates an optical baseband signal a 1 (t) frequency fS, optical signal a 1 (t) transmission over a first standard single mode fibre (2);
the polarization controller (3) is used for modulating a polarization incidence direction; the polarization beam splitter (4) divides the signal into two paths of signals;
the external cavity laser (5) is used as a local oscillator light source to generate a light with a wavelength of lambda 1 The first light source of (1), frequency is fL; first of allThe optical coupler (6), the second optical coupler (66) and the third optical coupler (666) are used for coupling the two paths of signal light and the light source;
the terahertz wave wireless signal generating device comprises a first balance photodiode (7) and a second balance photodiode (77) which are connected in parallel, wherein the signals are subjected to beat frequency to generate a terahertz wave wireless signal, the frequency of the terahertz wave wireless signal is the frequency difference delta f between signal light and local oscillator light, and the optical signal is converted into an electric signal;
the polarization multiplexing antenna (8) is used for transmitting terahertz wave wireless signals; the radio frequency device (10) generates sinusoidal signals through the first frequency multiplier (9) and the second frequency multiplier (99) and is used for carrying out down-conversion frequency mixing with terahertz wave wireless signals, and the generated two paths of signals drive the polarization multiplexing modulator (12);
the external cavity laser (11) generates a second light source with the wavelength of lambda 2, and the mixed signal is loaded on the second light source; the polarization multiplexing modulator (12) converts the electric signal into an optical signal, and the signal has redundant central optical carriers except upper and lower sidebands at the moment, and the frequency of the central optical carriers is fo; the erbium-doped fiber amplifier (13) is used for amplifying optical signals; a tunable optical filter (14) for retaining only a lower or upper sideband of the optical signal, having a center frequency fo-fIF; the second standard single mode fibre 22 is used for optical signal transmission, the tunable optical power device (15) is used for adjusting the power of signals entering the polarization multiplexing receiver, and the coherent optical receiver (16) is used for receiving signals.
4. The photon-assisted terahertz optical fiber wireless communication real-time transmission system according to claim 3, wherein:
the output end of the coherent optical transmitter (1) is connected with the input end of the polarization controller (3) through a first single-mode optical fiber (2); the output end of the polarization controller (3) is connected with the input end of the polarization beam splitter (4) by optical fibers; the output end of the polarization beam splitter (4) is respectively connected with the input ends of the first optical coupler (6) and the third optical coupler (666) by optical fibers; the output end of the external cavity laser (5) is connected with the input end of a second optical coupler (66) by optical fibers; the second optical coupler (66) is respectively connected with the first optical coupler (6) and the third optical coupler (666) by optical fibers; the output end of the first optical coupler (6) is connected with the input end of the first photodiode (7) by an optical fiber, and the output end of the third optical coupler (666) is connected with the input end of the second photodiode (77) by an optical fiber; the output end of the first photodiode (7) is connected with the polarization multiplexing antenna (8) by a cable, and the output end of the second photodiode (77) is connected with the polarization multiplexing antenna (8) by a cable; the input ends of the polarization multiplexing antenna (8) and the polarization multiplexing modulator (12) are connected by cables, and the radio frequency device (10) is respectively connected with the first frequency multiplier (9) and the second frequency multiplier (99) by cables; the first frequency multiplier (9) and the second frequency multiplier (99) are connected into the system through cables; the output end of the external cavity laser (11) is connected with the input end of the polarization multiplexing modulator (12) by a cable; the output end of the polarization multiplexing modulator (12) is connected with the input end of the erbium-doped fiber amplifier (13) by an optical fiber; the output end of the erbium-doped fiber amplifier (13) is connected with the input end of the adjustable optical filter (14) by an optical fiber; the output end of the adjustable optical filter (14) is connected with the input end of the tunable optical power meter (15) through a second standard single-mode optical fiber (22); the output end of the tunable optical power meter (15) is connected with the input end of the coherent optical receiver (16) by an optical fiber.
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| CN117675033A (en) * | 2024-02-02 | 2024-03-08 | 网络通信与安全紫金山实验室 | Photon terahertz distributed antenna system and terahertz signal transmission method |
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| CN117675033A (en) * | 2024-02-02 | 2024-03-08 | 网络通信与安全紫金山实验室 | Photon terahertz distributed antenna system and terahertz signal transmission method |
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