CN107887785B - Single-frequency fiber laser with composite optical fiber and waveguide resonant ring - Google Patents
Single-frequency fiber laser with composite optical fiber and waveguide resonant ring Download PDFInfo
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- CN107887785B CN107887785B CN201711262005.1A CN201711262005A CN107887785B CN 107887785 B CN107887785 B CN 107887785B CN 201711262005 A CN201711262005 A CN 201711262005A CN 107887785 B CN107887785 B CN 107887785B
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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
- H01S3/05—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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre 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
- H01S3/05—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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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Abstract
A single-frequency fiber laser with a composite fiber and waveguide resonant ring relates to a fiber laser in the technical field of photoelectrons. The laser is characterized in that a double-straight-waveguide resonant ring structure is introduced into a linear resonant main cavity of the laser formed by sequentially connecting a Polarization Maintaining Fiber Bragg Grating (PMFBG), an Er-doped gain fiber and a high-reflection fiber Bragg grating (HRFBG) to serve as an annular sub-cavity, the silicon-based double-straight-waveguide resonant ring is connected between the Er-doped gain fiber and the high-reflection fiber Bragg grating (HRFBG), and single-frequency output is obtained by utilizing the mode cleaning effect of the annular sub-cavity.
Description
Technical Field
The invention relates to a fiber laser in the technical field of photoelectron, in particular to a single-frequency fiber laser compounded by an optical fiber and a waveguide resonant ring.
Background
The single-frequency optical fiber laser has the advantages of low pumping threshold power, high conversion efficiency, high coupling efficiency, narrow line width, small size and the like, and has wide application prospect and great application value in the fields of high-precision optical fiber sensing, coherent optical communication, high-speed dense wavelength division multiplexing communication systems, laser radars, high-resolution laser spectrums and the like.
In recent years, researchers have proposed a method for achieving single-frequency output of fiber lasers by using a short cavity method (QilaiZhao, Shanhui Xu, Kaijun Zhou, Changsheng Yang, Can Li, zhoumng Feng, Mingyi)The specific principles of ngPeng, Huaqiu Deng, and Zhongmin Yang, Broad-band width near-shot-noise-limited intensity noise suppression of a single-frequency fiber laser, Optics Letters, 41(2016), 1333 and 1335) are as follows: the pump light emitted by the semiconductor Laser (LD) is coupled into a resonant cavity by a Wavelength Division Multiplexer (WDM), and the resonant cavity is respectively composed of a narrow-band fiber Bragg grating (NB-FBG) and an Er3+/Yb3+The co-doped phosphate optical fiber is connected with a broadband fiber Bragg grating (WB-FBG), wherein the tail fiber of the idle broadband fiber Bragg grating (WB-FBG) end of the resonant cavity is cut into an angle of 8 degrees to eliminate the light reflection to the rear end face, and the laser output after passing through the resonant cavity is emitted through the narrowband fiber Bragg grating (NB-FBG) and is output through a Wavelength Division Multiplexer (WDM) and an optical Isolator (ISO). Er is needed to be adopted in the method3+/Yb3+Phosphate-codoped optical fibers make optical fibers expensive to manufacture and difficult to fuse with conventional silica fiber devices.
The Chinese invention patent 'a single-frequency fiber laser and its manufacturing method' (application number: 201611076624.7) discloses another single-frequency fiber laser and its manufacturing method, the single-frequency fiber laser includes a pump light source, a Wavelength Division Multiplexer (WDM), a gain fiber and an optical Isolator (ISO). The method comprises the steps that pumping light generated by a pumping light source is injected into a pumping port of a Wavelength Division Multiplexer (WDM), the pumping light is output from a common port of the WDM and enters a gain fiber, a phase-shift fiber grating and a high-reflection fiber grating are engraved on the gain fiber, the phase-shift fiber grating is used as an output coupler of a fiber laser, the phase-shift fiber grating, the gain fiber and the high-reflection fiber grating form a fiber laser resonant cavity, and generated laser is output from a signal port of the WDM through an optical Isolator (ISO). The single-frequency fiber laser utilizes the phase-shift fiber grating engraved on the gain fiber to suppress other laser longitudinal mode resonance through gain competition so as to realize single-frequency laser resonance. The scheme needs to etch a phase-shift fiber grating and a high-reflection fiber grating on a gain fiber, and the gain fiber has poor photosensitive property on the etching laser, so that the gain fiber needs to be subjected to low-temperature high-pressure H2The photosensitivity of the photosensitive material is enhanced by diffusion treatment, so that the implementation difficulty is high and the cost is high; and, due to the corresponding longitudinal modeThe interval is small, and the optimization of the laser resonance efficiency by adjusting the phase shift length of the phase shift fiber grating is not easy to realize.
