CN107947866A - Based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic - Google Patents
Based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic Download PDFInfo
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- CN107947866A CN107947866A CN201711470968.0A CN201711470968A CN107947866A CN 107947866 A CN107947866 A CN 107947866A CN 201711470968 A CN201711470968 A CN 201711470968A CN 107947866 A CN107947866 A CN 107947866A
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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
Abstract
Optic communication and microwave technical field are related to based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic, the invention the invention discloses one kind.The method as shown in drawings, including lasing light emitter, radio-frequency signal source, electric phase shifter, dual-polarization modulator, Polarization Controller, the polarizer.This method can obtain the optical SSB modulation signal of palarization multiplexing using dual-polarization modulator, by adjusting Polarization Controller, it can be achieved that the carrier wave sideband of optical SSB modulation signal compares flexible modulation.The single sideband singal that the present invention generates can be applied to light and carry in RF communication system, can solve signal periodic power fading problem caused by fibre-optical dispersion in remote transmission, by selecting suitable carrier wave sideband ratio, can greatly promote the transmission performance of system.In addition the configuration of the present invention is simple, to optical carrier wavelength non-selectivity, has wideband adjustable.
Description
Technical field
The present invention relates to optical communication field and microwave photon technology field, and in particular to one kind in light carries radio communication
High performance signal modulation system, i.e. carrier wave sideband optical SSB modulation more adjustable than dynamic.
Background technology
Traditional microwave technology has electronic bottleneck in processing speed and transmission bandwidth etc., and high-frequency signal is grown away from
There is very lossy during from transmission, and traditional fiber technology mobility is inadequate, Microwave photonics are recent decades microwave and photon
A special kind of skill of fusion, the wherein inexpensive mobile wireless connection mode of microwave technology offer, optical fiber technology offer low-loss,
Large capacity and electromagnetism interference transmission characteristic, it is intended to overcome the shortcomings of traditional microwave technology and traditional fiber technology, significantly
Improve microwave system working performance.Light carries the focus that radio communication has been increasingly becoming social concerns in recent years, although the system has
Many advantages, but the dispersion of optical fiber can make the signal period property power fade transmitted through optical fiber during remote transmission, influence to recover
The power of signal, so system modulation mode becomes the key factor for influencing signal transmission performance.With other modulation system phases
Than the problem of optical SSB modulation can alleviate power attenuation, improves signal transmission performance.
In view of the high transformation property of optical SSB modulation, it, which is obtained, continues widely research and concern.Tradition realizes light
The method of single sideband modulation has several, and simplest one kind is single use Mach and increases your moral modulator, upper road input radio frequency letter
Number, the lower shifted device input difference in road is 90 ° of radiofrequency signal, sets Dc bias modulator is operated in orthogonal points, at this time
The output of modulator is exactly single sideband modulated signal；Another method is that phase-modulator cascading Mach is increased your moral modulator,
Wherein phase-modulator is used for a series of light carrier producing sidebands using radio frequency signal frequency as interval, then passes through Mach increasing
Your moral modulator realizes optical SSB modulation.
On this basis it has been investigated that with appropriate light Single Side Band With Carrier than optical SSB modulation can significantly improve
The transmission performance and receiving sensitivity of light carrier radio communication system.It is more unilateral than adjustable with carrier wave sideband to there are some at present
Band modulation scheme, some schemes are based on optical filter, and shake and Bandwidth-Constrained due to wave filter, cause the system
Unstable and frequency tunability is limited, and such system application surface is not very wide；Another kind realizes carrier wave sideband than adjustable light
Single sideband modulation is to combine double drive Mach to increase your moral modulator and dual-polarization quadrature phase shift keying, and benefit is can be by varying
The bias voltage of modulator adjusts carrier wave sideband ratio, but this structure needs a complicated Dc bias controller, it limits
Made carrier wave sideband than adjustable range, and system is become complicated；Also one kind is that two light polarization modulators of cascade realize load
For ripple sideband than adjustable optical SSB modulation, this scheme benefit is not have to Dc bias, and adjusting Polarization Controller can change
Polarizer state is so as to adjust carrier wave sideband ratio, but the system needs two polarization adjusters, this make system become it is complicated and
It is expensive.
