CN203327012U - Multi-wavelength optical fiber wireless single-sideband modulation system - Google Patents
Multi-wavelength optical fiber wireless single-sideband modulation system Download PDFInfo
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- CN203327012U CN203327012U CN2013202572326U CN201320257232U CN203327012U CN 203327012 U CN203327012 U CN 203327012U CN 2013202572326 U CN2013202572326 U CN 2013202572326U CN 201320257232 U CN201320257232 U CN 201320257232U CN 203327012 U CN203327012 U CN 203327012U
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Abstract
A multi-wavelength optical fiber wireless single-sideband modulation system relates to optical fiber communication, optical fiber sensing, microwave photon, and periodic sawtooth wave spectrum filter technologies. The system comprises a continuous wave laser array (1), a dual-electrode Mach Zehnder modulator (2), a sine wave local oscillator (3), a 180-degree power divider (4), an offset voltage source (5), a periodic sawtooth wave spectrum filter (6), a transmission optical fiber (7), and a photoelectric detector (8). The multi-wavelength optical fiber wireless single-sideband modulation system can be obtained by sequentially connecting the aforementioned parts. Moreover, the carrier-to-sideband ratio can be optimized and the link performance can be effectively improved.
Description
Technical field
The utility model relates to optical fiber communication, Fibre Optical Sensor, microwave photon, periodicity sawtooth waveforms spectral filter, is exactly the wireless single-side band modulation system of a kind of multi-wavelength optical fiber specifically.
Background technology
Growing along with people to information requirement, radio spectrum resources can not meet people's demand.Optical fiber radio communication (Radio Over Fiber, ROF), once proposition, just causes people's interest at once, has carried out extensive and deep research.Optical fiber radio communication is called again millimetre-wave attenuator or microwave photon, it is a new branch of science, research range is very extensive, comprises the optics generation method of millimeter-wave signal, the opto-electronic device of millimere-wave band, the optical transport technology of millimeter-wave frequency, the modulation technique of millimeter-wave frequency etc.In the middle of the optical fiber millimeter-wave communication system, generally adopt the scheme of intensity modulated/direct-detection, intensity modulator generally adopts the lithium niobate external modulator, realizes double-sideband modulation.During double-sideband modulation, due to the impact of optical fiber dispersion, the electric signal power of exporting through photodetector presents the periodic swinging decline with fiber lengths.If add dispersion compensation unit in every optical fiber link, can cause that system cost sharply rises, the system configuration complexity, cause the cost performance degradation.The optical-fiber wireless single-side band modulation can effectively solve output electrical signals that double-sideband modulation the brings problem with the decline of fiber lengths periodic swinging.On the other hand, when using single-side band modulation, the carrier wave sideband has a great impact link performance than the size of (Carrier-to-Sideband Radio, CSR).Research shows, when CSR=0dB, and the link performance optimum.Therefore can realize that the optical-fiber wireless system single-side band modulation can optimize again the scheme of CSR simultaneously and in succession be suggested, these schemes comprise based on Triangle Spectrum chirped fiber Bragg grating (document " preparation of Triangle Spectrum chirped fiber grating and the application in optical-fiber wireless single-side band modulation system thereof "), based on rewriteeing Fiber Bragg Grating FBG (document " Overwritten fiber Bragg grating and its application in an optical single with carrier modulation radio over fiber system "), based on long period fiber grating (document " Single-sideband modulated radio-over-fiber system based on long period fiber grating ").But the common shortcoming of these schemes is operation wavelengths only has 1, can only be for the optical-fiber wireless single-side band modulation system of single wavelength.And the service behaviour of grating is affected by environment very large, when operational environment changes, can causes the drift of grating resonance wavelength, thereby cause system performance degradation.Therefore the utility model adopts periodically sawtooth waveforms spectral filter to carry out filtering to the light double-sideband signal, makes the attenuation difference of distinct sidebands, and its result can be similar to thinks a kind of single sideband modulated signal, has optimized CSR simultaneously.Due to the periodic characteristic of this spectral filter, therefore can be used in the middle of the multi-wavelength optical communication system again, realize the wireless single-side band modulation system of a kind of multi-wavelength optical fiber.This scheme covers the optical communicating waveband scope extensively and has the characteristic of multi-wavelength, and scheme implementation is simple, economical, and system reliability is strong.
The utility model content
The utility model provides a kind of simple, economic, reliable optical-fiber wireless single-side band modulation system based on periodicity sawtooth waveforms spectral filter, the original intention of invention is to utilize periodicity sawtooth waveforms spectral filter that multi-wavelength, transmission spectrum slope are large and a small amount of standard light communication apparatus, realizes the optical-fiber wireless single-side band modulation.Its basic principle is to utilize bipolar electrode MZ Mach-Zehnder (Dual-Electrode Mach Zehnder Modulator, DE-MZM) to work in the maximum transmitted point, and radio frequency signals drive DE-MZM produces the double-sideband modulation light wave.The double-sideband modulation light wave is by after sawtooth waveforms spectral filter filtering periodically, and due to the attenuation difference that the double-side band distinct sidebands is formed, so output signal can be similar to and regard single sideband singal as, reduced CSR simultaneously.