Disclosure of Invention
The invention aims to solve the defect of high implementation difficulty in the background technology, and researches and designs a single-frequency fiber laser with a composite fiber and waveguide resonant ring, wherein the laser is formed by sequentially connecting a Polarization Maintaining Fiber Bragg Grating (PMFBG), an Er-doped gain fiber and a high-reflectivity fiber Bragg grating (HRFBG), and a double-straight-waveguide resonant ring (add-drop micro resonator) structure is introduced into a linear resonant main cavity of the laser to serve as an annular sub-cavity, wherein the coupling coefficient between an upper straight waveguide and a ring waveguide is the same as that between a lower straight waveguide and the ring waveguide, the silicon-based double-straight-waveguide resonant ring is connected between the Er-doped gain fiber and the high-reflectivity fiber Bragg grating (HRFBG), and single-frequency output is obtained by utilizing the mode cleaning effect of the annular sub-cavity.
The technical scheme of the invention is as follows:
a single-frequency fiber laser with a composite fiber and waveguide resonant ring comprises a semiconductor Laser (LD), a Polarization Maintaining Fiber Bragg Grating (PMFBG), an Er-doped gain fiber, a waveguide resonant ring, a High Reflection Fiber Bragg Grating (HRFBG), a Wavelength Division Multiplexer (WDM) and an optical Isolator (ISO);
the semiconductor Laser (LD) is used as a pumping source and connected with a pumping end of a Wavelength Division Multiplexer (WDM), a common end of the WDM is connected with one end of a Polarization Maintaining Fiber Bragg Grating (PMFBG), a signal end of the WDM is connected with an input end of an optical Isolator (ISO), the other end of the Polarization Maintaining Fiber Bragg Grating (PMFBG) is connected with one end of an Er-doped gain fiber, a right lower straight waveguide port of a waveguide resonance ring is connected with the other end of the Er-doped gain fiber, and a right upper straight waveguide port of the waveguide resonance ring is connected with one end of a High Reflection Fiber Bragg Grating (HRFBG);
the semiconductor Laser (LD) inputs pump light at a pumping port of a Wavelength Division Multiplexer (WDM), the pump light is output to one end of a Polarization Maintaining Fiber Bragg Grating (PMFBG) through a common port of the WDM, the pump light is output to an Er-doped gain fiber through the other end of the Polarization Maintaining Fiber Bragg Grating (PMFBG), and oscillation laser passing through the gain fiber is input to a right lower straight waveguide port of a waveguide resonant ring; based on the transconductance coupling coefficients of the lower straight waveguide and the ring waveguide, part of input oscillation laser enters a left half ring of the ring waveguide through a coupling region of the ring waveguide and the lower straight waveguide, the rest is output from a left port of the lower straight waveguide, when the light wave entering the left half ring passes through the coupling region of the ring waveguide and the upper straight waveguide, part of the light enters the upper straight waveguide through the coupling region and is output through a right port of the upper straight waveguide, the rest of the light enters the coupling region of the ring waveguide and the lower straight waveguide through a right half ring, based on the transconductance coupling coefficients of the upper straight waveguide and the ring waveguide, in the coupling region, the light frequency with the phase delay of 2 pi integral multiple is transmitted along the left half ring of the waveguide, the rest of the light enters the left half ring through the coupling region based on the transconductance coupling coefficients of the lower straight waveguide and the ring waveguide, and the rest of the light is output through;
the light wave output from the right port of the upper straight waveguide is reflected by a high-reflectivity fiber Bragg grating (HRFBG) to form a light wave with a set wavelength, then enters a coupling area of the upper straight waveguide and the ring waveguide, part of the light enters a left half ring of the ring waveguide based on the transconductance coupling coefficient of the upper straight waveguide and the ring waveguide, and the rest of the light is output from the left port of the upper straight waveguide; when light entering the left half ring of the ring waveguide reaches the coupling region of the ring waveguide and the lower straight waveguide, based on the transconductance coupling coefficients of the lower straight waveguide and the ring waveguide, part of the light is output from the right port of the lower straight waveguide, and the rest light enters the right half ring of the ring waveguide through the Er-doped gain fiber; the light wave entering the Er-doped gain fiber is input into the common end of the wavelength division multiplexer through a Polarization Maintaining Fiber Bragg Grating (PMFBG), then is input into the optical isolator through the signal end of the wavelength division multiplexer, and the optical isolator outputs stable single-frequency laser; when the light wave entering the right half ring of the ring waveguide reaches the coupling area of the upper straight waveguide and the ring waveguide, the light frequency with the phase delay of 2 pi integral multiple enters the left half ring, the rest light enters the left half ring through the coupling area based on the transconductance coupling coefficient of the upper straight waveguide and the ring waveguide, and the rest light is output through the left port of the upper straight waveguide.
