CN111446609A - High-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin fiber laser - Google Patents
High-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin fiber laser Download PDFInfo
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06787—Bidirectional amplifier
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- H—ELECTRICITY
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- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06791—Fibre ring lasers
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1061—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using a variable absorption device
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
Abstract
The invention relates to a high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin fiber laser, which comprises a bidirectional erbium-doped fiber amplifier (EDFA), a Single Mode Fiber (SMF), a high-birefringence saturable absorption ring, an optical circulator, a first optical coupler and a spectrum analyzer. The invention utilizes the linear structure with the high birefringence saturable absorption ring to effectively reduce the threshold power required by erbium-doped fiber pumping, and simultaneously increases the occurrence probability of spatial hole burning effect (SHB effect), the SHB effect can effectively inhibit the occurrence of modal competition, promote stable multi-wavelength oscillation, and respectively ensure the number of self-excited wavelengths and the high OSNR of multi-wavelength laser by the high birefringence effect and the saturable absorption narrow-band filtering characteristic in the high birefringence saturable absorption ring.
Description
Technical Field
The invention relates to the technical field of optical devices, in particular to a high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin optical fiber laser.
Background
The widespread use of Dense Wavelength Division Multiplexing (DWDM) in optical communication networks has led to the increased interest in multi-wavelength fiber lasers. The Brillouin optical fiber laser has the advantages of simple structure, narrow line width, stable multi-wavelength output capability, low cost and wide tunable range, and is concerned by more and more visible light internationally. The optical signal to noise ratio (OSNR) determines the quality of a laser signal, and particularly in WDM, OSNR is a crucial reference index, and the higher the OSNR, the less transmission errors, and conversely, the lower the OSNR, the higher the maintenance cost, the lower the service quality and the service life.
In the existing literature, the inventor searches and discovers that scholars at home and abroad (L, Opt. L et t., 30(5), pp.486-488, 2005, L, Opt. express.14, pp.10233-10238, October, 2006, Opt. express.14, pp.9731-9736, July, 2007, the invention patents proposed by Huangyou, Zhili and the like, with an authorization publication No. CN101257177A and a self-excitation multi-wavelength Brillouin erbium-doped fiber laser) all utilize a Sagnac loop mirror in the design, and combine the linear gain of EDF and the non-linear Brillouin gain of SMF to realize a self-excitation multi-wavelength erbium-doped fiber laser.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a high birefringence saturable absorption ring self-excited multi-wavelength high OSNR brillouin fiber laser, aiming at the above defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin optical fiber laser is constructed, and the high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin optical fiber laser comprises: the device comprises a bidirectional erbium-doped fiber amplifier EDFA (1), a single-mode fiber SMF (2), a high-birefringence saturable absorption ring (3), an optical circulator (4), a first optical coupler (5) and a spectrum analyzer (6);
the high-birefringence saturable absorption ring (3) comprises a second optical coupler (7), a first polarization controller (8), an unpumped erbium-doped fiber (9), a polarization-maintaining fiber (10) and a second polarization controller (11); one end of a polarization maintaining fiber (10) is connected to one end of an unpumped erbium-doped fiber (9), the other ends of the polarization maintaining fiber (10) and the unpumped erbium-doped fiber (9) are respectively connected with one ends of a first polarization controller (8) and a second polarization controller (11), and the other ends of the first polarization controller (8) and the second polarization controller (11) are connected with a second optical coupler (7) to form a closed loop;
the first output end of the bidirectional erbium-doped fiber amplifier EDFA (1) is connected with one end of the single-mode fiber SMF (2), and the other end of the single-mode fiber SMF (2) is connected with a second optical coupler (7) of the high-birefringence saturable absorption ring (3); the second output end of the bidirectional erbium-doped fiber amplifier EDFA (1) is connected with a port b of the optical circulator (4), ports c of the optical circulator (4) are connected to the input end of the first optical coupler (5), the input end of the first optical coupler (5) is provided with two output ends, one of the two output ends is connected with the optical spectrum analyzer (6), and the other output end is connected with a port a of the optical circulator (4);
the bidirectional erbium-doped fiber amplifier EDFA (1) generates amplified self-excitation wavelength, the amplified self-excitation wavelength is output from a first output end, Stokes light is generated through a single mode fiber SMF (2), enters a high birefringence saturable absorption ring (3) to return around a primary path, enters the bidirectional erbium-doped fiber amplifier EDFA (1) again to be amplified, the amplified light is output from a second output end, enters a c port through a b port of an optical circulator (4), a part of light is output to a spectrum analyzer (6) as probe light to be observed through the light splitting action of a first optical coupler (5), the rest part of light is output to an a port of the optical circulator, enters the bidirectional erbium-doped fiber amplifier EDFA (1) again through a b port, and resonance is continued.
