CN103529568B - Based on the rectangular light filter system of stimulated Brillouin scattering effect - Google Patents
Based on the rectangular light filter system of stimulated Brillouin scattering effect Download PDFInfo
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- CN103529568B CN103529568B CN201310497106.2A CN201310497106A CN103529568B CN 103529568 B CN103529568 B CN 103529568B CN 201310497106 A CN201310497106 A CN 201310497106A CN 103529568 B CN103529568 B CN 103529568B
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Abstract
The invention discloses a kind of rectangular light filter system based on stimulated Brillouin scattering effect, AWG (Arbitrary Waveform Generator) (AWG) is utilized to produce electric signal and control the amplitude of each frequency content of electric signal, and then the object controlling pump light shape can be reached, finally obtain the gain spectral of controlled shape.By carrying out FEEDBACK CONTROL to the measurement of gain spectral, top flat, rectangular filter characteristic that edge is precipitous finally can be obtained.After obtaining rectangle gain spectral, feedback mechanism just completes task, and system can be used for carrying out filtering to actual signal.Bandwidth and the operation wavelength of this rectangular light wave filter are all adjustable, bandwidth reaches GHz magnitude, solve traditional passive optical filters bandwidth in the not precipitous problem of below 10GHz negative edge, overcome the problems such as other the wave filter negative edge based on stimulated Brillouin scattering effect is precipitous not or bandwidth is too little simultaneously.
Description
Technical field
The present invention relates to optical fiber communication class, particularly relate to a kind of rectangular light filter system based on stimulated Brillouin scattering effect.
Background technology
In the demultiplexing and microwave photon signal transacting of OFDM (OFDM), the crosstalk of adjacent channel can affect the quality of signal.In order to reduce this crosstalk, need a top flat and the narrow-band optical filter of the precipitous similar rectangle in edge.
More existing narrow-band optical filter technology at present, comprise the Fabry Perot chamber of cascade, based on the commercial wave filter of liquid crystal on silicon 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: the edge steep of transmission curve as an optical filter, by cascade, can be improved in Fabry Paro chamber.Through finding existing literature search, document [AlboonSA, LindquistRG.Flattopliquidcrystaltunablefilterusingcouple dFabry-Perotcavities [J] .Opticsexpress, 2008, 16 (1): 231-236.] (people's " utilizing the liquid crystal tunable top flat wave filter in cascade Fabry Paro chamber " such as AlboonSA, 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 multiple Fabry Paro chamber significantly can promote the flatness of passband and reduce shake simultaneously.The program 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 scenario, the bandwidth of wave filter cannot accomplish below 10GHz, cannot be applied to the demand compared with narrow bandwidth.
Such as, for based on liquid crystal on silicon: there is commercial optical filter scheme is at present 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, such steep is enough to obtain good result, but for the filtering demands of GHz magnitude, such negative edge is still precipitous not, larger on the impact of signal.
Active filter for based on SBS: in order to obtain the optical filter of GHz magnitude bandwidth, has some schemes to propose active optical filter based on SBS effect.Through finding the retrieval of existing document, document [ZadokA, EyalA, TurM.Gigahertz-wideopticallyreconfigurablefiltersusingst imulatedBrillouinscattering [J] .Journaloflightwavetechnology, 2007, 25 (8): 2168-2174.] (people's " GHz bandwidth light reconfigurable filter based on stimulated Brillouin scattering " such as ZadokA, lightwave technology magazine, page number 2168-2174, 2007) propose one in utilize pumping to warble to control Brillouin's process, thus obtain the scheme of the adjustable filter of GHz bandwidth.Obtain the wave filter of 1.3GHz-2.5GHz bandwidth in experiment, side mode suppression ratio reaches 30dB.But the shortcoming of the program is the filter skirt obtained to decline gently, precipitous not, may introduce the impact of adjacent sideband in actual applications, reduce 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, the filter system that wave filter negative edge is precipitous simultaneously.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, filter transfer curve that edge is precipitous.Mode by FEEDBACK CONTROL in the present invention controls pump light, thus controls the shape of wave filter.While 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) exports electric signal; The electric signal that described AWG (Arbitrary Waveform Generator) exports is modulated on the light signal that described laser instrument sends by described photomodulator; Light signal after modulation is undertaken by described Erbium-Doped Fiber Amplifier (EDFA) amplifying the first port being input to described circulator as pump light, and exports from the second port of described circulator; 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 exports the output signal of described system.
Further, described SBS gain media is optical fiber.
Further, described Operation system setting is for passing through feedback mechanism, the gain spectral that pump signal produces in described SBS gain media is fed back to described AWG (Arbitrary Waveform Generator), the described AWG (Arbitrary Waveform Generator) of corresponding adjustment, and then adjust described pump light, control the shape of the gain spectral of described system, realize 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 the electric signal that can produce different frequency composition, carries out Digital Control to the power of the electric signal of each frequency content simultaneously.