Further, the waveguide resonant ring comprises an upper straight waveguide, a lower straight waveguide and a ring waveguide positioned between the upper straight waveguide and the lower straight waveguide. The ring waveguide is used as an annular sub-cavity, a certain power coupling ratio is formed between the upper straight waveguide and the lower straight waveguide and the ring waveguide, the condition that coherent phase length can be formed when the oscillating light in the ring waveguide and the oscillating light in the linear resonance main cavity have the same frequency and the phase difference is 2 pi integral multiple is met, and therefore the annular sub-cavity has the mode cleaning effect.
Further, the transconductance coupling coefficient between the upper straight waveguide and the ring waveguide is 50%, and the transconductance coupling coefficient between the lower straight waveguide and the ring waveguide is 50%.
Further, the waveguide resonant ring adopts LiNbO3Si-based (SiO)2SOI), III-V group semiconductors, polymers, and the like.
Preferably, the Polarization Maintaining Fiber Bragg Grating (PMFBG) has a certain transmittance for a laser wavelength near 1.55 μm, and is used for output coupling of the laser, so that the polarization characteristic of the output laser is also ensured.
Further, the Highly Reflective Fiber Bragg Grating (HRFBG) has high reflection characteristics for laser wavelength around 1.55 μm,
further, the reflection peaks of the Polarization Maintaining Fiber Bragg Grating (PMFBG) and the High Reflection Fiber Bragg Grating (HRFBG) are superposed.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a single-frequency fiber laser with a composite fiber and waveguide resonant ring, which is characterized in that a double-straight waveguide resonant ring (add-drop resonant ring) structure is introduced into a linear resonant main cavity of the laser formed by sequentially connecting a Polarization Maintaining Fiber Bragg Grating (PMFBG), an Er-doped gain fiber and a high-reflectivity fiber Bragg grating (HRFBG) to serve as an annular sub-cavity, the waveguide resonant ring is connected between the Er-doped gain fiber and the high-reflectivity fiber Bragg grating (HRFBG), and single-frequency output is obtained by utilizing the mode cleaning effect of the annular sub-cavity.
2. In the single-frequency fiber laser with the composite optical fiber and waveguide resonant ring, the optical wave transmitted around the ring in the ring waveguide can form resonance in the ring for meeting the optical frequency with phase delay of 2 pi integral multiple, and the power transmitted to the left ports of the upper and lower straight waveguides can be zero by reasonably selecting the coupling coefficient between the straight waveguides and the ring waveguide due to the multi-beam interference effect; meanwhile, for the light frequency which satisfies the phase delay of integral multiple of 2 pi, when viewed from the outside of the waveguide resonant ring, the light is input from the right end of the upper straight waveguide and output through the right end of the lower straight waveguide, and the light is input from the right end of the lower straight waveguide and output through the right end of the upper straight waveguide, and no light power loss exists; for the optical frequency which does not meet the condition that the phase delay is integral multiple of 2 pi, part of the light is transmitted along the ring based on the transconductance coupling coefficient of the upper straight waveguide and the ring waveguide or the transconductance coupling coefficient of the lower straight waveguide and the ring waveguide, and the rest light is output at the left port of the upper straight waveguide or the lower straight waveguide to form laser loss. In the single-frequency fiber laser provided by the invention, the laser mode meeting the ring waveguide resonance condition forms oscillation in the laser resonant cavity, and other modes are inhibited due to higher loss, so that single-frequency laser output is obtained.
