CN205488991U - Single -frequency optical -fiber laser intensity noise suppression device of nearly xiao te noise margin of broadband - Google Patents
Single -frequency optical -fiber laser intensity noise suppression device of nearly xiao te noise margin of broadband Download PDFInfo
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- CN205488991U CN205488991U CN201620102112.2U CN201620102112U CN205488991U CN 205488991 U CN205488991 U CN 205488991U CN 201620102112 U CN201620102112 U CN 201620102112U CN 205488991 U CN205488991 U CN 205488991U
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Abstract
The utility model discloses a single -frequency optical -fiber laser intensity noise suppression device of nearly xiao te noise margin of broadband, it includes single -frequency optic fibre laser resonator, wavelength division multiplexer, single mode diode pumped light source, optical isolator, polarization controller, laser saturation amplification device, optic fibre filter module, fiber coupler, photoelectric detector and feedback control system. The utility model discloses a laser saturation amplification device can reduce the intensity noise of output laser broad frequency band to amplification device carries out feedback control again to the laser saturation, thereby can further reduce output laser intensity noise and widen the frequency range that the intensity noise suppresses, realizes finally that single frequency laser's intensity noise reduces in the broadband to near the effect the xiao te noise margin simultaneously. The utility model discloses there are wide application prospect and huge using value at ultrahigh precision with super remote laser rangefinder, optical fiber sensing and fields such as atom and molecular spectroscopy.
Description
Technical field
This utility model relates to the intensity noise suppression technology field of laser instrument, is specifically related to the single frequency fiber laser intensity noise restraining device of a kind of broadband nearly Xiao Te noise margin.
Background technology
Optical fiber laser refers to the laser instrument using doped rare earth element glass optical fiber as gain media.Under the effect of pump light, in optical fiber, easily form high power density, cause the laser levels population inversion of working-laser material, take brief measure just to may make up resonator cavity, form laser output.Optical fiber laser because its threshold pump power is low, conversion efficiency is high, Output of laser wavelength is many, tunable range width, coupling efficiency high (completely compatible with existing fiber communication system and optical fiber sensing system), compact conformation, the advantage such as with low cost have broad application prospects and huge using value in two-forty and dense wave division multipurpose laser fiber communication, high-precision optical fiber sensing technology, high power laser processing and other fields.But intensity noise is as an important indicator of optical fiber laser, it it is its key factor applied further of restriction.In sensing at fibre optic hydrophone, the low frequency intensity noise (usual frequency range is 0-20 kHz) of optical-fiber laser can increase the noise floor of system, thus affects detection accuracy and sensitivity；In Doppler anemometry radar, it is in obvious laser intensity noise (usual frequency range is hundreds of kHz to several MHz) the meeting disturbed test signal that the relaxation oscillation of Mid Frequency is brought, greatly have impact on test result.Additionally, in some advanced application scenarios such as the generation of such as squeezed light, quantum communications, gravitational wave detection, intensity noise is an important ingredient close to the LASER Light Source of Xiao Te noise margin.Therefore, being analyzed the intensity noise performance of optical fiber laser research and explore its suppressing method, the single frequency optical fiber laser how obtaining a broadband nearly Xiao Te noise margin becomes recent study focus.
The intensity noise of laser instrument refers to the output-power fluctuation situation of laser instrument, with relative intensity noise RIN(Relative Intensity Noise) describe, the laser intensity change that it is defined as in per unit band in unit power.The intensity noise of optical fiber laser mainly includes two parts: the technology noise of low frequency, the relaxation oscillation of intermediate frequency, the quantum noise of high frequency.The technology noise of low frequency is to be caused by external environment condition interference, the power fluctuation etc. of pumping source.In continuous pumping laser instrument, relaxation oscillation shows as the time dependent damped oscillation of light intensity in some frequency range, is the main reason causing laser output power to rise and fall.Its generation mechanism is that reversion particle interacts with photon in laser cavity and the laser generation that causes in gain media.The quantum noise of high frequency derives from the light quantum fluctuation in laser energy quantization process, already close to Xiao Te noise margin.Therefore, the intensity noise to optical fiber laser suppresses to be primarily directed to low-frequency technology noise and intermediate frequency relaxation oscillation the two part.
