CN113328331B - A Ultrashort Pulse Laser Generator Based on High Saturable Absorption Sagnac Ring - Google Patents
A Ultrashort Pulse Laser Generator Based on High Saturable Absorption Sagnac Ring Download PDFInfo
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- CN113328331B CN113328331B CN202110527315.1A CN202110527315A CN113328331B CN 113328331 B CN113328331 B CN 113328331B CN 202110527315 A CN202110527315 A CN 202110527315A CN 113328331 B CN113328331 B CN 113328331B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 54
- 239000006185 dispersion Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 15
- 230000009022 nonlinear effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000010363 phase shift Effects 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 description 13
- 239000006096 absorbing agent Substances 0.000 description 9
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
- H01S3/1003—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors tunable optical elements, e.g. acousto-optic filters, tunable gratings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0064—Anti-reflection devices, e.g. optical isolaters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2375—Hybrid lasers
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Abstract
本发明基于高饱和吸收Sagnac环超短脉冲激光发生器，脉冲激光器通过第一隔离器链接2×2光纤耦合器第一端口，耦合器第二端口与第一波分复用器第一端口链接；连续波泵浦激光器通过第二隔离器链接第一波分复用器第二端口，第一波分复用器第三端口依次通过掺饵光纤放大器、多模光纤、检偏器与第二波分复用器第一端口链接，第二波分复用器第三端口将剩余的泵浦信号分离出去，第二波分复用器第二端口与耦合器第三端口链接，耦合器第四端口通过滤波器与色散补偿光纤第一端口链接，色散补偿光纤第二端口引出信号。本发明采用具有饱和吸收效应和非线性的多模光纤、EDFA、检偏器、Sagnac环，能够较好地对脉冲激光进行压缩和整形，产生超短和高功率脉冲。
The invention is based on a high saturable absorption Sagnac ring ultra-short pulse laser generator. The pulse laser is connected to the first port of a 2×2 fiber coupler through a first isolator, and the second port of the coupler is connected to the first port of the first wavelength division multiplexer. The continuous wave pump laser is connected to the second port of the first wavelength division multiplexer through the second isolator, and the third port of the first wavelength division multiplexer is connected to the second The first port of the wavelength division multiplexer is linked, the third port of the second wavelength division multiplexer separates the remaining pump signal, the second port of the second wavelength division multiplexer is linked to the third port of the coupler, and the third port of the coupler is connected. The four ports are connected to the first port of the dispersion compensation fiber through a filter, and the second port of the dispersion compensation fiber leads out signals. The invention adopts multi-mode fiber, EDFA, analyzer and Sagnac ring with saturable absorption effect and nonlinearity, which can better compress and shape pulse laser, and generate ultra-short and high-power pulse.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a high saturation absorption Sagnac loop-based ultra-short pulse laser generator.
Background
High power ultrashort pulse lasers have wide application and important role in military and civil communication technologies. In terms of communication, the generation of ultrashort pulses is beneficial to generating pulses with high repetition rate, and the capacity of communication can be further improved. In military terms, the narrower the temporal width of the laser, although the average power is low, the peak power of the pulse can be further increased. The laser communication device has more and more important functions as a weapon or laser communication. Although Sagnac loops are also used as pulse shaping devices, the aggregate erbium-doped fiber amplifier and the saturable absorber are not seen.
Based on the current situation, the invention provides a Sagnac loop-based ultra-short pulse laser generator based on high saturation absorption.
Disclosure of Invention
Aiming at the current situation and the wide and important application of the ultrashort pulse laser in communication, medicine and other aspects, the invention provides a high saturation absorption Sagnac loop-based ultrashort pulse laser generator.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a Sagnac loop ultra-short pulse laser generator based on high saturation absorption comprises a pulse laser of a gain switch, a continuous wave pump laser, a first isolator, a second isolator, a2 x 2 optical fiber coupler, a first wavelength division multiplexer, a second wavelength division multiplexer, an erbium-doped optical fiber amplifier, a multimode optical fiber with saturation absorption effect and nonlinear effect, an analyzer, a filter and a dispersion compensation optical fiber, wherein the pulse laser is connected with a first port of the 2 x 2 optical fiber coupler through the first isolator, and a second port of the 2 x 2 optical fiber coupler is connected with a first port of the first wavelength division multiplexer; the continuous wave pump laser is connected with a second port of the first wavelength division multiplexer through a second isolator, a third port of the first wavelength division multiplexer is connected with a first port of the second wavelength division multiplexer through the erbium-doped fiber amplifier, the multimode fiber and the analyzer in sequence, a third port of the second wavelength division multiplexer separates out the residual pump signals, a second port of the second wavelength division multiplexer is connected with a third port of the 2 x 2 fiber coupler, a fourth port of the 2 x 2 fiber coupler is connected with a first port of the dispersion compensation fiber through a filter, and signals are led out from a second port of the dispersion compensation fiber.
