CN101715249B - Optical-fiber wireless system for full-duplex communication - Google Patents
Optical-fiber wireless system for full-duplex communication Download PDFInfo
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- CN101715249B CN101715249B CN 200910310986 CN200910310986A CN101715249B CN 101715249 B CN101715249 B CN 101715249B CN 200910310986 CN200910310986 CN 200910310986 CN 200910310986 A CN200910310986 A CN 200910310986A CN 101715249 B CN101715249 B CN 101715249B
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Abstract
The invention relates to an optical-fiber wireless system for full-duplex communication, which consists of a central station and a base station, wherein the central station and the base station are connected through an optical-fiber transmission links; the central station generates subcarrier signals by mixing baseband signals with radio frequency sine-wave signals, generates optical double-sideband differential phase-shift keying signals through the modulation of an optical phase modulator, performs power amplification, and then transmits the signals to the base station; the base station separates the signals transmitted by the central station; the signals are divided into an upper way and a lower way through an optical splitter; the upper way generates carrier-suppressed differential phase-shift keying optical-carried millimeter waves which are converted into downlink millimeter wave signals through photoelectric conversion and then sent to wireless terminals through antennas; the lower way generates reference local oscillator signals through photoelectric conversion, mixes the reference local oscillator signals with uplink millimeter wave signals, and generates uplink baseband signals through down conversion; and central carrier waves are re-modulated by the uplink baseband signals and then transmitted back to the central station. The system has the advantages of simplifying generation devices for optical-carried millimeter waves and reducing cost, along with simple flexible structure, strong extensibility, more compact structure and easiness for integration.
Description
Technical field
The present invention relates to a kind of optical fiber-wireless (Radio-Over-Fiber abbreviates ROF as) communication technology, particularly a kind of generation carrier suppressed-differential phase keying (DPSK) light carries millimeter-wave signal, and realizes the full-duplex communication of optical-fiber wireless system.
Technical background
Optical fiber-wireless communication technology adopts optical fiber link to transmit radio signal; Ultra bandwidth, the high reliability of characteristic such as removable, the point-to-multipoint access of broadband wireless communications and optical fiber communication are combined, desirable solution is provided for big capacity, radio signal wire transmission cheaply and the super wideband wireless that surpasses Gbit/s insert.For optical-fiber wireless system, the generation that high-quality light is carried millimeter wave is to realize one of key technology of communication.In recent years, the researcher has proposed many light and has carried millimeter wave generation scheme both at home and abroad, carries millimeter wave such as double-side band light, and monolateral band light carries millimeter wave, and carrier suppressed light carries millimeter wave.Double-side band light wherein carries the influence that millimeter wave receives optical fiber dispersion, and signal power is with the increase periodic damping of transmission range; Monolateral band light carries a millimeter wave energy and overcomes the optical fiber dispersion influence, but receiving sensitivity is lower.In addition, producing list/double-side band light, to carry the frequency efficiency of millimeter wave low, and all requirement provides with light and carries the modulation signal that the repetition rate of millimeter wave equates.Comparatively speaking, carrier suppressed light carries millimeter wave, and then not only receiving sensitivity is high, and the frequency modulating signal that needs also is merely light carries the millimeter wave repetition rate half.Especially load differential phase keying (DPSK) signal (that is, produced carrier suppressed-differential phase keying (DPSK) light and carried millimeter wave) on the millimeter wave through carrying, can overcome the code element wave distortion problem that chromatic dispersion causes, improved the transmission range of millimeter-wave signal at carrier suppressed light.
Literature search through to prior art is found; People such as Qingjiang Chang are at IEEE Journal of LightwaveTechnology; 26 (15): among Generation andTransmission of Optical Carrier Suppressed-Optical Differential (Quadrature) Phase-Shift Keying (OCS-OD (Q) PSK) the Signals in Radio Over Fiber Systems (" generation and the transmission of carrier suppressed-differential phase shift in the optical-fiber wireless system (four phases) keying signal ") that delivers on the 2611-2618 (" IEEE lightwave technology " 2008); Mention that the M-Z that uses bipolar electrode produces carrier suppressed-differential phase keying (DPSK) light and carries millimeter wave, and the light carrier of having realized up link is simultaneously reused and the frequency down-conversion function of up millimeter-wave signal.Yet, because the bipolar electrode M-Z modulator that adopts is based on that the carrier suppressed modulation system realizes in this system, need be on bipolar electrode M-Z modulator underarm load the subcarrier drive signal of a pair of anti-phase; And the peripheral control circuit of essential configuration complicacy is to eliminate the direct current biasing drifting problem of bipolar electrode M-Z modulator.So the electric device number that this system needs is many, the signal processing more complicated on the electric territory.On the other hand; Because this system uses the single order upper sideband to carry out Wavelength reuse; Therefore to dispose tunable optical band pass filter to leach the single order upper sideband; The scope of this optical band pass filter centre wavelength and passband must be regulated according to the variation that light carries the millimeter wave repetition rate, caused thus the base station complex structure, lack flexibility and autgmentability.In addition, the centered carrier of higher-wattage is not fully utilized in this system, has caused the signal power waste.
