CN117954951A - Self-injection locking distributed feedback single-frequency optical fiber laser - Google Patents
Self-injection locking distributed feedback single-frequency optical fiber laser Download PDFInfo
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10084—Frequency control by seeding
- H01S3/10092—Coherent seed, e.g. injection locking
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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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Abstract
The invention discloses a self-injection locking distributed feedback single-frequency fiber laser, which comprises a pumping source, a pumping protector, a wavelength division multiplexer, a phase shift fiber grating, a gain fiber and an external resonant cavity, wherein the pumping source is connected with the pumping end of the wavelength division multiplexer through the pumping protector, the phase shift fiber grating is inscribed on the gain fiber to form a linear resonant cavity, the idle end of the linear resonant cavity is connected with the external resonant cavity, the external resonant cavity injects laser signals at the idle end of the linear resonant cavity into the linear resonant cavity to form a self-injection locking structure, the public end of the wavelength division multiplexer is connected with the output end of the linear resonant cavity, and the signal end of the wavelength division multiplexer is used as the output end of the distributed feedback single-frequency fiber laser. The invention effectively utilizes the laser of the idle end of the linear resonant cavity to perform self-injection locking, suppresses the intensity noise and the frequency noise of the laser signal of the output end, and realizes line width narrowing and efficiency improvement.
Description
Technical Field
The invention relates to the field of single-frequency fiber lasers, in particular to a self-injection locking distributed feedback single-frequency fiber laser.
Background
The single-frequency fiber laser has the advantages of narrow line width, low noise and good coherence, thereby having wide application in the fields of coherent optical communication, laser radar, interference type fiber sensing, high-precision spectroscopy, metrology and the like. The single-frequency fiber laser can be divided into a ring cavity and a linear cavity according to the structure and the working principle of a resonant cavity in the single-frequency fiber laser, wherein the cavity length of the ring cavity is generally longer, the structure is complex, the loss is large, an effective frequency discrimination mechanism is lacked, a mode jump is easy to occur, and a specific longitudinal mode is difficult to stably work for a long time. The linear cavity can be divided into distributed Bragg reflection (Distributed Bragg reflector, DBR), distributed feedback (Distributed feedback, DFB). Compared with the prior art, the linear cavity can form single-frequency laser output by directly writing the Bragg grating into the fiber core as a cavity mirror, and has the advantages of simple structure, high efficiency, difficult occurrence of mode hopping and stable operation. The DBR laser consists of a high-doped gain optical fiber and an optical fiber grating, and the characteristics of the output linewidth and the like are determined by cavity length, grating reflection spectrum, doped optical fiber and the like; and the DFB fiber laser directly writes the phase shift fiber grating into the gain fiber, so that the loss and structural instability caused by fiber fusion are avoided. Meanwhile, the DFB fiber laser can realize feedback and wavelength selection by only using one phase shift grating, and the structure is adopted to obtain single longitudinal mode output more easily. According to the application requirements of the current related field on low-noise single-frequency fiber lasers, the light source still needs to be further optimized to obtain single-frequency lasers with higher performance.
To date, researchers have developed a variety of techniques to suppress noise of single frequency lasers. The common noise reduction methods include photoelectric feedback and optical feedback, wherein the latter has the advantages of wide noise suppression bandwidth, no electronic servo system, capability of simultaneously suppressing laser intensity and frequency noise, and the like, and becomes a research hot spot in recent years. At present, optical feedback based on self injection locking generally utilizes a coupler to separate part of signal light at the output end of a single-frequency fiber laser and injects the part of signal light back into an oscillation cavity, and the effects of noise suppression and line width compression are achieved through a coherent optical feedback mode. However, this method has the disadvantage of feeding back the laser output, requiring the introduction of additional couplers, circulators, etc., which results in a relatively complex system structure and a somewhat reduced efficiency of the laser.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a self-injection locking distributed feedback single-frequency optical fiber laser with simpler and more compact structure, noise suppression and high efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
The utility model provides a from injection locking distributing type feedback single frequency fiber laser, includes pump source, pump protector, wavelength division multiplexer, phase shift fiber grating, gain optic fibre, the pump source passes through the pump protector and is connected with the pumping end of wavelength division multiplexer, phase shift fiber grating inscribes on gain optic fibre and constitutes the line type resonant cavity, still includes the outside resonant cavity, the idle end and the outside resonant cavity of line type resonant cavity are connected, the outside resonant cavity annotates the laser signal of the idle end of line type resonant cavity back line type resonant cavity and constitutes from injection locking structure, wavelength division multiplexer public end and the output of line type resonant cavity are connected, the signal end of wavelength division multiplexer is as the output of distributing type feedback single frequency fiber laser.
