CN102324976A - Broadband radio frequency remote optical transmission link and transmission method thereof - Google Patents
Broadband radio frequency remote optical transmission link and transmission method thereof Download PDFInfo
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- CN102324976A CN102324976A CN201110244081A CN201110244081A CN102324976A CN 102324976 A CN102324976 A CN 102324976A CN 201110244081 A CN201110244081 A CN 201110244081A CN 201110244081 A CN201110244081 A CN 201110244081A CN 102324976 A CN102324976 A CN 102324976A
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Abstract
The invention discloses a broadband radio frequency remote optical transmission link and a transmission method thereof, relating to the microwave photon simulation optical link transmission technology field. The link comprises the following parts: an electric light polarization modulator used for carrying out anti-phase phase modulation on a broadband radiofrequency signal to two carrier wave optical signals of a main shaft and a quadrature shaft and outputting the two carrier wave optical signals to a polarization analyzer; the polarization analyzer used for outputting a modulation optical signal setting a polarization direction; a detector used for demodulating an input modulation optical signal, realizing direct noncoherent synthesis of power, and recovering broadband radio frequency information loaded on the modulation optical signal. The transmission link and the method in the invention have the characteristics of realization of broadband dispersion compensation, simple link structure, low cost and easy adjusting control.
Description
Technical field
The present invention relates to microwave photon analog optical link transmission technique field, relate in particular to a kind of wide band radio-frequency and zoom out optical transmission chain and transmission method.
Background technology
Optical fiber link has widely in Fiber to the home network, antenna far-end and light-carried wireless system to be used.Compare with traditional coaxial cable; It is little that Optical Fiber Transmission has a volume, light weight, and bandwidth, message capacity are big; Security performance is high; And multiple advantage such as anti-electromagnetic interference, therefore radiofrequency signal is carried on the light carrier, the transmission that utilizes optical fiber to carry out signal become present communication network and following multimedia communication use in the most important mode of intelligence transmission.But the effect of dispersion of optical fiber link can cause signal power decline, and especially at working frequency range during to high-frequency microwave or even millimere-wave band expansion and long Distance Transmission, chromatic dispersion has aggravated the bandwidth constraints of analog optical link especially.How realize in broadband range that the dispersion compensation and the high-quality of signal grow Distance Transmission and become one of key issue that following wide band long distance message transmission need solve.
As shown in Figure 1 is disclosed dispersion compensation link schematic diagram in the U.S. Pat 6122086.The chromatic dispersion transmission characteristic of the complementation that this dispersion compensation link mainly causes radio signal transmission based on parallel phase-modulator and intensity modulator.What the optical signals beam splitter 23 that lasing light emitter (LD) 1 produces was divided into that two bundles are injected into two arms up and down respectively is used for intensity modulator 3 and phase-modulator 5.The microwave signal that receives from antenna 7 simultaneously is divided into two-way drive strength modulator 3 and phase-modulator 5 respectively through microwave merit separation structure 17.Signal after the modulation passes through polarization maintaining optical fibre 9 backs respectively and is outputed in monomode fiber (SMF) 15 links by polarization beam combiner (PBS) 11 couplings; And two signals are the linearly polarized light of polarization direction quadrature, thereby realize the incoherent synthetic of probe power at the detector 25 of receiving terminal.Relevant and the amplitude response of two chromatic dispersions becomes the signal of complementary relationship to carry out the power stack, eliminated the influence of the signal power decline that chromatic dispersion brings, and realized the dispersion compensation of radio signal transmission.
The characteristics of above-mentioned dispersion compensation link are that general structure is simple, make that based on parallel modulator block and polarization beam combiner two signal polarization directions keep orthogonality relation in the link, have realized the incoherent synthetic and dispersion compensation of power after the last detector end demodulation.But the shortcoming that this scheme exists comprises:
1. cost is higher.Need two parallel modulators to realize phase modulated and intensity modulated.
2. compensation limited bandwidth.The microwave signal that receives need be divided into two-way through microwave merit separation structure and drive two modulators, since the restriction of microwave merit separation structure bandwidth, the compensation limited bandwidth of whole Dispersion Compensation Systems.
3. because phase-modulator and the design of intensity modulator various structure; The difference of its half-wave voltage and the luminous power of bearing, microwave power; Realize that power fading effect and frequency response that two paths of signals chromatic dispersion up and down causes become the strictly complementary relation, the adjustment calibration of whole system will be more complicated.
