CN104410462B - 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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- CN104410462B CN104410462B CN201410827320.4A CN201410827320A CN104410462B CN 104410462 B CN104410462 B CN 104410462B CN 201410827320 A CN201410827320 A CN 201410827320A CN 104410462 B CN104410462 B CN 104410462B
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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 light communication, and in particular to the method for optical signal modulation and direct detection based on palarization multiplexing
And device.
Background technology
Growing with optic communication, relevant optical transport technology has weight in the direction of ultrahigh speed vast capacity overlength distance
Quantum jump.However, in terms of Metropolitan Area Network (MAN) transmission, as transmission range is greatly shortened, using coherent light communication technology cost without
Method is effectively reduced, and the characteristic of low cost of direct detection system is just met for the requirement of Metropolitan Area Network (MAN) transmission.Direct detection system exists
Receiving terminal only needs a photodetector to receive signal, replaces the coherent receiver of coherent light communication receiving terminal, so that into
Originally there is great reduction.
Traditional direct detection system typically supports light intensity modulated signal, that is, the signal for being transmitted only is believed comprising amplitude
Breath, it is impossible to which phase place is modulated.However, only carrying amplitude information cannot meet communication requirement at this stage, in addition, in letter
The frequency selective fading that its performance greatly can be brought by dispersion in the case that number bandwidth is very high is affected, so as to can not
Longer-distance transmission is carried out enough.Another kind of implementation of direct detection system can solve frequency selective fading,
And the transmission to sophisticated signal can be realized, that is, carries the direct detection system of carrier information.But this kind of direct detection system
System has a problem that to be exactly that the availability of frequency spectrum is relatively low, it is impossible to using whole frequency spectrum resource.
In sum, there are the following problems for existing direct detection system：
(1) signal is subjected to affecting for the frequency selective fading that dispersion brings；
(2) availability of frequency spectrum is relatively low；
(3) transmission performance of system is relatively low.
The content of the invention
The technical problem to be solved is to solve existing direct detection system and there is signal and be subjected to dispersion to bring
The impact of frequency selective fading, the relatively low problem of relatively low and system the transmission performance of the availability of frequency spectrum.
In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is to provide a kind of light based on palarization multiplexing
Signal modulation and the method for direct detection, the method comprising the steps of：
Step 101：In transmitting terminal, single-side belt radiofrequency signal and double-side band baseband signal are mutually just being modulated into two respectively
On the light carrier of friendship, that is, it is modulated on X polarization directions and forms single sideband signals, is modulated on Y polarization directions and forms double-side band
Optical signal；
Step 102：By photo-coupler by single sideband signals on X polarization directions and double on Y polarization directions
Sideband optical signal closes ripple output；
Step 103：In receiving terminal, signal is received by a photodetector direct detection, obtain the bilateral tape base
Band signal and the mixing frequency spectrum of the single-side belt radiofrequency signal, then demodulate the mixing frequency spectrum and obtain the single-side belt radio frequency letter
Number, recycle the single-side belt radiofrequency signal that demodulation is obtained reconstruct the single-side belt radiofrequency signal from beat frequency component, from institute
The double-side band baseband signal is isolated in stating mixing frequency spectrum.
In the above-mentioned methods, the frequency interval f of the single-side belt radiofrequency signal and the light carrierSSBNot less than described
The bandwidth B of single sideband signalsSSB, the bandwidth B of the double-side band optical signalDSBLess than the single-side belt radiofrequency signal with it is described
The frequency interval f of light carrierSSBTwice.
Present invention also offers the device of a kind of optical signal modulation based on palarization multiplexing and direct detection, including send single
Unit and receiving unit,
The transmitting element includes polarization beam apparatus, I/Q modulator, intensity modulator and polarization beam combiner, and light source passes through institute
State polarization beam apparatus and be divided into the mutually orthogonal light carrier of two-way, orthogonal light carrier passes through the I/Q modulator by single-side belt all the way
Rf-signal modulation forms single sideband signals on X polarization directions, and the orthogonal light carrier in another road is by the intensity modulated
Double-side band modulates baseband signals are formed double-side band optical signal on Y polarization directions by device, are subsequently closed by the polarization beam combiner
Ripple is exported；
The receiving unit includes photodetector, analog-digital converter and digital signal processing module, the photodetection
Device is converted to the signal of telecommunication by signal is received, and analog-digital converter described in Jing is changed into digital signal, then by the digital signal
Reason module recovery goes out single-side belt radiofrequency signal and double-side band baseband signal.
In said apparatus, the frequency interval f of the single-side belt radiofrequency signal and light carrierSSBIt is monolateral not less than described
Bandwidth B with optical signalSSB, the bandwidth B of the double-side band optical signalDSBCarry less than the single-side belt radiofrequency signal and the light
The frequency interval f of rippleSSBTwice.
