CN102253452A - Tunable microwave photon band pass filter based on multi-wavelength fiber laser - Google Patents
Tunable microwave photon band pass filter based on multi-wavelength fiber laser Download PDFInfo
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Abstract
The invention discloses a tunable microwave photon band pass filter based on a multi-wavelength fiber laser, belonging to the technical field of fiber-optical communication and signal processing. The tunable microwave photon band pass filter is structurally characterized in that: the output end of a pump source is connected with a port a of a wavelength division multiplexer; a port c of the wavelength division multiplexer is connected with the input end of an erbium-doped fiber; a port b of the wavelength division multiplexer is connected with a port b of a coupler I; a port a of the coupler I is connected with an ordinary single mode fiber; the port b and a port c of the coupler I are connected with a port a of the wavelength division multiplexer and a port a of a coupler II respectively; etc. Based on the multi-wavelength fiber laser, the tunable microwave photon band pass filter can be used for apodization by utilizing a birefringence fiber environment, and then realizes high side lobe suppression ratio by utilizing phase strength conversion (PM-IM). Compared with other microwave photon filters, the tunable microwave photon band pass filter has the advantages of simple structure, low cost, capability of realizing band pass filtration and higher side lobe suppression ratio, tunable band pass, capability of working stably at normal temperature, and the like.
Description
Technical field
The invention belongs to optical fiber communication and signal processing technology field, specifically, relate to the optical processing of radiofrequency signal.
Background technology
Microwave photon filter is the focus that current microwave photon is learned area research.Generally speaking microwave photon filter can be realized with two kinds of methods: the one, and coherent manner; The 2nd, non-coherent manner.Because light phase is subjected to the influence of surrounding environment easily, control ratio is difficulty, and present microwave photon signal Processing generally adopts incoherent mode to realize.Between the output of incoherent wave filter and the input radio frequency signal is linear relationship, is not subjected to the influence of surrounding environment to the light phase disturbance.Yet incoherent filtering system is the light intensity stack of signal, and the tap coefficient of wave filter is for just, and this makes microwave photon filter have significant limitation on function.Band is logical all to be difficult to realize with the optical tap of positive coefficient with Hi-pass filter, has limited filter transfer function greatly.The research work of various countries at present mainly concentrates on the novel filter construction of design to realize negative and multiple tap coefficient, frequency response that the Q value is higher, adjustability, restructural and bigger dynamic range etc.All these researchs all also are in the fundamental research stage, and many key technical problems wait to solve.Realize that microwave photon filter often needs to utilize laser array or utilizes spectrum cutting wideband light source, and the former cost is very high, though the latter has reduced cost owing to having introduced the performance that too much system noise has reduced wave filter.
The tunable microwave photon bandpass filter based on multi-wavelength tunable fiber laser and birefringence fiber ring mirror that this paper proposes utilizes the tunable multi-wavelength fiber laser as light source, realize the tuning of the free spectral range of microwave photon filter by regulating its wavelength interval, simultaneously, this paper has also introduced a birefringence fiber ring mirror and the multiwavelength laser that comes out from light source is carried out power has cut toe, can increase substantially the sidelobe rejection ratio (MSR) of microwave photon filter like this.
Summary of the invention
The objective of the invention is to realize the novel microwave photon bandpass filter structures of a kind of low cost, compact conformation, tunable, high sidelobe rejection ratio:
Comprise: pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, Polarization Controller 1, Polarization Controller 26, Polarization Controller 38 and Polarization Controller 4 12, the relevant isolator 5 of polarization, polarization maintaining optical fibre 1, polarization maintaining optical fibre 29 and polarization maintaining optical fibre 3 13, general single mode fiber 1 and general single mode fiber 2 17, coupling mechanism 1, coupling mechanism 2 14, phase-modulator 15 and photodetector 16; Pumping source 1 meets the port a of wavelength division multiplexer 2; The port c of wavelength division multiplexer 2 connects the input end of Er-doped fiber 3; The input end of the output termination Polarization Controller 1 of Er-doped fiber 3; The input end of the relevant isolator 5 of the output termination polarization of Polarization Controller 1; The input end of the output termination Polarization Controller 26 of the relevant isolator 5 of polarization; The input end of the output termination polarization maintaining optical fibre 1 of Polarization Controller 26; The input end of the output termination Polarization Controller 38 of polarization maintaining optical fibre 1; The input end of the output termination polarization maintaining optical fibre 29 of Polarization Controller 38; The input end of the output termination general single mode fiber 1 of polarization maintaining optical fibre 29; The port a of the output termination coupling mechanism 1 of general single mode fiber 1; The port b of coupling mechanism 1 meets the port b of wavelength division multiplexer 2; The port c of coupling mechanism 1 meets the port a of coupling mechanism 2 14; The port c of coupling mechanism 2 14 connects the input end of Polarization Controller 4 12; The input end of the output termination polarization maintaining optical fibre 3 13 of Polarization Controller 4 12; The port d of the output termination coupling mechanism 2 14 of polarization maintaining optical fibre 3 13; The port b of coupling mechanism 2 14 meets the port a of phase-modulator 15; The port c of phase-modulator 15 connects the input end of general single mode fiber 2 17; The input end of the output termination photodetector 16 of general single mode fiber 2 17; The port b of phase-modulator 15 is the rf inputs mouth; The output terminal of photodetector 16 is an output port.