Therefore, be necessary to design a kind of simple in structure, low-cost and be prone to the broadband chromatic dispersion compensation optical link of adjustment control, realize the fiber optic stretch transmission of radiofrequency signal.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: provide a kind of dispersion compensation in broadband, wide band radio-frequency simple in structure, that cost is lower and easy adjustment is controlled can realized to zoom out optical transmission chain and transmission method.
(2) technical scheme
For addressing the above problem; The invention provides a kind of wide band radio-frequency and zoom out optical transmission chain; It is characterized in that; This link comprises: the electric light polar modulator, be used for the two-way carrier wave light signal of broadband rf signal anti-phase ground phase modulated, and output two-way modulated light signal is to analyzer to its main shaft and normal axis; Analyzer is used to export the modulated light signal of setting the polarization direction; Detector is used for the modulated light signal that demodulation is imported, and realizes the direct incoherent synthetic of power, recovers the wide band radio-frequency information that loads on the said modulated light signal.
Preferably, this link also comprises: light source module is used to launch carrier wave light signal to the Polarization Control module of two-way power match; The Polarization Control module; Be used for polarization direction with the two-way carrier wave light signal of said light source module emission and be adjusted into respectively to become 45 with the main shaft of said electric light polar modulator and be complementary, and export said electric light polar modulator to the primary optical axis of said electric light polar modulator.
Preferably, said light source module further comprises: lasing light emitter is used to launch one tunnel polarization state carrier wave light signal arbitrarily; Optical coupler is used for one road carrier wave light signal of said lasing light emitter emission is divided into the two-way of power match, and exports said Polarization Control module to.
Preferably; Said Polarization Control module further comprises: first Polarization Controller; Be used for polarization direction with one road carrier wave light signal of said light source module output and be adjusted into the main shaft of said electric light polar modulator and become 45, and export said electric light polar modulator to; Second Polarization Controller is used for polarization direction with another road carrier wave light signal of said light source module output and is adjusted into the main shaft coupling with said electric light polar modulator, and exports said electric light polar modulator to.
Preferably, this link also comprises: protect the polarisation coupler, be arranged between said Polarization Control module and the said electric light polar modulator, be used for the two-way carrier wave light signal guarantor of said Polarization Control module output is coupled into said electric light polar modulator partially.
Preferably; This link also comprises: the 3rd Polarization Controller; Be arranged between said electric light polar modulator and the said analyzer, be used to guarantee that the polarization direction of modulated light signal of said electric light polar modulator output is consistent with the light polarization direction of the said analyzer of injection.
The present invention also provides a kind of wide band radio-frequency to zoom out optical transmission method, and the method comprising the steps of:
S1. two-way carrier wave light signal is inputed to the electric light polar modulator, the polarization direction of said two-way carrier wave light signal is respectively and becomes 45 with the main shaft of said electric light polar modulator and be complementary with the primary optical axis of said electric light polar modulator;
S2. to the two-way polarised light of its main shaft and normal axis, and output two-way modulated light signal is to analyzer with radiofrequency signal anti-phase ground phase modulated for the electric light polar modulator;
S3. the analyzer modulated light signal that will set the polarization direction exports detector to;
S4. the modulated light signal of detector demodulates input is realized the direct incoherent synthetic of power, exports the broadband rf signal that loads on the said modulated light signal.
Preferably, this method also comprises step:
S0 with the polarization direction of the two-way carrier wave light signal of power match be adjusted into respectively become 45 with the main shaft of said electric light polar modulator and be complementary with the primary optical axis of said electric light polar modulator after, and transport to said electric light polar modulator.
Preferably, in step S1, said two-way carrier wave light signal guarantor is coupled into said electric light polar modulator partially.
Preferably, in step S2, guarantee that the polarization direction of the modulated light signal of said electric light polar modulator output as one man exports said analyzer to the light polarization direction of injecting said analyzer.
Preferably, in step S4, according to following formula composite signal power:
Wherein, a
1And a
2For relevant constant, the λ of modulation depth with the power of the carrier wave light signal of importing said electric light polar modulator, said detector responsivity, said electric light polar modulator is the frequency of carrier wave light signal; F is said broadband rf signal frequency, and χ is total GVD.
(3) beneficial effect
The present invention has the following advantages:
1, use optical transmission chain of the present invention and optical transmission method, the compensation bandwidth only receives the influence of modulator and detector bandwidth of operation, can realize the dispersion compensation of wide bandwidth.
2, only just realized intensity modulated and phase modulated simultaneously, reduced the cost of link with a polar modulator.
3, adopt link of the present invention and method less demanding to receiving unit; Two modulated light signal polarization directions through behind the analyzer are identical; Only need a common detector can accomplish the direct incoherent synthetic of single order signal electrical power; Realize the demodulation of signal, also practiced thrift the cost that signal receives simultaneously.
