CN211700915U - Incoherent narrow linewidth light source - Google Patents
Incoherent narrow linewidth light source Download PDFInfo
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- CN211700915U CN211700915U CN202020560688.XU CN202020560688U CN211700915U CN 211700915 U CN211700915 U CN 211700915U CN 202020560688 U CN202020560688 U CN 202020560688U CN 211700915 U CN211700915 U CN 211700915U
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- circulator
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- band filter
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Abstract
The utility model relates to the field of optical technology, especially, relate to an incoherent narrow linewidth light source. The ASE optical fiber circulator comprises an ASE light source, a circulator (105), a first tunable narrow-band filter (106), a two-way amplifier and an output optical fiber (111), wherein the ASE light source is optically connected with a first port of the circulator (105), one end of the first tunable narrow-band filter (106) is optically connected with the two-way amplifier, the other end of the first tunable narrow-band filter (106) is optically connected with a second port of the circulator (105), and the output optical fiber (111) is connected with an output port of the circulator (105). The incoherent narrow linewidth light source has low coherence and high side mode suppression ratio.
Description
Technical Field
The utility model relates to the field of optical technology, especially, relate to an incoherent narrow linewidth light source.
Background
In the fields of spectrum detection, atomic laser cooling, spectrum synthesis and the like, a narrow linewidth laser with tunable central wavelength in a wide spectrum range is required.
There are three main ways of obtaining such a light source conventionally:
1) the scheme of the single-frequency laser and the phase modulation spectrum broadening is characterized in that the coherence of a light source is very high, but the adjustable range of the central wavelength of the single-frequency laser is only 1nm to 2nm generally through a thermal tuning mode;
2) the narrow line width fiber grating pair oscillator scheme is characterized in that a resonant cavity is formed by a high-reflection fiber grating pair and a low-reflection fiber grating pair with narrow line width, the central wavelength is selected and narrowed by utilizing the transmittance spectrum of the gratings, the coherence of the light source is slightly lower than that of the first scheme, and the wavelength tunable range of the same gratings is within 1 nm;
3) the ring cavity scheme of the tunable filter is inserted, the filter adopts a method of white filtering, the tuning of the central wavelength can be realized in a range of tens of nm, and the coherence of the light source is equivalent to that of a second light source.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: an incoherent narrow linewidth light source with low coherence and high side mode suppression ratio is provided.
The utility model adopts the technical proposal that: an incoherent narrow-line-width light source comprises an ASE light source, a circulator, a first tunable narrow-band filter, a two-way amplifier and an output optical fiber, wherein the ASE light source is optically connected with a first port of the circulator, one end of the first tunable narrow-band filter is optically connected with the two-way amplifier, the other end of the first tunable narrow-band filter is optically connected with a second port of the circulator, and the output optical fiber is connected with an output port of the circulator.
Preferably, the ASE light source comprises an angular end cap, and the angle of the angular end cap minus is 6-10 °.
Preferably, the angle end cap has a minus angle of 8 °.
Preferably, a dichroic mirror or a band-pass filter is arranged in the circulator or the two-way amplifier.
Preferably, it further comprises a second tunable narrow-band filter disposed between the two-way amplifier and the circulator.
Preferably, the two-way amplifier includes an amplifier gain fiber, an amplifier pump combiner, an amplifier pump source and an amplifier mirror, the first tunable narrowband filter, the amplifier gain fiber, the amplifier pump combiner, the second tunable narrowband filter and the amplifier mirror are sequentially optically connected, and the amplifier pump source is optically connected with the amplifier pump combiner.
Compared with the prior art in the structure more than adopting, the utility model has the advantages of it is following: the ASE light source is used as a main oscillator, and seed laser with wide spectrum and low coherence can be obtained; moreover, a tunable narrow-band filter is inserted into the two-way amplifier, so that a narrow-line-width light source with adjustable central wavelength can be obtained; and the signal laser passes through the tunable narrow-band filter twice, so that the extremely high spectral signal-to-noise ratio of the signal light is ensured, and meanwhile, the gain of the amplifier can be effectively improved through double-pass amplification.