Drawings
FIG. 1 is a schematic structural diagram of a single-frequency fiber laser with a composite fiber and waveguide resonant ring according to the present invention; the optical fiber laser comprises a 1-waveguide resonant ring, a 2-High Reflection Fiber Bragg Grating (HRFBG), a 3-Er-doped gain fiber, a 4-Polarization Maintaining Fiber Bragg Grating (PMFBG), a 5-Wavelength Division Multiplexer (WDM), a 6-semiconductor Laser (LD) and a 7-optical Isolator (ISO);
FIG. 2 is a schematic diagram of an optical path structure of a waveguide resonant ring according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of mode cleaning of a waveguide resonating ring in an embodiment of the present invention.
Detailed Description
The invention is further described in the following with reference to the drawings and examples, and it should be noted that the scope of the invention as claimed is not limited to the examples.
In this embodiment mode:
waveguide resonant ring 1: in SiO2The upper and lower straight waveguides and the resonant ring are manufactured on the waveguide, so that the loss is not obviously increasedIn the case of (2), the diameter of the ring can be within 18mm, SiO2The diameter of the waveguide mode field can be designed to be about 6 mu m, the dimension of the waveguide mode field is kept to be matched with the size of the mode field in the highly-doped Er fiber, and the coupling coefficient between the upper straight waveguide and the ring waveguide is equal to that between the lower straight waveguide and the ring waveguide.
High Reflection Fiber Bragg Grating (HRFBG)2 and Polarization Maintaining Fiber Bragg Grating (PMFBG) 4: the mode field size matching in the whole laser resonant cavity is ensured based on HI1060 and PM980 optical fiber manufacturing respectively.
Er-doped gain fiber 3: the OFS EDF150LD type highly Er-doped fiber has greatly increased Yb sensitized particle doping concentration, and the requirement of efficient pump light absorption can be met by preliminarily estimating the length of the gain fiber in centimeter magnitude.
Semiconductor Laser (LD) 6: as a pump source, the output pump wavelength was 976 nm.
Examples
Fig. 1 is a schematic diagram of the working principle of the present invention, a semiconductor Laser (LD)6 inputs pump light with a wavelength of 976nm at a pump port of a Wavelength Division Multiplexer (WDM)5, the pump light is output to one end of a Polarization Maintaining Fiber Bragg Grating (PMFBG)4 through a common port of the Wavelength Division Multiplexer (WDM)5, the pump light is output to an Er-doped gain fiber 3 through the other end of the Polarization Maintaining Fiber Bragg Grating (PMFBG)4, and laser gain is formed therein.
In the fiber laser, the oscillation laser passing through the gain fiber from right to left is input from the right port of the straight waveguide under the waveguide resonant ring 1, and the optical path of the light wave in the waveguide resonant ring can refer to fig. 2. The light wave output from the right port of the straight waveguide on the waveguide resonant ring 1 is selectively reflected by a high-reflectivity fiber Bragg grating (HRFBG)2 to be positioned at the wavelength near 1.55 mu m, and the reflected light wave is input from the right port of the straight waveguide on the waveguide resonant ring 1. The resonant optical frequency is formed in the resonant ring, lossless output is realized from the right port of the straight waveguide below the waveguide resonant ring 1, the lossless output is transmitted to a Polarization Maintaining Fiber Bragg Grating (PMFBG)4 through an Er-doped gain fiber 3, and stable single-frequency laser is output from an optical Isolator (ISO)7 through a signal port of a Wavelength Division Multiplexer (WDM) 5.
Wherein, the reflection peaks of the Polarization Maintaining Fiber Bragg Grating (PMFBG) and the High Reflection Fiber Bragg Grating (HRFBG) are superposed and are both positioned near 1.55 μm, and the reflection spectrum width is narrower.
