CN105846901A - High carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing - Google Patents

High carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing Download PDF

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Publication number
CN105846901A
CN105846901A CN201610139643.3A CN201610139643A CN105846901A CN 105846901 A CN105846901 A CN 105846901A CN 201610139643 A CN201610139643 A CN 201610139643A CN 105846901 A CN105846901 A CN 105846901A
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phase
spectrum vector
optical signal
signal processing
noise ratio
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CN105846901B (en
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吴锐欢
王明娥
蒋天炜
喻松
顾畹仪
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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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
    • 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
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6163—Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM]
    • 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
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
    • 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a high carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing. The system and the method comprise a tunable continuous wave laser, a phase modulator, a spectrum vector signal processor, a photoelectric diode and a radio frequency signal source. The phase modulator is used for modulating to-be-transmitted microwave signals generated by the radio frequency signal source to optical carriers generated by the tunable continuous wave laser, thus forming phase modulation optical signals. Amplitudes and phases of different optical sidebands of the phase modulation optical signals are displayed as program set specified values by using the spectrum vector signal processor according to program settings, thus forming processed modulation optical signals. Photoelectric conversion is carried out on the processed modulation optical signals by using the photoelectric diode, thus recovering the microwave signals. The microwave signals are output. According to the system and the method, the direct current drifting problem in the optical carrier wireless system can be eliminated; the high carrier-to-noise ratio of the system can be further improved; the system is simple in structure; and the system and the method have relatively high practical value.

Description

High carrier-to-noise ratio radio over fibre system based on spectrum vector sensor signal processing and method
Technical field
The present invention relates to light-carried wireless technical field, the high carrier-to-noise ratio light being based particularly on spectrum vector sensor signal processing carries nothing Line system and method.
Background technology
Light-carried wireless technology can be moved owing to combining fiber optic communication high bandwidth, low-loss, electromagnetism interference and radio communication The advantage of dynamic, flexible access is it is considered to be future work is a kind of good solution party of the broadband radio access network of millimere-wave band Case.In radio over fibre system, compared to traditional intensity modulated-direct detection scheme, owing to phase modulation schemes does not has The problems such as the link degradation brought because of DC shift, in recent years, phase modulation schemes has been subjected to more and more developer's Favor.It is known that phase modulated for radio frequency signal device is loaded on light carrier, owing to modulated light carrier wave has constant Envelope and cannot therefore be also needed to one transfer phase-modulation to intensity modulated by single photodiode direct detection Process.But, during phase-modulation turns intensity modulated, non-linear, inevitably to link due to Electro-optical Modulation Performance produce deleterious effects.The linearization technique scheme of existing a kind of optics side band phase skew, utilizes programmable optics Sideband manipulation technology, center light carrier wave and 2 rank optics sidebands in modulated optical signal apply specific phase offset, a side respectively Face realizes phase-modulation and turns intensity modulated, on the other hand improves the linearity of light-carried wireless link.
When describing radio over fibre system performance, carrier-to-noise ratio is an important indicator.Improve carrier-to-noise ratio on the one hand to need to carry High link gain, on the other hand, needs to reduce link noise.It is limited to the saturation current of photodiode, increases luminous power Mode improves link gain also the limit.Moreover erbium-doped fiber amplifier itself has noise coefficient, while gain improves It is more that noise can strengthen, and therefore carrier-to-noise ratio cannot improve.And the linearization technique scheme of above-mentioned optics side band phase skew Light energy utilization ratio the lowest, it is impossible in the case of the identical end of making an uproar, improve the carrier-to-noise ratio of system.
Having a kind of solution to the problems described above is to use at spectrum vector signal in light-carried wireless phase modulation system Reason technology, this technology both can realize phase-modulation and turn intensity modulated, can increase luminous energy with linearisation radio over fibre system again Amount utilization ratio, in the case of the identical end of making an uproar, improves the carrier-to-noise ratio of system further, has stronger using value.But This full spectrum vector sensor signal processing technology is not reported so far, concrete radio over fibre system vacancy especially.
