CN205622038U - Tunable single -frequency optic fibre laser lamp -house of width that coherent light orthogonal frequency division multiplexing system used - Google Patents
Tunable single -frequency optic fibre laser lamp -house of width that coherent light orthogonal frequency division multiplexing system used Download PDFInfo
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- CN205622038U CN205622038U CN201521057304.8U CN201521057304U CN205622038U CN 205622038 U CN205622038 U CN 205622038U CN 201521057304 U CN201521057304 U CN 201521057304U CN 205622038 U CN205622038 U CN 205622038U
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Abstract
The utility model discloses a tunable single -frequency optic fibre laser lamp -house of width that coherent light orthogonal frequency division multiplexing system used, including the high reflectivity fiber grating that warbles, high -gain optic fibre, the antiradar reflectivity fiber grating that warbles, single mode diode pumped laser, optical wavelength division multiplexer, optical coupler, optical circulator, tunable optical filter subassembly. The antiradar reflectivity is warbled fiber grating and high reflectivity and is warbled fiber grating and realize the laser oscillation as chamber mirror around the resonant cavity together, but get into tunable filter ware subassembly from the wide spectrum laser of optical wavelength division multiplexer output is partly after the optical coupler beam split through the optical circulator, do you but pick out arbitrary ITU through tunable filter ware subassembly the wavelength that T regulation nominal central frequency corresponds, its 3dB spectral width is less than 0.1nm, rethread optical circulator and optical coupler return and pour into the resonant cavity the inside into, go on from injection locking the resonant cavity, combine stub nature resonant cavity structure and filter bank realization narrow linewidth, the sharp lase of single longitudinal mode mode.
Description
Technical field
This utility model relates to coherent light communication, Fibre Optical Sensor, coherent swpectrum close the Fiber laser technology that can be used for coherent light ofdm system in the field such as bundle, and the output wavelength tunable range being specifically related to coherent light ofdm system is big, the wide tunable single frequency fiber LASER Light Source of narrow linewidth.
Background technology
Coherent light OFDM (CO-OFDM) is the one of multi-carrier modulation technology, can efficiently solve the intersymbol interference problem caused by dispersive channel, it is possible to be widely used in various broadband wireless and wire communication.This resisting chromatic dispersion ability is emphasizing that high speed, today of broadband ability are particularly important.Crucial optical device in coherent light ofdm system includes accurate adjustable narrow linewidth laser and centre wavelength and the most adjustable wavelength-selective switches of bandwidth.Single frequency optical fiber laser refers to that laser resonance intracavity, to vibrate the form output of single longitudinal mode (single-frequency), is characterized by that laser spectrum live width is the narrowest, can reach 10-8Nm, has exceeded several order of magnitude than general conventional narrow linewidth DFB semiconductor laser, can suppress phase noise well and realize in high-capacity and high-speed optical transport network the detection to signal phase.On the other hand, for having the optical network system that wavelength dynamically distributes, the fiber laser light source of Output of laser wavelength wide tunable can be used as carrier signal source.
The research work of current tunable single-frequency LASER Light Source concentrates on the gain media using the highly doped silica fibre of rare earth ion or doping solid crystals as laser, use short straight chamber, the structure such as annular chamber or Compound Cavity, bulk optics components and parts (the Polarization Controller that reliability is low is inserted in its light path, hot luminescent crystal, electro-optic crystal or F-P etalon etc.) it is used as to eliminate spatial hole burning, maintain single-frequency operation or laser frequency regulation, but all exist and break all-fiber structure, dopant ion concentration cannot improve further, resonator cavity cavity is longer, there is random mode hopping, some problems such as many longitudinal modes easily occur.Maximum difficult point be live width more difficult accomplish below 10kHz, noise compared with big, tuning range is discontinuous, long-time stability are poor.
Utility model content
The purpose of this utility model is the deficiency in overcoming prior art above-mentioned, disclose the wide tunable single frequency fiber LASER Light Source that can be used for coherent light ofdm system, combine short-term type resonator cavity by self-injection locking structure and achieve the wide tunable range single frequency fiber LASER Light Source of all optical fibre structure together with tunable optic filter group.
The purpose of this utility model is achieved through the following technical solutions.