4, simple in structure, cost is low, and easy operating, only needs the power-division ratios of suitable adjusting optical coupler, can realize the dispersion compensation in broadband, and signal is the decline of the signal power due to the no chromatic dispersion after the long-distance optical fiber link transmission.
Description of drawings
Fig. 1 is traditional dispersion compensation link sketch map;
Fig. 2 zooms out simulated light transmission link structured flowchart for the wide band radio-frequency according to one embodiment of the present invention;
Fig. 3 zooms out simulated light transmission link structural representation for the wide band radio-frequency according to one embodiment of the present invention;
Fig. 4 zooms out simulated light transmission method flow chart for the wide band radio-frequency according to one embodiment of the present invention.
Embodiment
The wide band radio-frequency that the present invention proposes zooms out simulated light transmission link and optical transmission method, specifies as follows in conjunction with accompanying drawing and embodiment.
Shown in Fig. 2-3; Zooming out the simulated light transmission link according to the wide band radio-frequency of one embodiment of the present invention comprises: the light source module of forming by continuous wave laser source 2 and optical coupler 4, the Polarization Control module of forming by first Polarization Controller 6 and second Polarization Controller 8, guarantor's polarisation coupler 10, electric light polar modulator 12, the 3rd Polarization Controller 14, analyzer 16, monomode fiber 18 and photodetector 20, wherein:
Continuous wave laser source 2 is used to launch the road carrier wave light signal that polarization state can be random polarization state.
Tunable optical coupler 4 is used to realize the coupling of power, the carrier wave optical signal power of lasing light emitter 2 outputs reasonably is divided into two-way, and exports the Polarization Control module to.
First Polarization Controller 6, the polarization direction that is used to adjust the carrier wave light signal of input becomes 45 with the main shaft of electric light polar modulator 12.
Electric light polar modulator 12 is restrainted the broadband rf signal anti-phase ground phase modulated that antenna receives on the polarised lights to two of its main shaft and normal axis.
The 3rd Polarization Controller 14 is positioned at after the electric light polarization modulation 12, before the analyzer 16, is used to guarantee that the modulated light signal polarization direction of electric light polar modulator 12 outputs is consistent with the light polarization direction of injection analyzer 16;
Long-range single mode fiber 18, long-distance transmissions have carried the modulated light signal of wide band radio-frequency information.
As shown in Figure 4, the wide band radio-frequency of accordinging to one embodiment of the present invention zooms out the simulated light transmission method and comprises step:
The light signal that S0 is exported lasing light emitter by tunable optical coupler is divided into two bundles; Through regulating the coupler power-division ratios; Make the power of two-way carrier wave light signal reach coupling; Through regulate the Polarization Control module with the polarization direction of the two-way carrier wave light signal of power match be adjusted into respectively become 45 with the main shaft of electric light polar modulator and be complementary with the primary optical axis of electric light polar modulator after, and transport to the electric light polar modulator.
S1. two-way carrier wave light signal is inputed to the electric light polar modulator, the polarization direction of this two-way carrier wave light signal is respectively and becomes 45 with the main shaft of electric light polar modulator and be complementary with the primary optical axis of electric light polar modulator;
S2. to the two-way polarised light of its main shaft and normal axis, and output two-way modulated light signal is to analyzer with radiofrequency signal anti-phase ground phase modulated for the electric light polar modulator;
S3. the analyzer modulated light signal that will set the polarization direction exports detector to, and the light of other direction is not exported;
Wherein, when the polarization direction of incident carrier wave light signal is when becoming 45 with the main shaft of electric light polar modulator, modulate through the inverted phases on two modulation axles of electric light polar modulator, last modulated light signal in analyzer output is the signal of intensity modulated; When incident carrier wave light signal polarisation of light direction is complementary for the main shaft with the electric light polar modulator, only there is a direction that phase modulated is arranged during through the electric light polar modulator, the modulated light signal in analyzer output is the signal of phase modulated at last.The signal of phase modulated and intensity modulated receives dispersive influence in fiber transmission link, and the power fading that causes and frequency response become complementary relationship.
S4. the modulated light signal of detector demodulates input is realized the direct incoherent synthetic of power, exports the broadband rf signal that loads on the said modulated light signal.The two identical modulated light signals of polarization direction of analyzer output have been realized the incoherent synthetic of power after the demodulation of detector end; Relevant and the amplitude response of two chromatic dispersions becomes the signal of complementary relationship to carry out the power stack, eliminated the influence of the signal power decline that chromatic dispersion brings.Suitable adjusting tunable optical coupler can guarantee two modulated light signal frequency response power match, thereby makes the approximate dispersive influence that do not receive of signal of detector output.