As a further improvement of the above technical scheme:
The external resonant cavity comprises a feedback optical fiber and an optical fiber Bragg grating, one end of the feedback optical fiber is connected with the optical fiber Bragg grating in series, and the other end of the feedback optical fiber is connected with the idle end of the linear resonant cavity.
The external resonant cavity comprises a feedback optical fiber and an optical fiber circulator, one end of the feedback optical fiber is connected with the optical fiber circulator in series, and the other end of the feedback optical fiber is connected with the idle end of the linear resonant cavity.
The external resonant cavity comprises a feedback optical fiber, an optical fiber coupler and an isolator which are sequentially connected in series, and one end of the feedback optical fiber is connected with the idle end of the linear resonant cavity.
The external resonant cavity comprises a feedback optical fiber and an optical fiber reflector, one end of the feedback optical fiber is connected with the optical fiber reflector in series, and the other end of the feedback optical fiber is connected with the idle end of the linear resonant cavity.
The pump source is a semiconductor laser or a fiber laser.
The gain optical fiber is an active optical fiber or a passive optical fiber.
When the gain optical fiber is a passive optical fiber, the gain optical fiber type is a Raman gain optical fiber, and the matrix material of the Raman gain optical fiber is one or more of quartz, phosphate, silicate, tellurate, fluoride or sulfide.
When the gain optical fiber is an active optical fiber, the gain optical fiber is doped with rare earth ions, and the rare earth ions are one or more of Yb3+、Er3+、Tm3+、Nd3+、Ge3+、Pr3+、Ho3+、Eu3+、Dy3+.
The working wavelength ranges of the fiber Bragg grating, the fiber circulator, the fiber coupler and the fiber reflector cover the working wavelength range of the phase shift fiber grating.
The working wavelength range of the wavelength division multiplexer covers the working wavelength range of a pump source, a phase shift fiber grating, a fiber Bragg grating, a fiber circulator, a fiber coupler and a fiber reflector.
The central reflection wavelength of the fiber Bragg grating covers the laser output wavelength, the reflection spectrum width of 3 dB is smaller than 2 nm, and the reflectivity of the central wavelength is 4% -99.5%.
The operating band laser of the fiber optic circulator includes a laser output wavelength.
The working wave band of the optical fiber coupler covers the laser output wavelength, and the coupling ratio is 1:99-50:50.
The central reflection wavelength of the optical fiber reflector covers the laser output wavelength, and the reflectivity of the central wavelength is 4% -99.8%.
The self-injection locked distributed feedback single-frequency fiber laser outputs linearly polarized light or non-linearly polarized light.
The feedback optical fiber is replaceable gain optical fiber with different lengths.
Compared with the prior art, the invention has the beneficial effects that:
The invention relates to a self-injection locking distributed feedback single-frequency fiber laser, which is characterized in that according to the structural characteristics of the distributed feedback single-frequency fiber laser, the position of a phase shift point on a phase shift fiber grating determines the main output end of a resonant cavity, and small part of laser signals are output at the idle end of the phase shift fiber grating.
Drawings
Fig. 1 is a schematic structural diagram of a self-injection locked distributed feedback single frequency fiber laser according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a self-injection locked distributed feedback single frequency fiber laser according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a self-injection locked distributed feedback single frequency fiber laser according to embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of a self-injection locked distributed feedback single frequency fiber laser according to embodiment 4 of the present invention.
Fig. 5 shows the results of the noise test of the laser intensity before and after the self-injection locked distributed feedback single frequency fiber laser of the present embodiment 1 is added to the external resonator 7 (fiber bragg grating 8).
Legend description: 1. a pump source; 2. a pump protector; 3. a wavelength division multiplexer; 4. a phase shift fiber grating; 5. a gain fiber; 6. a feedback optical fiber; 7. an external resonant cavity; 8. a fiber bragg grating; 9. an optical fiber circulator; 10. an optical fiber coupler; 11. an isolator; 12. and a fiber optic mirror.
Detailed Description
The invention will be further described with reference to the drawings and examples, it being understood that the scope of the invention as claimed is not limited to the examples.