The wide tunable single frequency fiber LASER Light Source of a kind of coherent light ofdm system, including a high reflectance chirped fiber grating, high-gain optical fiber, antiradar reflectivity chirped fiber grating, light wavelength division multiplexing, single mode semiconductor pump laser, photo-coupler, optoisolator, optical circulator, adjustable light wave-filter assembly.Structural relation between each parts is: high-gain optical fiber is as chamber mirror before and after the gain media of the laserresonator of compact conformation, antiradar reflectivity chirped fiber grating and high reflectance chirped fiber grating composition laserresonator, it is achieved laser is in the vibration of intracavity.High reflectance chirped fiber grating, high-gain optical fiber, antiradar reflectivity chirped fiber grating constitutes the resonator cavity of laser instrument, the laser of resonator cavity output enters in adjustable light wave-filter assembly through photo-coupler rear portion light by optical circulator, carry out after arbitrary ITU-T specifies that wavelength corresponding to nominal center frequency selects by the tunable optic filter assembly that very bandwidth is narrow, injecting via optical circulator and photo-coupler returns in laserresonator again, structure in conjunction with compact short-term die cavity, resonator cavity lasing after injecting locking goes out ITU-T and specifies the single frequency fiber laser of nominal center frequency corresponding wavelength.Different ITU-T can be selected to specify the optical maser wavelength that nominal center frequency is corresponding by regulation tunable optic filter assembly, thus realize the single-frequency laser output of wide tunable range.Single-frequency laser signal enters photo-coupler via the signal end of light wavelength division multiplexing, then exports from the outfan of optoisolator.
Optimize further, described adjustable light wave-filter assembly is a kind of device being gone by certain Free Spectral Range and bandwidth and realizing selecting by or stop specifically wavelength in light path system, structurally include but not limited to the combination etc. of one or several adjustable light wave-filters, implementation method includes but not limited to acousto-optic tunable filter, electro-optical tunable filters, mechanical type optic tunable filter, Thermo-optic tunability wave filter etc..
Optimizing further, the Free Spectral Range of described adjustable light wave-filter assembly is 0.5～500nm, and three dB bandwidth is less than 0.1nm.
Optimizing further, described optical fiber laser is compact short straight cavity configuration, and its front cavity mirror is antiradar reflectivity chirped fiber grating, and Effect of Back-Cavity Mirror uses high reflectance chirped fiber grating；Described reflectance chirped fiber grating is low instead to excitation optical signal, and reflectance is 10%～90%, its 3dB reflectance spectrum a width of 1～40nm.Described high reflectance chirped fiber grating is high thoroughly to pump light, and absorbance is more than 90%, and high anti-to excitation optical signal, and reflectance is more than 95%, its 3dB reflectance spectrum a width of 1～40nm.
Optimizing further, the unit length gain of described high-gain optical fiber is more than 0.2dB/cm, and fiber lengths is 0.5～100cm.
nullCompared with prior art，Of the present utility model having the technical effect that can be using the high-gain optical fiber of centimetres as the gain media of laser，Chamber mirror before and after cavity resonator structure is formed by antiradar reflectivity chirped fiber grating and high reflectance chirped fiber grating，Under the continuous pump of single mode semiconductor laser pumping source，High-gain particle in fibre core inverts，Produce the laser signal of stimulated emission，The broad band laser signal of resonator cavity output enters adjustable light wave-filter assembly through photo-coupler rear portion light by optical circulator，The single longitudinal mode laser signal of ITU-T regulation nominal center frequency corresponding wavelength is obtained after the longitudinal mode of tunable optic filter assembly selects，Inject back in resonator cavity via optical circulator and photo-coupler again，Short-term die cavity after self-injection locking just can go out the single-frequency laser of the wavelength that ITU-T specifies that nominal center frequency is corresponding with lasing.The longitudinal mode pattern of wavelength that different ITU-T specifies that nominal center frequency is corresponding can be selected by regulation tunable optic filter assembly, finally realize tunable wave length, meet ITU-T and specify the single-frequency laser output of nominal center frequency.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the wide tunable single frequency fiber LASER Light Source of this utility model a kind of coherent light ofdm system.
Detailed description of the invention
With object lesson, detailed description of the invention of the present utility model is further described below in conjunction with the accompanying drawings; it should be noted that the scope that this utility model claims is not limited to the scope of embodiment statement; if there being the process of not detailed description especially below, it is all that those skilled in the art can refer to prior art realization.
