CN106533567A - Method for simultaneously realizing dispersion compensation and high-signal gain based on optical and frequency spectrum processing in distributed radio-over-fiber communication system - Google Patents
Method for simultaneously realizing dispersion compensation and high-signal gain based on optical and frequency spectrum processing in distributed radio-over-fiber communication system Download PDFInfo
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- CN106533567A CN106533567A CN201611055284.XA CN201611055284A CN106533567A CN 106533567 A CN106533567 A CN 106533567A CN 201611055284 A CN201611055284 A CN 201611055284A CN 106533567 A CN106533567 A CN 106533567A
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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
- H04B10/25—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
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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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
- H04B10/5161—Combination of different modulation schemes
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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
- 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
- H04B10/548—Phase or frequency modulation
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a method for simultaneously realizing dispersion compensation and high-signal gain based on optical and frequency spectrum processing in a distributed radio-over-fiber communication system. The method comprises the following steps of injecting laser into a phase modulator and uploading a radio frequency signal in the distributed radio-over-fiber communication system for small signal modulation; outputting a photonic signal by the phase modulator and enabling the photonic signal to pass through an optical signal processor; carrying out phase pre-distortion for each sideband of the photonic signal and suppressing an optical carrier sideband by the processor; amplifying an output optical signal by an erbium-doped optical fiber amplifier, wherein the gain of the optical fiber amplifier is equal to the suppression power of the optical processor for the optical carrier sideband; and distributing the output signal to a suitable optical fiber link after the output signal passes through a 1:N optical power divider and an optical switch, transmitting the output signal through an optical fiber, and detecting and demodulating the output signal by a photoelectric detector in a far-end access point. Therefore, the problems of dispersion compensation and low gain of the communication system are solved efficiently.
Description
Technical field
The present invention relates to a kind of method for realizing dispersion compensation and high RST gain based on optical spectrum process, the method simultaneously
Can be used in distributed radio over fibre system.
Background technology
With forth generation mobile communication it is commercial on a large scale, LTE network experiencing from extensively cover to depth cover, from underloading
Net to heavy duty net great change, network structure and O＆M it is increasingly sophisticated, be faced with (500～1000 times of flow explosive growth
Increase), depth cover, the series of challenges such as high frequency networking wall penetration loss and addressing and constructional difficulties, to base station flexible deployment
It is more urgent with the simple demand safeguarded.At present, from terms of the practice of domestic and overseas operators, the miniaturization of base station, intellectuality, low work(
Consumption becomes important trend.So, the distributed light for having merged PicoCell, MicroCell and Small Cell technologies carries nothing
Line communication technology arises at the historic moment, and it becomes two-forty, wide bandwidth, low-power consumption, full intelligence, the wide weight for covering 4G and 5G access networks
Solution is wanted, and very important role is play in 4G and lower 5G communications.
Light carrier radio communication system with spaced antenna, is efficiently melting for optical fiber telecommunications system and wireless communication system
Close.Technically, it is split into baseband processing unit and Remote Radio Unit traditional macro base station, carries out signal by optical fiber
Feeding.Centralized baseband processing unit, can effectively realize base station miniaturization, and reduce base station power consumption and exploitation and tie up
Shield cost, and distributed Remote Radio Unit can improve wireless coverage, realize seamless access.With traditional radio communication
System is compared, and the advantages of the low-loss of the system energy efficient utilization fiber-optic transfer and wide bandwidth, also inherits tradition well
The advantages of control motility and wireless coverage in wireless communication system.But, simultaneously, as the communication system is utilized
Optical fiber carries out Wideband signal transmission, so the power dissipation problems caused by dispersion, become one of and restrict its systematic function
Key issue.Further, since substantial amounts of radio-frequency power (～45dB) can be lost in modulation and demodulating process, so low gain
Also a major issue for restricting the system, the signal to noise ratio of its serious system for restricting are become.
Dispersion compensation and high RST gain are how realized in distributed light carrier radio communication system, becomes important
Art problem.In recent years, realized that the method for high link gain was reported with local oscillation power manipulation, Sagnac rings, and mended with dispersion
Repay optical fiber, predistortion, bipolar electrode intensity modulator, the method for double flat weighing apparatus intensity modulator and optical phase conjugation is compensating dispersion
Method realize.However, local oscillation power manipulation method and Sagnac is around-France is required for extra local vibration source.Dispersion compensating fiber
Method, pre-distortion method and optical phase conjugation method are all poorly suitable in broadband signal, bipolar electrode intensity modulator method and double flat
Weighing apparatus bipolar electrode intensity modulator rule needs the problems such as solving the null offset of bias.