In step S1, the guarantor is coupled into the electric light polar modulator partially with this two-way carrier wave light signal.
In step S2, guarantee that the polarization direction of the modulated light signal of electric light polar modulator output as one man exports analyzer to the light polarization direction of injecting analyzer.
The modulated light signal of intensity modulated and phase modulated is in the dispersive influence that receives optical fiber link separately; After detector demodulates; The power fading effect that optical fiber link brings has been reflected in the correspondent frequency response and has become complementary relationship, and the single order radiofrequency signal electromotive power output that intensity modulator is relevant with phase-modulator can be represented by formula (1) and (2) respectively:
Wherein, a
1And a
2For relevant constant, the λ of modulation depth with the power of the carrier wave light signal of importing the electric light polar modulator, said detector responsivity, electric light polar modulator is the frequency of carrier wave light signal, f is the broadband rf signal frequency, and χ is total GVD.
In step S4, according to following formula composite signal power:
Suitable adjusting tunable optical coupler changes the luminous power that is input to two modulators, can make a
1=a
2Thereby, realize the radiofrequency signal long-distance optical fiber transmission that approximate chromatic dispersion is irrelevant.
Above execution mode only is used to explain the present invention, and is not limitation of the present invention.Although the present invention is specified with reference to embodiment; Those of ordinary skill in the art is to be understood that; Technical scheme of the present invention is carried out various combinations, revises or is equal to replacement; The spirit and the scope that do not break away from technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (11)
1. a wide band radio-frequency zooms out optical transmission chain, it is characterized in that, this link comprises:
The electric light polar modulator be used for the two-way carrier wave light signal of broadband rf signal anti-phase ground phase modulated to its main shaft and normal axis, and output two-way modulated light signal is to analyzer;
Analyzer is used to export the modulated light signal of setting the polarization direction;
Detector is used for the modulated light signal that demodulation is imported, and realizes the direct incoherent synthetic of power, recovers the wide band radio-frequency information that loads on the said modulated light signal.
2. wide band radio-frequency as claimed in claim 1 zooms out optical transmission chain, it is characterized in that, this link also comprises:
Light source module is used to launch carrier wave light signal to the Polarization Control module of two-way power match;
The Polarization Control module; Be used for polarization direction with the two-way carrier wave light signal of said light source module emission and be adjusted into respectively to become 45 with the main shaft of said electric light polar modulator and be complementary, and export said electric light polar modulator to the primary optical axis of said electric light polar modulator.
3. wide band radio-frequency as claimed in claim 2 zooms out optical transmission chain, it is characterized in that, said light source module further comprises:
Lasing light emitter is used to launch one tunnel polarization state carrier wave light signal arbitrarily;
Optical coupler is used for one road carrier wave light signal of said lasing light emitter emission is divided into the two-way of power match, and exports said Polarization Control module to.
4. wide band radio-frequency as claimed in claim 2 zooms out optical transmission chain, it is characterized in that, said Polarization Control module further comprises:
First Polarization Controller is used for polarization direction with one road carrier wave light signal of said light source module output and is adjusted into the main shaft of said electric light polar modulator and becomes 45, and exports said electric light polar modulator to;
Second Polarization Controller is used for polarization direction with another road carrier wave light signal of said light source module output and is adjusted into the main shaft coupling with said electric light polar modulator, and exports said electric light polar modulator to.
5. wide band radio-frequency as claimed in claim 4 zooms out optical transmission chain, it is characterized in that, this link also comprises:
Protect the polarisation coupler, be arranged between said Polarization Control module and the said electric light polar modulator, be used for the two-way carrier wave light signal guarantor of said Polarization Control module output is coupled into said electric light polar modulator partially.
6. wide band radio-frequency as claimed in claim 1 zooms out optical transmission chain, it is characterized in that, this link also comprises:
The 3rd Polarization Controller is arranged between said electric light polar modulator and the said analyzer, is used to guarantee that the polarization direction of modulated light signal of said electric light polar modulator output is consistent with the light polarization direction of the said analyzer of injection.