Such as Fig. 1, the wide tunable single frequency fiber LASER Light Source of a kind of coherent light ofdm system, including a high reflectance chirped fiber grating 1, high-gain optical fiber 2, antiradar reflectivity chirped fiber grating 3, light wavelength division multiplexing 4, single mode semiconductor pump laser 5, photo-coupler 6, optoisolator 7, optical circulator 8, adjustable light wave-filter assembly 9.Structural relation between each parts is: high-gain optical fiber 2 forms chamber mirror before and after laserresonator as the gain media of the laserresonator of compact conformation, antiradar reflectivity chirped fiber grating 3 and high reflectance chirped fiber grating 1, it is achieved laser is in the vibration of intracavity.High reflectance chirped fiber grating 1, high-gain optical fiber 2, antiradar reflectivity chirped fiber grating 3 constitutes the resonator cavity of laser instrument, the laser of resonator cavity output enters in adjustable light wave-filter assembly 9 through photo-coupler 6 rear portion light by optical circulator 8, carry out after the narrow ITU-T of very bandwidth specifies that the wavelength that nominal center frequency is corresponding selects by the tunable optic filter assembly 9 that very bandwidth is narrow, injecting via optical circulator 8 and photo-coupler 6 returns in laserresonator again, structure in conjunction with compact short-term die cavity, resonator cavity lasing after self-injection locking goes out the single frequency fiber laser of the wavelength that ITU-T specifies that nominal center frequency is corresponding.Different ITU-T can be selected to specify the wavelength that nominal center frequency is corresponding by regulation tunable optic filter assembly, thus realize the single-frequency laser output of wide tunable range.Single-frequency laser signal enters photo-coupler 6 via the signal end of light wavelength division multiplexing 4, then exports from the outfan of optoisolator 7.Selecting, by tunable optic filter assembly, the wavelength that arbitrary ITU-T specifies that nominal center frequency is corresponding, its 3dB spectrum width is less than 0.1nm.
Embodiment 1
Band optical fiber grating 1 center reflection wavelength of this example is laser output wavelength 1552.52nm, a width of 40nm of 3dB reflectance spectrum, and this example centre wavelength reflectance is more than 99.95%.The center reflection wavelength of antiradar reflectivity chirped fiber grating 3 coupling output grating is laser output wavelength 1552.52nm, and its three dB bandwidth is 40nm, and centre wavelength reflectance is 10～95%, and this example centre wavelength rate of penetrating is 60%.High reflectance chirped fiber grating 1 becomes one to have wider spectral region selection and the functional module of filter action with antiradar reflectivity chirped fiber grating 3.Wherein, high reflectance chirped fiber grating 1 and high-gain optical fiber 2 welding or end face docking mode connect；Fiber end face grinding and polishing is used to be connected with chamber mirror closed butt joint mode between high-gain optical fiber 2 and antiradar reflectivity chirped fiber grating 3.The light splitting ratio of photo-coupler is from 1:99 to 50:50, and this example uses the photo-coupler 6 of 10:90 light splitting ratio.The adjustable light wave-filter assembly 9 that this example uses is F-P cavity tunable optic filter, and its Free Spectral Range reaches 70nm, and three dB bandwidth is 0.02nm, and operating wavelength range is from 1520-1570nm.
Pump mode uses backward pump, single mode semiconductor pump laser 5 produce pump light and input via the pumping end of light wavelength division multiplexing 3, via in antiradar reflectivity chirped fiber grating 3 to the fibre core of high-gain optical fiber 2, carry out fibre core pumping.Gain particle in pump light continuous pumping fibre core so that it is reach population inversion, stimulated emission produces laser signal.The continuous light signal of resonator cavity output is after the photo-coupler 6 of 10:90, the flashlight of 90% enters in F-P cavity tunable optic filter 9 by optical circulator 8, be then passed through regulate tunable optic filter select meet ITU-T standard regulation, wavelength be 1552.52nm (nominal center frequency 193.10THz) single longitudinal mode after obtain single-frequency laser signal, injecting back in resonator cavity via optical circulator 8 and photo-coupler 6 again, the resonator cavity after self-injection locking produces the single-frequency laser signal that wavelength is 1552.52nm.Laser signal enters photo-coupler 6 via the signal end of light wavelength division multiplexing 4, the single-frequency laser signal of 10% exports from the outfan of optoisolator 7, tunable wavelength scope can be obtained by regulation F-P cavity tunable optic filter and reach 40nm, live width < the single-frequency laser output meeting ITU-T nominal center frequency corresponding wavelength of 10kHz.
