CN104410462A - Polarization-multiplexing-based method and device for modulating and directly detecting optical signals - Google Patents
Polarization-multiplexing-based method and device for modulating and directly detecting optical signals Download PDFInfo
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Abstract
The invention discloses a polarization-multiplexing-based method and device for modulating and directly detecting optical signals. The method comprises the following steps: respectively modulating single side band radio-frequency signals and double side band baseband signals in an X polarization direction to form single side band optical signals, and modulating single side band radio-frequency signals and double side band baseband signals in a Y polarization direction to form double side band optical signals at a sending end; combining and outputting the single side band optical signals and the double side band optical signals by an optical coupler; directly detecting receiving signals at a receiving end by a photoelectric detector to obtain a hybrid frequency spectrum of the double side band optical signals and the single side band optical signals, then demodulating the hybrid frequency spectrum to obtain the single side band radio-frequency signals, reconstituting autodyne frequency components of the single side band optical signal by using the single side band optical signals obtained by demodulating, and separating the double side band baseband signals out of the hybrid frequency spectrum. By virtue of the polarization-multiplexing-based method and device for modulating and directly detecting optical signals, the whole frequency spectrum resource is reasonably used; the influence of frequency selective fading caused by chromatic dispersion of the double side band baseband signals is avoided; the transmission performance of the system is improved.
Description
Technical field
The present invention relates to coherent optical communication, be specifically related to based on the optical signal modulation of palarization multiplexing and the method for direct-detection and device.
Background technology
Growing along with optical communication, coherent light transmission technology has important breakthrough in the direction of ultrahigh speed vast capacity overlength distance.But, in metropolitan area network transmission, because transmission range shortens greatly, adopt the cost of coherent optical communication technology effectively to reduce, and the characteristic of low cost of direct-detection system just meet the requirement of metropolitan area network transmission.Direct-detection system only needs a photoelectric detector signal at receiving terminal, replaces the coherent receiver of coherent optical communication receiving terminal, thus cost is had great reduction.
Traditional direct-detection system generally supports light intensity modulated signal, and namely transmitted signal only comprises amplitude information, cannot modulate phase place.But only carry the communication requirement that amplitude information cannot meet present stage, in addition, when signal bandwidth is very high, its performance can be subject to the impact of the frequency selective fading that dispersion brings greatly, thus can not carry out longer-distance transmission.The another kind of implementation of direct-detection system can solve frequency selective fading, and can realize the transmission to sophisticated signal, namely carries the direct-detection system of carrier information.But it is exactly that the availability of frequency spectrum is lower that this kind of direct-detection system exists a problem, cannot utilize whole frequency spectrum resource.
In sum, there are the following problems for existing direct-detection system:
(1) impact of the signal frequency selective fading that brought by dispersion;
(2) availability of frequency spectrum is lower;
(3) transmission performance of system is lower.
Summary of the invention
Technical problem to be solved by this invention solves existing direct-detection system to there is the impact of the frequency selective fading that signal is brought by dispersion, problem that availability of frequency spectrum transmission performance that is lower and system is lower.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is to provide a kind of based on the optical signal modulation of palarization multiplexing and the method for direct-detection, said method comprising the steps of:
Step 101: at transmitting terminal, is modulated to single-side belt radiofrequency signal and double-side band baseband signal respectively on two mutually orthogonal light carriers, is namely modulated on X polarization direction and forms single sideband signals, be modulated on Y polarization direction and form double-side band light signal;
Step 102: by optical coupler, the single sideband signals on X polarization direction and the double-side band light signal on Y polarization direction are closed ripple and export;
Step 103: at receiving terminal, Received signal strength is by a photodetector direct detection, what obtain described double-side band baseband signal and described single-side belt radiofrequency signal mixes frequency spectrum, then mix frequency spectrum described in demodulation and obtain described single-side belt radiofrequency signal, the described single-side belt radiofrequency signal that obtains of recycling demodulation reconstruct described single-side belt radiofrequency signal from beat frequency component, from described mixing frequency spectrum, isolate described double-side band baseband signal.
In the above-mentioned methods, the frequency interval f of described single-side belt radiofrequency signal and described light carrier
sSBbe not less than the bandwidth B of described single sideband signals
sSB, the bandwidth B of described double-side band light signal
dSBbe no more than the frequency interval f of described single-side belt radiofrequency signal and described light carrier
sSBtwice.