The invention is different from the existing ultra-short pulse laser generator and shaper system in that a pulse laser of a gain switch generates a pulse light source with wider width, the pulse light source passes through an isolator which has the function of preventing reflected light from entering the laser to generate light chaos, and the reflected light passes through a2 x 2 optical coupler after passing through the isolator, is divided into two paths at two emergent ports of the optical coupler and enters a Sagnac ring along the clockwise direction and the anticlockwise direction. After continuous waves generated by the pump laser pass through the isolator, clockwise signals and the continuous waves in the Sagnac ring are multiplexed into the same optical fiber channel by the optical wavelength division multiplexer and then transmitted to the EDFA, so that the clockwise signals and the anticlockwise signals are amplified by the pump waves through the EDFA. The clockwise signal is amplified and enters a multimode optical fiber with saturation absorption effect and nonlinear effect, the clockwise signal passes through an analyzer, the remaining pumping signal is separated out through a wavelength division multiplexer, and the remaining clockwise signal is transmitted to a coupler. The anticlockwise signals respectively pass through a wavelength division multiplexer, an analyzer, a multimode optical fiber with saturated absorption and nonlinear effects, an EDFA and the wavelength division multiplexer and then are transmitted to the other port of the coupler. The counterclockwise signal is low in power after reaching the saturable absorber, the clockwise signal is not high in power after being amplified, the counterclockwise signal is absorbed by the saturable absorber, is absorbed to a certain degree, is saturated, has light output, and is finally transmitted to two ends of the coupler.
Preferably, the pulsed laser generates a Clock (CLK) with a repetition rate of 100MHz and a signal width of 20 ns. The core wavelength was 1550nm and the power 2. mu.W.
Preferably, the pump laser generates a continuous wave power of 20mW with a center wavelength of 980 nm.
Preferably, the splitting ratio of the coupler is 45: 55.
Preferably, the absorption coefficient is 0 at the time of saturated absorption.
Preferably, the gain of the EDFA is 20 dB.
Preferably, the dispersion compensating fiber has a length of 10 m and a group velocity dispersion coefficient of-80 ps2/km。
The invention relates to a high saturation absorption Sagnac ring ultra-short pulse laser generator which is characterized in that a pulse laser of a gain switch generates a pulse light source with wider width, the pulse light source passes through an isolator, reflected light prevented by the isolator enters the laser, passes through a2 x 2 optical coupler after passing through the isolator, is divided into two paths at two emergent ports of the optical coupler, and enters a Sagnac ring along the clockwise direction and the anticlockwise direction. After continuous waves generated by the pump laser pass through the isolator, clockwise signals and the continuous waves in the Sagnac ring are multiplexed into the same optical fiber channel by the optical wavelength division multiplexer and then transmitted to the EDFA, so that the clockwise signals and the anticlockwise signals are amplified by the pump waves through the EDFA. The clockwise signal is amplified and enters a multimode optical fiber with saturation absorption effect and nonlinear effect, the clockwise signal passes through an analyzer, the remaining pumping signal is separated out through a wavelength division multiplexer, and the remaining clockwise signal is transmitted to a coupler. The anticlockwise signals respectively pass through a wavelength division multiplexer, an analyzer, a multimode optical fiber with saturated absorption and nonlinear effects, an EDFA and the wavelength division multiplexer and then are transmitted to the other port of the coupler.
The counterclockwise signal is low in power after reaching the saturable absorber, the power is not high after the clockwise signal is amplified, the counterclockwise signal is absorbed by the saturable absorber at the beginning for a period of time, the counterclockwise signal is absorbed to a certain degree and is saturated, light output can be realized, and the clockwise signal and the counterclockwise signal are subjected to different phase shifts due to self-phase modulation and cross-phase modulation effects, the phase shift controls the switch of the transmission end of the 2X 2 optical coupler, and the transmittance is low at low power and high at high power, and the pulse compression and shaping can be realized by combining with the multimode fiber saturation absorption effect.
The invention adopts the multimode fiber with saturation absorption effect and nonlinearity, the EDFA, the analyzer and the Sagnac ring, and can better compress and shape the pulse laser to generate ultrashort and high-power pulses.
Drawings
Fig. 1 is a schematic structural diagram of a Sagnac loop-based ultra-short pulse laser generator according to a preferred embodiment of the present invention.
Fig. 2 is a diagram of an initial optical pulse signal.