Further, the output signal frequency of the different frequency composition of described AWG (Arbitrary Waveform Generator) generation 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 guides optical propagation direction, exports from the light signal of the first port input of described circulator from the second port of described circulator, exports from the light of the second port input of described circulator from the 3rd port 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 the input light exceeding Brillouin threshold can produce brillouin gain in the other direction.
In the present invention, pump light is that electric signal by being exported by AWG is modulated on light carrier and produces.AWG can produce the electric signal comprising multiple frequency content, and wherein the amplitude of each frequency content all can Digital Control.By controlling AWG output signal, the corresponding power of the pump light spectral line after modulating can be controlled, and then control corresponding gain spectral.After generation pump light, by circulator, pump light is inputted in one section of optical fiber, thus 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 being in brillouin gain district just obtains significant amplification, reaches the effect of filtering.
In order to ensure the shape of wave filter, first need the measurement carrying out filter shape with detection light.What now the optical fiber other end inputted is detection light, compares, can obtain the filtering characteristic of wave filter before and after being exaggerated detection light.Utilization obtains gain spectral information and carries out feedback compensation control to AWG signal, carries out certain adjustment to pump light, and then the shape of ride gain spectrum, finally can obtain rectangular filter.After ensure that filter shape, just can this wave filter being used in filtering application, processing needing the signal of filtering.
The present invention carries out amplification by stimulated Brillouin scattering effect to the frequency content of light signal and realizes active filtering, gain spectral broadening is realized by carrying out multifrequency intensity modulated to Brillouin's pumping, thus realize wideband filtered, the independent brillouin gain spectrum controlling to obtain rectangle is carried out to each frequency content of electric signal, the multiline pumping of singlet gain spectral bandwidth is less than or equal to by interval, produce gain spectral and obtain continuous print gain spectral after superposing, bandwidth is expanded; Introduce feedback control mechanism, directly measurement is carried out and FEEDBACK CONTROL to gain spectral, and finally obtain rectangle gain spectral, thus eliminate the measurement links of pumping, once obtain rectangle gain spectral by FEEDBACK CONTROL, system does not just need to proceed FEEDBACK CONTROL, and directly can be used as rectangular filter.
Compared with prior art, the present invention has remarkable advantage:
1) while guarantee filter curve top flat, negative edge is precipitous, achieves 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, and the bandwidth of corresponding change gain spectral.
Be described further below with reference to the technique effect of accompanying drawing to design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully.
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 brillouin gain spectrum curve map corresponding to the multiline pumping of corresponding diagram 2;
Fig. 4 is the frequency-power of the pumping to Fig. 2 correction;
Fig. 5 is brillouin gain spectrum curve map corresponding to the pumping of corresponding diagram 4;
Fig. 6 is the structural representation of the rectangular filter system based on stimulated Brillouin scattering effect in the present invention's better enforcement;
Fig. 7 is the block diagram of the feedback control mechanism of the rectangular filter system based on stimulated Brillouin scattering effect in the present invention's better enforcement;
Fig. 8 ~ Figure 11 is the result curve under the filter system 1GHz bandwidth in the present invention's better enforcement,
Fig. 8 be in a preferred embodiment of the present invention in the spectrogram of detectable signal of input;
Fig. 9 be correspond to the component frequency composition of Fig. 8 be exaggerated after detectable signal;
Figure 10 be correspond to Fig. 8 and Fig. 9 amplification before and after signal detected by beat frequency and subtract each other the gain spectral result obtained;
Figure 11 is the gain spectral result utilizing feedback mechanism finally to obtain corresponding to Fig. 8 and Fig. 9;
Figure 12 ~ Figure 17 is the gain spectral result obtained in better enforcement median filter system different bandwidth situation of the present invention, the gain spectral curve measured 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 exceedes the Brillouin threshold corresponding to this section of optical fiber, SBS will transfer to most power input in backward stokes wave.This effect also can be used for amplification frequency and equal the signal of Brillouin shift amount relative to pump frequency, 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, multiline pumping gain spectral is needed to superpose.
Fig. 2 ~ Fig. 5 is the gain spectral shape of multiline pumping and correspondence, and the interval between pumping is less than 30MHz.When the multiline pumping gain spectral superposition of constant amplitude, the gain spectral of top flat can be produced, as shown in Figure 3.But due to the superposition amount that edge is a half compared to 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, based on stimulated Brillouin scattering effect rectangular filter system as shown in Figure 6.Wherein, laser instrument 1 is as signal carrier, by modulator 2, the output electric signal of AWG3 is modulated on light, to modulation after light signal amplify as pump light by EDFA4, and one section of optical fiber of circulator 2 port is connected by 1 port input of circulator 5, thus at the reverse generation brillouin gain of optical fiber, need the signal of filtering to input to 2 ports of circulator from optical fiber, and export (1 port of circulator, 2 ports and 3 ports are respectively the first port of circulator, the second port and the 3rd port) from 3 ports of circulator.In the present embodiment, the operation wavelength of laser instrument 1 is set to 1552nm, power is about 10dBm, photomodulator 2 is Mach zehnder modulators, the output signal frequency interval of the different frequency composition of AWG3 is set to 20MHz, the amplification of EDFA4 exports and is about 18dBm, the general single mode fiber of what optical fiber adopted is 25km.