The content of the invention
In order to overcome the shortcomings of such scheme radiofrequency signal bandwidth be limited, it is expensive and complicated, invention describes one kind
The straightforward procedure of the modulation system is realized, based on dual-polarization modulator carrier wave sideband optical SSB modulation side more adjustable than dynamic
Method, this method realize the single sideband modulation of radiofrequency signal, lower way modulator using the upper way modulator of dual-polarization modulator
Realize the output of light carrier, after 90 ° of polarization rotators, upper and lower two paths of signals merges the light carrier of output through polarization multiplexer
For the optical SSB modulation signal of cross-polarization multiplexing, which is converted into linear polarization by Polarization Controller into the polarizer
Signal, can change output signal carrier sideband ratio by adjusting Polarization Controller.
Scheme is used by the present invention solves its technical problem：The method, which is related to device, includes lasing light emitter (LD), double
Polarize Mach and increase your moral modulator (DPol-MZM), radio-frequency signal source, phase shifter (PS), Polarization Controller (PC), the polarizer
(Pol)；The output terminal of LD is connected with the input terminal of DPol-MZM, and the output terminal of DPol-MZM is connected with the input terminal of PC, PC's
Output terminal is connected with the input terminal of Pol.This method is intended to realize the modulation system in the method for simpler, broadband, low cost,
So as to give play to the transmission performance advantage of single sideband modulation.
The DPol-MZM is composed in parallel by the sub- modulator X-MZM and Y-MZM with identical structure and performance, sub- tune
There are two rf inputs mouths and two Dc bias control ports on device processed respectively, upper road only has X-MZM, lower route Y-MZM
Formed with 90 ° of polarization rotators, then road signal merges at polarization multiplexer up and down.
The present invention comprises the following steps at work：
1) the light carrier input DPol-MZM that LD is sent, signal are divided into equal two in DPol-MZM through beam splitter
Point, upper road part inputs X-MZM, lower road part input Y-MZM；
2) radiofrequency signal is divided into two parts, and part loading is in the upper rf inputs mouth of sub- modulator X-MZM, another portion
The lower rf inputs mouth in X-MZM is loaded after lease making PS phase shifts, Y-MZM is without radio frequency signals drive, two rf inputs mouths
It is all unloaded；
3) Dc bias of two sub- modulators is set, X-MZM and Y-MZM is operated in orthogonal transmission point and maximum transmitted respectively
Point.The output terminal of X-MZM arrives optical SSB modulation signal, and the output terminal of Y-MZM obtains light carrier, merges through polarization multiplexer
For the optical SSB modulation signal of cross-polarization multiplexing；
4) the cross-polarization multiplexed optical single sideband modulated signal of DPol-MZM outputs is transformed into linear polarization into Pol by PC and believes
Number, it can obtain carrier wave sideband optical SSB modulation signal more adjustable than dynamic by adjusting PC.
The present invention proposes one kind and is based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic,
This method produces cross-polarization multiplexed optical single sideband modulated signal using DPol-MZM, which is transformed into by PC into Pol
Linear polarization signal, the folder of one main shaft of polarization multiplexer and polarizer main shaft in DPol-MZM can be changed by adjusting Polarization Controller
Angle, changes the relative size of light carrier and sideband signal power in output signal, realizes optical SSB modulation signal carrier sideband
The flexible modulation of ratio.
Compared with existing scheme, benefit of the invention has：1. it need to simply adjust Polarization Controller to can be achieved to carrying
Ripple sideband than tuning, there is very strong operability；2. compared with conventional optical SSB modulation method, the program uses single
One integrated modulator, it is inexpensive and relatively simple for structure, it is easy to realize；3. since present system need not use microwave
Photon filter, Bandwidth-Constrained be not serious, it is possible to achieve low frequency and bandwidth of operation is larger.Radiofrequency signal bandwidth model in this experiment
Enclose for 3GHz-17GHz, carrier wave sideband than adjustable extent arrive 55dB for -35dB.