Wherein, the output power of the bidirectional erbium-doped fiber amplifier EDFA is 500 mW.
The single-mode fiber SMF selects SM-28 single-mode fiber with the length of 10 km, and provides nonlinear Brillouin gain.
In the high-birefringence saturable absorption ring (3), the second optical coupler (7) is a 3 dB coupler, the length of the unpumped erbium-doped fiber (9) is 10 m, the length of the polarization-maintaining fiber (10) is 13 cm, and the self-excitation wavelength quantity and the high OSNR of the multi-wavelength laser are respectively ensured by utilizing the high-birefringence effect and the saturable absorption narrow-band filtering characteristic of the high-birefringence saturable absorption ring (3).
The first optical coupler (5) is a coupler with a splitting ratio of 10/90 and is used for outputting multi-wavelength laser and returning part of the multi-wavelength laser to the bidirectional erbium-doped fiber amplifier EDFA (1) for generating next-order Stokes light.
Wherein the spectrum analyzer adopts a C-band spectrum analyzer, and the resolution is 0.02 nm.
Different from the prior art, the high-birefringence saturable absorption ring self-excitation multi-wavelength high-OSNR Brillouin optical fiber laser comprises a bidirectional erbium-doped optical fiber amplifier EDFA, a single-mode optical fiber SMF, a high-birefringence saturable absorption ring, an optical circulator, a first optical coupler and an optical spectrum analyzer. The invention utilizes the linear structure with the high birefringence saturable absorption ring to effectively reduce the threshold power required by erbium-doped fiber pumping, and simultaneously increases the occurrence probability of spatial hole burning effect (SHB effect), the SHB effect can effectively inhibit the occurrence of modal competition, promote stable multi-wavelength oscillation, and respectively ensure the number of self-excited wavelengths and the high OSNR of multi-wavelength laser by the high birefringence effect and the saturable absorption narrow-band filtering characteristic in the high birefringence saturable absorption ring.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR brillouin fiber laser provided by the present invention.
In the figure, 1: an erbium-doped fiber amplifier EDFA; 2: a single mode fiber SMF; 3: a high birefringence saturable absorber ring; 4: an optical circulator; 5: an optical coupler; 6: a spectrum analyzer; 7: a second optical coupler; 8: a first polarization controller; 9: unpumped erbium doped fiber; 10: a polarization maintaining optical fiber; 11: a second polarization controller.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a high birefringence saturable absorption ring self-excited multi-wavelength high OSNR brillouin fiber laser, comprising: the device comprises a bidirectional erbium-doped fiber amplifier EDFA1, a single-mode fiber SMF2, a high-birefringence saturable absorption ring 3, an optical circulator 4, a first optical coupler 5 and a spectrum analyzer 6;
the high-birefringence saturable absorption ring 3 comprises a second optical coupler 7, a first polarization controller 8, an unpumped erbium-doped fiber 9, a polarization-maintaining fiber 10 and a second polarization controller 11; one end of a polarization maintaining fiber 10 is connected to one end of an unpumped erbium-doped fiber 9, the other ends of the polarization maintaining fiber 10 and the unpumped erbium-doped fiber 9 are respectively connected to one ends of a first polarization controller 8 and a second polarization controller 11, and the other ends of the first polarization controller 8 and the second polarization controller 11 are both connected to a second optical coupler 7 to form a closed loop;
a first output end of the bidirectional erbium-doped fiber amplifier EDFA1 is connected with one end of a single-mode fiber SMF2, and the other end of the single-mode fiber SMF2 is connected with a second optical coupler 7 of the high-birefringence saturable absorption ring 3; the second output end of the bidirectional erbium-doped fiber amplifier EDFA1 is connected with the port b of the optical circulator 4, the ports c of the optical circulator 4 are connected with the input end of the first optical coupler 5, the input end of the first optical coupler 5 is provided with two output ends, one of the two output ends is connected with the optical spectrum analyzer 6, and the other output end is connected with the port a of the optical circulator 4.