Summary of the invention
The present invention is directed to the deficiency of above-mentioned prior art, proposed to use the optical filter of optical phase modulator and the fixed wave length of no direct current biasing just can produce carrier suppressed-differential phase keying (DPSK) light and carried the method that millimeter wave and realization up link light carrier are reused.The invention provides a kind of light carrier of realizing that carrier suppressed-differential phase keying (DPSK) light carries the generation of millimeter wave, up link and reuse the optical-fiber wireless system with the full-duplex communication of the down-conversion triple functions of up millimeter-wave signal.
In order to achieve the above object, the concrete technical scheme of the present invention's employing is following:
A kind of optical-fiber wireless system of full-duplex communication is made up of central station, base station, connects through fiber transmission link between central station and the base station.
Central station adopts baseband signal and the mixing of radio frequency sine wave signal to produce subcarrier signal; This subcarrier signal is through the continuous light wave of optical phase modulator modulated laser output; Produce light double-sideband-differential phase keying (DPSK) signal, above-mentioned light double-sideband-differential phase keying (DPSK) signal is carried out transferring to the base station through optical fiber link after the power amplification.
The base station at first uses optical filter that the single order sideband of light double-sideband-differential phase keying (DPSK) signal is separated with centered carrier; Through optical branching device the single order sideband is divided into two-way up and down: the single order sideband of setting out on a journey promptly produces carrier suppressed-differential phase keying (DPSK) light and carries millimeter wave, and its opto-electronic conversion is become descending millimeter-wave signal, and gives wireless terminal through antenna transmission; Following road single order sideband produces the reference local oscillator signal through opto-electronic conversion, and this reference local oscillator signal and up millimeter-wave signal mixing are downconverted into the uplink baseband signal with up millimeter-wave signal; Centered carrier is carried out remodulates as the light carrier of up link by the uplink baseband signal that above-mentioned down-conversion obtains, and the light signal after the remodulates sends back central station through optical fiber link and receives.
The present invention adopts optical phase modulator and optical filter to produce carrier suppressed-differential phase keying (DPSK) light and carries millimeter-wave signal.Owing to adopted light phase modulation, therefore the system's instability problem that can avoid the direct current biasing drift of light intensity modulator to cause does not effectively need complicated out control circuit, has simplified generation device that light carries millimeter wave, has reduced system cost.In the full duplex fibre-optical wireless system that the present invention proposes; Use centered carrier that the fixing optical filter of centre wavelength isolates light double-sideband-differential phase keying (DPSK) signal to carry out remodulates as the light carrier of up link in the base station; The frequency range of optical filter need not carried out tuning according to frequency modulating signal; Therefore the structure of base station simple and flexible more, the autgmentability of base station is stronger.In addition; All signal powers of system all are fully utilized; Carry out remodulates owing to adopt in light double-sideband-differential phase keying (DPSK) signal than the centered carrier of large-signal power as the light carrier of up link, therefore, the base station need not add optical amplification device up light carrier is amplified; The structure of base station is compact more, is easy to integrated.
Description of drawings
Fig. 1 is a central station sketch map of the present invention
Fig. 2 is a base station of the present invention sketch map
Fig. 3 is connected sketch map for central station of the present invention with the base station
Embodiment
Describe embodiment of the present invention in detail below in conjunction with accompanying drawing.
Full duplex fibre-optical wireless system of the present invention is made up of central station, base station, connects through fiber transmission link between central station and the base station.
As shown in Figure 1, each parts and the function declaration of full duplex fibre-optical wireless system central station of the present invention are following: electric frequency mixer is used for mixing bipolarity non-return-to-zero baseband signal and radio frequency sine wave signal to produce subcarrier signal; Electric amplifier is used to amplify the signal power of subcarrier signal; Laser is used to produce the light carrier of specified wavelength, can be DFB-LD; Polarization Controller is used to regulate the polarization state of laser output light carrier; Optical phase modulator is used to produce light double-sideband-differential phase keying (DPSK) signal; Optoelectronic receiver is used for the light signal of receiving uplink; Optical circulator is used for the light double-sideband-differential phase keying (DPSK) signal of downlink transfer is sent to optical fiber, also receives the light signal from up link simultaneously, and sends in the up link photoelectricity receiver of central station.