Example 1:
As shown in fig. 1, the self-injection locked distributed feedback single-frequency fiber laser of this embodiment includes a pump source 1, a pump protector 2, a wavelength division multiplexer 3, a phase shift fiber grating 4, a gain fiber 5, and an external resonant cavity 7, where the pump source 1 is connected with the pump protector 2, the pump protector 2 is connected with a pump end of the wavelength division multiplexer 3, the phase shift fiber grating 4 is inscribed on the gain fiber 5 to form a linear resonant cavity, the external resonant cavity 7 includes a feedback fiber 6 and a fiber bragg grating 8 sequentially connected in sequence, a common end of the wavelength division multiplexer 3 is connected with an output end of the phase shift fiber grating 4 (i.e., the linear resonant cavity), an idle end of the phase shift fiber grating 4 (i.e., the linear resonant cavity) is connected with the fiber bragg grating 8 through the feedback fiber 6 of the external resonant cavity 7, and a signal end of the wavelength division multiplexer 3 is used as an output end of the distributed feedback single-frequency fiber laser. The external resonant cavity of the embodiment adopts a fiber bragg grating feedback scheme, the fiber bragg grating 8 feeds back forward output light at the idle end of the phase-shift fiber bragg grating 4, the pumping mode is backward pumping, the gain fiber 5 is used as a gain medium of a laser, and the phase-shift fiber bragg grating 4 inscribed on the gain fiber 5 is used as a linear resonant cavity. The pump source 1 pumps the linear resonator backward through the wavelength division multiplexer 3.
The pump source 1 of this embodiment is a semiconductor laser or a fiber laser.
The 3 dB reflection spectrum width of the fiber Bragg grating 5 is smaller than 2 nm, and the central wavelength reflectivity is 4% -99.5%.
In this embodiment, the gain fiber 5 is a rare earth doped gain fiber, and the luminescent ions are one or more of lanthanide ions and transition metal ions, and are uniformly doped in the fiber core.
In some embodiments, the gain fiber 5 is a passive fiber, a raman gain fiber made of the matrix material quartz, phosphate, silicate, tellurate, fluoride, sulfide, or the like.
In this embodiment, the fiber bragg grating 8 is connected with the idle end of the phase shift fiber bragg grating 4 to form a self-injection locking structure, so as to realize feedback of forward output laser and inject the forward output laser back into the linear resonant cavity, the laser after feedback is output backward through the signal end of the wavelength division multiplexer 3, so as to obtain low-noise narrow-linewidth single-frequency laser, and the feedback fiber 6 is set as a gain fiber, so as to realize absorption of residual pump light.
The self-injection locking distributed feedback single-frequency fiber laser can change the length of the feedback fiber 6 between the phase-shift fiber bragg grating 4 and the fiber bragg grating 8 and the reflectivity of the fiber bragg grating 8 according to the requirements, and enlarge the noise suppression range and degree.
The specific application method of the self-injection locking distributed feedback single-frequency fiber laser comprises the following steps:
The first step: and selecting a proper pumping source 1 and a proper gain fiber 5 according to the required single-frequency laser performance index with low noise and narrow linewidth.
And a second step of: according to the expected central wavelength of the obtained single-frequency laser, selecting a phase-shift fiber bragg grating 4 with the central wavelength being the required single-frequency laser wavelength, and selecting a fiber bragg grating 8 with the working wavelength covering the phase-shift fiber bragg grating 4; the phase shift fiber grating 4 is engraved on the gain fiber 5; the bandwidth is chosen to cover the pump source 1 and the fiber bragg grating 8 of the phase-shifted fiber bragg grating 4 and wavelength division multiplexer 3.
The optical fiber bragg grating 8 of which the operating wavelength covers the phase-shift optical fiber grating 4 is selected such that the laser passing through the phase-shift optical fiber grating 4 can be fed back by the optical fiber bragg grating 8, and the optical fiber bragg grating 8 has wavelength selectivity and can reflect only the laser of a specific wavelength.
And a third step of: the structure according to the embodiment of the invention connects the devices:
Example structure (as shown in fig. 1): the pumping end of the wavelength division multiplexer 3 is connected with a pumping source 1 through a pumping protector 2; the public end of the wavelength division multiplexer 3 is connected with the output end of the phase shift fiber grating 4, and the idle end of the phase shift fiber grating 4 is connected with the fiber Bragg grating 8 of the external resonant cavity 7; the signal end of the wavelength division multiplexer 3 serves as an output port of the fiber laser.