In said apparatus, the digital signal processing module obtains single-side belt radiofrequency signal, recycles single-side belt radio frequency
Signal reconstruction single-side belt radiofrequency signal from beat frequency component, isolate double-side band baseband signal.
The present invention, is formed by single-side belt radiofrequency signal and double-side band baseband signal are modulated on X polarization directions respectively
Single sideband signals, are modulated on Y polarization directions formation double-side band optical signal, by photo-coupler by single sideband signals and double
Sideband optical signal closes ripple output, by photodetector direct detection, obtains double-side band baseband signal and single-side belt radiofrequency signal
Mixing frequency spectrum, and demodulate mixing frequency spectrum obtain single-side belt radiofrequency signal, then using single-side belt radiofrequency signal reconstruct single-side belt
Radiofrequency signal from beat frequency component, isolate double-side band baseband signal from mixing frequency spectrum.The program, rationally make use of whole frequency
Spectrum resource, while avoiding double-side band baseband signal is subjected to affecting for frequency selective fading that dispersion brings, improves system
Transmission performance.
Description of the drawings
Fig. 1 is the method stream of a kind of optical signal modulation based on palarization multiplexing provided in an embodiment of the present invention and direct detection
Cheng Tu；
Fig. 2 is transmitting terminal optical signal spectrum schematic diagram provided in an embodiment of the present invention；
Fig. 3 is receiving terminal signal of telecommunication spectrum diagram provided in an embodiment of the present invention；
Fig. 4 is the device knot of a kind of optical signal modulation based on palarization multiplexing provided in an embodiment of the present invention and direct detection
Structure schematic diagram.
Specific embodiment
The present invention is described in detail with reference to specification drawings and specific embodiments.
A kind of method for embodiments providing optical signal modulation based on palarization multiplexing and direct detection, such as Fig. 1
It is shown, the method comprising the steps of：
Step 101, in transmitting terminal, single-side belt radiofrequency signal and double-side band baseband signal are mutually just being modulated into two respectively
On the light carrier of friendship, that is, it is modulated on X polarization directions and forms single sideband signals, is modulated on Y polarization directions and forms double-side band
Optical signal.
Fig. 2 is transmitting terminal optical signal spectrum schematic diagram, as shown in Fig. 2 by single-side belt rf-signal modulation in X polarization directions
Upper formation single sideband signals (SSB signal), double-side band modulates baseband signals are formed on Y polarization directions double-side band optical signal
(DSB signals), wherein, the frequency interval f of single-side belt radiofrequency signal and light carrierSSBNot less than the bandwidth of single sideband signals
BSSB, the bandwidth B of double-side band optical signalDSBLess than single-side belt radiofrequency signal and the frequency interval f of light carrierSSBTwice.
Step 102, by photo-coupler by single sideband signals on X polarization directions and double on Y polarization directions
Sideband optical signal closes ripple output.
Step 103, in receiving terminal, receive signal by a photodetector direct detection, obtain the bilateral tape base
Band signal and the mixing frequency spectrum of the single-side belt radiofrequency signal, then demodulate the mixing frequency spectrum and obtain the single-side belt radio frequency letter
Number, recycle the single-side belt radiofrequency signal that demodulation is obtained reconstruct the single-side belt radiofrequency signal from beat frequency component, from institute
The double-side band baseband signal is isolated in stating mixing frequency spectrum.
Fig. 3 is receiving terminal signal of telecommunication spectrum diagram, receives the spectrogram that signal is obtained after a photodetector
As shown in figure 3, wherein SSBI is single-side belt radiofrequency signal from beat frequency component.
The present invention, is formed by single-side belt radiofrequency signal and double-side band baseband signal are modulated on X polarization directions respectively
Single sideband signals, are modulated on Y polarization directions formation double-side band optical signal, by photo-coupler by single sideband signals and double
Sideband optical signal closes ripple output, by photodetector direct detection, obtains double-side band baseband signal and single-side belt radiofrequency signal
Mixing frequency spectrum, and demodulate mixing frequency spectrum obtain single-side belt radiofrequency signal, then using single-side belt radiofrequency signal reconstruct single-side belt
Radiofrequency signal from beat frequency component, isolate double-side band baseband signal from mixing frequency spectrum.The program, rationally make use of whole frequency
Spectrum resource, while avoiding double-side band baseband signal is subjected to affecting for frequency selective fading that dispersion brings, improves system
Transmission performance.
