CN115966991A - Pulse fiber laser of low time-frequency domain ASE noise - Google Patents
Pulse fiber laser of low time-frequency domain ASE noise Download PDFInfo
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- CN115966991A CN115966991A CN202310250310.8A CN202310250310A CN115966991A CN 115966991 A CN115966991 A CN 115966991A CN 202310250310 A CN202310250310 A CN 202310250310A CN 115966991 A CN115966991 A CN 115966991A
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- 239000000835 fiber Substances 0.000 title claims abstract description 60
- 230000003321 amplification Effects 0.000 claims abstract description 43
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 43
- 238000001914 filtration Methods 0.000 claims abstract description 32
- 239000013307 optical fiber Substances 0.000 claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 3
- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical compound [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The invention provides a pulse fiber laser with low time-frequency domain ASE noise, which comprises: the device comprises a seed source, a first pumping source, a wavelength division multiplexer, a first gain fiber and a filtering structure; the wavelength division multiplexer is used for combining and transmitting the seed light emitted by the seed source and the first pump light emitted by the pump source; the first gain optical fiber is used for pre-amplifying the gain of the beam combining light output by the wavelength division multiplexer; the filtering structure is used for filtering ASE noise in a time domain and a frequency domain in the beam combination light and outputting the processed pre-amplification level optical signal. According to the laser provided by the invention, the optical fiber Bragg grating or the band-pass filter is arranged, and the door opening time sequence signal of the acousto-optic modulator is used for filtering ASE components in a time domain and a frequency domain, so that the large-energy or high-peak-power pulse output is favorably realized in the amplification process, the signal-to-noise ratio of the laser output is improved, and the efficiency of the laser is improved.
Description
Technical Field
The invention relates to the technical field of photoelectrons, in particular to a pulse fiber laser with low time-frequency domain ASE noise.
Background
At present, the pulse fiber laser mostly adopts the technical principle of Main Oscillation Power Amplification (MOPA), and high-power output is realized by amplifying multi-stage optical fibers of seed laser with low peak power, so that the MOPA pulse fiber laser has the advantages of flexible modulation, high reliability and the like. When the seed light is weak and the gain is high, the optical fiber amplification process can generate stimulated spontaneous emission (ASE) noise. Particularly, the continuous pump light causes the existence of time-domain continuous ASE noise between two adjacent pulses, which reduces the duty ratio of pulse signals and the efficiency of the optical fiber amplification stage, and is not favorable for obtaining higher peak power and pulse stability through subsequent amplification.
Disclosure of Invention
The invention aims to solve the technical problem of stimulated spontaneous emission noise in an output time domain signal and a frequency domain signal in a pulse fiber laser of a Main Oscillation Power Amplification (MOPA) system. Specifically, the MOPA system pulse fiber laser realizes the output of larger pulse energy by taking a weak pulse laser signal as seed light and performing multi-stage amplification. During pre-amplification, continuous pump light causes continuous ASE noise between adjacent pulses. This ASE noise reduces the duty cycle of the pulse signal in the time and frequency domains of the output laser. After passing through the power amplifier stage, ASE noise is further enhanced, which results in further reduction of the signal-to-noise ratio and a reduction in the efficiency of the power amplifier. In view of the above, the present invention provides a pulsed fiber laser with low time-frequency ASE noise.
The technical scheme adopted by the invention is that the pulse fiber laser of the low time-frequency domain ASE noise comprises: the device comprises a seed source, a first pumping source, a wavelength division multiplexer, a first gain fiber and a filtering structure;
the wavelength division multiplexer is used for combining and transmitting the seed light emitted by the seed source and the first pump light emitted by the pump source;
the first gain optical fiber is used for pre-amplifying the gain of the light beam combination output by the wavelength division multiplexer;
the filtering structure is used for filtering ASE noise in a time domain and a frequency domain in the beam combination light and outputting the processed pre-amplification level optical signal.