Fourth step: the pump source 1 is started, and the fiber laser realizes single-frequency laser output with low noise and narrow linewidth.
The intensity noise test was performed on the output laser light of the fiber laser of this embodiment. In the specific implementation process, a 976nm semiconductor laser is adopted as a pumping source 1, an ytterbium-doped phosphate grating is adopted as a gain fiber 5, a phase shift fiber grating with the length of 5cm, the phase shift quantity of pi and the output wavelength of 1064nm is adopted as a phase shift fiber grating 4, the output end of a wavelength division multiplexer 3 is connected into a noise analyzer through an attenuator, and the noise analyzer is used for testing and outputting laser intensity noise.
Firstly, when the output current of the pump source 1 is 200mA and the laser is not connected with the external resonant cavity 7 (not connected with the fiber Bragg grating 8), the output laser intensity noise is tested, and the test result is shown in the curve of FIG. 5, and the laser intensity noise is about-125 dB/Hz in the range of 500Hz-2 MHz. Then, when the output current of the pump source 1 is 200mA and the laser is connected with the external resonant cavity 7 (connected with the fiber Bragg grating 8), the output laser intensity noise is tested, and the test result is shown in the lower curve of fig. 5. According to the test result diagrams of the two conditions of unaccessed and accessed fiber Bragg gratings 8 in fig. 5, it can be seen that after the self-injection locking is realized by introducing an external resonant cavity 7 (fiber Bragg grating 8), the laser intensity noise is reduced by about 10-15 dB/Hz within the range of 500Hz-2MHz, the output laser intensity noise is suppressed in the middle-low frequency band, and the feasibility of realizing the noise suppression by the self-injection locking is proved.
Example 2:
As shown in fig. 1, the self-injection locked distributed feedback single-frequency fiber laser of this embodiment includes a pump source 1, a pump protector 2, a wavelength division multiplexer 3, a phase shift fiber grating 4, a gain fiber 5, and an external resonant cavity 7, where the pump source 1 is connected with the pump protector 2, the pump protector 2 is connected with a pump end of the wavelength division multiplexer 3, the phase shift fiber grating 4 is inscribed on the gain fiber 5 to form a linear resonant cavity, the external resonant cavity 7 includes a feedback fiber 6 and a fiber circulator 9 sequentially connected in sequence, a common end of the wavelength division multiplexer 3 is connected with an output end of the phase shift fiber grating 4 (i.e., the linear resonant cavity), an idle end of the phase shift fiber grating 4 (i.e., the linear resonant cavity) is connected with the fiber circulator 9 through the feedback fiber 6 of the external resonant cavity 7 to form a self-injection locking device, and a signal end of the wavelength division multiplexer 3 is used as an output end of the distributed feedback single-frequency fiber laser. The external resonant cavity of the embodiment adopts a circulator feedback scheme, the fiber circulator 9 feeds back forward output light at the idle end of the phase-shift fiber grating 4, the pumping mode is backward pumping, the gain fiber 5 is used as a gain medium of a laser, and the phase-shift fiber grating 4 inscribed on the gain fiber 5 is used as a linear resonant cavity. The pump source 1 pumps the linear resonator backward through the wavelength division multiplexer 3.
The pump source 1 of this embodiment is a semiconductor laser or a fiber laser.
In this embodiment, the gain fiber 5 is a rare earth doped gain fiber, and the luminescent ions are one or more of lanthanide ions and transition metal ions, and are uniformly doped in the fiber core.
In some embodiments, the gain fiber 5 is a passive fiber, a raman gain fiber made of the matrix material quartz, phosphate, silicate, tellurate, fluoride, sulfide, or the like.
In this embodiment, the optical fiber circulator 9 is connected with the idle end of the phase shift fiber bragg grating 4 to form a self-injection locking structure, so as to realize feedback of forward output laser and inject the forward output laser back into the linear resonant cavity, the laser after feedback is output backward through the signal end of the wavelength division multiplexer 3, so as to obtain low-noise narrow-linewidth single-frequency laser, and the feedback fiber 6 is set as a gain fiber, so as to realize absorption of residual pump light.
The self-injection locking distributed feedback single-frequency optical fiber laser can change the length of the feedback optical fiber 6 between the phase-shift optical fiber grating 4 and the optical fiber circulator 9 according to the requirement, and enlarge the range and degree of noise suppression.