The embodiment of the present invention additionally provides the device of a kind of optical signal modulation based on palarization multiplexing and direct detection, such as schemes
Shown in 4, including transmitting element and receiving unit,
The transmitting element includes polarization beam apparatus 10, I/Q modulator 20, intensity modulator 30 and polarization beam combiner 40, light
10 points by the polarization beam apparatus of source is the mutually orthogonal light carrier of two-way, and orthogonal light carrier is modulated by the IQ all the way
Single-side belt rf-signal modulation is formed single sideband signals on X polarization directions by device 20, and the orthogonal light carrier in another road passes through
Double-side band modulates baseband signals are formed double-side band optical signal on Y polarization directions by the intensity modulator 30, subsequently by one
The polarization beam combiner 40 of individual 3db closes ripple output；
The receiving unit includes photodetector 50, analog-digital converter 60 and digital signal processing module 70, the light
Electric explorer 50 is converted to the signal of telecommunication by signal is received, and analog-digital converter 60 is changed into digital signal described in Jing, then by described
Digital signal processing module 70 recovers single-side belt radiofrequency signal and double-side band baseband signal.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the knot made under the enlightenment of the present invention
Structure change, it is every with of the invention with same or like technical scheme, each fall within protection scope of the present invention.
Claims (3)
1. the method for the optical signal modulation based on palarization multiplexing and direct detection, it is characterised in that methods described includes following step
Suddenly:
Step 101：In transmitting terminal, by single-side belt radiofrequency signal and double-side band baseband signal modulate respectively two it is mutually orthogonal
On light carrier, that is, it is modulated on X polarization directions and forms single sideband signals, is modulated on Y polarization directions and forms double-side band light letter
Number；
Step 102：By photo-coupler by the single sideband signals on X polarization directions and the double-side band on Y polarization directions
Optical signal closes ripple output；
Step 103：In receiving terminal, signal is received by a photodetector direct detection, obtain the double-side band base band letter
Mixing frequency spectrum number with the single-side belt radiofrequency signal, then demodulates the mixing frequency spectrum and obtains the single-side belt radiofrequency signal,
Recycle the single-side belt radiofrequency signal that demodulation is obtained reconstruct the single-side belt radiofrequency signal from beat frequency component, from described mixed
The double-side band baseband signal is isolated in sum of fundamental frequencies spectrum；
The frequency interval Δ f of the single-side belt radiofrequency signal and the light carrierSSBNot less than the bandwidth of the single sideband signals
BSSB, the bandwidth B of the double-side band optical signalDSBLess than the frequency interval Δ of the single-side belt radiofrequency signal and the light carrier
fSSBTwice.
2. the device of the optical signal modulation based on palarization multiplexing and direct detection, including transmitting element and receiving unit, its feature
It is,
The transmitting element includes polarization beam apparatus, I/Q modulator, intensity modulator and polarization beam combiner, and light source is by described inclined
The beam splitter that shakes is divided into the mutually orthogonal light carrier of two-way, and orthogonal light carrier passes through the I/Q modulator by single-side belt radio frequency all the way
Signal modulation forms single sideband signals on X polarization directions, and the orthogonal light carrier in another road will by the intensity modulator
Double-side band modulates baseband signals form double-side band optical signal on Y polarization directions, subsequently close ripple by the polarization beam combiner defeated
Go out；
The receiving unit includes photodetector, analog-digital converter and digital signal processing module, and the photodetector will
Receive signal and be converted to the signal of telecommunication, obtain the mixing frequency spectrum of the double-side band baseband signal and the single-side belt radiofrequency signal, and
Analog-digital converter described in Jing is changed into digital signal, then by the digital signal processing module recover single-side belt radiofrequency signal and
Double-side band baseband signal；
The frequency interval Δ f of the single-side belt radiofrequency signal and light carrierSSBNot less than the bandwidth B of the single sideband signalsSSB,
The bandwidth B of the double-side band optical signalDSBLess than the frequency interval Δ f of the single-side belt radiofrequency signal and the light carrierSSB
Twice.
3. the device of the optical signal modulation based on palarization multiplexing as claimed in claim 2 and direct detection, it is characterised in that institute
State digital signal processing module and obtain single-side belt radiofrequency signal, recycle single-side belt radiofrequency signal reconstruct single-side belt radiofrequency signal
From beat frequency component, double-side band baseband signal is isolated.
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| 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 |
| 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 |
| CN105490749A (en) * | 2015-12-14 | 2016-04-13 | 北京科技大学 | Polarization multiplexing direct detection system and method |
| 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 |
| CN108566250B (en) * | 2018-03-02 | 2021-03-12 | 北京大学 | Modulation and demodulation method and system based on carrier quadrature bias single sideband signal |
| CN108683453B (en) * | 2018-04-18 | 2020-08-21 | 华中科技大学 | Linear direct detection method and system based on synthetic single sideband signal |
| 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 |
| 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 |
| CN111614403B (en) * | 2020-04-27 | 2023-08-29 | 复旦大学 | M of intensity modulator based on polarization multiplexing 2 Method and system for generating QAM RF signal |
| 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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