At present, laser intensity noise Restrain measurement has had a variety of.Wherein to inject locking, mode cleaner, electro-optical feedback and laser is saturated is enlarged into master.Inject locking to refer to the output injection to of a main laser (Master Laser) from laser instrument (Slave Laser), when the output light frequency of main laser is just from the resonant frequency of laser instrument, this laser signal will be exaggerated from laser instrument, and the laser intensity noise of final output can be improved accordingly.But this scheme needs two laser instrument to work, and also requires that main laser has preferable noiseproof feature simultaneously, in terms of practicality, there is bigger defect.Mode cleaner refers to the optical module with filtering characteristic, laser beam is coupled out a part of light after passing through, then detected and feed back to constitute on amplitude modulaor (AOM, EOM) after power amplifier amplifies feedback control loop by photodetector, thus reach to suppress the purpose of noise.But, the program makes whole laser structure become the most complicated, and the requirement of environment is the highest the most to external world, and the advantage of optical fiber laser all optical fibre structure has not been existed.Electro-optical feedback then refers to utilize light-dividing device extraction unit light splitting, utilize noise signal therein to control Pump Drive current, and then affect interacvity gain with reach suppress noise purpose.But there is self limitation in the suppressing bandwidth of electro-optical feedback, it is difficult to obtain the intensity noise suppression of Whole frequency band, simultaneously when constantly regulation laser pump power, easily affect stability and the laser linewidth of the output frequency of laser.The saturated amplification of laser refers to utilize the non-linear amplification of laser regulex, can be suppressed by the intensity noise of high band.But just with a laser regulex, it is difficult to the technology noise of suppression low-frequency range.
Utility model content
The purpose of this utility model is the deficiency in overcoming prior art above-mentioned, it is provided that the single frequency fiber laser intensity noise restraining device of a kind of broadband nearly Xiao Te noise margin.Combine electro-optical feedback effect by the saturated amplifying device of laser, thus the broadband intensity noise of optical fiber laser is significantly suppressed, it is thus achieved that close to the effect of Xiao Te noise margin.
The purpose of this utility model is achieved through the following technical solutions.
The single frequency fiber laser intensity noise restraining device of a kind of broadband nearly Xiao Te noise margin, it includes single-frequency optical fiber laser resonant cavity, wavelength division multiplexer, single mode semiconductor pump light source, fibre optic isolater, Polarization Controller, the saturated amplifying device of laser, optical fiber filtration module, fiber coupler, photodetector, feedback control system.The structural relation of each parts is: single-frequency optical fiber laser resonant cavity is connected with the common port of wavelength division multiplexer, the pumping end of wavelength division multiplexer is connected with single mode semiconductor pump light source, the signal end of wavelength division multiplexer is connected with the input of fibre optic isolater, the input of Polarization Controller is connected with the outfan of fibre optic isolater, the input of the saturated amplifying device of laser connects the outfan of Polarization Controller, optical fiber filtration module connects the outfan of the saturated amplifying device of laser, the input of fiber coupler connects the outfan of optical fiber filtration module, the output small end of fiber coupler connects photodetector, the outfan of photodetector is connected with feedback control system, feedback control system connects the regulation port of the saturated amplifying device of laser and constitutes feedback control loop, the output of fiber coupler is held as the laser output after noise suppressed greatly.
The most optimally, described single-frequency optical fiber laser resonant cavity is output as continuous single-frequency, the single-frequency laser of warbled any wavelength output.
The most optimally, the saturated amplifying device of described laser includes but not limited to semiconductor optical amplifier, gain fibre amplifier, nonlinear power amplifier etc..
The most optimally, described optical fiber filtration module includes but not limited to optical fiber narrow band filter, narrow bandwidth fiber grating, F-P wave filter etc..