The specific application method of the self-injection locking distributed feedback single-frequency fiber laser comprises the following steps:
The first step: and selecting a proper pumping source 1 and a proper gain fiber 5 according to the required single-frequency laser performance index with low noise and narrow linewidth.
And a second step of: according to the expected central wavelength of the obtained single-frequency laser, selecting a phase-shift fiber bragg grating 4 with the central wavelength being the required single-frequency laser wavelength, and selecting a fiber circulator 9 with the working wavelength covering the phase-shift fiber bragg grating 4; the phase shift fiber grating 4 is engraved on the gain fiber 5; the bandwidth is selected to cover the pump source 1 and the fiber circulator 9 of the phase-shifted fiber grating 4 and wavelength division multiplexer 3.
And a third step of: the structure according to the embodiment of the invention connects the devices:
Example structure (as shown in fig. 1): the pumping end of the wavelength division multiplexer 3 is connected with a pumping source 1 through a pumping protector 2; the public end of the wavelength division multiplexer 3 is connected with the output end of the phase shift fiber grating 4, and the idle end of the phase shift fiber grating 4 is connected with the feedback fiber 6 and the fiber circulator 9 of the external resonant cavity 7; the signal end of the wavelength division multiplexer 3 serves as an output port of the fiber laser.
Fourth step: the pump source 1 is started, and the fiber laser realizes single-frequency laser output with low noise and narrow linewidth.
Example 3:
As shown in fig. 1, the self-injection locked distributed feedback single-frequency fiber laser of this embodiment includes a pump source 1, a pump protector 2, a wavelength division multiplexer 3, a phase shift fiber grating 4, a gain fiber 5, and an external resonant cavity 7, where the pump source 1 is connected with the pump protector 2, the pump protector 2 is connected with a pump end of the wavelength division multiplexer 3, the phase shift fiber grating 4 is inscribed on the gain fiber 5 to form a linear resonant cavity, the external resonant cavity 7 includes a feedback fiber 6, a fiber coupler 10, and an isolator 11 sequentially connected in series, a public end of the wavelength division multiplexer 3 is connected with an output end of the phase shift fiber grating 4 (i.e., the linear resonant cavity), an idle end of the phase shift fiber grating 4 (i.e., the linear resonant cavity) is connected with a fiber coupler 10 through a feedback fiber 6 of the external resonant cavity 7 to form a self-injection locking device, and a signal end of the wavelength division multiplexer 3 is used as an output end of the distributed feedback single-frequency fiber laser. The external resonant cavity 7 in this embodiment adopts a sagnac loop feedback scheme, the fiber coupler 10 feeds back the forward output light at the idle end of the phase-shift fiber grating 4, the pumping mode is backward pumping, the gain fiber 5 is used as the gain medium of the laser, and the phase-shift fiber grating 4 inscribed on the gain fiber 5 is used as the linear resonant cavity. The pump source 1 pumps the linear resonator backward through the wavelength division multiplexer 3.
The pump source 1 of this embodiment is a semiconductor laser or a fiber laser.
The spectral ratio of the fiber coupler 10 ranges from 1:99 to 50:50.
In this embodiment, the gain fiber 5 is a rare earth doped gain fiber, and the luminescent ions are one or more of lanthanide ions and transition metal ions, and are uniformly doped in the fiber core.
In some embodiments, the gain fiber 5 is a passive fiber, a raman gain fiber made of the matrix material quartz, phosphate, silicate, tellurate, fluoride, sulfide, or the like.
In this embodiment, the optical fiber coupler 10 is connected with the idle end of the phase shift fiber grating 4 to form a self-injection locking structure, so as to realize feedback of forward output laser and inject the forward output laser back into the linear resonant cavity, the laser after feedback is output backward through the signal end of the wavelength division multiplexer 3, so as to obtain low-noise narrow-linewidth single-frequency laser, and the feedback fiber 6 is set as a gain fiber, so as to realize absorption of residual pump light.
The self-injection locking distributed feedback single-frequency fiber laser can change the length of the feedback fiber 6 between the phase-shift fiber grating 4 and the fiber coupler 10 according to the requirement, and enlarge the noise suppression range and degree.
The specific application method of the self-injection locking distributed feedback single-frequency fiber laser comprises the following steps:
The first step: and selecting a proper pumping source 1 and a proper gain fiber 5 according to the required single-frequency laser performance index with low noise and narrow linewidth.