The content of the invention
It is an object of the invention to provide a kind of process based on optical spectrum realizes dispersion compensation and high RST gain simultaneously
Method.The method can be used for the light carrier radio communication system with spaced antenna.
According to the present invention, there is provided a kind of side that dispersion compensation and high RST gain are realized based on optical spectrum process simultaneously
Method.In the distributed light carrier radio communication system of small signal modulation, laser is injected in phase-modulator and radio frequency is loaded
Signal.Phase-modulator output photon signal, and through OSP.The processor enters to each sideband of photon signal
Line phase predistortion, and light carrier sideband is suppressed.Phase predistortion to each sideband pre-operation, can compensated optical signal
The phase shift in different optical sidebands caused by dispersion when transmitting in a fiber, so as to finally compensate dispersion.And light carrier is carried out
Suppress, then amplify optical signal with fiber amplifier, when the gain of fiber amplifier is equal to carrier wave suppresses power, the work(of carrier wave
Rate can be it often fully compensated, but positive and negative single order sideband is exaggerated, therefore, the signal gain of system can be enhanced.So as to the communication
The dispersion compensation and low gain problem of system can be by effectively solving.
Description of the drawings
By the description to embodiment for carrying out below in conjunction with the accompanying drawings, the above-mentioned and/or other objects and advantages of the present invention
Will become apparent, wherein：
Fig. 1 illustrates system architecture diagram
Fig. 2 illustrates spectrum amplitude and phase place change figure of each sideband of optical signal in this programme.
Fig. 3 illustrates system dispersion improvement figure
Fig. 4 illustrates system gain improvement figure
Fig. 5 illustrates system SFDR improvement figure
Specific embodiment
Embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
Describe in Fig. 1 based on optical spectrum process while realizing the general system set-up of dispersion compensation and high RST gain
Figure, wherein S101 are centralized base station, and S102 is Wavelength tunable laser, light carrier export from S102 after through S103 phases
Position manipulator.Meanwhile, RF signal S 104 is loaded on the electrode of S103 phase-modulators, carrys out modulated optical carrier.Modulated
, through S105 OSPs, the processor is by S106 circulators, S107 gratings, S108 lens and S109 silicon substrates for optical signal
Liquid crystal is constituted.The processor carries out phase predistortion to the carrier wave and positive and negative single order sideband of photon signal, and to light carrier
Sideband is suppressed.Thereafter, export optical signal to be amplified by S110 fiber amplifiers, the gain of fiber amplifier is equal to optical processor
Suppression power to light carrier sideband.Its output signal is through S111 1：N optical power distributors and S112 photoswitches (are polarized by S113
Controller and S114 analyzers composition) after be assigned on suitable optical fiber link, through S115 fiber-optic transfer by S116 distal ends
The detection of S117 photodetectors and demodulation in access point.
The theory analysis of system is as follows：Light carrier through S103 phase-modulators by the expression formula after S104 rf modulations such as
Under：
Wherein PinIt is optical output power of laser, ωoIt is light carrier angular frequency, ω1It is radiofrequency signal angular frequency, m=π Vm/
VπIt is rf-signal modulation depth, VmIt is the amplitude of radiofrequency signal, VπIt is the half-wave voltage of S103 phase-modulators.Thereafter, adjusted
The optical signal of system carries out phase to the carrier wave and positive and negative single order sideband of photon signal through S105 OSPs, the processor
Position predistortion, and light carrier sideband is suppressed.(the m in the case of small signal modulation<0.05), second order optical sideband and
High-order optical sideband is minimum due to its signal power, can be ignored and disregard.So, the expression of the optical signal of phase-modulator output
Formula is：
Wherein, α is the power attenuation coefficient of light carrier sideband, and β and γ is on light carrier sideband and light single order sideband respectively
Light phase predistortion.Thereafter, export optical signal to be amplified by fiber amplifier, the gain of fiber amplifier is equal to optical processor pair
The suppression power of light carrier sideband.Its output signal is through 1：N optical power distributors and photoswitch are (by Polarization Controller and analyzer group
Into) after be assigned on suitable optical fiber link, after fiber-optic transfer, the expression formula of the optical signal of output is：
Wherein,For link total-power loss, G is fiber amplifier gain,AndFor dispersion cause
The phase shift that light carrier sideband, single order upper side band and single order lower sideband cause.When the phase place on each sideband is identical, dispersion causes
Power fading phenomenon will not work.Now, whenWhen, link dispersion
Can be it often fully compensated.At this moment,Thereafter, connect from the optical signal of optical fiber output by distal end
Photodetector in access point is detected and demodulates, and the signal of telecommunication after its demodulation can be expressed as：
Wherein, response efficiencies of the R for photodetector.In addition, the signal gain of the system isWherein ZoutFor the matching impedance of output signal,For input radio frequency
The input power of signal.And the signal gain of the double sideband modulation and single sideband modulation communication system of non-dispersive compensation isWithSo, three systems
Gain contrast is as follows：
Gour:GDSB:GSSB=4G2α:4:1
From above formula, signal gain can be enhanced, and work as G2＞ α.Therefore, the distributed light-carried wireless advocated by we leads to
Letter system can realize dispersion compensation and high RST gain.