Wherein, the output power of the bidirectional erbium-doped fiber amplifier EDFA1 is 500 mW.
The single-mode fiber SMF2 selects an SM-28 single-mode fiber with the length of 10 km, and provides nonlinear Brillouin gain.
In the high birefringence saturable absorption ring 3, the second optical coupler 7 is a 3 dB coupler, the unpumped erbium-doped fiber 9 is 10 m in length, the polarization maintaining fiber 10 is 13 cm in length, and the self-excitation wavelength quantity and the high OSNR of the multi-wavelength laser are respectively ensured by utilizing the high birefringence effect and the saturable absorption narrow-band filtering characteristic of the high birefringence saturable absorption ring 3.
The first optical coupler 5 is a coupler with a splitting ratio of 10/90, and is used for outputting multi-wavelength laser and returning part of the multi-wavelength laser to the bidirectional erbium-doped fiber amplifier EDFA1 to generate next-order stokes light.
Wherein, the spectrum analyzer 6 adopts a C-band spectrum analyzer, and the resolution is 0.02 nm.
The principle of the high birefringence effect is as follows:
when an incident beam enters the 3 dB coupler, two beams of light beams which are transmitted oppositely are generated, and are recombined when passing through the polarization maintaining optical fiber, and finally the light beams return to the 3 dB coupler to realize coherent output. The selection of the output wavelength is realized by adjusting the PC to obtain a specific reflection spectrum.
The relation between the length of the polarization maintaining fiber and the bandwidth range is as follows (1):
the spacing between output wavelengths may be represented by equation (2):
wherein
In order to maintain the birefringence of the polarization maintaining fiber,Lin order to maintain the length of the polarization-maintaining fiber,
is the length of the central wavelength and is,
in order to find the range of the bandwidth,cin order to obtain the light speed in vacuum,
=
，
is that
The resulting beat length is measured.
From equation (1), it can be seen that the shorter the length of the polarization maintaining fiber, the larger the high birefringence saturable absorption loop bandwidth range, and from equation (2), it can be seen that the degree of density of the output wavelength interval is related to both L and L, and that the longer the wavelength interval, the denser the wavelength interval, and the larger the wavelength interval, so the number of output wavelengths increases with the increase of the bandwidth range.
The principle of the saturable absorption narrow-band filtering characteristic is as follows:
the saturable absorption ring splits incident light waves into two same waves, the two waves are then reversely propagated in the unpumped erbium-doped fiber, standing waves are formed, the unpumped erbium-doped fiber serves as an absorber, the saturable absorption effect of the unpumped erbium-doped fiber in a standing wave field is utilized, the absorption efficiency of the unpumped erbium-doped fiber is inversely proportional to light intensity, the stronger the light intensity is, the higher the absorption efficiency is, and conversely, the weaker the light intensity is, the lower the absorption efficiency is, so that the high optical signal-to-noise ratio of output laser is ensured. The spatial light intensity distribution can be easily determined as lambda/2 neffWhere λ is the center wavelength and 2neffIs the effective refractive index of the unpumped erbium doped fiber. Considering the energy level of erbium ion in two-level system4I15/2And4I13/2composition, wherein the saturation absorption coefficient can be expressed as:
wherein IsatDue to the difference in I (z) and the absorption coefficient α (z) of the spatially periodic distribution, resulting in a periodicity of the refractive indexThe spatial variation.