Described general single mode fiber 1 is as the nonlinear polarization rotating media, and its length is between 3 km to 8 kms.
Described tunable microwave photon bandpass filter based on multi-wavelength optical fiber laser by regulating effective birefringence intensity that Polarization Controller 38 is regulated polarization maintaining optical fibre 1 and polarization maintaining optical fibre 29, thereby is regulated the wavelength interval of multi-wavelength optical fiber laser.
The length of described polarization maintaining optical fibre 3 13 is controlled the transmission spectrum of birefringence fiber ring mirror by regulating Polarization Controller 4 12 between 5 meters to 10 meters, make its move left and right.
Described Polarization Controller 4 12, polarization maintaining optical fibre 3 13 and coupling mechanism 2 14 are formed birefringence fiber ring mirror.
Described coupling mechanism 1 is the 10dB coupling mechanism, and coupling mechanism 2 14 is a three-dB coupler.
Described pumping source 1 is the pumping source of 980nm or 1480nm.
Beneficial effect of the present invention: the present invention produces the multiwavelength laser signal by using the tunable multi-wavelength fiber laser, realize the adjusting of wavelength interval and wavelength coverage by regulating Polarization Controller, thereby realize the adjusting of the free spectral range of microwave photon filter (FSR); Laser signal enters and includes the birefringence fiber ring mirror that Polarization Controller four and polarization maintaining optical fibre three and coupling mechanism two are formed then, the transition function of birefringence fiber ring mirror is the pectination spectrum, its three dB bandwidth can be by selecting suitable polarization maintaining optical fibre length adjustment, by regulating the Polarization Controller control pectination spectrum move left and right in the birefringence fiber ring mirror, thereby realize the coupling that multiwavelength laser and birefringence fiber ring mirror wave are long, thereby realize the toe of cutting the multiwavelength laser signal.Multiwavelength laser signal after cutting toe enters phase-modulator then, through being admitted to the general single mode fiber of some kms after the modulation of radiofrequency signal, realize the conversion (PM-IM) of phase modulation (PM), then through obtaining behind the photodetector through the radiofrequency signal after the Filtering Processing to intensity modulated.This invention is regulated the adjusting that the free spectral range of microwave photon filter is realized in the wavelength interval of multiple-wavelength laser by regulating Polarization Controller, realize the adjusting of multiwavelength laser intensity by the Polarization Controller of regulating in the birefringence fiber ring mirror, thereby increase the sidelobe rejection ratio of wave filter; Utilize phase-modulator and chromatic dispersion device to realize that phase modulation (PM) can realize the negative coefficient tap of wave filter to the conversion of intensity modulated, thereby realize bandpass filtering.
This invention realizes that cost is lower, have very big sidelobe rejection ratio, can realize bandpass filtering and the logical frequency of its band be adjustable, have good stability.
Description of drawings
Fig. 1 is the tunable microwave photon bandpass filter structures synoptic diagram based on multi-wavelength optical fiber laser of embodiments of the invention 1.
Among the figure: (1) pumping source, (2) wavelength division multiplexer, (3) Er-doped fiber, (4) Polarization Controller one, the relevant isolator of (5) polarization, (6) Polarization Controller two, (7) polarization maintaining optical fibre one, (8) Polarization Controller three, (9) polarization maintaining optical fibre two, (10) general single mode fiber one, (11) coupling mechanism one, (12) Polarization Controller four, (13) polarization maintaining optical fibre three, (14) coupling mechanism two, (15) phase-modulator, (16) photodetector, (17) general single mode fiber two
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
This high tunable microwave photon bandpass filter structures, it comprises: the pumping source 1 of 980nm or 1480nm, wavelength division multiplexer 2, Er-doped fiber 3, Polarization Controller 1, the relevant isolator 5 of polarization, Polarization Controller 26, Polarization Controller 38 and Polarization Controller 4 12, polarization maintaining optical fibre 1, polarization maintaining optical fibre 29 and polarization maintaining optical fibre 3 13, general single mode fiber 1 and general single mode fiber 2 17, coupling mechanism 1, coupling mechanism 2 14, phase-modulator 15 and photodetector 16.