Brief description of the drawings
Fig. 1 is the present invention based on schematic diagram of the DPol-MZM carrier waves sideband than adjustable optical SSB modulation；
Fig. 2 is the output signal spectrum of DPol-MZM when radio frequency signal frequency is 15GHz；
Fig. 3 is the output signal spectrum of radiofrequency signal DPol-MZM when 3GHz-17GHz changes；
Fig. 4 (a) be radiofrequency signal adjusted in 15GHz PC obtain different carrier wave sidebands than output signal spectrum；
Fig. 4 (b) is for figure (a) maximum with minimum carrier wave sideband than corresponding output signal spectrum.
Embodiment
Elaborate below in conjunction with the accompanying drawings to the embodiment of the present invention：The present embodiment using technical solution of the present invention before
Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down
The embodiment stated：As shown in Figure 1, the present embodiment includes DPol-MZM, PC, Pol and LD.The input terminal of LD and DPol-MZM
It is connected, the X-MZM of radio frequency signals drive DPol-MZM, its bias voltage is located at orthogonal points, and Y-MZM rf inputs mouth is unloaded,
Bias voltage is arranged on maximum point, and then Y-MZM is followed by 90 ° of polarization rotators, and upper and lower two paths of signals merges through polarization multiplexer
For the output of DPol-MZM, it is connected after through PC with the input terminal of Pol.
In this example, the specific implementation step of method is：
Step 1：It is 1551.86nm that lasing light emitter, which produces operation wavelength, and luminous power is that the continuous light carrier of 12dBm is input to
DPol-MZM, is denoted as E (t)=E0exp(jωct)；
Step 2：It is 15GHz radiofrequency signals that radio-frequency signal source, which produces frequency, and angular frequency is denoted as ωR, amplitude is denoted as VR, radio frequency letter
Number it is expressed as VRsin(ωRt).Radiofrequency signal is divided into two-way, the upper arm prevention at radio-frequency port of X-MZM is input to all the way, by another way
The underarm prevention at radio-frequency port that orthogonal radiofrequency signal is input to X-MZM is obtained by phase shifter, is expressed asBiasing
Voltage is arranged on orthogonal transmission point, and X-MZM carries out single sideband modulation, signal Ex(t) it is：
Y-MZM bias voltages are arranged on maximum point, and prevention at radio-frequency port is unloaded, and optical signal is not exported directly by modulation, signal Ey(t)
For：Light carrier merges into cross-polarization multiplexed optical by 90 ° of polarization rotator Hou Yushang roads modulated signals
Single sideband modulated signal, the signal include light carrier and negative one rank optical sideband, can be expressed as following formula：
Wherein Ex(t) and Ey(t) be respectively X-MZM and Y-MZM in DPol-MZM output, m be DPol-MZM modulation index,
M=π VR/Vπ, VπFor the half-wave voltage of DPol-MZM, Jn() is first kind n rank Bessel functions；
Step 3：The optical SSB signal of obtained cross-polarization multiplexing is transformed into linear polarization signal by PC into Pol,
The output signal of Pol can be expressed as：
Wherein α is the angle between one main shaft of polarization multiplexer and Pol main shafts in DPol-MZM, and carrier wave side can be drawn from above formula
Band is than formula：
Step 4：Radio frequency signal frequency is arranged to 15GHz, obtained optical SSB modulation signal spectrum as shown in Figure 2, from
For it can be seen from the figure that compares negative one rank sideband, the power of positive single order sideband is inhibited by about 30dB；
Step 5：In order to verify the wide-band tuning of single sideband modulation, radio frequency signal frequency scope is 3GHz-17GHz, is obtained
Optical SSB signal spectrum is as shown in Figure 3；
Step 6：In order to embody the carrier wave sideband of system than continuously adjustable, radio frequency signal frequency is arranged to 15GHz, is repeatedly adjusted
Whole PC can obtain frequency spectrum of the different carrier wave sidebands than signal, as shown in attached drawing 4 (a), carrier wave sideband than adjustable extent for-
35dB to 55dB, maximum suppression ratio and minimum suppression are than corresponding signal spectrum such as attached drawing 4 (b) Suo Shi.