The most optimally, the Output of laser of described single-frequency optical fiber laser resonant cavity is after the saturated amplifying device of laser, it is divided into two parts by fiber coupler, the biggest end laser is as output, small end laser is converted into the signal of telecommunication by photodetector, this signal of telecommunication carries the intensity noise information of Output of laser, after feedback control system extracts laser noise signal from the signal of telecommunication received, process through PID control, it is loaded on the regulation port of the saturated amplifying device of laser, by the way of negative feedback control, reduces wide band laser intensity noise.
Compared with prior art, the pump light having the technical effect that single mode semiconductor pump light source exports of the present utility model carries out pumping through wavelength division multiplexer to fiber resonance cavity, the laser signal exported through wavelength division multiplexer from fiber resonance cavity, after fibre optic isolater, enters the saturated amplifying device of laser and realizes the suppression of intensity noise.Laser input after suppression is divided into two parts to fiber coupler, its small portion laser is converted into the signal of telecommunication by photodetector, this signal of telecommunication carries the residual intensity noise information of Output of laser, after feedback control system extracts laser noise signal from the signal of telecommunication received, process through PID control, it is loaded on the regulation port of the saturated amplifying device of laser, by the way of negative feedback control, reduces wide band laser intensity noise further.Compared with traditional intensity noise Restrain measurement based on single operation principle, two kinds of intensity noise Restrain measurement of saturated to electro-optical feedback and laser amplification are combined by this utility model, it is provided that a kind of effective ways suppressing optical fiber laser intensity noise in the biggest bandwidth.
Accompanying drawing explanation
Fig. 1 is the structural representation of the single frequency fiber laser intensity noise restraining device of a kind of broadband of this utility model nearly Xiao Te noise margin.
In figure: 1 single-frequency optical fiber laser resonant cavity, 2 wavelength division multiplexers, 3 single mode semiconductor pump light sources, 4 fibre optic isolaters, 5 Polarization Controllers, the 6 saturated amplifying devices of laser, 7 optical fiber filtration modules, 8 fiber couplers, 9 photodetectors, 10 feedback control systems.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail explanation, but embodiment of the present utility model is not limited to this.If it is noted that the following process having not detailed description especially or parameter, being all that those skilled in the art can refer to prior art understanding or realize.
As shown in Figure 1, the single frequency fiber laser intensity noise restraining device of broadband nearly Xiao Te noise margin, including single-frequency optical fiber laser resonant cavity 1, wavelength division multiplexer 2, single mode semiconductor pump light source 3, fibre optic isolater 4, Polarization Controller 5, the saturated amplifying device of laser 6, optical fiber filtration module 7, fiber coupler 8, photodetector 9, feedback control system 10；nullSingle-frequency optical fiber laser resonant cavity 1 is connected with the common port of wavelength division multiplexer 2，The pumping end of wavelength division multiplexer 2 is connected with single mode semiconductor pump light source 3，The signal end of wavelength division multiplexer 2 is connected with the input of fibre optic isolater 4，The input of Polarization Controller 5 is connected with the outfan of fibre optic isolater 4，The input of the saturated amplifying device of laser 6 connects the outfan of Polarization Controller 5，Optical fiber filtration module 7 connects the outfan of the saturated amplifying device of laser 6，The input of fiber coupler 8 connects the outfan of optical fiber filtration module 7，The output small end of fiber coupler 8 connects photodetector 9，The outfan of photodetector 9 is connected with feedback control system 10，Feedback control system 10 connects the regulation port of the saturated amplifying device of laser 6 and constitutes feedback control loop，The output of fiber coupler 8 is held as the laser output after noise suppressed greatly；The described output of fiber coupler 8 is held greatly and is exported the specific size of small end and determined by splitting ratio.
