CN103529568A - Rectangular optical filter system based on stimulated brillouin scattering effect - Google Patents
Rectangular optical filter system based on stimulated brillouin scattering effect Download PDFInfo
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- CN103529568A CN103529568A CN201310497106.2A CN201310497106A CN103529568A CN 103529568 A CN103529568 A CN 103529568A CN 201310497106 A CN201310497106 A CN 201310497106A CN 103529568 A CN103529568 A CN 103529568A
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Abstract
The invention discloses a rectangular optical filter system based on a stimulated brillouin scattering effect. An arbitrary waveform generator (AWG) is used for generating electric signals and controlling the amplitude of all frequency components of the electric signals so that the purpose of controlling the shape of pump light can be achieved, and lastly gain spectrum controllable in shape is obtained. Rectangular filter properties with flat top and sharp edges can be finally obtained by measuring the gain spectrum and carrying out feedback control. After the rectangular gain spectrum is obtained, a feedback mechanism completes tasks, and the system can be used for carrying out filtering on real signals. The bandwidth and the working wavelength of the rectangular optical filter are both adjustable, the bandwidth reaches the GHz magnitude, the problem that falling edge is not sharp when the bandwidth of a traditional passive optical filter is lower than 10 GHz is solved, and meanwhile the problem that the falling edge of other filters based on the stimulated brillouin scattering effect is not sharp enough or the bandwidth is too small is solved.
Description
Technical field
The present invention relates to optical fiber communication class, relate in particular to a kind of rectangular light filter system based on stimulated Brillouin scattering effect.
Background technology
In the demultiplexing and the processing of microwave photon signal of OFDM (OFDM), crosstalking of adjacent channel can affect the quality of signal.In order to reduce this crosstalking, need the narrow-band optical filter of the similar rectangle that a top flat and edge are precipitous.
Current more existing narrow-band optical filter technology, comprise the Fabry Perot chamber, the commercial wave filter based on liquid crystal on silicon of cascade and based on SBS(stimulated Brillouin scattering effect) active filter etc., but all there is certain problem in these technology.
Fabry Perot chamber for cascade: Fabry Paro chamber can be used as an optical filter, by cascade, can improve the precipitous degree in edge of transmission curve.Through existing literature search is found, document [Alboon S A, Lindquist R G.Flat top liquid crystal tunable filter using coupled Fabry-Perot cavities[J] .Optics express, 2008, 16 (1): 231-236.] (people's " utilizing the liquid crystal tunable top flat wave filter in cascade Fabry Paro chamber " such as Alboon S A, optics letter, page number 231-236, 2008) a kind of adjustable light wave-filter of the Fabry Paro chamber based on cascade is proposed in, the cascade in a plurality of Fabry Paros chamber can significantly promote the flatness of passband and reduce shake simultaneously.This scheme can obtain the optical filter of 100GHz, and by the control of liquid crystal, the tunable range of this wave filter can reach 172nm.But in this scheme, the bandwidth of wave filter cannot accomplish, below 10GHz, cannot be applied to the demand compared with narrow bandwidth.
For example, for based on liquid crystal on silicon: having commercial optical filter scheme is at present the adjustable filter based on liquid crystal on silicon, the XTA-50 adjustable filter of yenisata company.The bandwidth adjustable extent of this wave filter is from 32pm (4GHz) to 5nm, and operation wavelength is from 1260nm to 1650nm, and negative edge steepness can reach 800dB/nm.In the application larger to filtering bandwidth, so precipitous degree is enough to obtain good result, but for the filtering demand of GHz magnitude, such negative edge is still precipitous not, larger on the impact of signal.
For the active filter based on SBS: in order to obtain the optical filter of GHz magnitude bandwidth, have some schemes to propose the active optical filter based on SBS effect.Through the retrieval of existing document is found, document [Zadok A, Eyal A, Tur M.Gigahertz-wide optically reconfigurable filters using stimulated Brillouin scattering[J] .Journal of lightwave technology, 2007, 25 (8): 2168-2174.] (people's " GHz bandwidth light restructural wave filter based on stimulated Brillouin scattering " such as Zadok A, lightwave technology magazine, page number 2168-2174, 2007) in, propose a kind ofly to utilize pumping to warble Brillouin's process is controlled, thereby obtain the scheme of the adjustable filter of GHz bandwidth.The wave filter that has obtained 1.3GHz-2.5GHz bandwidth in experiment, side mode suppression ratio reaches 30dB.But the shortcoming of this scheme is the wave filter edge obtaining to decline gently, precipitous not, may introduce in actual applications the impact of adjacent sideband, reduces the quality of signal.