Present invention also offers and a kind ofly comprise transmitting element and receiving element based on the optical signal modulation of palarization multiplexing and the device of direct-detection,
Described transmitting element comprises polarization beam apparatus, I/Q modulator, intensity modulator and polarization beam combiner, the light carrier that light source is divided into two-way mutually orthogonal by described polarization beam apparatus, single-side belt rf-signal modulation is formed single sideband signals by described I/Q modulator by the orthogonal light carrier in one road on X polarization direction, double-side band modulates baseband signals is formed double-side band light signal by described intensity modulator by the orthogonal light carrier in another road on Y polarization direction, closes ripple subsequently export by described polarization beam combiner;
Described receiving element comprises photodetector, analog to digital converter and digital signal processing module, Received signal strength is converted to the signal of telecommunication by described photodetector, and change digital signal into through described analog to digital converter, then recover single-side belt radiofrequency signal and double-side band baseband signal by described digital signal processing module.
In said apparatus, the frequency interval f of described single-side belt radiofrequency signal and light carrier
sSBbe not less than the bandwidth B of described single sideband signals
sSB, the bandwidth B of described double-side band light signal
dSBbe no more than the frequency interval f of described single-side belt radiofrequency signal and described light carrier
sSBtwice.
In said apparatus, described digital signal processing module obtains single-side belt radiofrequency signal, recycling single-side belt radiofrequency signal reconstruct single-side belt radiofrequency signal from beat frequency component, isolate double-side band baseband signal.
The present invention, single sideband signals is formed by single-side belt radiofrequency signal and double-side band baseband signal being modulated at respectively on X polarization direction, be modulated on Y polarization direction and form double-side band light signal, by optical coupler, single sideband signals and double-side band light signal are closed ripple to export, by photodetector direct detection, what obtain double-side band baseband signal and single-side belt radiofrequency signal mixes frequency spectrum, and demodulation mixing frequency spectrum obtains single-side belt radiofrequency signal, then utilize single-side belt radiofrequency signal reconstruct single-side belt radiofrequency signal from beat frequency component, double-side band baseband signal is isolated from mixing frequency spectrum.The program, the whole frequency spectrum resource of Appropriate application, avoids the impact of the frequency selective fading that double-side band baseband signal is brought by dispersion simultaneously, improves the transmission performance of system.
Accompanying drawing explanation
Fig. 1 for the embodiment of the present invention provide a kind of based on the optical signal modulation of palarization multiplexing and the method flow diagram of direct-detection;
The transmitting terminal optical signal spectrum schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The receiving terminal signal of telecommunication spectrum diagram that Fig. 3 provides for the embodiment of the present invention;
The apparatus structure schematic diagram of a kind of optical signal modulation based on palarization multiplexing that Fig. 4 provides for the embodiment of the present invention and direct-detection.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is described in detail.
Embodiments provide a kind of based on the optical signal modulation of palarization multiplexing and the method for direct-detection, as shown in Figure 1, said method comprising the steps of:
Step 101, at transmitting terminal, single-side belt radiofrequency signal and double-side band baseband signal are modulated to respectively on two mutually orthogonal light carriers, are namely modulated on X polarization direction and form single sideband signals, be modulated on Y polarization direction and form double-side band light signal.
Fig. 2 is transmitting terminal optical signal spectrum schematic diagram, as shown in Figure 2, single-side belt rf-signal modulation is formed single sideband signals (SSB signal) on X polarization direction, double-side band modulates baseband signals is formed on Y polarization direction double-side band light signal (DSB signal), wherein, the frequency interval f of single-side belt radiofrequency signal and light carrier
sSBbe not less than the bandwidth B of single sideband signals
sSB, the bandwidth B of double-side band light signal
dSBbe no more than the frequency interval f of single-side belt radiofrequency signal and light carrier
sSBtwice.
Step 102, by optical coupler, the single sideband signals on X polarization direction and the double-side band light signal on Y polarization direction are closed ripple and export.
Step 103, at receiving terminal, Received signal strength is by a photodetector direct detection, what obtain described double-side band baseband signal and described single-side belt radiofrequency signal mixes frequency spectrum, then mix frequency spectrum described in demodulation and obtain described single-side belt radiofrequency signal, the described single-side belt radiofrequency signal that obtains of recycling demodulation reconstruct described single-side belt radiofrequency signal from beat frequency component, from described mixing frequency spectrum, isolate described double-side band baseband signal.
Fig. 3 is receiving terminal signal of telecommunication spectrum diagram, Received signal strength by the spectrogram that obtains after a photodetector as shown in Figure 3, wherein SSBI be single-side belt radiofrequency signal from beat frequency component.