Summary of the invention
(1) to solve the technical problem that
The present invention provides high carrier-to-noise ratio radio over fibre system based on spectrum vector sensor signal processing and method, existing to solve Light DC shift problem in radio systems, and the highest technical problem causing carrier-to-noise ratio low of system capacity utilization ratio.
(2) technical scheme
For solving above-mentioned technical problem, the present invention provides high carrier-to-noise ratio of based on spectrum vector sensor signal processing light-carried wireless system System and method, including:
Radio-frequency signal source is utilized to produce microwave signal to be passed；
Tunable continuous-wave laser is utilized to produce light carrier；
Utilize phase-modulator, described microwave signal to be passed is modulated described light carrier, form phase modulated light Signal；
Utilize spectrum vector sensor signal processing device, arrange according to program and described phase modulated optical signal is carried out optics sideband width Phase processor, makes the amplitude of different optics sideband and phase place be rendered as the designated value set by program, forms processed modulation light letter Number；
Utilize photodiode that described processed modulation optical signal carries out opto-electronic conversion, form photoelectric current, thus extensive Appear again microwave signal, and export.
Preferably, utilize spectrum vector sensor signal processing device that described phase modulated optical signal carries out optics sideband width to get along Reason, can be by the phase bit flipping 180 ° of 1 rank lower sideband of described phase modulated optical signal, by the center of described phase modulated optical signal The power attenuation 9.54dB of light carrier.
Further, the output port of described tunable continuous-wave laser inputs with the light of described phase-modulator Port is connected, the input port phase of the optical output port of described phase-modulator and described spectrum vector sensor signal processing device Connecting, the microwave input port of described phase-modulator is connected with the output port of described radio-frequency signal source；Described The output port of spectrum vector sensor signal processing device is connected with the light input end mouth of described photodiode.
(3) beneficial effect
Visible, in the high carrier-to-noise ratio radio over fibre system based on spectrum vector sensor signal processing of present invention proposition and method, At the phase field phase bit flipping 180 ° to 1 rank lower sideband of phase modulated optical signal, it is achieved phase-modulation turns intensity modulated, solve DC shift problem present in conventional strength modulation scheme；At amplitude domain to the center light carrier wave of phase modulated optical signal Power attenuation 9.54dB realizes the linearisation of chain-circuit system.The method that the present invention provides and the skew of traditional optics side band phase Linearization technique scheme is compared, it is possible to improve the utilization ratio of light energy further, in the case of the identical end of making an uproar, and can be very big Ground improves the carrier-to-noise ratio of chain-circuit system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below The accompanying drawing used required in is briefly described, it should be apparent that, the accompanying drawing in describing below is some realities of the present invention Execute example, to those skilled in the art, on the premise of not paying creative work, it is also possible to according to these accompanying drawings Obtain other accompanying drawing.
Fig. 1 be one of embodiment of the present invention high carrier-to-noise ratio based on spectrum vector sensor signal processing radio over fibre system preferably Example structure schematic diagram；
Fig. 2 is the phase-modulation of embodiment of the present invention high carrier-to-noise ratio based on spectrum vector sensor signal processing radio over fibre system The spectrum schematic diagram of optical signal；
Fig. 3 is the processed tune of embodiment of the present invention high carrier-to-noise ratio based on spectrum vector sensor signal processing radio over fibre system The spectrum schematic diagram of optical signal processed；
Fig. 4 is the gain improving of embodiment of the present invention high carrier-to-noise ratio based on spectrum vector sensor signal processing radio over fibre system Figure；
In Fig. 1,1, tunable continuous-wave laser, 2, phase-modulator, 3, spectrum vector sensor signal processing device, 4, photoelectricity two Pole is managed, and 5, radio-frequency signal source；In Fig. 2,2-1,2 rank lower sidebands of phase modulated optical signal, 2-2,1 rank of phase modulated optical signal Lower sideband, 2-3, the center light carrier wave of phase modulated optical signal, 2-4,1 rank upper side band of phase modulated optical signal, 2-5, phase place 2 rank upper side bands of modulation optical signal；In Fig. 3,3-1,2 rank lower sidebands of processed modulation optical signal, 3-2, processed modulation light 1 rank lower sideband of signal, 3-3, the center light carrier wave of processed modulation optical signal, 3-4, processed modulation optical signal 1 rank on Sideband, 3-5,2 rank upper side bands of processed modulation optical signal；In Fig. 4, the spectrum curve of 4-1 output signal of the present invention, 4-2 passes The spectrum curve of the linearization technique scheme output signal of the optics side band phase skew of system.