Summary of the invention
Because the above-mentioned defect of prior art, technical matters to be solved by this invention provides a kind of bandwidth adjustable, meets the requirement larger to filter bandwidht, simultaneously the precipitous filter system of wave filter negative edge.In view of this consideration, the invention provides a kind of rectangular filter system based on stimulated Brillouin scattering effect, its objective is and solve the defect that existing optical filter technology cannot obtain top flat, wave filter transmission curve that edge is precipitous.Mode by FEEDBACK CONTROL in the present invention is controlled pump light, thereby controls the shape of wave filter.When realizing rectangular filter curve, the bandwidth of wave filter and operation wavelength are all adjustable, and the tuning precision of bandwidth can reach 20MHz magnitude.
For achieving the above object, the invention provides a kind of rectangular filter system based on stimulated Brillouin scattering effect, comprise laser instrument, photomodulator, AWG (Arbitrary Waveform Generator) (AWG), Erbium-Doped Fiber Amplifier (EDFA) (EDFA), circulator and SBS gain media, described circulator has the first port, the second port and the 3rd port; Described laser instrument sends light signal, as signal carrier; Described AWG (Arbitrary Waveform Generator) output electrical signals; Described photomodulator is modulated to the electric signal of described AWG (Arbitrary Waveform Generator) output on the light signal that described laser instrument sends; Light signal after modulation amplifies the first port that is input to described circulator as pump light by described Erbium-Doped Fiber Amplifier (EDFA), and exports from the second port of described circulator; The second port of described circulator is connected with described SBS gain media, and described SBS gain media produces SBS, and the input signal of described system transmits along described SBS gain media, and the 3rd port of described circulator is exported the output signal of described system.
Further, described SBS gain media is optical fiber.
Further, described system is set to pass through feedback mechanism, the gain spectral that pump signal is produced in described SBS gain media feeds back to described AWG (Arbitrary Waveform Generator), the described AWG (Arbitrary Waveform Generator) of corresponding adjustment, and then adjust described pump light, the shape of controlling the gain spectral of described system, realizes rectangular filter.
Further, described feedback mechanism works offline, the online filtering of described rectangular filter system.
Further, described AWG (Arbitrary Waveform Generator) is set to produce the electric signal of different frequency composition, the power of the electric signal of each frequency content is carried out to Digital Control simultaneously.
The output signal frequency of the different frequency composition that further, described AWG (Arbitrary Waveform Generator) produces is spaced apart the SBS bandwidth of gain fibre.
Further, the operation wavelength of described laser instrument is C+L wave band.
Further, the operation wavelength of described laser instrument is 1530～1625nm.
Further, described photomodulator is Mach zehnder modulators.
Further, described Erbium-Doped Fiber Amplifier (EDFA) is gain of light module.
Further, described circulator guiding optical propagation direction, the light signal of inputting from the first port of described circulator is from the second port output of described circulator, and the light of inputting from the second port of described circulator is from the 3rd port output of described circulator.
Further, described optical fiber is single-mode fiber.
Further, described optical fiber is the single-mode fiber of length 25km, and fiber lengths increases can reduce Brillouin threshold, and can produce in the other direction brillouin gain over the input light of Brillouin threshold.
In the present invention, pump light is by the electric signal of AWG output is modulated on light carrier and is produced.AWG can produce the electric signal that comprises a plurality of frequency contents, and wherein the amplitude of each frequency content all can Digital Control.By AWG output signal is controlled, can control the corresponding power of pump light spectral line after modulation, and then control corresponding gain spectral.After producing pump light, by circulator by one section of optical fiber of pump light input, thereby at the reverse generation brillouin gain of optical fiber.Need the signal of filtering from another section of input of optical fiber, a part of signal in brillouin gain district has just obtained significant amplification, has reached the effect of filtering.