The present invention, single sideband signals is formed by single-side belt radiofrequency signal and double-side band baseband signal being modulated at respectively on X polarization direction, be modulated on Y polarization direction and form double-side band light signal, by optical coupler, single sideband signals and double-side band light signal are closed ripple to export, by photodetector direct detection, what obtain double-side band baseband signal and single-side belt radiofrequency signal mixes frequency spectrum, and demodulation mixing frequency spectrum obtains single-side belt radiofrequency signal, then utilize single-side belt radiofrequency signal reconstruct single-side belt radiofrequency signal from beat frequency component, double-side band baseband signal is isolated from mixing frequency spectrum.The program, the whole frequency spectrum resource of Appropriate application, avoids the impact of the frequency selective fading that double-side band baseband signal is brought by dispersion simultaneously, improves the transmission performance of system.
The embodiment of the present invention additionally provides a kind of based on the optical signal modulation of palarization multiplexing and the device of direct-detection, as shown in Figure 4, comprises transmitting element and receiving element,
Described transmitting element comprises polarization beam apparatus 10, I/Q modulator 20, intensity modulator 30 and polarization beam combiner 40, the light carrier that light source is divided into two-way mutually orthogonal by described polarization beam apparatus 10, single-side belt rf-signal modulation is formed single sideband signals by described I/Q modulator 20 by the orthogonal light carrier in one road on X polarization direction, double-side band modulates baseband signals is formed double-side band light signal by described intensity modulator 30 by the orthogonal light carrier in another road on Y polarization direction, closes ripple subsequently export by the polarization beam combiner 40 of a 3db;
Described receiving element comprises photodetector 50, analog to digital converter 60 and digital signal processing module 70, Received signal strength is converted to the signal of telecommunication by described photodetector 50, and change digital signal into through described analog to digital converter 60, then recover single-side belt radiofrequency signal and double-side band baseband signal by described digital signal processing module 70.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (5)
1., based on the optical signal modulation of palarization multiplexing and the method for direct-detection, it is characterized in that, said method comprising the steps of:
Step 101: at transmitting terminal, is modulated to single-side belt radiofrequency signal and double-side band baseband signal respectively on two mutually orthogonal light carriers, is namely modulated on X polarization direction and forms single sideband signals, be modulated on Y polarization direction and form double-side band light signal;
Step 102: by optical coupler, the single sideband signals on X polarization direction and the double-side band light signal on Y polarization direction are closed ripple and export;
Step 103: at receiving terminal, Received signal strength is by a photodetector direct detection, what obtain described double-side band baseband signal and described single-side belt radiofrequency signal mixes frequency spectrum, then mix frequency spectrum described in demodulation and obtain described single-side belt radiofrequency signal, the described single-side belt radiofrequency signal that obtains of recycling demodulation reconstruct described single-side belt radiofrequency signal from beat frequency component, from described mixing frequency spectrum, isolate described double-side band baseband signal.
2. the method for claim 1, is characterized in that, the frequency interval f of described single-side belt radiofrequency signal and described light carrier
sSBbe not less than the bandwidth B of described single sideband signals
sSB, the bandwidth B of described double-side band light signal
dSBbe no more than the frequency interval f of described single-side belt radiofrequency signal and described light carrier
sSBtwice.
3., based on the optical signal modulation of palarization multiplexing and the device of direct-detection, comprise transmitting element and receiving element, it is characterized in that,
Described transmitting element comprises polarization beam apparatus, I/Q modulator, intensity modulator and polarization beam combiner, the light carrier that light source is divided into two-way mutually orthogonal by described polarization beam apparatus, single-side belt rf-signal modulation is formed single sideband signals by described I/Q modulator by the orthogonal light carrier in one road on X polarization direction, double-side band modulates baseband signals is formed double-side band light signal by described intensity modulator by the orthogonal light carrier in another road on Y polarization direction, closes ripple subsequently export by described polarization beam combiner;
Described receiving element comprises photodetector, analog to digital converter and digital signal processing module, Received signal strength is converted to the signal of telecommunication by described photodetector, and change digital signal into through described analog to digital converter, then recover single-side belt radiofrequency signal and double-side band baseband signal by described digital signal processing module.
4. as claimed in claim 3 based on the optical signal modulation of palarization multiplexing and the device of direct-detection, it is characterized in that, the frequency interval f of described single-side belt radiofrequency signal and light carrier
sSBbe not less than the bandwidth B of described single sideband signals
sSB, the bandwidth B of described double-side band light signal
dSBbe no more than the frequency interval f of described single-side belt radiofrequency signal and described light carrier
sSBtwice.