To sum up, the present invention utilizes the devices such as DPol-MZM, PC, Pol to realize carrier wave sideband light more adjustable than dynamic unilateral
Band modulator approach, this programme bandwidth of operation is big, it is simple in structure, have that very strong operability, cost be low, carrier wave sideband is than adjustable
Scope is big, and microwave photon filter is not required in the system, overcomes the deficiency of existing program, it is carried radio communication system in light
It is applied even more extensively in system.
In short, embodiments described above is only the embodiment of the present invention, not it is only used for limiting the guarantor of the present invention
Protect scope, it is noted that for those skilled in the art, can be with present disclosure
Some deformations and replacement are made, such as phase shifter in this programme is changed to 90 ° of couplers can also realize carrier wave sideband than dynamic
Adjustable optical SSB modulation, or also adjust by adjusting the Dc bias of Y-MZM in DPol-MZM the load of output signal
Ripple sideband ratio, these equally change and the adjustment of frequency range also should be regarded as the scope of protection of the invention.
Claims (3)
1. based on dual-polarization modulator carrier wave sideband optical SSB modulation method more adjustable than dynamic, the method is related to device bag
Include lasing light emitter (LD), dual-polarization Mach increases your moral modulator (DPol-MZM), radio-frequency signal source, phase shifter (PS), Polarization Control
Device (PC), the polarizer (Pol), it is characterised in that the upper way modulator of DPol-MZM realizes the single sideband modulation of radiofrequency signal,
Lower way modulator realizes the output of light carrier, and the light carrier of output is after 90 ° of polarization rotators, and upper and lower two paths of signals is through polarization
Multiplexer merges into the optical SSB modulation signal of cross-polarization multiplexing, which is converted by Polarization Controller into the polarizer
For linear polarization signal, output signal carrier sideband ratio can be changed by adjusting Polarization Controller.
The DPol-MZM is composed in parallel by the sub- modulator X-MZM and Y-MZM with identical structure and performance, sub- modulator
Upper to have two rf inputs mouths and two Dc bias control ports respectively, upper road only has X-MZM, lower Y-MZM and 90 ° of route
Polarization rotator forms, and then road signal merges at polarization multiplexer up and down.
The upper way modulator (X-MZM) of the DPol-MZM realizes the optical SSB modulation of radiofrequency signal, its two-way radio frequency
Signal initial phase difference is 90 °, sets bias voltage X-MZM is operated in orthogonal transmission point.
The lower way modulator (Y-MZM) of the DPol-MZM realizes the output of former light carrier, the input of its two-way radiofrequency signal
End is unloaded, no radio frequency signals drive, sets bias voltage Y-MZM is operated in maximum transmitted point, optical carrier is not modulated
Directly export.
The PC and Pol are used for realization conversion of the cross-polarization multiplexed optical single sideband modulated signal to linear polarization signal.
It is 2. according to claim 1 based on dual-polarization modulator carrier wave sideband optical SSB modulation side more adjustable than dynamic
Method, it is characterised in that keep sub- modulator input parameter constant, DPol-MZM can produce the optical SSB of cross-polarization multiplexing
Modulated signal.
It is 3. according to claim 1 based on dual-polarization modulator carrier wave sideband optical SSB modulation side more adjustable than dynamic
Method, it is characterised in that can change folder in DPol-MZM between one main shaft of polarization multiplexer and Pol main shafts by adjusting PC
Angle, changes the relative size of light carrier and sideband signal power in output signal, makes carrier wave sideband more adjustable than dynamic.