Detailed description of the invention
In order to make the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under not making creative work premise, broadly falls into protection scope of the present invention.
Below in conjunction with the accompanying drawings technical scheme is described in detail:
Fig. 1 is the structural representation of the present embodiment, it can be seen that include tunable continuous-wave laser 1, phase-modulation Device 2, spectrum vector sensor signal processing device 3, photodiode 4, radio-frequency signal source 5.
Described tunable continuous-wave laser 1 is used for producing light carrier, and the power of the light carrier described in order is Pi, center Angular frequency is ωc；Described radio-frequency signal source 5 is used for producing microwave signal to be passed, the angular frequency of the microwave signal to be passed described in order Rate is ω；The light input end mouth of described phase-modulator 2 is connected with the output port of described tunable continuous-wave laser 1 Connecing, the microwave input port of described phase-modulator 2 is connected with the output port of described radio-frequency signal source 5；Described Phase-modulator 2, for described microwave signal to be passed is modulated described light carrier, forms phase modulated optical signal, then phase The output light field of position modulation optical signal is represented by:
E P M ( t ) = P i e jω c t Σ n = - ∞ ∞ j n J n ( m ) e j ( n ω t ) , - - - ( 1 )
Wherein m is the modulation depth of described microwave signal to be passed, JnM () is n rank Bessel equations.Can from formula (1) Go out phase modulated optical signal output light field and there is infinite many optics sidebands, for the sake of simplicity, as in figure 2 it is shown, here only Consider its described phase modulated optical signal 2 rank lower sideband, described phase modulated optical signal 1 rank lower sideband, described phase place Modulation optical signal center light carrier wave (0 rank sideband), described phase modulated optical signal 1 rank upper side band, described phase modulated light Signal 2 rank upper side band, then the output light field of the phase modulated optical signal after simplifying is represented by:
E P M ( t ) = P i e jω c t [ - J - 2 ( m ) e - j 2 ω t - j · J - 1 ( m ) e - j ω t + J 0 ( m ) + j · J 1 ( m ) e j ω t - J 2 ( m ) e j 2 ω t ] , - - - ( 2 )
The input port of described spectrum vector sensor signal processing device 3 and the optical output port phase of described phase-modulator 2 Connecting, described spectrum vector sensor signal processing device 3 for carrying out optics sideband width phase processor, root by described phase modulated optical signal Arrange according to program and amplitude and the phase place of different optics sidebands are rendered as the designated value set by program, form processed modulation light Signal, order process after described phase modulated optical signal 1 rank upper side band, described phase modulated optical signal center light carrier wave, The transmission coefficient of described phase modulated optical signal 1 rank lower sideband is respectively a, b, c, wherein a2≤1,b2≤1,c2≤ 1, the most The output light field processing modulation optical signal is represented by；
E P M ( t ) = P i e jω c t [ - J - 2 ( m ) e - j 2 ω t - c · j · J - 1 ( m ) e - j ω t + b · J 0 ( m ) + a · j · J 1 ( m ) e j ω t - J 2 ( m ) e j 2 ω t ] , - - - ( 3 )
The output port phase of the light input end mouth of described photodiode 4 and described spectrum vector sensor signal processing device 3 Connecting, described photodiode 4, for described processed modulation optical signal carries out opto-electronic conversion, forms photoelectric current, from And recover microwave signal, and export；The responsiveness making described photodiode 4 is R；For a single frequency doubling system, we Only need fundamental frequency microwave signal to be analyzed, then the photoelectric current of photodiode 4 output is represented by I (t)=I10Cos ω t, wherein Described photoelectric current amplitude I10Determined by descending formula: I10=2RPi[aJ1(m)J2(m)+abJ0(m)J1(m)+bcJ0(m)J-1 (m)+cJ-1(m)J-2(m)], (4)
M in formula (4) is carried out 3 rank Taylor series expansions:
I 10 = RP i [ ( a b - b c ) m + 1 8 ( a - 3 a b + 3 b c - c ) m 3 ] , - - - ( 5 )
(m ＜ ＜ 1), m in formula (5) in the case of small signal approximation3Item is negligible, the most whole chain-circuit system Gain be:
G = [ πRP i ( a - c ) b V π ] 2 Z o u t Z i n , - - - ( 6 )
Wherein ZoutAnd ZinIt is respectively output impedance and input impedance, VπHalf-wave voltage for described phase-modulator 2.From Formula (5), formula (6) be not it can be seen that vacation phase modulated optical signal as mentioned is through any spectrum vector sensor signal processing (a=b =c=1), described phase modulated optical signal because there is constant envelope and cannot be by simple described photoelectricity two pole Pipe 4 is detected, now I10=0；And as transmission coefficient a=-c=1 or c=-a=1, i.e. described phase modulated optical signal 1 rank upper side band or described phase modulated optical signal 1 rank lower sideband realize phase-modulation phase field upset 180 ° and turn strong When degree modulation, the gain of whole chain-circuit system will obtain maximum.But, during phase-modulation turns intensity modulated, no Can introduce nonlinear effect in chain-circuit system with avoiding, this will greatly affect the performance of whole chain-circuit system.It is obvious that Non-linear partial in photoelectric current is with m in formula (5)3Transmission coefficient direct proportionality, therefore can be by adjusting each light The relation learned between sideband transmission coefficient greatly contains the non-linear of chain-circuit system, as long as they can meet:
A-3ab+3bc-c=0, (7)
While linearisation chain-circuit system, the gain of chain-circuit system to be ensured maximizes, i.e. meet a=-c=1 or Person c=-a=1；Preferably, as it is shown on figure 3, the spectrum vector sensor signal processing device 3 described in Li Yonging is by described phase modulated optical signal The phase bit flipping 180 ° of 1 rank lower sideband, i.e. meet a=-c=1, c=1/3 can be obtained, i.e. at amplitude domain, center light is carried The amplitude attenuation of ripple is original 1/3.Spectrum vector sensor signal processing device 3 described in utilization can be by described phase modulated optical signal The satisfied condition of having descended of the power of center light carrier wave:
10 lg ( 1 c ) 2 = 9.54 , - - - ( 8 )
As it is shown on figure 3, by the power attenuation 9.54dB of the center light carrier wave of described phase modulated optical signal.It addition, it is traditional Optics side band phase skew linearization technique scheme be respectively at center light carrier wave and the 2 rank optics of phase modulated optical signal Sideband applies the phase offset that angle is θ and β.As sin (θ)=1/3 and sin (β)=-1, fundamental frequency signal gain can be realized Bigization and non-linear minimisation.But, this by change optics side band phase realize system linearization technical scheme, not The mean power of output optical signal can be changed.When the optical signal of identical power is injected into photodiode, the present invention and biography The linearization technique scheme gain of the optics side band phase skew of system is compared,
G I = [ 9 J 0 ( m ) 2 + 18 J 1 ( m ) 2 + 9 J 2 ( m ) 2 J 0 ( m ) 2 + 18 J 1 ( m ) 2 + 9 J 2 ( m ) 2 ] 2 , - - - ( 9 )
In the case of small signal approximation, knowable to formula (9), the present invention is more linear than traditional optics side band phase skew Change technical scheme gain and improve about 19.08dB.Preferably, the radio-frequency signal source 5 described in utilization produces to be passed for 18GHz of frequency Microwave signal, utilizes phase-modulator 2 that the microwave signal to be passed that described frequency is 18GHz is modulated described tunable company On the light carrier that continuous wave laser 1 produces, utilizing method provided by the present invention, as shown in Figure 4, the embodiment of the present invention is based on light The linearisation skill of the optics side band phase skew that the ratio of gains of high carrier-to-noise ratio radio over fibre system of spectrum vector sensor signal processing is traditional Art scheme gain improves 19dB, this with above-mentioned analysis result very close to.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used So that the technical scheme described in previous embodiment to be modified, or wherein portion of techniques feature is carried out equivalent；And These amendments or replacement, do not make the essence of appropriate technical solution depart from spirit and the model of embodiment of the present invention technical scheme Enclose.