The unpumped EDF in the loop corresponds to an Λ = λ/2neffThe FBG fiber filter grating can finely select the mode of the external cavity effect formed by the laser, and the laser output with narrow line width is ensured. The full-width half-maximum (FWHM) bandwidth of an FBG fiber filter grating can be expressed as:
wherein N = Lg/Λ is the total number of grating periods, λ is the center wavelength at maximum reflectivity, LgIs the grating length, 2neffIs the effective index of the EDF and κ is the grating coupling coefficient.
When the device works, the bidirectional erbium-doped fiber amplifier EDFA1 generates amplified self-excitation wavelength, the amplified self-excitation wavelength is output from a first output end, Stokes light is generated through the single-mode fiber SMF2, enters the high-birefringence saturable absorption ring 3 to return around a primary path, enters the bidirectional erbium-doped fiber amplifier EDFA1 again to be amplified, the amplified light is output from a second output end, enters a port c through a port b of the optical circulator 4, is subjected to the light splitting action of the first optical coupler 5, a part of light is output to the optical spectrum analyzer 6 as probe light to be observed, the rest part of light is output to a port a of the optical circulator, enters the bidirectional erbium-doped fiber amplifier EDFA1 again through a port b, and continues to resonate.
When the gain provided by the bidirectional erbium-doped fiber amplifier EDFA1 and the intra-cavity loss reach a balance, the intra-cavity oscillation generates a self-excitation wavelength and is amplified by the bidirectional erbium-doped fiber amplifier EDFA1 to form first-order stokes light as initial pump light of the brillouin multi-wavelength under the nonlinear brillouin gain of the single-mode fiber SMF2, and the first-order stokes light returns to the single-mode fiber SMF2 after being surrounded for one circle in the high-birefringence saturable absorption ring 3 to serve as pump light of the next-order stokes light. Stokes light enters a first optical coupler 5 through a circulator 4, and is acted by the first optical coupler 5, part of the light is output to a spectrum analyzer 6 as probe light to be observed, and the rest part of the light is injected into a bidirectional erbium-doped fiber amplifier EDFA1 through the circulator 4 to continue oscillation, so that stable multi-wavelength high-OSNR output laser can be generated through the cascade connection mode.
The gain of the optical fiber laser is provided by the linear gain of an erbium-doped fiber amplifier EDFA and the cascade nonlinear Brillouin gain of single-mode fibers, the high birefringence effect and the saturable absorption narrow-band filtering characteristic of a high-birefringence saturable absorption ring are utilized to respectively ensure the number of self-excited wavelengths and the high OSNR of multi-wavelength lasers, and the average OSNR of 15 dB and about 180 pieces of high-OSNR output lasers can be obtained.
According to the technical scheme of the high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin optical fiber laser, the self-excited wavelength number and the multi-wavelength laser high-OSNR are respectively guaranteed by utilizing the high-birefringence effect and the saturable absorption narrowband filtering characteristic in the high-birefringence saturable absorption ring, and compared with the existing design, the high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR optical fiber laser has more wavelengths and better OSNR effect.