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| CN110220540A (en) * | 2019-05-10 | 2019-09-10 | 中国船舶重工集团公司第七一五研究所 | A kind of detection light generation system applied to distributive fiber optic strain demodulation |
| CN110798268A (en) * | 2018-08-03 | 2020-02-14 | 西安电子科技大学 | Microwave signal optical fiber transmission method with high spectral efficiency and optimized power fading |
| CN108667517B (en) * | 2018-05-11 | 2020-07-31 | 北京工业大学 | Microwave photon frequency mixing method and system based on local oscillator frequency multiplication |
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| CN111917475A (en) * | 2020-06-28 | 2020-11-10 | 复旦大学 | System for simultaneously providing wired and single side band wireless services based on single modulator |
| CN112653523A (en) * | 2020-12-31 | 2021-04-13 | 武汉邮电科学研究院有限公司 | SSB signal generation method and device and intensity modulation direct detection system |
| CN112769496A (en) * | 2021-01-12 | 2021-05-07 | 江苏南方通信科技有限公司 | Device and method for optimizing SSB modulation radio over fiber link |
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| WO2021184548A1 (en) * | 2020-03-20 | 2021-09-23 | Dalian University Of Technology | Optical-electronic integrated rf leakage interference cancellation system and method for cw radar |
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| CN108667517B (en) * | 2018-05-11 | 2020-07-31 | 北京工业大学 | Microwave photon frequency mixing method and system based on local oscillator frequency multiplication |
| CN108809435A (en) * | 2018-05-30 | 2018-11-13 | 武汉邮电科学研究院有限公司 | Transmission system is examined in a kind of transmitting terminal of single sideband singal, production method and straight straightening |
| CN108761398A (en) * | 2018-05-31 | 2018-11-06 | 南京航空航天大学 | Microwave photon two waveband radar detection method and microwave photon two waveband radar |
| CN110798268A (en) * | 2018-08-03 | 2020-02-14 | 西安电子科技大学 | Microwave signal optical fiber transmission method with high spectral efficiency and optimized power fading |
| CN110798268B (en) * | 2018-08-03 | 2022-04-22 | 西安电子科技大学 | Microwave signal optical fiber transmission method with high spectral efficiency and optimized power fading |
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| WO2021184548A1 (en) * | 2020-03-20 | 2021-09-23 | Dalian University Of Technology | Optical-electronic integrated rf leakage interference cancellation system and method for cw radar |
| US11860259B2 (en) | 2020-03-20 | 2024-01-02 | Dalian University Of Technology | Optical-electronic integrated RF leakage interference cancellation system and method for CW radar |
| CN111585660A (en) * | 2020-04-20 | 2020-08-25 | 复旦大学 | Terahertz wave signal generator based on dual-polarization MZM modulator and communication system |
| CN111585660B (en) * | 2020-04-20 | 2022-12-16 | 复旦大学 | Terahertz wave signal generator based on dual-polarization MZM modulator and communication system |
| CN111917475B (en) * | 2020-06-28 | 2021-09-17 | 复旦大学 | System for simultaneously providing wired and single side band wireless services based on single modulator |
| CN111917475A (en) * | 2020-06-28 | 2020-11-10 | 复旦大学 | System for simultaneously providing wired and single side band wireless services based on single modulator |
| CN112653523A (en) * | 2020-12-31 | 2021-04-13 | 武汉邮电科学研究院有限公司 | SSB signal generation method and device and intensity modulation direct detection system |
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| CN112769496B (en) * | 2021-01-12 | 2023-12-22 | 江苏南方通信科技有限公司 | Device and method for optimizing SSB (secure subscriber line) modulation optical carrier wireless communication link |
| CN113098614A (en) * | 2021-03-12 | 2021-07-09 | 西安邮电大学 | Polarization multiplexing single sideband signal generating and receiving system and method |
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