Centre wavelength is the port a that the pumping source 1 of 980nm or 1480nm connects wavelength division multiplexer 2; The port c of wavelength division multiplexer 2 connects the input end of Er-doped fiber 3; The input end of the output termination Polarization Controller 1 of Er-doped fiber 3; The input end of the relevant isolator 5 of the output termination polarization of Polarization Controller 1; The input end of the output termination Polarization Controller 26 of the relevant isolator 5 of polarization; The input end of the output termination polarization maintaining optical fibre 1 of Polarization Controller 26; The input end of the output termination Polarization Controller 38 of polarization maintaining optical fibre 1; The input end of the output termination polarization maintaining optical fibre 29 of Polarization Controller 38; The input end of the output termination general single mode fiber 1 of polarization maintaining optical fibre 29; The port a of the output termination coupling mechanism 1 of general single mode fiber 1; The port b of coupling mechanism 1 meets the port b of wavelength division multiplexer 2; The port c of coupling mechanism 1 meets the port a of coupling mechanism 2 14; The port c of coupling mechanism 2 14 connects the input end of Polarization Controller 4 12; The input end of the output termination polarization maintaining optical fibre 3 13 of Polarization Controller 4 12; The port d of the output termination coupling mechanism 2 14 of polarization maintaining optical fibre 3 13; The port b of coupling mechanism 2 14 meets the port a of phase-modulator 15; The port c of phase-modulator 15 connects the input end of general single mode fiber 2 17; The input end of the output termination photodetector 16 of general single mode fiber 2 17; The port b of phase-modulator 15 is an input end; The output terminal of photodetector 16 is an output terminal.
As shown in Figure 1, Er-doped fiber 3 is as gain media, polarization maintaining optical fibre 1 and polarization maintaining optical fibre 29 are used for changing birefringence intensity in the chamber by regulating Polarization Controller 38, length is the nonlinear polarization rotation effect that one 10 of the general single mode fibers of 3～5km are used for increasing optical fiber, and Polarization Controller 1, Polarization Controller 26 and a relevant isolator 5 of polarization are used for changing the polarization state in the laser cavity and guarantee the unidirectional running of laser.Wavelength is that the laser of 980nm or 1480nm enters Er-doped fiber 3 through wavelength division multiplexer 2, and laser is clockwise unidirectional running in ring cavity, and the port c by coupling mechanism 1 exports at last.The nonlinear polarization rotation effect is the key of multi-wavelength output, can realize the adjusting of wavelength interval by regulating Polarization Controller 38.
Enter birefringence fiber ring mirror from the multiwavelength laser signal of the port c of coupling mechanism 1 output through coupling mechanism 2 14.Can realize the adjusting of birefringence fiber ring mirror transition function by regulating Polarization Controller 4 12, in the time of in each wavelength of multiwavelength laser all drops on passband of birefringence fiber ring mirror, just realize both couplings, can realize the toe of cutting multiwavelength laser.Enter phase-modulator 15 from the light signal of coupling mechanism 2 14 port b output, modulation through radiofrequency signal enters the general single mode fiber 2 17 that length is 10～50km, the general single mode fiber 2 17 here has two effects, the first realizes the conversion of phase modulation (PM) to intensity modulated, and it two is as dispersive medium the laser signal of each wavelength to be delayed time.Last flashlight is input to photodetector 16, and the signal of exporting from photodetector 16 passes through filtered radiofrequency signal exactly.
Select length be the general single mode fiber 1 of 3～5km in order to increase nonlinear polarization rotation effect, guarantee that the output power spectrum of multiwavelength laser is smooth and stable.The application of polarization maintaining optical fibre 1, polarization maintaining optical fibre 29 and Polarization Controller makes optical maser wavelength adjustable at interval, realizes the adjustable of microwave photon filter.Can regulate (windowing) to the multiwavelength laser output power by the birefringence fiber ring mirror that Polarization Controller 4 12, polarization maintaining optical fibre 3 13 and coupling mechanism 2 14 are formed, thereby improve the sidelobe rejection ratio of microwave photon filter greatly.Phase-modulator 15 and general single mode fiber 2 17 join together to realize the conversion of PM-IM, thereby realize bandpass filter.Wherein, coupling mechanism 1 is the 10dB coupling mechanism, and coupling mechanism 2 14 is a three-dB coupler.