Compared with the existing erbium-doped fiber laser, the linear structure with the high-birefringence saturable absorption ring can effectively reduce the threshold power required by erbium-doped fiber pumping, and simultaneously increase the occurrence probability of the spatial hole burning effect (SHB effect), the SHB effect can effectively inhibit the occurrence of modal competition, promote stable multi-wavelength oscillation, and respectively ensure the number of self-excited wavelengths and the high OSNR of multi-wavelength laser due to the high birefringence effect and saturable absorption narrow-band filtering characteristic in the high-birefringence saturable absorption ring.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A high birefringence saturable absorption ring self-excited multi-wavelength high OSNR Brillouin fiber laser is characterized by comprising: the device comprises a bidirectional erbium-doped fiber amplifier EDFA (1), a single-mode fiber SMF (2), a high-birefringence saturable absorption ring (3), an optical circulator (4), a first optical coupler (5) and a spectrum analyzer (6);
the high-birefringence saturable absorption ring (3) comprises a second optical coupler (7), a first polarization controller (8), an unpumped erbium-doped fiber (9), a polarization-maintaining fiber (10) and a second polarization controller (11); one end of a polarization maintaining fiber (10) is connected to one end of an unpumped erbium-doped fiber (9), the other ends of the polarization maintaining fiber (10) and the unpumped erbium-doped fiber (9) are respectively connected with one ends of a first polarization controller (8) and a second polarization controller (11), and the other ends of the first polarization controller (8) and the second polarization controller (11) are connected with a second optical coupler (7) to form a closed loop;
the first output end of the bidirectional erbium-doped fiber amplifier EDFA (1) is connected with one end of the single-mode fiber SMF (2), and the other end of the single-mode fiber SMF (2) is connected with a second optical coupler (7) of the high-birefringence saturable absorption ring (3); the second output end of the bidirectional erbium-doped fiber amplifier EDFA (1) is connected with a port b of the optical circulator (4), ports c of the optical circulator (4) are connected to the input end of the first optical coupler (5), the input end of the first optical coupler (5) is provided with two output ends, one of the two output ends is connected with the optical spectrum analyzer (6), and the other output end is connected with a port a of the optical circulator (4);
the bidirectional erbium-doped fiber amplifier EDFA (1) generates amplified self-excitation wavelength, the amplified self-excitation wavelength is output from a first output end, Stokes light is generated through a single mode fiber SMF (2), enters a high birefringence saturable absorption ring (3) to return around a primary path, enters the bidirectional erbium-doped fiber amplifier EDFA (1) again to be amplified, the amplified light is output from a second output end, enters a c port through a b port of an optical circulator (4), a part of light is output to a spectrum analyzer (6) as probe light to be observed through the light splitting action of a first optical coupler (5), the rest part of light is output to an a port of the optical circulator, enters the bidirectional erbium-doped fiber amplifier EDFA (1) again through a b port, and resonance is continued.
2. A high birefringent saturable absorption ring self-excited multi-wavelength high OSNR brillouin fiber laser according to claim 1, wherein the output power of the bidirectional erbium doped fiber amplifier EDFA (1) is 500 mW.
3. The high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin fiber laser device according to claim 1, wherein the single-mode fiber SMF (2) is an SM-28 single-mode fiber with the length of 10 km, and provides nonlinear Brillouin gain.
4. The high birefringence saturable absorption ring self-excited multi-wavelength high OSNR Brillouin fiber laser according to claim 1, wherein in the high birefringence saturable absorption ring (3), the second optical coupler (7) is a 3 dB coupler, the length of the unpumped erbium-doped fiber (9) is 10 m, the length of the polarization maintaining fiber (10) is 13 cm, and the high birefringence effect and saturable absorption narrow band filtering characteristics of the high birefringence saturable absorption ring (3) are utilized to respectively ensure the number of self-excited wavelengths and the high OSNR of the multi-wavelength laser.
5. A high birefringent saturable absorption ring self-excited multi-wavelength high OSNR brillouin fiber laser according to claim 1, wherein the first optical coupler (5) is a coupler having a splitting ratio of 10/90, for outputting multi-wavelength laser light and returning most of the multi-wavelength laser light for generating next-order stokes light.
6. The high-birefringence saturable absorption ring self-excited multi-wavelength high-OSNR Brillouin fiber laser device according to claim 1, wherein the spectrum analyzer (6) adopts a C-band spectrum analyzer, and the resolution is 0.02 nm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336236A (en) * | 2021-11-15 | 2022-04-12 | 太原理工大学 | Ultra-narrow microwave photon generator based on self-excitation forward Brillouin fiber laser |
| CN114336236B (en) * | 2021-11-15 | 2023-02-10 | 太原理工大学 | Ultra-narrow microwave photon generator based on self-excitation forward Brillouin fiber laser |
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