5. as claimed in claim 3 based on the optical signal modulation of palarization multiplexing and the device of direct-detection, it is characterized in that, described digital signal processing module obtains single-side belt radiofrequency signal, recycling single-side belt radiofrequency signal reconstruct single-side belt radiofrequency signal from beat frequency component, isolate double-side band baseband signal.
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| CN105281862A (en) * | 2015-11-04 | 2016-01-27 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| CN105490749A (en) * | 2015-12-14 | 2016-04-13 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| CN105553560A (en) * | 2015-12-07 | 2016-05-04 | 武汉邮电科学研究院 | Polarization-independence direct detection system and method based on light intensity modulation signal |
| CN106301588A (en) * | 2016-09-28 | 2017-01-04 | 北京科技大学 | A kind of single-side belt palarization multiplexing direct detecting method and system |
| CN106357343A (en) * | 2016-10-09 | 2017-01-25 | 兰州理工大学 | Light-space-time trellis code encoding method suitable for intensity modulation/direction detection |
| CN108566250A (en) * | 2018-03-02 | 2018-09-21 | 北京大学 | A kind of modulator approach, demodulation method and system biasing single sideband singal based on multicarrier orthogonal |
| CN108683453A (en) * | 2018-04-18 | 2018-10-19 | 华中科技大学 | A kind of linear direct detection method and system based on synthesis single sideband singal |
| 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 |
| CN109067468A (en) * | 2018-06-07 | 2018-12-21 | 武汉邮电科学研究院有限公司 | Applied to straight inspection optical communication system KK transmission method and directly examine optical communication system |
| CN111614403A (en) * | 2020-04-27 | 2020-09-01 | 复旦大学 | M2-QAM RF signal generation method and system based on polarization multiplexed intensity modulator |
| CN112087248A (en) * | 2020-08-16 | 2020-12-15 | 复旦大学 | Generation of PDM-m based on polarization multiplexed light modulators2Optical fiber-wireless communication system for QAM radio frequency signals |
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| CN105281862A (en) * | 2015-11-04 | 2016-01-27 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| CN105281862B (en) * | 2015-11-04 | 2017-09-29 | 北京科技大学 | A kind of direct detecting system of palarization multiplexing and method |
| CN105553560A (en) * | 2015-12-07 | 2016-05-04 | 武汉邮电科学研究院 | Polarization-independence direct detection system and method based on light intensity modulation signal |
| CN105553560B (en) * | 2015-12-07 | 2018-01-02 | 武汉邮电科学研究院 | Polarization based on light intensity modulated signal unrelated directly detecting system and method |
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| CN106301588A (en) * | 2016-09-28 | 2017-01-04 | 北京科技大学 | A kind of single-side belt palarization multiplexing direct detecting method and system |
| CN106357343A (en) * | 2016-10-09 | 2017-01-25 | 兰州理工大学 | Light-space-time trellis code encoding method suitable for intensity modulation/direction detection |
| CN108566250A (en) * | 2018-03-02 | 2018-09-21 | 北京大学 | A kind of modulator approach, demodulation method and system biasing single sideband singal based on multicarrier orthogonal |
| CN108683453A (en) * | 2018-04-18 | 2018-10-19 | 华中科技大学 | A kind of linear direct detection method and system based on synthesis single sideband singal |
| 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 |
| CN109067468A (en) * | 2018-06-07 | 2018-12-21 | 武汉邮电科学研究院有限公司 | Applied to straight inspection optical communication system KK transmission method and directly examine optical communication system |
| CN109067468B (en) * | 2018-06-07 | 2019-12-31 | 武汉邮电科学研究院有限公司 | KK transmission method applied to direct detection optical communication system and direct detection optical communication system |
| CN111614403A (en) * | 2020-04-27 | 2020-09-01 | 复旦大学 | M2-QAM RF signal generation method and system based on polarization multiplexed intensity modulator |
| CN111614403B (en) * | 2020-04-27 | 2023-08-29 | 复旦大学 | M2-QAM RF signal generation method and system based on polarization multiplexing intensity modulator |
| CN112087248A (en) * | 2020-08-16 | 2020-12-15 | 复旦大学 | Generation of PDM-m based on polarization multiplexed light modulators2Optical fiber-wireless communication system for QAM radio frequency signals |
| CN112087248B (en) * | 2020-08-16 | 2021-06-04 | 复旦大学 | Generation of PDM-m based on polarization multiplexed light modulators2Optical fiber-wireless communication system for QAM radio frequency signals |
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