In one embodiment, the laser further comprises an amplifier stage structure, wherein the amplifier stage structure comprises a second pump source, a fiber combiner, a second gain fiber and an isolation filter;
the optical fiber beam combiner is used for receiving the pre-amplification level optical signal, combining the pre-amplification level optical signal with the pump light emitted by the second pump source and transmitting the combined pre-amplification level optical signal and the pump light;
the second gain optical fiber is used for amplifying the gain of the beam combining light output by the optical fiber beam combiner;
the isolation filter is used for ensuring forward transmission of the current optical signal, isolating reflected light and filtering redundant pump light.
In one embodiment, the filtering structure includes: fiber bragg gratings, acousto-optic modulators;
the fiber Bragg grating is used for filtering ASE noise and redundant pump light in the beam combination optical frequency domain;
the acousto-optic modulator is used for filtering continuous ASE noise between current optical signal pulses.
In one embodiment, the laser further comprises: and the optical fiber circulator is respectively connected with the seed source, the first pumping source and the wavelength division multiplexer, is used for transmitting the seed light and the output of the pre-amplification stage, limits the current optical signal to be transmitted in a single direction, and isolates the reflected light.
In one embodiment, the filtering structure includes: band-pass filter, acousto-optic modulator;
the band-pass filter is used for filtering ASE noise and redundant pump light in the beam combination optical frequency domain;
the acousto-optic modulator is used for filtering continuous ASE noise between current optical signal pulses.
By adopting the technical scheme, the invention at least has the following advantages:
according to the pulse fiber laser with the low time-frequency domain ASE noise, the time/frequency domain ASE component is filtered by arranging the Fiber Bragg Grating (FBG) or the band-pass filter (BPF) and the door opening time sequence signal of the acousto-optic modulator, so that the pulse output with large energy or high peak power is favorably realized in the amplification process, the signal-to-noise ratio of the laser output is improved, and the efficiency of the laser is improved at the same time.
Drawings
FIG. 1 is a schematic diagram of the structural configuration of a low time-frequency domain ASE noise pulsed fiber laser according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the time-domain filtering principle of an acousto-optic modulator according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the structural configuration of a low time-frequency ASE noise pulsed fiber laser according to another embodiment of the present invention;
fig. 4 is a schematic diagram of the structural configuration of a low time-frequency domain ASE noise pulsed fiber laser according to another embodiment of the present invention.
Reference numerals
1-seed source, 2-optical fiber circulator, 3-first pump source, 4-wavelength division multiplexer, 5-first gain optical fiber, 6-optical fiber Bragg grating, 7-acousto-optic modulator, 8-second pump source, 9-optical fiber beam combiner, 10-second gain optical fiber, 11-isolation filter and 12-band-pass filter.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purposes, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.
In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
As used herein, the terms "substantially," "about," and the like are used as words of table approximation, not as words of table degree, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In a first embodiment of the present invention, a pulse fiber laser with low time-frequency domain ASE noise is shown in fig. 1, and includes: the device comprises a seed source 1, a first pumping source 3, a wavelength division multiplexer 4, a first gain fiber 5 and a filtering structure;
in this embodiment, the wavelength division multiplexer 4 is configured to combine and transmit the seed light emitted by the seed source 1 and the first pump light emitted by the pump source; the first gain optical fiber 5 is used for pre-amplifying the gain of the light beam combining stage output by the wavelength division multiplexer 4; the filtering structure is used for filtering ASE noise in a time domain and a frequency domain in the beam combination light and outputting the processed pre-amplification level optical signal.
In this embodiment, the Main Oscillation Power Amplification (MOPA) of the pulsed fiber laser may include a pre-amplification stage process and an amplification stage process, and accordingly, after the pre-amplification stage process is completed, the currently output optical signal may be further processed through the amplification stage structure.