Utilizing 980nm single mode semiconductor laser as single mode semiconductor pump light source 3 in this example, the guarantor's partial wave division multiplexer 2 through 980/1550nm realizes single-frequency optical fiber laser resonant cavity 1 is carried out backward pump.Single-frequency optical fiber laser resonant cavity 1 is single frequency fiber distributed Blatt reflective formula DBR resonator cavity that Output of laser wavelength is 1550.52nm.Output of laser, after 1550nm polarization preserving fiber isolator 4, enters Polarization Controller 5.Polarization Controller in this example is manual three ring Polarization Controllers, and the saturated amplifying device of laser 6 for inhibition strength noise is a high efficiency, the semiconductor optical amplifier of high bandwidth.The laser entering semiconductor optical amplifier is adjusted polarization state, so that it is guaranteed that the polarization state of input beam is consistent with the main shaft of semiconductor optical amplifier by manual three ring Polarization Controllers.Laser after semiconductor optical amplifier, the relaxation oscillation of Mid Frequency can be effectively suppressed, but the intensity noise of low-frequency range is because the technology noise of the pumping current disturbance of semiconductor optical amplifier and former laser is difficult to be improved.Additionally, substantial amounts of spontaneous emission noise it is introduced in the course of the work due to semiconductor optical amplifier, the signal to noise ratio of the Output of laser of serious deterioration, the spontaneous emission noise that semiconductor optical amplifier introduces is filtered by the effect of optical fiber filtration module 7 subsequently exactly, it is ensured that good OSNR.Optical fiber filtration module 7 in this example uses the narrow bandwidth of light fiber filter of a customization.Fiber coupler 8 below uses splitting ratio to be 1:99, and wherein the port of 99% exports as laser, and the port of 1% is as electro-optical feedback end, and its light beam is input to photodetector 9, the residual intensity noise signal of laser is extracted by photodetector 9.The indium gallium arsenic photodiode of the 15MHz that photodetector 9 is bandwidth in this example.The noise signal obtained can use prior art to realize through feedback control system 10(, such as PID control) calculating processes the driving electric current adjusting semiconductor optical amplifier, thus the intensity noise realizing low-frequency range suppresses.Non-linear amplification and electro-optical feedback effect eventually through semiconductor optical amplifier, it is possible to achieve the intensity noise close to quantum noise limit level of wide bandwidth (frequency range is 0.8 kHz-50 MHz) suppresses.
This utility model can reduce the intensity noise of Output of laser broad frequency band by the saturated amplifying device of laser, and amplifying device saturated to laser carries out feedback control again, such that it is able to reduce Output of laser intensity noise further and widen the frequency range of intensity noise suppression, the intensity noise finally realizing single-frequency laser is reduced to the effect near Xiao Te noise margin in broadband simultaneously.This utility model is simple and practical, the wide bandwidth intensity noise single frequency fiber lasing light emitter close to Xiao Te noise margin can be obtained, have broad application prospects and huge using value at superhigh precision and overlength distance laser ranging, Fibre Optical Sensor and the field such as atom and Molecular Spectroscopy.
Claims (5)
1. the single frequency fiber laser intensity noise restraining device of broadband nearly Xiao Te noise margin, it is characterised in that include single-frequency optical fiber laser resonant cavity (1), wavelength division multiplexer (2), single mode semiconductor pump light source (3), fibre optic isolater (4), Polarization Controller (5), the saturated amplifying device of laser (6), optical fiber filtration module (7), fiber coupler (8), photodetector (9), feedback control system (10)；nullSingle-frequency optical fiber laser resonant cavity (1) is connected with the common port of wavelength division multiplexer (2)，The pumping end of wavelength division multiplexer (2) is connected with single mode semiconductor pump light source (3)，The signal end of wavelength division multiplexer (2) is connected with the input of fibre optic isolater (4)，The input of Polarization Controller (5) is connected with the outfan of fibre optic isolater (4)，The input of the saturated amplifying device of laser (6) connects the outfan of Polarization Controller (5)，Optical fiber filtration module (7) connects the outfan of the saturated amplifying device of laser (6)，The input of fiber coupler (8) connects the outfan of optical fiber filtration module (7)，The output small end of fiber coupler (8) connects photodetector (9)，The outfan of photodetector (9) is connected with feedback control system (10)，Feedback control system (10) connects the regulation port of the saturated amplifying device of laser (6) and constitutes feedback control loop，The output of fiber coupler (8) is held as the laser output after noise suppressed greatly；The described output of fiber coupler (8) is held greatly and is exported the specific size of small end and determined by splitting ratio.