The use of such a reflection-reducing angled end cap prevents return light from entering the core.
Unwanted out-of-band spectra are further suppressed by inserting dichroic mirrors or band pass filters at the designed band.
And a second tunable narrow-band filter is arranged and combined with the first tunable narrow-band filter to further reduce the line width of the signal, or two tunable filters with wider bandwidths are used for realizing laser output with narrower line width.
And the first tunable narrow-band filter and the second tunable narrow-band filter are respectively arranged at two sides of the pumping beam combiner of the amplifier, so that the phenomenon that the signal in the amplifier is weak and ASE is increased due to overlarge single pass loss can be prevented.
Dust collection in the circulator provides an isolator function, which prevents the signal light returning oscillator of the amplifier from interfering with the operation of the ASE light source.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of an incoherent narrow linewidth light source of the present invention.
Fig. 2 is a schematic diagram of a second embodiment of an incoherent narrow linewidth light source of the present invention.
As shown in the figure: 101. a corner end cap; 102. ASE light source gain fiber; 103. ASE light source pumping beam combiner; 104. ASE light source pumping source; 105. a circulator; 106. a first tunable narrow band filter; 107. an amplifier gain fiber; 108. an amplifier pumping combiner; 109. an amplifier pump source; 110. an amplifier mirror; 111. an output optical fiber; 112. a second tunable narrow band filter.
Detailed Description
The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to the following specific embodiments.
The first embodiment is as follows: as shown in fig. 1: an incoherent narrow linewidth light source comprises an angular end cap 101, an ASE light source gain fiber 102, an ASE light source pump beam combiner 103, an ASE light source pump source 104, a circulator 105, a first tunable narrow-band filter 106, an amplifier gain fiber 107, an amplifier pump beam combiner 108, an amplifier pump source 109, an amplifier reflector 110 and an output fiber 111; wherein:
the angle end cap 101, the ASE light source gain fiber 102, the ASE light source pumping combiner 103 and the ASE light source pumping source 104 form an ASE light source, the angle end cap 101, the ASE light source gain fiber 102 and the ASE light source pumping combiner 103 are sequentially optically connected, the ASE light source pumping source 104 is connected to the ASE light source pumping combiner 103, the ASE light source pumping combiner 103 is further connected with a first port of a circulator 105, wherein the angle end cap 101 is cut by 8 degrees to prevent return light from entering a fiber core, the length of the ASE light source gain fiber 102 can be selected and optimized according to a required spectral range, the power of the ASE light source pumping source 104 is generally within a watt level, self-excitation is easily caused due to overhigh power, and other components are conventional in the prior art and are not developed in detail herein;
the amplifier gain fiber 107, the amplifier pumping beam combiner 108, the amplifier pumping source 109 and the amplifier reflector 110 form a double-pass amplifier, the amplifier gain fiber 107, the amplifier pumping beam combiner 108 and the amplifier reflector 110 are sequentially optically connected, the amplifier pumping source 109 is optically connected with the amplifier pumping beam combiner 108, the structure of the double-pass amplifier is also more conventional, the working principle of the double-pass amplifier is that light is amplified once after being amplified and then is reflected by a reflector, and thus double-pass amplification is realized;
the first tunable narrowband filter is arranged between the circulator 105 and the two-way amplifier, specifically between the second port of the circulator 105 and the amplifier gain fiber 107, the signal light from the second port of the circulator 105 is first filtered out a narrowband seed source by the first tunable narrowband filter 106, amplified by the amplifier gain fiber 107, reflected by the amplifier reflector 110 after being amplified in the first way, amplified again, and output through the output fiber 111 connected to the circulator 105 again, and is used by a later stage or further amplified.