Furthermore, the laser also comprises an amplification stage structure, wherein the amplification stage structure comprises a second pumping source 8, an optical fiber beam combiner 9, a second gain optical fiber 10 and an isolation filter 11; the optical fiber beam combiner 9 is used for receiving the pre-amplification level optical signal, and carrying out beam combination and transmission with the pump light emitted by the second pump source 8; the second gain fiber 10 is used for amplifying the gain of the beam combining light output by the fiber combiner 9; the isolation filter 11 is used to ensure forward transmission of the current optical signal, and isolate the return reflection light to filter out the excess pump light.
Optionally, the filtering structure comprises: a fiber bragg grating 6, an acousto-optic modulator 7; the fiber Bragg grating 6 is used for filtering ASE noise and redundant pump light in a beam combination optical frequency domain; the acousto-optic modulator 7 is used to filter out continuous ASE noise between the current optical signal pulses.
Preferably, the laser further comprises: and the optical fiber circulator 2 is respectively connected with the seed source 1, the first pumping source 3 and the wavelength division multiplexer 4, and is used for transmitting the seed light and pre-amplification stage output, limiting the current optical signal to be transmitted in a single direction, and isolating the reflected light.
Optionally, the filtering structure comprises: a band-pass filter 12, an acousto-optic modulator 7; the band-pass filter 12 is used for filtering ASE noise and redundant pump light in a beam combination optical frequency domain; the acousto-optic modulator 7 is used to filter out continuous ASE noise between the current optical signal pulses.
In this embodiment, the first pump source 3 may be a single-mode optical fiber semiconductor pump source, and correspondingly, the second pump source 8 may be a multi-mode optical fiber semiconductor pump source; the first gain fiber 5 may be an erbium doped gain fiber and the second gain fiber 10 may be an erbium ytterbium double clad gain fiber.
A second embodiment of the present invention, which is an application example of the present invention, is described with reference to fig. 1 and fig. 2 on the basis of the above embodiment.
Fig. 1 is a low time/frequency domain ASE noise pulsed fiber laser using FBG. The seed source 1 outputs seed light with the pulse peak value of 10mW, the pulse width of 5ns, the repetition frequency of 100kHz and the wavelength of 1550nm, and the seed light enters a pre-amplification stage through ports 1 to 2 of the optical fiber circulator 2. The single-mode optical fiber semiconductor pumping source outputs continuous pumping light with the wavelength of 974nm and the seed light and the pumping light enter the erbium-doped gain optical fiber through the wavelength division multiplexer 4 for primary amplification. The amplified output enters a fiber bragg grating 6 (FBG). The FBG has a reflection wavelength of 1550nm and a reflection bandwidth of 1nm. The residual pump light and ASE light in the gain fiber are transmitted through the FBG to be output, and the amplified seed light is reflected by the FBG to enter the gain fiber again to complete double-pass amplification. The pre-amplified output laser pulse peak value is 100W, and other parameters are unchanged and enter an acousto-optic modulator 7 (AOM) through ports 2 to 3 of the circulator. The peak value of the AOM modulation signal is 5V, the pulse width is 50 mus, the repetition frequency is 100kHz, and the delay is 5 mus with the seed source 1 pulse modulation signal, as shown in figure 2. The peak power of the laser pulse after passing through the AOM is 50W, and other parameters are unchanged. The multimode fiber semiconductor pump source outputs continuous 3W pump light with the wavelength of 974 nm. The output of the pre-amplification stage and the pump light are injected into the erbium ytterbium double-clad gain fiber through the fiber combiner 9 to complete power amplification, and the peak power is output by 2kW through the isolation filter 11 (IBPF).
A third embodiment of the present invention, which is an application example of the present invention and is described with reference to fig. 3 on the basis of the above embodiment.