In order to guarantee the shape of wave filter, first need to carry out with detection light the measurement of filter shape.What now the optical fiber other end was inputted is to survey light, before and after detection light is exaggerated, compares, and can obtain the filtering characteristic of wave filter.Utilization obtains gain spectral information AWG signal is carried out to feedback compensation control, and pump light is carried out to certain adjustment, and then the shape of ride gain spectrum, finally can obtain rectangular filter.After having guaranteed filter shape, just can be by this wave filter for filtering application, to needing the signal of filtering to process.
The present invention amplifies to realize active filtering by stimulated Brillouin scattering effect to the frequency content of light signal, by being carried out to multifrequency intensity modulated, Brillouin's pumping realizes gain spectral broadening, thereby realize wideband filtered, each frequency content of electric signal is carried out to the independent brillouin gain spectrum that obtains rectangle of controlling, by interval, be less than or equal to the multiline pumping of singlet gain spectral bandwidth, produce gain spectral and superpose and obtain continuous gain spectral afterwards, bandwidth is expanded; Introduce feedback control mechanism, directly gain spectral is measured and FEEDBACK CONTROL, and finally obtain rectangle gain spectral, thereby saved the measurement links of pumping, once obtain rectangle gain spectral by FEEDBACK CONTROL, system does not just need to proceed FEEDBACK CONTROL, and can directly be used as rectangular filter.
Compared with prior art, the present invention has remarkable advantage:
1) when guaranteeing filter curve top flat, negative edge is precipitous, has realized the effect of rectangular filter curve.
2) operation wavelength and band wide tunable, by changing the operation wavelength of laser instrument, can obtain the gain spectral at different wave length place, simultaneously by increasing or reduce the number of pumping spectral line, the bandwidth of corresponding change gain spectral.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is brillouin gain spectral curve corresponding to singlet pumping;
Fig. 2 is the frequency-power of constant amplitude multiline pumping;
Fig. 3 is the brillouin gain corresponding to multiline pumping of corresponding diagram 2 line chart of setting a song to music;
Fig. 4 is the frequency-power to the pumping of Fig. 2 correction;
Fig. 5 is brillouin gain corresponding to the pumping of corresponding diagram 4 line chart of setting a song to music;
Fig. 6 is the structural representation of the rectangular filter system based on stimulated Brillouin scattering effect in better enforcement of the present invention;
Fig. 7 is the block diagram of the feedback control mechanism of the rectangular filter system based on stimulated Brillouin scattering effect in better enforcement of the present invention;
Fig. 8～Figure 11 is the result curve under the filter system 1GHz bandwidth in better enforcement of the present invention,
Fig. 8 is the spectrogram of the detectable signal of the input in a preferred embodiment of the present invention;
Fig. 9 is the detectable signal after being exaggerated corresponding to the component frequency composition of Fig. 8;
Figure 10 detects by beat frequency and subtracts each other the gain spectral result obtaining for the signal corresponding to before and after the amplification of Fig. 8 and Fig. 9;
Figure 11 is the gain spectral result of utilizing feedback mechanism finally to obtain corresponding to Fig. 8 and Fig. 9;
Figure 12～Figure 17 is the gain spectral result obtaining in better enforcement median filter system different bandwidth situation of the present invention, the gain spectral curve of measuring in corresponding 40MHz, 100MHz, 200MHz, 500MHz, 1GHz and 1.5GHz situation respectively.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described.
Fig. 1 is the brillouin gain spectrum of singlet pumping.Stimulated Brillouin scattering effect is a threshold effect, and when input optical power surpasses this section of corresponding Brillouin threshold of optical fiber, SBS will transfer to most power input in backward stokes wave.This effect also can be used for amplification frequency and with respect to pump frequency, equal the signal of Brillouin shift amount, and now pumping wave and input signal must transmit in the opposite direction in single-mode fiber.
The bandwidth of the brillouin gain spectrum of singlet is about 30MHz, is not suitable for general wave filter application scenario.In order to expand the bandwidth of gain spectral, need the stack of multiline pumping gain spectral.