7. a wide band radio-frequency zooms out optical transmission method, it is characterized in that the method comprising the steps of:
S1. two-way carrier wave light signal is inputed to the electric light polar modulator, the polarization direction of said two-way carrier wave light signal is respectively and becomes 45 with the main shaft of said electric light polar modulator and be complementary with the primary optical axis of said electric light polar modulator;
S2. to the two-way polarised light of its main shaft and normal axis, and output two-way modulated light signal is to analyzer with radiofrequency signal anti-phase ground phase modulated for the electric light polar modulator;
S3. the analyzer modulated light signal that will set the polarization direction exports detector to;
S4. the modulated light signal of detector demodulates input is realized the direct incoherent synthetic of power, exports the broadband rf signal that loads on the said modulated light signal.
8. wide band radio-frequency as claimed in claim 7 zooms out optical transmission method, it is characterized in that, this method also comprises step:
S0 with the polarization direction of the two-way carrier wave light signal of power match be adjusted into respectively become 45 with the main shaft of said electric light polar modulator and be complementary with the primary optical axis of said electric light polar modulator after, and transport to said electric light polar modulator.
9. wide band radio-frequency as claimed in claim 7 zooms out optical transmission method, it is characterized in that, in step S1, said two-way carrier wave light signal guarantor is coupled into said electric light polar modulator partially.
10. wide band radio-frequency as claimed in claim 7 zooms out optical transmission method; It is characterized in that; In step S2, guarantee that the polarization direction of the modulated light signal of said electric light polar modulator output as one man exports said analyzer to the light polarization direction of injecting said analyzer.
11. wide band radio-frequency as claimed in claim 7 zooms out optical transmission method, it is characterized in that, in step S4, according to following formula composite signal power:
Wherein, a
1And a
2For relevant constant, the λ of modulation depth with the power of the carrier wave light signal of importing said electric light polar modulator, said detector responsivity, said electric light polar modulator is the frequency of carrier wave light signal; F is said broadband rf signal frequency, and χ is total GVD.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2488404A (en) * | 2011-02-16 | 2012-08-29 | Phoenix Inc 3 | Optically transporting a wideband RF signal |
| CN102904642A (en) * | 2012-10-25 | 2013-01-30 | 西南交通大学 | Wideband-simulated photon link dispersion decline compensation scheme based on intensity modulation diversity transmitter |
| CN104020334A (en) * | 2014-05-28 | 2014-09-03 | 江苏金迪电子科技有限公司 | Electro-optical phase modulator half-wave voltage measurement system and measurement method |
| CN112929088A (en) * | 2019-12-06 | 2021-06-08 | 华为技术有限公司 | Central unit, remote unit, small station system and communication method |
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| CN101110649A (en) * | 2007-06-18 | 2008-01-23 | 西安理工大学 | Wireless laser communication PPM polarization modulation and demodulation method |
| CN101510804A (en) * | 2009-03-26 | 2009-08-19 | 清华大学 | Method and apparatus for modulating and demodulating signal of optical fiber radio system |
| CN101729187A (en) * | 2008-10-24 | 2010-06-09 | 华为技术有限公司 | Optical signal transmission processing method, sending device and system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110649A (en) * | 2007-06-18 | 2008-01-23 | 西安理工大学 | Wireless laser communication PPM polarization modulation and demodulation method |
| CN101729187A (en) * | 2008-10-24 | 2010-06-09 | 华为技术有限公司 | Optical signal transmission processing method, sending device and system |
| CN101510804A (en) * | 2009-03-26 | 2009-08-19 | 清华大学 | Method and apparatus for modulating and demodulating signal of optical fiber radio system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2488404A (en) * | 2011-02-16 | 2012-08-29 | Phoenix Inc 3 | Optically transporting a wideband RF signal |
| GB2488404B (en) * | 2011-02-16 | 2013-03-13 | Phoenix Inc 3 | Analog radio frequency transport over optical media using continuous optical phase modulation and noncoherent detection |
| US8861983B2 (en) | 2011-02-16 | 2014-10-14 | 3 Phoenix, Inc. | Analog radio frequency transport over optical media using continuous optical phase modulation and noncoherent detection |
| CN102904642A (en) * | 2012-10-25 | 2013-01-30 | 西南交通大学 | Wideband-simulated photon link dispersion decline compensation scheme based on intensity modulation diversity transmitter |
| CN104020334A (en) * | 2014-05-28 | 2014-09-03 | 江苏金迪电子科技有限公司 | Electro-optical phase modulator half-wave voltage measurement system and measurement method |
| CN112929088A (en) * | 2019-12-06 | 2021-06-08 | 华为技术有限公司 | Central unit, remote unit, small station system and communication method |
| CN112929088B (en) * | 2019-12-06 | 2022-10-28 | 华为技术有限公司 | Central unit, remote unit, small station system and communication method |
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