The wireless single-side band modulation system of a kind of multi-wavelength optical fiber is characterized in that: continuous-wave laser array, bipolar electrode MZ Mach-Zehnder, sinusoidal wave local oscillator, 180 degree power splitters, bias voltage source, periodicity sawtooth waveforms spectral filter, Transmission Fibers, photoelectric detector;
Concrete connected mode is:
The light output end of continuous-wave laser array connects the light input end of bipolar electrode MZ Mach-Zehnder, the electrical input of the electricity output termination 180 degree power splitters of sinusoidal wave local oscillator, the first electricity that the electric output port of 180 degree of 180 degree power splitters connects the bipolar electrode MZ Mach-Zehnder drives port, the second electricity that the electric output port of 0 degree of 180 degree power splitters connects the bipolar electrode MZ Mach-Zehnder drives port, the voltage bias port of the electricity output termination bipolar electrode MZ Mach-Zehnder of bias voltage source, the light output end of bipolar electrode MZ Mach-Zehnder connects the periodically light input end of sawtooth waveforms spectral filter, periodically the light output end of sawtooth waveforms spectral filter connects the Transmission Fibers input, the light input end of Transmission Fibers output termination photoelectric detector.
The technical solution of the utility model:
The wireless single-side band modulation system of a kind of multi-wavelength optical fiber, this system comprises continuous-wave laser array, bipolar electrode MZ Mach-Zehnder, sinusoidal wave local oscillator, 180 degree power splitters, bias voltage source, periodicity sawtooth waveforms spectral filter, Transmission Fibers, photoelectric detector.
Concrete connected mode is:
The light output end of continuous-wave laser array connects the light input end of bipolar electrode MZ Mach-Zehnder, the electrical input of the electricity output termination 180 degree power splitters of sinusoidal wave local oscillator, the first electricity that the electric output port of 180 degree of 180 degree power splitters connects the bipolar electrode MZ Mach-Zehnder drives port, the second electricity that the electric output port of 0 degree of 180 degree power splitters connects the bipolar electrode MZ Mach-Zehnder drives port, the voltage bias port of the electricity output termination bipolar electrode MZ Mach-Zehnder of bias voltage source, the light output end of bipolar electrode MZ Mach-Zehnder connects the periodically light input end of sawtooth waveforms spectral filter, periodically the light output end of sawtooth waveforms spectral filter connects the Transmission Fibers input, the light input end of Transmission Fibers output termination photoelectric detector.
The beneficial effects of the utility model are specific as follows:
Core devices of the present utility model is sawtooth waveforms spectral filter periodically, and due to the cyclophysis of this filter, so this utility model can be applied to multi-wavelength system, can to a plurality of wavelength channels, be processed simultaneously.Simultaneously, this utility model does not relate to complicated structure, only adopt the communication apparatus of standard, not only can realize the optical-fiber wireless single-side band modulation, and can significantly reduce the CSR of optical fiber link, reduce the vibration amplitude of fading of optical-fiber wireless signal power with the Transmission Fibers length variations, promoted the optical fiber link transmission performance.
The accompanying drawing explanation
The wireless single-side band modulation system schematic of a kind of multi-wavelength optical fiber of Fig. 1.
Fig. 2 is sawtooth waveforms spectral filter transmission spectrum schematic diagram periodically.
The mono-wavelength continuous-wave laser of Fig. 3 array output spectrum schematic diagram.
The mono-wavelength MZ Mach-Zehnder output of Fig. 4 double-sideband modulation spectrum schematic diagram.
The mono-wavelength period sawtooth waveforms of Fig. 5 spectral filter output single-side band modulation spectrum schematic diagram.
Fig. 62 wavelength continuous-wave laser array output spectrum schematic diagrames.
Fig. 72 wavelength MZ Mach-Zehnder output double-sideband modulation spectrum schematic diagrames.
Fig. 82 wavelength period sawtooth waveforms spectral filter output single-side band modulation spectrum schematic diagrames.
Fig. 94 wavelength continuous-wave laser array output spectrum schematic diagrames.
Figure 10 4 wavelength MZ Mach-Zehnder output double-sideband modulation spectrum schematic diagrames.
Figure 11 4 wavelength period sawtooth waveforms spectral filter output single-side band modulation spectrum schematic diagrames.
Embodiment
Below in conjunction with accompanying drawing 1 to 11, the wireless single-side band modulation system of a kind of multi-wavelength optical fiber is further described.