And a second step of: according to the expected central wavelength of the obtained single-frequency laser, selecting a phase-shift fiber grating 4 with the central wavelength being the required single-frequency laser wavelength, and selecting a fiber coupler 10 with the working wavelength covering the phase-shift fiber grating 4; the phase shift fiber grating 4 is engraved on the gain fiber 5; the bandwidth is chosen to cover the pump source 1 and the fiber coupler 10 of the phase-shifted fiber grating 4 and wavelength division multiplexer 3.
And a third step of: the structure according to the embodiment of the invention connects the devices:
Example structure (as shown in fig. 1): the pumping end of the wavelength division multiplexer 3 is connected with a pumping source 1 through a pumping protector 2; the public end of the wavelength division multiplexer 3 is connected with the output end of the phase shift fiber grating 4, the idle end of the phase shift fiber grating 4 is connected with the fiber coupler 10, and the fiber loop after the fiber coupler 10 is inserted into the isolator 11 to ensure unidirectional laser transmission; the signal end of the wavelength division multiplexer 3 serves as an output port of the fiber laser.
Fourth step: the pump source 1 is started, and the fiber laser realizes single-frequency laser output with low noise and narrow linewidth.
Example 4:
As shown in fig. 1, the self-injection locked distributed feedback single-frequency fiber laser of this embodiment includes a pump source 1, a pump protector 2, a wavelength division multiplexer 3, a phase shift fiber grating 4, a gain fiber 5, and an external resonant cavity 7, where the semiconductor pump source 1 is connected with the pump protector 2, the pump protector 2 is connected with a pump end of the wavelength division multiplexer 3, the phase shift fiber grating 4 is inscribed on the gain fiber 5 to form a linear resonant cavity, the external resonant cavity 7 includes a feedback fiber 6 and a fiber mirror 12 sequentially connected in sequence, a common end of the wavelength division multiplexer 3 is connected with an output end of the phase shift fiber grating 4 (i.e., the linear resonant cavity), an idle end of the phase shift fiber grating 4 (i.e., the linear resonant cavity) is connected with the fiber mirror 12 through the feedback fiber 6 of the external resonant cavity 7 to form a self-injection locking device, and a signal end of the wavelength division multiplexer 3 is used as an output end of the distributed feedback single-frequency fiber laser.
The external resonant cavity 7 in this embodiment adopts a feedback scheme of an optical fiber reflector, the optical fiber reflector 12 feeds back the forward output light at the idle end of the phase-shift fiber grating 4, the pumping mode is backward pumping, the gain fiber 5 is used as a gain medium of a laser, and the phase-shift fiber grating 4 inscribed on the gain fiber 5 is used as a linear resonant cavity. The pump source 1 pumps the linear resonator backward through the wavelength division multiplexer 3.
The pump source 1 of this embodiment is a semiconductor laser or a fiber laser.
The reflectivity of the fiber optic mirror 12 is 4% -99.8%.
In this embodiment, the gain fiber 5 is a rare earth doped gain fiber, and the luminescent ions are one or more of lanthanide ions and transition metal ions, and are uniformly doped in the fiber core.
In some embodiments, the gain fiber 5 is a passive fiber, a raman gain fiber made of the matrix material quartz, phosphate, silicate, tellurate, fluoride, sulfide, or the like.
In this embodiment, the optical fiber reflector 12 is connected with the idle end of the phase shift fiber grating 4 to form a self-injection locking structure, so as to realize feedback of forward output laser and inject the forward output laser back into the linear resonant cavity, the laser after feedback is output backward through the signal end of the wavelength division multiplexer 3, so as to obtain low-noise narrow-linewidth single-frequency laser, and the feedback fiber 6 is set as a gain fiber, so as to realize absorption of residual pump light.
The self-injection locking distributed feedback single-frequency fiber laser can change the length of the feedback fiber 6 between the phase-shift fiber grating 4 and the fiber reflector 12 according to the requirement, and enlarge the noise suppression range and degree.
The specific application method of the self-injection locking distributed feedback single-frequency fiber laser comprises the following steps:
The first step: and selecting a proper pumping source 1 and a proper gain fiber 5 according to the required single-frequency laser performance index with low noise and narrow linewidth.