Fig. 2～Fig. 5 is multiline pumping and corresponding gain spectral shape, and the interval between pumping is less than 30MHz.When the multiline pumping gain spectral of constant amplitude superposes, can produce the gain spectral of top flat, as shown in Figure 3.But due to the stack amount that edge is a half than center section, negative edge is steep not.If need the gain spectral that negative edge is very steep, need to revise pumping, as gain spectral corresponding in the pumping in Fig. 4 and Fig. 5.
In a preferred embodiment of the present invention, the rectangular filter system based on stimulated Brillouin scattering effect as shown in Figure 6.Wherein, laser instrument 1 is as signal carrier, by modulator 2, the output electrical signals of AWG3 is modulated on light, to modulation after light signal by EDFA4, amplify as pump light, and the 1 port input of passing through circulator 5 connects one section of optical fiber of circulator 2 ports, thereby the reverse generation brillouin gain at optical fiber, need the signal of filtering from optical fiber, to input to 2 ports of circulator, and export (1 port of circulator, 2 ports and 3 ports are respectively the first port, the second port and the 3rd port of circulator) from 3 ports of circulator.In the present embodiment, the operation wavelength of laser instrument 1 is made as 1552nm, power is about 10dBm, photomodulator 2 is Mach zehnder modulators, the output signal frequency interval of the different frequency composition of AWG3 is made as 20MHz, the amplification output of EDFA4 is about 18dBm, and what optical fiber adopted is the general single mode fiber of 25km.
In the present embodiment, for the gain spectral of adjustment System, adopt feedback mechanism to carry out off-line adjustment to system, Fig. 7 shows the feedback mechanism in the present embodiment.At the input end of optical fiber, input detectable signal, the gain spectral that detectable signal from described optical fiber input is produced by filter system feeds back to AWG (Arbitrary Waveform Generator), corresponding adjustment AWG (Arbitrary Waveform Generator), and then adjustment pump light, the shape of the gain spectral of control system, finally realizes rectangular filter.In the present embodiment, detectable signal is after non-baseband modulation, to leach a result after sideband, as shown in Figure 8.Within the scope of the gain spectral that a part for the right band after modulation just in time produces in pump light, thereby can be amplified.Meanwhile, the carrier wave of detectable signal remains, and the sideband in detectable signal is subject to before and after Brillouin amplification, can be at output terminal by Photoelectric Detection, obtain with detectable signal in the frequency spectrum of carrier wave beat frequency.
Fig. 8～Figure 11 is the experimental result in filter bandwidht 1GHz situation.In Figure 10 and Figure 11, upper left corner illustration is the signal of AWG output.The 1GHz bandwidth is here to be made as 50 by AWG being exported to spectral line, and 50*20MHz=1GHz, has realized 1GHz bandwidth.Fig. 8 is the spectrum of detectable signal, and Fig. 9 obtains the spectrum after the amplification of brillouin effect for surveying a part for light, and Figure 10 is for surveying light by the electricity spectrum result obtaining after Photoelectric Detection, and Figure 11 is for by the testing result of the detection light after partly amplifying.Electricity spectrum result after beat frequency can be seen, when the more smooth AWG of initial use spectrum distribution exports as modulation signal, the gain spectral obtaining is very uneven in fact, and chief reason should be that the non-linear of system such as electric amplifier and modulator cause.By after feedback compensation control several times, obtain the gain spectral result in Figure 11, can see that the flatness of gain spectral has obtained obvious improvement, three dB bandwidth and 10dB bandwidth are respectively 0.994GHz and 1.052GHz simultaneously, are rectangular shape substantially.Illustration in Figure 11 is corresponding AWG output electricity spectrum, is an irregular distribution shape, is difficult to draw in advance such input by calculating, and this has also illustrated the importance of feedback control mechanism.