Claims (6)
1. the wide tunable single frequency fiber LASER Light Source of coherent light ofdm system, it is characterised in that include a high reflectance chirped fiber grating (1), high-gain optical fiber (2), antiradar reflectivity chirped fiber grating (3), light wavelength division multiplexing (4), single mode semiconductor pump laser (5), photo-coupler (6), optoisolator (7), optical circulator (8), adjustable light wave-filter assembly (9)；Structural relation between each parts is: high-gain optical fiber (2) is as the gain media of the laserresonator of compact conformation, chamber mirror before and after antiradar reflectivity chirped fiber grating (3) and high reflectance chirped fiber grating (1) composition laserresonator, it is achieved laser is in the vibration of intracavity；High reflectance chirped fiber grating (1), high-gain optical fiber (2), antiradar reflectivity chirped fiber grating (3) constitutes the line style resonator cavity of laser instrument, the laser of resonator cavity output enters in adjustable light wave-filter assembly (9) through photo-coupler (6) rear portion light by optical circulator (8), arbitrary ITU-T is selected to specify the wavelength that nominal center frequency is corresponding by tunable optic filter assembly (9), injecting via optical circulator (8) and photo-coupler (6) returns in laserresonator again, resonator cavity lasing after self-injection locking goes out the single frequency fiber laser of the wavelength that ITU-T specifies that nominal center frequency is corresponding；Different ITU-T can be selected to specify the wavelength that nominal center frequency is corresponding by regulation tunable optic filter assembly, thus realize the single-frequency laser output of wide tunable range；Single-frequency laser signal enters photo-coupler (6) via the signal end of light wavelength division multiplexing (4), then exports from the outfan of optoisolator (7).
The wide tunable single frequency fiber LASER Light Source of coherent light ofdm system the most according to claim 1, it is characterized in that: described adjustable light wave-filter assembly (9) is to go to realize selecting by or stop the device of corresponding wavelength in light path system by setting Free Spectral Range and bandwidth, structurally includes an adjustable light wave-filter or the combination of multiple adjustable light wave-filter.
The wide tunable single frequency fiber LASER Light Source of coherent light ofdm system the most according to claim 2, it is characterised in that: described adjustable light wave-filter includes acousto-optic tunable filter, electro-optical tunable filters, mechanical type optic tunable filter or Thermo-optic tunability wave filter.
The wide tunable single frequency fiber LASER Light Source of coherent light ofdm system the most according to claim 1, it is characterised in that: the Free Spectral Range of described adjustable light wave-filter assembly (9) is 0.5 ~ 500 nm, and 3 dB bandwidth are less than 0.1 nm.
The wide tunable single frequency fiber LASER Light Source of coherent light ofdm system the most according to claim 1, it is characterized in that: described fiber laser light source is straight cavity configuration, its front cavity mirror is antiradar reflectivity chirped fiber grating (3), and Effect of Back-Cavity Mirror uses high reflectance chirped fiber grating (1)；Described reflectance chirped fiber grating (3) is low instead to excitation optical signal, and reflectance is 10% ~ 90%, a width of 1 ~ 40 nm of its 3dB reflectance spectrum；Described high reflectance chirped fiber grating (1) is high thoroughly to pump light, and absorbance is more than 90%, and high anti-to excitation optical signal, and reflectance is more than 95%, a width of 1 ~ 40 nm of its 3dB reflectance spectrum.
The width adjustable single frequency fiber LASER Light Source of coherent light ofdm system the most according to claim 1, it is characterised in that: the unit length gain of described high-gain optical fiber (6) is more than 0.2 dB/cm, and fiber lengths is 0.5～100
cm。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428973A (en) * | 2015-12-18 | 2016-03-23 | 华南理工大学 | Wide tunable single-frequency fiber laser light source for coherent optical orthogonal frequency division multiplexing system |
| CN106505403A (en) * | 2016-12-05 | 2017-03-15 | 华南理工大学 | A kind of adjustable frequency comb of repetition rate produced based on bulk of optical feedback |
| CN110212398A (en) * | 2019-06-05 | 2019-09-06 | 华南理工大学 | A kind of single frequency optical fiber laser of the wide tunable based on multimode interference effect |
-
2015
- 2015-12-18 CN CN201521057304.8U patent/CN205622038U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428973A (en) * | 2015-12-18 | 2016-03-23 | 华南理工大学 | Wide tunable single-frequency fiber laser light source for coherent optical orthogonal frequency division multiplexing system |
| CN105428973B (en) * | 2015-12-18 | 2020-11-24 | 华南理工大学 | Wide tunable single-frequency optical fiber laser light source for coherent light orthogonal frequency division multiplexing system |
| CN106505403A (en) * | 2016-12-05 | 2017-03-15 | 华南理工大学 | A kind of adjustable frequency comb of repetition rate produced based on bulk of optical feedback |
| CN106505403B (en) * | 2016-12-05 | 2023-04-25 | 华南理工大学 | Optical feedback-based repetition frequency-adjustable optical frequency comb |
| CN110212398A (en) * | 2019-06-05 | 2019-09-06 | 华南理工大学 | A kind of single frequency optical fiber laser of the wide tunable based on multimode interference effect |
| WO2020244130A1 (en) * | 2019-06-05 | 2020-12-10 | 华南理工大学 | Multimode interference effect-based widely tunable single-frequency fiber laser |
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