In the present embodiment, in order to 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.Namely at the input end input detectable signal of optical fiber, the gain spectral that the detectable signal inputted from described optical fiber is produced by filter system is fed 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 the result after leaching a sideband after non-baseband modulation, as shown in Figure 8.A part for the right band after modulation is just in time within the scope of the gain spectral of pump light generation, thus 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, at output terminal by Photoelectric Detection, can obtain the frequency spectrum with the carrier wave beat frequency in detectable signal.
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 that AWG exports.Here 1GHz bandwidth is set to 50,50*20MHz=1GHz by AWG being exported spectral line, achieves 1GHz bandwidth.Fig. 8 is the spectrum of detectable signal, and Fig. 9 is the spectrum that a part for detection light obtains after the amplification of brillouin effect, and Figure 10 is the electricity spectrum result of detection light by obtaining after Photoelectric Detection, and Figure 11 is by the testing result of the detection light after partly amplifying.Electricity spectrum result after beat frequency can be seen, when the initial AWG using spectrum distribution more smooth exports as modulation signal, the gain spectral obtained is very uneven in fact, and chief reason should be that the non-linear of the system such as electric amplifier and modulator causes.After by feedback compensation control several times, obtain the gain spectral result in Figure 11, can see that the flatness of gain spectral obtains 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 that corresponding AWG exports electricity spectrum, is an irregular distribution shape, is difficult to draw such input in advance by calculating, this also illustrates the importance of feedback control mechanism.
It should be noted that Figure 12 ~ Figure 17 is the gain spectral curve measured in different bandwidth situation.Achieve in experiment from 40MHz (2 spectral line pumpings) until 1.5GHz (75 spectral line pumpings) bandwidth rectangle gain spectral.Namely the bandwidth of this wave filter is adjustable, and the precision that bandwidth controls can reach 20MHz.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of 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 (9)
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) exports electric signal; The electric signal that described AWG (Arbitrary Waveform Generator) exports is modulated on the light signal that described laser instrument sends by described photomodulator; Light signal after modulation is undertaken by described Erbium-Doped Fiber Amplifier (EDFA) amplifying the first port being input to described circulator as pump light, and exports from the second port of described circulator; 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 exports the output signal of described system;
Described Operation system setting is for passing through feedback mechanism, the gain spectral that pump signal produces in described SBS gain media is fed back to described AWG (Arbitrary Waveform Generator), the described AWG (Arbitrary Waveform Generator) of corresponding adjustment, and then adjust described pump light, control the shape of the gain spectral of described system, realize rectangular filter.
2. rectangular filter system as claimed in claim 1, it 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 feedback mechanism works offline, the online filtering of described rectangular filter system.
4. rectangular filter system as claimed in claim 1, it is characterized in that, described AWG (Arbitrary Waveform Generator) is set to the electric signal that can produce different frequency composition, carries out Digital Control to the power of the electric signal of each frequency content simultaneously.
5. rectangular filter system as claimed in claim 4, 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.
6. rectangular filter system as claimed in claim 1, it is characterized in that, the operation wavelength of described laser instrument is C+L wave band.
7. rectangular filter system as claimed in claim 1, it is characterized in that, described photomodulator is Mach zehnder modulators.
8. rectangular filter system as claimed in claim 1, it is characterized in that, described Erbium-Doped Fiber Amplifier (EDFA) is gain of light module.
9. rectangular filter system as claimed in claim 1, it is characterized in that, described circulator guides optical propagation direction, export from the second port of described circulator from the light signal of the first port input of described circulator, export from the 3rd port of described circulator from the light of the second port input of described circulator.
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| CN103091932A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | Single-band-pass microwave photon filter with super-wide tuning range |
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Non-Patent Citations (6)
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| Avi Zadok,et al..Gigahertz-Wide Optically Reconfi * |
| B. Vidal,et al..Tunable and reconfi * |
| gurable Filters Using Stimulated Brillouin Scattering.《JOURNAL OF LIGHTWAVE TECHNOLOGY》.2007,第25卷(第8期),第2170-2171页及图5. * |
| gurable photonic microwave fi * |
| lter based on stimulated Brillouin scattering.《OPTICS LETTERS》.2007,第32卷(第1期),全文. * |
| Narrowband optical filter, with a variable transmission spectrum, using stimulated Brillouin scattering in optical fiber;Takuo Tanemura,et al.;《 OPTICS LETTERS》;20020901;第27卷(第17期);全文 * |
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