The second embodiment is different from the first embodiment in that the second embodiment further includes a second tunable narrow-band filter 112, as shown in fig. 2, the second tunable narrow-band filter 112 is specifically disposed between the amplifier mirror 110 and the amplifier pump combiner 108, so that the second tunable narrow-band filter 112 can be combined with the first tunable narrow-band filter 106 to further reduce the line width of the signal. And first tunable narrowband filter 106 and second tunable narrowband filter 112 are not directly connected in series to prevent single pass loss from being excessive, resulting in weak signal and increased ASE in the amplifier.
The third concrete embodiment: the difference from the first embodiment is that all the optical fibers in the third embodiment can use polarization-maintaining optical fibers, so that if a polarized light source is needed, the polarization-maintaining optical fibers and the corresponding polarization-maintaining optical fiber devices can be used.
Fourth embodiment, the difference from the first embodiment is that all the gain fibers, such as the ASE light source gain fiber 102 and the amplifier gain fiber 107, can be doped differently, the tunable range of the ytterbium-doped fiber is from 1010nm to 1090nm, and the tunable range of the erbium-doped fiber is from 1520nm to 1600 nm; the tunable range of the thulium doped fiber is from 1850nm to 2050 nm. The bandwidth which can be realized by a single ASE light source is limited, the adjustable spectrum range can be divided into two to three sections according to requirements, and the ASE light sources optimized by respective spectrum sections are respectively adopted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (6)
1. An incoherent narrow linewidth light source, characterized in that: the ASE optical fiber circulator comprises an ASE light source, a circulator (105), a first tunable narrow-band filter (106), a two-way amplifier and an output optical fiber (111), wherein the ASE light source is optically connected with a first port of the circulator (105), one end of the first tunable narrow-band filter (106) is optically connected with the two-way amplifier, the other end of the first tunable narrow-band filter (106) is optically connected with a second port of the circulator (105), and the output optical fiber (111) is connected with an output port of the circulator (105).
2. An incoherent narrow linewidth light source in accordance with claim 1, wherein: the ASE light source comprises a corner end cap (101) and the angle of the corner end cap (101) is 6-10 °.
3. An incoherent narrow linewidth light source according to claim 2, wherein: the reflection reducing angle of the angle end cap (101) is 8 degrees.
4. An incoherent narrow linewidth light source in accordance with claim 1, wherein: a dichroic mirror or a band-pass filter is arranged in the circulator (105) or the two-way amplifier.
5. An incoherent narrow linewidth light source in accordance with claim 1, wherein: it further comprises a second tunable narrow-band filter (112), said second tunable narrow-band filter (112) being arranged between the two-way amplifier and the circulator (105).
6. An incoherent narrow linewidth light source according to claim 5, wherein: the two-way amplifier comprises an amplifier gain fiber (107), an amplifier pumping beam combiner (108), an amplifier pumping source (109) and an amplifier reflector (110), wherein the first tunable narrow-band filter (106), the amplifier gain fiber (107), the amplifier pumping beam combiner (108), the second tunable narrow-band filter (112) and the amplifier reflector (110) are sequentially in optical connection, and the amplifier pumping source (109) is in optical connection with the amplifier pumping beam combiner (108).
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| CN202020560688.XU CN211700915U (en) | 2020-04-16 | 2020-04-16 | Incoherent narrow linewidth light source |
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| CN202020560688.XU CN211700915U (en) | 2020-04-16 | 2020-04-16 | Incoherent narrow linewidth light source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114900242A (en) * | 2022-07-14 | 2022-08-12 | 西安炬光科技股份有限公司 | Optical path structure, optical relay device, and fiber laser |
| CN116914540A (en) * | 2023-07-21 | 2023-10-20 | 武汉光至科技有限公司 | Optical fiber laser with special wavelength |
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2020
- 2020-04-16 CN CN202020560688.XU patent/CN211700915U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114900242A (en) * | 2022-07-14 | 2022-08-12 | 西安炬光科技股份有限公司 | Optical path structure, optical relay device, and fiber laser |
| CN116914540A (en) * | 2023-07-21 | 2023-10-20 | 武汉光至科技有限公司 | Optical fiber laser with special wavelength |
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