It should be noted that Figure 12～Figure 17 is the gain spectral curve of measuring in different bandwidth situation.In experiment, realized from 40MHz (2 spectral line pumpings) until the rectangle gain spectral 1.5GHz (75 spectral line pumpings) bandwidth.The bandwidth of this wave filter is adjustable, and the precision that bandwidth is controlled can reach 20MHz.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area just can design according to the present invention be made many modifications and variations without creative work.Therefore, all technician in the art, all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. the rectangular filter system based on stimulated Brillouin scattering effect, it is characterized in that, comprise laser instrument, photomodulator, AWG (Arbitrary Waveform Generator), Erbium-Doped Fiber Amplifier (EDFA), circulator and SBS gain media, described circulator has the first port, the second port and the 3rd port; Described laser instrument sends light signal, as signal carrier; Described AWG (Arbitrary Waveform Generator) output electrical signals; Described photomodulator is modulated to the electric signal of described AWG (Arbitrary Waveform Generator) output on the light signal that described laser instrument sends; Light signal after modulation amplifies the first port that is input to described circulator as pump light by described Erbium-Doped Fiber Amplifier (EDFA), and exports from the second port of described circulator; The second port of described circulator is connected with described SBS gain media, and described SBS gain media produces SBS, and the input signal of described system transmits along described SBS gain media, and the 3rd port of described circulator is exported the output signal of described system.
2. rectangular filter system as claimed in claim 1, is characterized in that, described SBS gain media is optical fiber.
3. rectangular filter system as claimed in claim 1, it is characterized in that, described system is set to pass through feedback mechanism, the gain spectral that pump signal is produced in described SBS gain media feeds back to described AWG (Arbitrary Waveform Generator), the described AWG (Arbitrary Waveform Generator) of corresponding adjustment, and then adjust described pump light, and control the shape of the gain spectral of described system, realize rectangular filter.
4. rectangular filter system as claimed in claim 3, is characterized in that, described feedback mechanism works offline, the online filtering of described rectangular filter system.
5. rectangular filter system as claimed in claim 1, is characterized in that, described AWG (Arbitrary Waveform Generator) is set to produce the electric signal of different frequency composition, the power of the electric signal of each frequency content is carried out to Digital Control simultaneously.
6. rectangular filter system as claimed in claim 5, is characterized in that, the output signal frequency of the different frequency composition that described AWG (Arbitrary Waveform Generator) produces is spaced apart the SBS bandwidth of gain fibre.
7. rectangular filter system as claimed in claim 1, is characterized in that, the operation wavelength of described laser instrument is C+L wave band.
8. rectangular filter system as claimed in claim 1, is characterized in that, described photomodulator is Mach zehnder modulators.
9. rectangular filter system as claimed in claim 1, is characterized in that, described Erbium-Doped Fiber Amplifier (EDFA) is gain of light module.
10. rectangular filter system as claimed in claim 1, it is characterized in that, described circulator guiding optical propagation direction, the light signal of inputting from the first port of described circulator is from the second port output of described circulator, and the light of inputting from the second port of described circulator is from the 3rd port output of described circulator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110764174A (en) * | 2019-10-28 | 2020-02-07 | 中山大学 | Dielectric grating narrow-band filter and manufacturing method thereof |
| CN112513619A (en) * | 2018-09-10 | 2021-03-16 | 株式会社日立高新技术 | Spectrum correction device and spectrum correction method |
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| US20080175595A1 (en) * | 2007-01-23 | 2008-07-24 | Peter Dragic | Micropulse lidar transmitter based on a low-SBS erbium-doped silica fiber |
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| US20080175595A1 (en) * | 2007-01-23 | 2008-07-24 | Peter Dragic | Micropulse lidar transmitter based on a low-SBS erbium-doped silica fiber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112513619A (en) * | 2018-09-10 | 2021-03-16 | 株式会社日立高新技术 | Spectrum correction device and spectrum correction method |
| CN112513619B (en) * | 2018-09-10 | 2024-02-02 | 株式会社日立高新技术 | Spectrum correction device and spectrum correction method |
| CN110764174A (en) * | 2019-10-28 | 2020-02-07 | 中山大学 | Dielectric grating narrow-band filter and manufacturing method thereof |
| CN110764174B (en) * | 2019-10-28 | 2022-05-03 | 中山大学 | Dielectric grating narrow-band filter and manufacturing method thereof |
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