Claims (3)

1. high carrier-to-noise ratio radio over fibre system based on spectrum vector sensor signal processing and method, it is characterised in that including:
Radio-frequency signal source is utilized to produce microwave signal to be passed；
Tunable continuous-wave laser is utilized to produce light carrier；
Utilize phase-modulator, described microwave signal to be passed is modulated described light carrier, form phase modulated optical signal；
Utilize spectrum vector sensor signal processing device, arrange according to program and described phase modulated optical signal is carried out optics sideband width get along Reason, makes the amplitude of different optics sideband and phase place be rendered as the designated value set by program, forms processed modulation optical signal；
Utilize photodiode that described processed modulation optical signal carries out opto-electronic conversion, form photoelectric current, thus recover Microwave signal, and export.
2. high carrier-to-noise ratio radio over fibre system based on spectrum vector sensor signal processing as claimed in claim 1 and method, it is special Levy and be: the output port of described tunable continuous-wave laser is connected with the light input end mouth of described phase-modulator Connecing, the optical output port of described phase-modulator is connected with the input port of described spectrum vector sensor signal processing device, institute The microwave input port of the phase-modulator stated is connected with the output port of described radio-frequency signal source；Described spectrum vector The output port of signal processor is connected with the light input end mouth of described photodiode.
3. high carrier-to-noise ratio radio over fibre system based on spectrum vector sensor signal processing as claimed in claim 1 and method, it is special Levy and be: utilize spectrum vector sensor signal processing device that described phase modulated optical signal carries out optics sideband width phase processor, can be by institute State the phase bit flipping 180 ° of 1 rank lower sideband of phase modulated optical signal, by the center light carrier wave of described phase modulated optical signal Power attenuation 9.54dB.
CN201610139643.3A 2016-03-11 2016-03-11 A kind of method that high carrier-to-noise ratio light-carried wireless link is realized based on spectrum vector sensor signal processing technology Active CN105846901B (en)

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US20070189343A1 (en) * 2006-02-14 2007-08-16 Wolf Seelert White light solid-state laser source with adjustable RGB output
CN103235374A (en) * 2013-04-15 2013-08-07 华中科技大学 Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter
CN104272538A (en) * 2012-03-27 2015-01-07 光电波股份有限公司 Tunable opto-electronic oscillator having optical resonator filter operating at selected modulation sideband
US20150200727A1 (en) * 2010-07-01 2015-07-16 Montana State University Techniques for single sideband suppressed carrier (ssbsc) optical signals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070189343A1 (en) * 2006-02-14 2007-08-16 Wolf Seelert White light solid-state laser source with adjustable RGB output
US20150200727A1 (en) * 2010-07-01 2015-07-16 Montana State University Techniques for single sideband suppressed carrier (ssbsc) optical signals
CN104272538A (en) * 2012-03-27 2015-01-07 光电波股份有限公司 Tunable opto-electronic oscillator having optical resonator filter operating at selected modulation sideband
CN103235374A (en) * 2013-04-15 2013-08-07 华中科技大学 Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter

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