Fig. 2 is the spectrum amplitude and phase place change figure for illustrating each sideband of optical signal in this programme.Fig. 2 (a) is given
The amplitude and phase frequency spectrum figure of the optical signal of S103 phase-modulators output；Fig. 2 (b) provides the light letter of S105 optical processors output
Number amplitude and phase frequency spectrum figure, it is evident that phase predistortion angle [alpha] has been loaded on carrier wave sideband and single order sideband with β,
And carrier wave sideband power is also inhibited；Fig. 2 (c) provides the optical signal of S115 optical fiber outputs, now, total phase place of all sidebands
It is equal, so from theory analysis above, the dispersion of system is compensated very well.
Fig. 3 illustrates system dispersion improvement figure.The frequency response of communication system that contrast double-side band is uncompensated is (with band round dot in figure
Straight line represent), communication system that we are advocated (in figure with represent with little foursquare straight line) tends on the frequency response
It is flat, do not affected by dispersion substantially；With the frequency response of the uncompensated communication system of single-side belt (with the straight line table with rhombus in figure
Show), the communication system advocated by we has very high signal gain.
Fig. 4 illustrates system gain improvement figure.Under same experiment condition, system that we are advocated, double-side band communication
The detectable signal of system and Single Sideband Communications System is respectively -27.26dB, -37.85dB and -42.42dB.Due to us
The high RST gain of link, the gain of link are compared other two communication systems and have been respectively increased 10.59dB and 15.16dB.
Fig. 5 illustrates system SFDR improvement figure.Due to the reason that dispersion compensation and link gain are improved.I
The communication system advocated be respectively increased than the SFDR of double-side band communication system and Single Sideband Communications System
15.86dB and 25.34dB.
Claims (7)
1. processed based on optical spectrum in distributed light carrier radio communication system and realize dispersion compensation and high RST gain method simultaneously,
The method is comprised the following steps：
In the distributed light carrier radio communication system of small signal modulation, laser is injected in phase-modulator and radio frequency is loaded
Signal.Phase-modulator output photon signal, and through OSP.The processor is carried out to each sideband of optical signal
Phase predistortion, and light carrier sideband is suppressed.Output optical signal is incorporated doped fiber amplifier amplification, fiber amplifier
Gain be equal to suppression power of the optical processor to light carrier sideband.Its output signal is through 1：After N optical power distributors and photoswitch
It is assigned on suitable optical fiber link, through fiber-optic transfer by the photodetector detection and demodulation in distance connection point.
2. the method for claim 1, small signal modulation require that the modulation of the radiofrequency signal loaded on phase-modulator refers to
Number is not more than 0.05.So directly from the sideband of the photon signal of phase-modulator output, only carrier wave and positive and negative single order side
Band needs to consider that other sidebands can be ignored.
3. the method for claim 1, OSP require possess to enter photon signal frequency domain amplitude and phase place
The function of row manipulation.
4. the method for claim 1, the phase compensation numerical value of predistortion will according to the abbe number of optical fiber link with
And fiber lengths are directly calculated.
5. the method for claim 1, when the phase place that phase place and the photon signal of predistortion are introduced due to fibre-optical dispersion
When just contrary, the dispersion distortion of communication system can be fully compensated for.
6. the method for claim 1, when the gain of fiber amplifier is equal to suppression of the optical processor to light carrier sideband
During power, the gain of detectable signal can be improved.
7. the method for claim 1, the method energy effectively solving have the light carrier radio communication system of spaced antenna
Dispersion compensation and the problems such as low signal gain.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082873A (en) * | 2019-12-17 | 2020-04-28 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
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Cited By (2)
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| CN111082873A (en) * | 2019-12-17 | 2020-04-28 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
| CN111082873B (en) * | 2019-12-17 | 2022-02-11 | 北京邮电大学 | Ultra-long-distance optical fiber high-precision radio frequency signal transmission system and method |
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