Claims (7)
1. tunable microwave photon bandpass filter based on multi-wavelength optical fiber laser, it is characterized in that: it comprises: pumping source (1), wavelength division multiplexer (2), Er-doped fiber (3), Polarization Controller one (4), Polarization Controller two (6), Polarization Controller three (8) and Polarization Controller four (12), the polarization isolator (5) of being correlated with, polarization maintaining optical fibre one (7), polarization maintaining optical fibre two (9) and polarization maintaining optical fibre three (13), general single mode fiber one (10) and general single mode fiber two (17), coupling mechanism one (11), coupling mechanism two (14), phase-modulator (15) and photodetector (16); Pumping source (1) meets the port a of wavelength division multiplexer (2); The port c of wavelength division multiplexer (2) connects the input end of Er-doped fiber (3); The input end of the output termination Polarization Controller one (4) of Er-doped fiber (3); The input end of the relevant isolator (5) of the output termination polarization of Polarization Controller one (4); The be correlated with input end of output termination Polarization Controller two (6) of isolator (5) of polarization; The input end of the output termination polarization maintaining optical fibre one (7) of Polarization Controller two (6); The input end of the output termination Polarization Controller three (8) of polarization maintaining optical fibre one (7); The input end of the output termination polarization maintaining optical fibre two (9) of Polarization Controller three (8); The input end of the output termination general single mode fiber one (10) of polarization maintaining optical fibre two (9); The port a of the output termination coupling mechanism one (11) of general single mode fiber one (10); The port b of coupling mechanism one (11) meets the port b of wavelength division multiplexer (2); The port c of coupling mechanism one (11) meets the port a of coupling mechanism two (14); The port c of coupling mechanism two (14) connects the input end of Polarization Controller four (12); The input end of the output termination polarization maintaining optical fibre three (13) of Polarization Controller four (12); The port d of the output termination coupling mechanism two (14) of polarization maintaining optical fibre three (13); The port b of coupling mechanism two (14) meets the port a of phase-modulator (15); The port c of phase-modulator (15) connects the input end of general single mode fiber two (17); The input end of the output termination photodetector (16) of general single mode fiber two (17); The port b of phase-modulator (15) is the rf inputs mouth; The output terminal of photodetector (16) is an output port.
2. according to the tunable microwave photon bandpass filter described in claims 1 based on multi-wavelength optical fiber laser, it is characterized in that: described general single mode fiber one (10) is as the nonlinear polarization rotating media, and its length is between 3 km to 8 kms.
3. according to the tunable microwave photon bandpass filter described in claims 1 based on multi-wavelength optical fiber laser, it is characterized in that: by regulating effective birefringence intensity that Polarization Controller three (8) is regulated polarization maintaining optical fibre one (7) and polarization maintaining optical fibre two (9), thus the wavelength interval of adjusting multi-wavelength optical fiber laser.
4. according to the tunable microwave photon bandpass filter described in claims 1 based on multi-wavelength optical fiber laser, it is characterized in that: the length of described polarization maintaining optical fibre three (13) is between 5 meters to 10 meters, control the transmission spectrum of birefringence fiber ring mirror by regulating Polarization Controller four (12), make its move left and right.
5. according to the tunable microwave photon bandpass filter based on multi-wavelength optical fiber laser described in claims 1, it is characterized in that: described Polarization Controller four (12), polarization maintaining optical fibre three (13) and coupling mechanism two (14) are formed birefringence fiber ring mirror.
6. according to the tunable microwave photon bandpass filter based on multi-wavelength optical fiber laser described in claims 1, it is characterized in that: described coupling mechanism one (11) is the 10dB coupling mechanism, and coupling mechanism two (14) is a three-dB coupler.
7. according to the tunable microwave photon bandpass filter based on multi-wavelength optical fiber laser described in claims 1, it is characterized in that: described pumping source (1) is the pumping source of 980nm or 1480nm.
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| CN102931567A (en) * | 2012-11-01 | 2013-02-13 | 贵州大学 | All-optical microwave signal oscillator |
| CN103257407A (en) * | 2012-02-20 | 2013-08-21 | 泰科电子(上海)有限公司 | Connector and connector assembly |
| CN103457674A (en) * | 2013-08-22 | 2013-12-18 | 暨南大学 | Infinite impulse response microwave photon filter and filtering method |
| CN103454783A (en) * | 2013-09-13 | 2013-12-18 | 天津理工大学 | Microwave photon band-pass filter based on cascaded chromatic dispersion devices |
| CN103701012A (en) * | 2013-12-27 | 2014-04-02 | 贵州大学 | All-optical microwave signal generator |
| CN106154685A (en) * | 2016-08-01 | 2016-11-23 | 天津理工大学 | Continuously adjustable band based on four-wave mixing leads to microwave photon filter |
| CN106154590A (en) * | 2016-08-01 | 2016-11-23 | 天津理工大学 | Continuously adjustable trap microwave photon filter based on four-wave mixing |
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| CN106200014A (en) * | 2016-08-01 | 2016-12-07 | 天津理工大学 | Super wideband and tunable microwave photon filter based on high double-refraction photon crystal fiber Yu fiber optic loop |
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| CN112688149A (en) * | 2020-12-28 | 2021-04-20 | 河北大学 | Adjustable ultra-narrow band optical fiber filter |
| CN114039266A (en) * | 2021-11-05 | 2022-02-11 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
| CN114039266B (en) * | 2021-11-05 | 2024-03-22 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
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