The concrete connected mode of each parts of described central station is: the output of laser and the input of Polarization Controller are with linking to each other; The output of Polarization Controller links to each other with the input of optical phase modulator; Two inputs of electricity frequency mixer are imported bipolarity non-return-to-zero baseband signal and radio frequency sine wave signal respectively, and the output of electric frequency mixer then links to each other with the input of electric amplifier.The output of electric amplifier links to each other with the RF signal input end of optical phase modulator.The output of optical phase modulator is connected with the input of optical filter.The course of work of said central station is: the light carrier of laser output is gone into optical phase modulator through the Polarization Control of Polarization Controller is laggard; Bipolarity non-return-to-zero baseband signal and radio frequency sine wave signal produce subcarrier signal through electric frequency mixer mixing; The prevention at radio-frequency port that is input to optical phase modulator after this subcarrier signal amplifies through electric amplifier drives optical phase modulator, produces light double-sideband-differential phase keying (DPSK) signal; Described light double-sideband-differential phase keying (DPSK) signal passes through Optical Fiber Transmission to the base station after through optical circulator again.
The base station of full duplex fibre-optical wireless system of the present invention is as shown in Figure 2; Each parts and function declaration are following: optical circulator is given optical filter with the light double-sideband-differential phase keying (DPSK) signal forwarding after Optical Fiber Transmission, also uplink optical signal is transmitted to Transmission Fibers to send back central station simultaneously; Optical filter; The centered carrier and the single order sideband that are used for separated light double-side band-differential phase keying (DPSK) signal; Can adopt optical circulator+bragg grating to realize; The centre wavelength of this bragg grating is fixed, and also can adopt the optical interleaver of the fixing dual input output of centre wavelength; Single order sideband after optical branching device will separate is divided into up two-way; The 1 bit time delay interferometer single order sideband (be carrier suppressed-differential phase keying (DPSK) light and carry millimeter wave) of will setting out on a journey converts carrier suppressed-amplitude shift keying light to and carries millimeter wave; Photodetector carries millimeter wave with carrier suppressed-amplitude shift keying light and converts descending millimeter-wave signal to; Photodetector will descend road single order sideband opto-electronic conversion to become the reference local oscillator signal; The electricity frequency mixer is with up millimeter-wave signal and reference local oscillator signal mixing, and what make up millimeter-wave signal is downconverted into the uplink baseband signal; Radio-frequency antenna sends the descending millimeter-wave signal of photodetector output, receives the up millimeter-wave signal of wireless terminal simultaneously; The electric light intensity modulator is modulated to the uplink baseband signal that up millimeter-wave signal down-conversion produces on the centered carrier.
The course of work of concrete connected mode of each parts of described base station and base station is: optical filter has two output ports; The output of one of them output port from the light of central station bilateral-centered carrier of differential phase keying (DPSK) signal, link to each other with the electric light intensity modulator.Another output port output light of optical filter is bilateral-the single order sideband of differential phase keying (DPSK) signal, is connected two-way about optical branching device further is divided into the single order sideband with optical branching device.Optical splitter also has two output ports; The one of which output links to each other with 1 bit time delay interferometer, converts carrier suppressed-amplitude shift keying light to and carries millimeter wave through the 1 bit time delay interferometer single order sideband (be carrier suppressed-differential phase keying (DPSK) light and carry millimeter wave) of will setting out on a journey.1 bit time delay interferometer output links to each other with photodetector, carrier suppressed-amplitude shift keying light is carried millimeter wave convert descending millimeter-wave signal to.Photodetector can be PIN photodiode.The photodetector output links to each other with electric amplifier, and descending millimeter-wave signal is amplified.The output of electric amplifier links to each other with radio-frequency antenna, converts descending millimeter-wave signal to radio wave through radio-frequency antenna and sends.The another one output port of optical branching device directly is connected with photodetector, will descend road single order sideband to convert the reference local oscillator signal to through photodetector.Two inputs of electricity frequency mixer then connect the output and the radio-frequency antenna of photodetector respectively.The reference local oscillator signal is downconverted into the uplink baseband signal through the up millimeter-wave signal mixing that electric frequency mixer and radio-frequency antenna receive with up millimeter-wave signal, through the output port output of electric frequency mixer.The rf inputs mouth of light intensity modulator is connected with the output port of electric frequency mixer, and the uplink baseband signal that produces after the down-conversion is modulated on the centered carrier of optical filter output through the electric light intensity modulator.The output port of light intensity modulator links to each other with optical circulator, and the centered carrier that will load the uplink baseband signal through optical circulator is forwarded in the Transmission Fibers, sends back central station through optical fiber and receives.