The coupling between the waveguide and between the waveguide and the optical fiber needs to keep the size of the mode field consistent. The invention has small transmission distance of laser in two optical fibers and small loss, and the connection of devices can adopt a mode of dispensing and curing after mode accurate alignment, thereby realizing low-loss connection.
Wherein, the mode cleaning effect of waveguide resonant ring can calculate and obtain the right port input from the straight waveguide of top according to the theory of multi-beam interference, and when the right port output from the straight waveguide of bottom, the ratio of output light intensity to input light intensity is:
the mode is also suitable for the condition of inputting from the right port of the lower straight waveguide and outputting from the right port of the upper straight waveguide, wherein the transconductance coupling coefficient from the lower straight waveguide to the waveguide ring is delta, the non-transconductance coupling coefficient is gamma, the transconductance coupling coefficient from the upper straight waveguide to the waveguide ring is α, the non-transconductance coupling is β, and the optical lengths of the right half ring and the left half ring are respectively l1And l2The mode cleaning principle of the annular sub-cavity is explained from the perspective of resonant cavity filter response, wherein the filter response is as shown in fig. 3, (a) the graph is the resonant frequency spectrum of the annular sub-cavity, the cavity length is short, the longitudinal mode interval is large, and the eigen-mode line width is wide, (b) the graph is the resonant frequency spectrum of the linear resonant main cavity, the cavity length is long, the longitudinal mode interval is small, the eigen-mode line width is small, and the dotted line is the reflection spectrum of the polarization-maintaining fiber FBG, (c) the graph is the comprehensive filter response of two cavities, and only the laser frequency meeting the resonance conditions of the two cavities can start vibration.
In fig. 3, the diameter of the annular sub-cavity is 18mm, the length of the main linear resonant cavity is 100mm, and the coupling coefficient between the straight waveguide and the annular waveguide is 50%, that is, δ γ α β% 50%.
The invention combines a waveguide resonant ring and an optical fiber resonant cavity, and provides a single-frequency optical fiber laser with an optical fiber and a waveguide resonant ring combined. The waveguide resonant ring is used as an annular resonant cavity of the laser, the waveguide resonant ring is inserted between the Er-doped gain fiber and the high-reflectivity fiber Bragg grating (HRFBG) in the fiber resonant main cavity, the resonant cavity is kept to be of a linear cavity structure as a whole, the waveguide resonant ring is used as the annular resonant cavity of the laser, the mode cleaning effect is achieved, only the laser frequency meeting the resonant conditions of the two cavities can start to vibrate, and stable single-frequency laser output can be achieved.
Claims (3)
1. A single-frequency fiber laser with a composite fiber and waveguide resonant ring comprises a semiconductor laser, a polarization maintaining fiber Bragg grating, an Er-doped gain fiber, a waveguide resonant ring, a high-reflectivity fiber Bragg grating, a wavelength division multiplexer and an optical isolator;
the semiconductor laser is used as a pumping source and connected with a pumping end of the wavelength division multiplexer, a common end of the wavelength division multiplexer is connected with one end of a polarization maintaining fiber Bragg grating, a signal end of the wavelength division multiplexer is connected with an input end of an optical isolator, the other end of the polarization maintaining fiber Bragg grating is connected with one end of an Er-doped gain fiber, a right lower straight waveguide port of a waveguide resonance ring is connected with the other end of the Er-doped gain fiber, and a right upper straight waveguide port of the waveguide resonance ring is connected with one end of a high-reflectivity fiber Bragg grating;