The wireless single-side band modulation system of a kind of multi-wavelength optical fiber, this system comprises continuous-wave laser array 1, bipolar electrode MZ Mach-Zehnder 2, sinusoidal wave local oscillator 3,180 degree power splitters 4, bias voltage source 5, periodicity sawtooth waveforms spectral filter 6, Transmission Fibers 7, photoelectric detector 8.
Concrete connected mode is:
The light output end of continuous-wave laser array 1 connects the light input end of bipolar electrode MZ Mach-Zehnder 2, the electrical input of the electricity output termination 180 degree power splitters 4 of sinusoidal wave local oscillator 3, the first electricity that the electric output port 41 of 180 degree of 180 degree power splitters 4 connects bipolar electrode MZ Mach-Zehnder 2 drives port 21, the second electricity that the electric output port 42 of 0 degree of 180 degree power splitters 4 connects bipolar electrode MZ Mach-Zehnder 2 drives port 22, the voltage bias port 23 of the electricity output termination bipolar electrode MZ Mach-Zehnder 2 of bias voltage source 5, the light output end of bipolar electrode MZ Mach-Zehnder 2 connects the periodically light input end of sawtooth waveforms spectral filter 6, periodically the light output end of sawtooth waveforms spectral filter 6 connects Transmission Fibers 7 inputs, the light input end of Transmission Fibers 7 output termination photoelectric detectors 8.
The single wavelength of continuous-wave laser array 1 output is set, and the output light frequency is 193.4THz, and its output spectrum schematic diagram as shown in Figure 3;
Regulate the output voltage V of bias voltage source 5
Bias, make V
Bias=0V, be offset to the maximum transmitted point by bipolar electrode MZ Mach-Zehnder 2;
Regulate sinusoidal wave local oscillator 3 output sinusoidal signal frequency f=30GHz, and peak-to-peak value amplitude V
p-p=3.6012V, make the index of modulation
, V wherein
πThe half-wave voltage that=4V is bipolar electrode MZ Mach-Zehnder 2; At this moment bipolar electrode MZ Mach-Zehnder 2 is exported the double-sideband modulation signals, and its frequency spectrum as shown in Figure 3;
After passing through periodicity sawtooth waveforms spectral filter 5 by the double-sideband signal of bipolar electrode MZ Mach-Zehnder 2 outputs, can obtain single sideband modulated signal, periodically as shown in Figure 2, the single wavelength single sideband modulated signal spectrum obtained as shown in Figure 4 for the spectrum schematic diagram of sawtooth waveforms spectral filter 5.
The wireless single-side band modulation system of a kind of multi-wavelength optical fiber, this system comprises continuous-wave laser array 1, bipolar electrode MZ Mach-Zehnder 2, sinusoidal wave local oscillator 3,180 degree power splitters 4, bias voltage source 5, periodicity sawtooth waveforms spectral filter 6, Transmission Fibers 7, photoelectric detector 8.
Concrete connected mode is:
The light output end of continuous-wave laser array 1 connects the light input end of bipolar electrode MZ Mach-Zehnder 2, the electrical input of the electricity output termination 180 degree power splitters 4 of sinusoidal wave local oscillator 3, the first electricity that the electric output port 41 of 180 degree of 180 degree power splitters 4 connects bipolar electrode MZ Mach-Zehnder 2 drives port 21, the second electricity that the electric output port 42 of 0 degree of 180 degree power splitters 4 connects bipolar electrode MZ Mach-Zehnder 2 drives port 22, the voltage bias port 23 of the electricity output termination bipolar electrode MZ Mach-Zehnder 2 of bias voltage source 5, the light output end of bipolar electrode MZ Mach-Zehnder 2 connects the periodically light input end of sawtooth waveforms spectral filter 6, periodically the light output end of sawtooth waveforms spectral filter 6 connects Transmission Fibers 7 inputs, the light input end of Transmission Fibers 7 output termination photoelectric detectors 8.
2 wavelength of continuous-wave laser array 1 output are set, and the output light frequency is respectively 193.4THz, 193.7934THz, and its output spectrum schematic diagram as shown in Figure 6;
Regulate the output voltage V of bias voltage source 5
Bias, make V
Bias=0V, be offset to the maximum transmitted point by bipolar electrode MZ Mach-Zehnder 2;
Regulate sinusoidal wave local oscillator 3 output sinusoidal signal frequency f=30GHz, and peak-to-peak value amplitude V
p-p=3.6012V, make the index of modulation
, V wherein
πThe half-wave voltage that=4V is bipolar electrode MZ Mach-Zehnder 2; At this moment bipolar electrode MZ Mach-Zehnder 2 is exported the double-sideband modulation signals, and its frequency spectrum as shown in Figure 7;
After passing through periodicity sawtooth waveforms spectral filter 5 by the double-sideband signal of bipolar electrode MZ Mach-Zehnder 2 outputs, can obtain single sideband modulated signal, periodically as shown in Figure 2, the 2 wavelength single sideband modulated signal spectrum that obtain as shown in Figure 8 for the spectrum schematic diagram of sawtooth waveforms spectral filter 5.