FIG. 3 is a schematic diagram of a low time/frequency domain ASE noise pulsed fiber laser pre-amplification stage using BPF. The seed source 1 outputs seed light with a pulse peak value of 10mW, a pulse width of 5ns, a repetition frequency of 100kHz and a wavelength of 1550nm. The single-mode fiber semiconductor pumping source outputs continuous pumping light with the wavelength of 974nm and the seed light and the pumping light enter the erbium-doped gain fiber through the wavelength division multiplexer 4 for pre-amplification. The band-pass filter 12 transmits a wavelength of 1550nm and a bandwidth of 1nm. Residual pump light and ASE light in the gain fiber are filtered by the BPF, and amplified seed light is transmitted and output through the BPF. The pre-amplified output laser pulse peak value is 100W, and other parameters are unchanged and enter an acousto-optic modulator 7 (AOM). The peak value of the AOM modulation signal is 5V, the pulse width is 50 mus, the repetition frequency is 100kHz, and the delay is 5 mus with the seed source 1 pulse modulation signal, as shown in figure 2. The peak power of the laser pulse after passing through the AOM is 50W, and other parameters are unchanged. And then enters a power amplifier stage, in this embodiment, the structure of the power amplifier stage is the same as that in fig. 1, and the details are not repeated herein.
A fourth embodiment of the present invention is based on the above embodiments, and an application example of the present invention is described with reference to fig. 4.
Figure 4 is a schematic diagram of a low time/frequency domain ASE noise pulsed fiber laser pre-amplification stage using tilted FBGs. The seed source 1 outputs seed light with a pulse peak value of 10mW, a pulse width of 5ns, a repetition frequency of 100kHz and a wavelength of 1550nm. The single-mode fiber semiconductor pump source (i.e. the first pump source 3) outputs pump light with continuous 200mW and wavelength of 974nm, and the seed light and the pump light enter the erbium-doped gain fiber (i.e. the first gain fiber 5) through the wavelength division multiplexer 4 for pre-amplification. The inclined FBG (namely the optical fiber Bragg grating 6) has the transmission wavelength of 1550nm, the transmission bandwidth of 1nm and the refraction angle of 90 degrees +/-15 degrees. The isolation filter 11 operates at 1550nm. The residual pump light and ASE light in the gain fiber are refracted by the fiber Bragg grating 6 to be led out of the fiber, and the amplified seed light is transmitted by the inclined FBG and output by the isolator. The pre-amplified output laser pulse peak value is 100W, and other parameters are unchanged and enter an acousto-optic modulator 7 (AOM). The peak value of the AOM modulation signal is 5V, the pulse width is 50 mus, the repetition frequency is 100kHz, and the delay is 5 mus with the seed source 1 pulse modulation signal, and reference can be made to figure 2 again. The peak power of the laser pulse after passing through the AOM is 50W, and other parameters are unchanged. And then enters a power amplification stage, and the structure of the power amplification stage is the same as that of the power amplification stage in figure 1. In particular, the tilted FBG can be directly written on the isolator fiber, enabling integration.
In summary, compared to the prior art, the present invention has at least the following advantages:
the invention can filter ASE component in frequency time/domain by adjusting spectrum band-pass parameter of Fiber Bragg Grating (FBG) or band-pass filter (BPF) and opening time sequence signal of acousto-optic modulator, which is beneficial to realizing pulse output with large energy or high peak power in the amplifying process, improving signal-to-noise ratio of laser output and improving efficiency of laser.
While the present invention has been described in connection with the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (5)
1. A pulsed fiber laser for ASE noise in low time-frequency domain, comprising: the device comprises a seed source, a first pumping source, a wavelength division multiplexer, a first gain fiber and a filtering structure;
the wavelength division multiplexer is used for combining and transmitting the seed light emitted by the seed source and the first pump light emitted by the pump source;
the first gain optical fiber is used for pre-amplifying the gain of the light beam combining output by the wavelength division multiplexer;
the filtering structure is used for filtering ASE noise in a time domain and a frequency domain in the beam combination light and outputting the processed pre-amplification level optical signal.