Fig. 3 is a diagram of a transmission end optical pulse signal.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the Sagnac loop-based ultra-short pulse laser generator according to the present embodiment includes a pulse laser 1-1 with a gain switch, a continuous wave pump laser 1-2, a first isolator 2-1, a second isolator 2-2, a2 × 2 fiber coupler 3, a first wavelength division multiplexer 4-1, a second wavelength division multiplexer 4-2, an erbium-doped fiber amplifier (EDFA)5, a multimode fiber 6 with a saturation absorption effect and a nonlinear effect, a polarization analyzer 7, a filter 8, and a dispersion compensation fiber 9. The port a1 of the pulse laser 1-1 is linked with the first port b1 of the first isolator 2-1, the second port b2 of the first isolator 2-1 is linked with the first port c1 of the 2 × 2 fiber coupler 3, the second port c2 of the 2 × 2 fiber coupler 3 is linked with the first port d1 of the first wavelength division multiplexer 4-1, the port a2 of the pump source 1-2 is linked with the first port b3 of the second isolator 2-2, the second port b4 of the second isolator 2-2 is linked with the second port d2 of the first wavelength division multiplexer 4-1, the third port d3 of the first wavelength division multiplexer 4-1 is linked with the first port e1 of the EDFA5, the second port e2 of the multimode fiber 5 is linked with the first port f1 of the multimode fiber 6, the second port f 636 of the multimode fiber 6 is linked with the first port g 357 of the first wavelength division multiplexer, the second port b2 of the multimode fiber 3 g 367-7, the third port h3 of the second wavelength division multiplexer 4-2 splits out the remaining pump signal, the second port h2 of the second wavelength division multiplexer 4-2 is linked with the third port c3 of the 2 × 2 fiber coupler 3, the fourth port c4 of the 2 × 2 fiber coupler 3 is linked with the first port i1 of the filter 8, thus forming a Sagnac loop, and the second port i2 of the filter 8 is linked with the first port l1 of the dispersion compensating fiber 9, and the signal is led out from the second port l2 of the dispersion compensating fiber 9.
In this embodiment, the pulsed laser generates a Clock (CLK) with a repetition rate of 100MHz and a signal width of 20 ns. The core wavelength was 1550nm and the power 2. mu.W. The pump laser generates a continuous wave with a power of 20mW and a center wavelength of 980 nm. The splitting ratio of the coupler is 45: 55. When saturated absorption is performed, the absorption coefficient is 0. The length of the dispersion compensation fiber is 10 m, and the group velocity dispersion coefficient is-80 ps2/km。
In this embodiment, the counterclockwise signal has low power after reaching the saturable absorber, and the clockwise optical signal is amplified and has low power, and is absorbed by the saturable absorber for a certain period of time, and is absorbed to a certain degree to reach saturation, and then is output, and finally is transmitted to two ends of the coupler.
The invention is based on a high saturated absorption Sagnac ring ultra-short pulse laser generator:
1. the pulse laser generates a pulse with a wider time width, is coupled into the Sagnac ring by the coupler, is divided into two paths, and propagates along the clockwise direction and the anticlockwise direction.
2. The counterclockwise signal reaches the saturable absorber with low power and is absorbed in the initial stage.
3. After the clockwise optical signal is amplified, the power is not high, and the clockwise optical signal is absorbed by the saturable absorber for a period of time. To a certain extent, saturation was reached.
4. The output light is transmitted to both ends of the coupler, and the clockwise and counterclockwise signals get different phase shifts due to self-phase modulation and cross-phase modulation effects.
5. The phase shift controls the switch of the transmission end of the 2 x 2 optical coupler, and the transmission rate is low at low power and high at high power, and the pulse compression and shaping can be realized by combining with the saturation absorption effect of the multimode optical fiber.
The invention can obtain narrow pulse signal output.
The invention utilizes the Saganac ring with high saturation absorption multimode fiber and erbium-doped fiber amplifier (EDFA) to construct the ultra-short pulse laser generator and shaper, which has the characteristics of narrow pulse time width and high power.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.
Claims (6)
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| CN102176105A (en) * | 2011-03-10 | 2011-09-07 | 上海交通大学 | Direct-phase-modulation-based femtosecond wideband pulse generation optical ring |
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| JP3961153B2 (en) * | 1999-05-14 | 2007-08-22 | 富士通株式会社 | Method, apparatus and system for regenerating and applying an optical clock |
| JP4689008B2 (en) * | 2000-07-04 | 2011-05-25 | 富士通株式会社 | Method and apparatus for waveform shaping of signal light |
| CN1273847C (en) * | 2003-12-17 | 2006-09-06 | 中国科学院上海光学精密机械研究所 | Multipurpose full gloss optical shaper based on sagnac ring |
| CN101771235B (en) * | 2010-02-10 | 2011-11-30 | 南通墨禾量子科技发展有限公司 | Method for generating phase noise-controlled low repetition frequency femtosecond laser pulse |
| CN109217085B (en) * | 2018-09-06 | 2020-09-01 | 上海理工大学 | Passive all-optical synchronous full-polarization-preserving ultrafast optical fiber laser system |
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| CN102176105A (en) * | 2011-03-10 | 2011-09-07 | 上海交通大学 | Direct-phase-modulation-based femtosecond wideband pulse generation optical ring |
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