And a second step of: according to the expected central wavelength of the obtained single-frequency laser, selecting a phase-shift fiber grating 4 with the central wavelength being the required single-frequency laser wavelength, and selecting a fiber reflector 12 with the working wavelength covering the phase-shift fiber grating 4; the phase shift fiber grating 4 is engraved on the gain fiber 5; the bandwidth is chosen to cover the pump source 1 and the fiber mirror 12 of the phase-shifted fiber grating 4 and wavelength division multiplexer 3.
And a third step of: the structure according to the embodiment of the invention connects the devices:
example structure (as shown in fig. 1): the pumping end of the wavelength division multiplexer 3 is connected with a pumping source 1 through a pumping protector 2; the public end of the wavelength division multiplexer 3 is connected with the output end of the phase shift fiber grating 4, and the idle end of the phase shift fiber grating 4 is connected with the fiber mirror 12; the signal end of the wavelength division multiplexer 3 serves as an output port of the fiber laser.
Fourth step: the pump source 1 is started, and the fiber laser realizes single-frequency laser output with low noise and narrow linewidth.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a from injection locking distributing type feedback single frequency fiber laser, includes pump source (1), pump protector (2), wavelength division multiplexer (3), phase shift fiber grating (4), gain optic fibre (5), pump source (1) are connected with the pumping end of wavelength division multiplexer (3) through pump protector (2), phase shift fiber grating (4) inscribe constitutes the line type resonant cavity on gain optic fibre (5), characterized in that, still include outside resonant cavity (7), the idle end and the outside resonant cavity (7) of line type resonant cavity are connected, outside resonant cavity (7) are with the laser signal injection linear resonant cavity constitution from injection locking structure of the idle end of line type resonant cavity, the common end of wavelength division multiplexer (3) is connected with the output of line type resonant cavity, the signal end of wavelength division multiplexer (3) is as the output of distributing type feedback single frequency fiber laser.
2. The self-injection locking distributed feedback single frequency fiber laser according to claim 1, characterized in that the external resonator (7) comprises a feedback fiber (6), a fiber bragg grating (8), one end of the feedback fiber (6) is connected in series with the fiber bragg grating (8), the other end is connected with the idle end of the linear resonator.
3. The self-injection locking distributed feedback single frequency fiber laser according to claim 1, characterized in that the external resonator (7) comprises a feedback fiber (6), a fiber circulator (9), one end of the feedback fiber (6) is connected in series with the fiber circulator (9), and the other end is connected with the idle end of the linear resonator.
4. The self-injection locking distributed feedback single frequency fiber laser according to claim 1, wherein the external resonant cavity (7) comprises a feedback fiber (6), a fiber coupler (10) and an isolator (11) which are sequentially connected in series, and one end of the feedback fiber (6) is connected with the idle end of the linear resonant cavity.
5. The self-injection locking distributed feedback single frequency fiber laser according to claim 1, characterized in that the external resonator (7) comprises a feedback fiber (6), a fiber mirror (12), one end of the feedback fiber (6) is connected in series with the fiber mirror (12), and the other end is connected with the idle end of the linear resonator.
6. Self-injection locked distributed feedback single frequency fiber laser according to any of claims 1 to 5, characterized in that the pump source (1) is a semiconductor laser or a fiber laser.
7. Self-injection locked distributed feedback single frequency fiber laser according to any of claims 1 to 5, characterized in that the gain fiber (5) is an active fiber or a passive fiber.
8. A self-injection locking distributed feedback single frequency fiber laser according to claim 7, characterized in that when the gain fiber (5) is a passive fiber, the gain fiber type is a raman gain fiber, the matrix material of which is one or more of quartz, phosphate, silicate, tellurate, fluoride or sulfide.
9. The self-injection locking distributed feedback single frequency fiber laser of claim 7, wherein when the gain fiber (5) is an active fiber, the gain fiber type is a rare earth ion doped gain fiber, the rare earth ions being one or more of Yb3+、Er3+、Tm3+、Nd3+、Ge3+、Pr3+、Ho3+、Eu3+、Dy3+.
10. The self-injection locked distributed feedback single frequency fiber laser of any of claims 1-5, wherein the operating wavelength range of the fiber bragg grating (8), fiber circulator (9), fiber coupler (10), fiber mirror (12) covers the operating wavelength range of the phase shifted fiber grating (4);
The working wavelength range of the wavelength division multiplexer (3) covers the working wavelength ranges of the pump source (1), the phase shift fiber grating (4), the fiber Bragg grating (8), the fiber circulator (9), the fiber coupler (10) and the fiber reflector (12).
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