2. The pulsed fiber laser of low time-frequency domain ASE noise according to claim 1, wherein the laser further comprises an amplification stage structure comprising a second pump source, a fiber combiner, a second gain fiber, an isolation filter;
the optical fiber beam combiner is used for receiving the pre-amplification level optical signal, combining the pre-amplification level optical signal with the pump light emitted by the second pump source and transmitting the combined pre-amplification level optical signal and the pump light;
the second gain optical fiber is used for amplifying the beam combining light output by the optical fiber beam combiner for gain;
the isolation filter is used for ensuring forward transmission of the current optical signal, isolating reflected light and filtering redundant pump light.
3. The pulsed fiber laser of low time-frequency domain ASE noise according to claim 1, wherein the filtering structure comprises: fiber bragg gratings, acousto-optic modulators;
the fiber Bragg grating is used for filtering ASE noise and redundant pump light in the beam combination optical frequency domain;
the acousto-optic modulator is used for filtering continuous ASE noise between current optical signal pulses.
4. The low time-frequency domain ASE-noise pulsed fiber laser of claim 3, further comprising: and the optical fiber circulator is respectively connected with the seed source, the first pumping source and the wavelength division multiplexer, is used for transmitting the seed light and the output of the pre-amplification stage, limits the current optical signal to be transmitted in a single direction, and isolates the reflected light.
5. The pulsed fiber laser of low time-frequency domain ASE noise according to claim 1, wherein the filtering structure comprises: band-pass filter, acousto-optic modulator;
the band-pass filter is used for filtering ASE noise and redundant pump light in the beam combination optical frequency domain;
the acousto-optic modulator is used for filtering continuous ASE noise between current optical signal pulses.
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| CN202310250310.8A CN115966991A (en) | 2023-03-16 | 2023-03-16 | Pulse fiber laser of low time-frequency domain ASE noise |
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| CN202310250310.8A CN115966991A (en) | 2023-03-16 | 2023-03-16 | Pulse fiber laser of low time-frequency domain ASE noise |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1734622A1 (en) * | 2005-06-13 | 2006-12-20 | Keopsys | Methods of reduction of amplified spontaneous emission (ASE) in pulsed Master Oscillator Pulsed Amplifier (MOPA) fiber laser systems |
| CN204732669U (en) * | 2015-02-12 | 2015-10-28 | 北京工业大学 | A kind of single-frequency nanosecond pulse full optical fiber laser amplifying device |
| CN110600978A (en) * | 2019-10-21 | 2019-12-20 | 北京工业大学 | Ytterbium-doped nanosecond pulse line laser source based on all-fiber structure |
| CN214411749U (en) * | 2020-12-30 | 2021-10-15 | 济南量子技术研究院 | Single-frequency pulse optical fiber amplifier with high stability and low noise |
| CN218275503U (en) * | 2022-11-30 | 2023-01-10 | 武汉灵途传感科技有限公司 | High-power 1550nmMOPA pulse optical fiber laser |
-
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- 2023-03-16 CN CN202310250310.8A patent/CN115966991A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1734622A1 (en) * | 2005-06-13 | 2006-12-20 | Keopsys | Methods of reduction of amplified spontaneous emission (ASE) in pulsed Master Oscillator Pulsed Amplifier (MOPA) fiber laser systems |
| CN204732669U (en) * | 2015-02-12 | 2015-10-28 | 北京工业大学 | A kind of single-frequency nanosecond pulse full optical fiber laser amplifying device |
| CN110600978A (en) * | 2019-10-21 | 2019-12-20 | 北京工业大学 | Ytterbium-doped nanosecond pulse line laser source based on all-fiber structure |
| CN214411749U (en) * | 2020-12-30 | 2021-10-15 | 济南量子技术研究院 | Single-frequency pulse optical fiber amplifier with high stability and low noise |
| CN218275503U (en) * | 2022-11-30 | 2023-01-10 | 武汉灵途传感科技有限公司 | High-power 1550nmMOPA pulse optical fiber laser |
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