It is as shown in Figure 3 that full duplex fibre-optical wireless system central station of the present invention and base station concrete is connected, and an end of optical fiber link connects the port of the optical circulator of central station, and an other end of optical fiber link connects the port of the optical circulator of base station.Optical fiber link adopts standard single-mode fiber SMF-28.
Claims (4)
1. the optical-fiber wireless system of a full-duplex communication is made up of central station, base station, connects through fiber transmission link between central station and the base station, it is characterized in that:
A) said central station; Adopt baseband signal and the mixing of radio frequency sine wave signal to produce subcarrier signal; Described subcarrier signal produces light double-sideband differential phase keying (DPSK) signal through the continuous light wave of optical phase modulator modulated laser output, and described light double-sideband differential phase keying (DPSK) signal carries out transferring to the base station through optical fiber link after the power amplification;
B) said base station adopts optical filter that the single order sideband of described light double-sideband differential phase keying (DPSK) signal is separated with centered carrier, through optical branching device described single order sideband is divided into two-way up and down again;
The described single order sideband of setting out on a journey is carrier suppressed-differential phase keying (DPSK) light and carries millimeter wave; Convert it to carrier suppressed-amplitude shift keying light through one 1 bit time delay interferometer and carry millimeter wave; Said carrier suppressed-amplitude shift keying light carries millimeter wave to carry out opto-electronic conversion through photodetector and becomes descending millimeter-wave signal, and said descending millimeter-wave signal is given wireless terminal through antenna transmission;
Described road single order sideband down directly carries out opto-electronic conversion through photodetector and produces the reference local oscillator signal, and said reference local oscillator signal is downconverted into the uplink baseband signal through electric frequency mixer and up millimeter-wave signal mixing with said up millimeter-wave signal;
Described centered carrier is input to light intensity modulator as the light carrier of up link, and the uplink baseband signal that is obtained by said down-conversion carries out remodulates, and the light signal after the said remodulates sends back central station through optical fiber link and receives.
2. the optical-fiber wireless system of a kind of full worker's communication according to claim 1 is characterized in that described baseband signal is a bipolarity non-return-to-zero signal.
3. the optical-fiber wireless system of a kind of full-duplex communication according to claim 1; It is characterized in that described optical filter can adopt the optical interleaver of two output ports to realize; From optical interleaver odd number end output be the single order sideband, the output of even number end be centered carrier.
4. the optical-fiber wireless system of a kind of full-duplex communication according to claim 1; It is characterized in that described optical filter can adopt circulator to combine bragg grating to realize; What transmit in the bragg grating is the single order sideband, and what the circulator end was exported is centered carrier.
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| CN101951295B (en) * | 2010-09-09 | 2013-01-23 | 北京交通大学 | Millimeter wave (MMW) generator on basis of generating photocarrier SSB by phase shift method |
| CN102546016B (en) * | 2010-12-13 | 2015-04-22 | 湖南大学 | Radio-on-fiber communication system based on differential phase shift keying format |
| CN102195656B (en) * | 2011-03-25 | 2015-01-07 | 华为技术有限公司 | Active optical antenna, microwave transmission system and method for transmitting information |
| CN102842017B (en) * | 2012-07-10 | 2015-10-28 | 深圳市捷顺科技实业股份有限公司 | A kind of extended method of read head, device and system |
| CN105721060B (en) * | 2016-01-13 | 2018-06-15 | 北京邮电大学 | A kind of two-way multi service access ROF Transmission systems and method that carrier wave huge profit is realized using palarization multiplexing |
| CN106899355B (en) * | 2017-03-27 | 2019-04-30 | 湖南工学院 | Full light technology microwave receiving system and method |
| CN107863679B (en) * | 2017-11-27 | 2020-05-05 | 中国科学院上海光学精密机械研究所 | Frequency modulation laser signal generation device based on phase modulator |
| CN108519167B (en) * | 2018-04-16 | 2019-12-24 | 湖南工学院 | Wireless photonic temperature sensing systems and methods |
| CN108718213B (en) * | 2018-07-23 | 2023-11-24 | 华北水利水电大学 | Full duplex wired and wireless hybrid optical access system and method based on polarization multiplexing |
| CN111555812B (en) * | 2020-04-20 | 2023-03-28 | 复旦大学 | Device and system for simultaneously generating wired and wireless signals by adopting dual-polarization MZM modulator |
| CN111614405A (en) * | 2020-05-25 | 2020-09-01 | 济南浪潮高新科技投资发展有限公司 | Image rejection mixer based on double parallel phase modulators |
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