the semiconductor laser inputs pump light at a pumping port of the wavelength division multiplexer, the pump light is output to one end of the polarization-maintaining fiber Bragg grating through a common port of the wavelength division multiplexer, the pump light is output to the Er-doped gain fiber through the other end of the polarization-maintaining fiber Bragg grating, and oscillation laser passing through the gain fiber is input to a right lower straight waveguide port of the waveguide resonance ring; based on the transconductance coupling coefficients of the lower straight waveguide and the ring waveguide, part of input oscillation laser enters a left half ring of the ring waveguide through a coupling region of the ring waveguide and the lower straight waveguide, the rest is output from a left port of the lower straight waveguide, when the light wave entering the left half ring passes through the coupling region of the ring waveguide and the upper straight waveguide, part of the light enters the upper straight waveguide through the coupling region and is output through a right port of the upper straight waveguide, the rest of the light enters the coupling region of the ring waveguide and the lower straight waveguide through a right half ring, based on the transconductance coupling coefficients of the upper straight waveguide and the ring waveguide, in the coupling region, the light frequency with the phase delay of 2 pi integral multiple is transmitted along the left half ring of the waveguide, the rest of the light enters the left half ring through the coupling region based on the transconductance coupling coefficients of the lower straight waveguide and the ring waveguide, and the rest of the light is output through;
the light wave output from the right port of the upper straight waveguide is reflected by the high-reflection fiber Bragg grating to set the wavelength of the light wave, then enters the coupling area of the upper straight waveguide and the ring waveguide, part of the light enters the left half ring of the ring waveguide based on the transconductance coupling coefficient of the upper straight waveguide and the ring waveguide, and the rest light is output from the left port of the upper straight waveguide; when light entering the left half ring of the ring waveguide reaches the coupling region of the ring waveguide and the lower straight waveguide, based on the transconductance coupling coefficients of the lower straight waveguide and the ring waveguide, part of the light is output from the right port of the lower straight waveguide, and the rest light enters the right half ring of the ring waveguide through the Er-doped gain fiber; the light wave entering the Er-doped gain fiber is input into the common end of the wavelength division multiplexer through the polarization maintaining fiber Bragg grating, and then is input into the optical isolator through the signal end of the wavelength division multiplexer, and the optical isolator outputs stable single-frequency laser; when the light wave entering the right half ring of the ring waveguide reaches the coupling area of the upper straight waveguide and the ring waveguide, the light frequency with the phase delay of 2 pi integral multiple enters the left half ring, the rest light enters the left half ring through the coupling area based on the transconductance coupling coefficient of the upper straight waveguide and the ring waveguide, and the rest light is output through the left port of the upper straight waveguide.
2. The single-frequency fiber laser of claim 1, wherein the waveguide resonant ring comprises an upper straight waveguide, a lower straight waveguide, and a ring waveguide disposed between the upper straight waveguide and the lower straight waveguide, and the coupling coefficient between the upper straight waveguide and the ring waveguide is equal to the coupling coefficient between the lower straight waveguide and the ring waveguide.
3. The single-frequency fiber laser of claim 2, wherein the transconductance coupling coefficient between the upper straight waveguide and the ring waveguide is 50%, and the transconductance coupling coefficient between the lower straight waveguide and the ring waveguide is 50%.
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| CN116045954B (en) * | 2023-03-31 | 2023-06-09 | 中国船舶集团有限公司第七〇七研究所 | Hybrid resonant cavity for optical gyro and optical gyro |
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| CN102170082A (en) * | 2011-03-29 | 2011-08-31 | 东南大学 | All-fiber pulsed fiber laser with composite chamber |
| CN104937791A (en) * | 2013-01-28 | 2015-09-23 | 富士通株式会社 | Laser device, optical modulation device, and optical semiconductor element |
| CN103178434A (en) * | 2013-03-04 | 2013-06-26 | 华南理工大学 | Wavelength-tunable miniature single-mode optical fiber laser |
| CN103414093A (en) * | 2013-04-28 | 2013-11-27 | 北京工业大学 | All-fiber pulsed laser |
| CN105790059A (en) * | 2014-12-23 | 2016-07-20 | 山东海富光子科技股份有限公司 | Mode-hop free continuous single-frequency fiber laser |
| CN105261921A (en) * | 2015-11-18 | 2016-01-20 | 北京工业大学 | Short resonant cavity all-fiber narrow line-width single frequency laser |
| CN105514774A (en) * | 2016-01-26 | 2016-04-20 | 中国人民解放军国防科学技术大学 | Two-micron-waveband low-threshold-value thulium-doped optical filer laser device for joint pumping of fiber core and cladding |
| CN106207723A (en) * | 2016-08-28 | 2016-12-07 | 北京工业大学 | A kind of all-fiber pulse laser of multi-resonant chamber coupling |
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