The wireless single-side band modulation system of a kind of multi-wavelength optical fiber, this system comprises continuous-wave laser array 1, bipolar electrode MZ Mach-Zehnder 2, sinusoidal wave local oscillator 3,180 degree power splitters 4, bias voltage source 5, periodicity sawtooth waveforms spectral filter 6, Transmission Fibers 7, photoelectric detector 8.
Concrete connected mode is:
The light output end of continuous-wave laser array 1 connects the light input end of bipolar electrode MZ Mach-Zehnder 2, the electrical input of the electricity output termination 180 degree power splitters 4 of sinusoidal wave local oscillator 3, the first electricity that the electric output port 41 of 180 degree of 180 degree power splitters 4 connects bipolar electrode MZ Mach-Zehnder 2 drives port 21, the second electricity that the electric output port 42 of 0 degree of 180 degree power splitters 4 connects bipolar electrode MZ Mach-Zehnder 2 drives port 22, the voltage bias port 23 of the electricity output termination bipolar electrode MZ Mach-Zehnder 2 of bias voltage source 5, the light output end of bipolar electrode MZ Mach-Zehnder 2 connects the periodically light input end of sawtooth waveforms spectral filter 6, periodically the light output end of sawtooth waveforms spectral filter 6 connects Transmission Fibers 7 inputs, the light input end of Transmission Fibers 7 output termination photoelectric detectors 8.
4 wavelength of continuous-wave laser array 1 output are set, and the output light frequency is respectively 193.4THz, 193.7934THz, 194.1861THz, 194.5790THz, and its output spectrum schematic diagram as shown in Figure 9;
Regulate the output voltage V of bias voltage source 5
Bias, make V
Bias=0V, be offset to the maximum transmitted point by bipolar electrode MZ Mach-Zehnder 2;
Regulate sinusoidal wave local oscillator 3 output sinusoidal signal frequency f=30GHz, and peak-to-peak value amplitude V
p-p=3.6012V, make the index of modulation
, V wherein
πThe half-wave voltage that=4V is bipolar electrode MZ Mach-Zehnder 2; At this moment bipolar electrode MZ Mach-Zehnder 2 is exported the double-sideband modulation signals, and its frequency spectrum as shown in figure 10;
After passing through periodicity sawtooth waveforms spectral filter 5 by the double-sideband signal of bipolar electrode MZ Mach-Zehnder 2 outputs, can obtain single sideband modulated signal, periodically as shown in Figure 2, the 4 wavelength single sideband modulated signal spectrum that obtain as shown in figure 11 for the spectrum schematic diagram of sawtooth waveforms spectral filter 5.
Claims (1)
1. the wireless single-side band modulation system of multi-wavelength optical fiber is characterized in that: this system comprises continuous-wave laser array (1), bipolar electrode MZ Mach-Zehnder (2), sinusoidal wave local oscillator (3), 180 degree power splitters (4), bias voltage source (5), periodically sawtooth waveforms spectral filter (6), Transmission Fibers (7), photoelectric detector (8);
Connected mode between described device is:
The light output end of continuous-wave laser array (1) connects the light input end of bipolar electrode MZ Mach-Zehnder (2), the electrical input of the electricity output termination 180 degree power splitters (4) of sinusoidal wave local oscillator (3), the first electricity that the 180 electric output ports of degree (41) of 180 degree power splitters (4) connect bipolar electrode MZ Mach-Zehnder (2) drives port (21), the second electricity that the 0 electric output port of degree (42) of 180 power splitters (4) connects bipolar electrode MZ Mach-Zehnder (2) drives port (22), the voltage bias port (23) of the electricity output termination bipolar electrode MZ Mach-Zehnder (2) of bias voltage source (5), the light output end of bipolar electrode MZ Mach-Zehnder (2) connects the periodically light input end of sawtooth waveforms spectral filter (6), periodically the light output end of sawtooth waveforms spectral filter (6) connects Transmission Fibers (7) input, the light input end of Transmission Fibers (7) output termination photoelectric detector (8).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043526A (en) * | 2015-05-27 | 2015-11-11 | 浙江大学 | Vibration sensing device based on photoelectric oscillator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105043526A (en) * | 2015-05-27 | 2015-11-11 | 浙江大学 | Vibration sensing device based on photoelectric oscillator |
| CN105043526B (en) * | 2015-05-27 | 2018-02-23 | 浙江大学 | A kind of vibration sensor based on optical-electronic oscillator |
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Granted publication date: 20131204 Termination date: 20160513 |