The single frequency fiber laser intensity noise restraining device of broadband the most according to claim 1 nearly Xiao Te noise margin, it is characterised in that: described single-frequency optical fiber laser resonant cavity (1) is output as continuous single-frequency, the single-frequency laser of warbled any wavelength output.
The single frequency fiber laser intensity noise restraining device of broadband the most according to claim 1 nearly Xiao Te noise margin, it is characterized in that: the saturated amplifying device of described laser (6) is semiconductor optical amplifier, gain fibre amplifier or nonlinear power amplifier.
The single frequency fiber laser intensity noise restraining device of broadband the most according to claim 1 nearly Xiao Te noise margin, it is characterised in that: described optical fiber filtration module (7) is optical fiber narrow band filter, narrow bandwidth fiber grating or F-P wave filter.
The single frequency fiber laser intensity noise restraining device of broadband the most according to claim 1 nearly Xiao Te noise margin, it is characterized in that: the Output of laser of described single-frequency optical fiber laser resonant cavity (1) is after the saturated amplifying device of laser (6), it is divided into two parts by fiber coupler (8), the biggest end laser is as output, small end laser is converted into the signal of telecommunication by photodetector (9), this signal of telecommunication carries the intensity noise information of Output of laser, after feedback control system (10) extracts laser noise signal from the signal of telecommunication received, process through PID control, it is loaded on the regulation port of the saturated amplifying device of laser (6), wide band laser intensity noise is reduced by the way of negative feedback control.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529607A (en) * | 2016-01-31 | 2016-04-27 | 华南理工大学 | Broadband single-frequency fiber laser intensity noise suppression device for achieving nearly schottky noise limit |
| CN105932530A (en) * | 2016-06-24 | 2016-09-07 | 中国科学院上海光学精密机械研究所 | Optical fiber laser intensity noise inhibition device and inhibition method |
| CN107817009A (en) * | 2017-09-30 | 2018-03-20 | 中国科学院长春光学精密机械与物理研究所 | A kind of laser detects monitoring device from mixing |
| WO2020056852A1 (en) * | 2018-09-21 | 2020-03-26 | 华南理工大学 | Tunable narrow linewidth photogenerated microwave source based on polarization control |
| CN113517627A (en) * | 2021-03-30 | 2021-10-19 | 廊坊市路环科技有限公司 | Ultra-narrow linewidth optical fiber laser capable of inhibiting relaxation oscillation |
-
2016
- 2016-01-31 CN CN201620102112.2U patent/CN205488991U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529607A (en) * | 2016-01-31 | 2016-04-27 | 华南理工大学 | Broadband single-frequency fiber laser intensity noise suppression device for achieving nearly schottky noise limit |
| CN105529607B (en) * | 2016-01-31 | 2018-11-02 | 华南理工大学 | The single frequency fiber laser intensity noise restraining device of the nearly Xiao Te noise margins of broadband |
| CN105932530A (en) * | 2016-06-24 | 2016-09-07 | 中国科学院上海光学精密机械研究所 | Optical fiber laser intensity noise inhibition device and inhibition method |
| CN107817009A (en) * | 2017-09-30 | 2018-03-20 | 中国科学院长春光学精密机械与物理研究所 | A kind of laser detects monitoring device from mixing |
| CN107817009B (en) * | 2017-09-30 | 2020-10-13 | 中国科学院长春光学精密机械与物理研究所 | Laser self-mixing detection monitoring device |
| WO2020056852A1 (en) * | 2018-09-21 | 2020-03-26 | 华南理工大学 | Tunable narrow linewidth photogenerated microwave source based on polarization control |
| US11862925B2 (en) | 2018-09-21 | 2024-01-02 | South China University Of Technology | Tunable narrow-linewidth photo-generated microwave source based on polarization control |
| CN113517627A (en) * | 2021-03-30 | 2021-10-19 | 廊坊市路环科技有限公司 | Ultra-narrow linewidth optical fiber laser capable of inhibiting relaxation oscillation |
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Granted publication date: 20160817 Effective date of abandoning: 20181102 |