CN108711727B - Polarization maintaining distributed feedback fiber laser and manufacturing method thereof - Google Patents
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Abstract
The invention relates to a polarization maintaining distributed feedback fiber laser and a manufacturing method thereof, belonging to the technical field of fiber lasers. The laser includes: the device comprises a pumping source, a phase-shift fiber grating, a polarization-maintaining wavelength division multiplexer and a polarization-maintaining isolator. The front end of the phase-shift fiber grating is a single-mode fiber, and the rear end of the phase-shift fiber grating is a polarization maintaining fiber. And pumping light generated by the pumping source is transmitted to the phase-shift fiber grating through the single-mode fiber and is output to the polarization-maintaining wavelength division multiplexer through the polarization-maintaining fiber, output line polarization narrow linewidth laser and residual pumping light are output, and the linear polarization narrow linewidth laser forms polarization-maintaining narrow linewidth laser output through the polarization-maintaining isolator. The laser adopts a distributed feedback structure, so that the structure is simpler, the output characteristic of a single longitudinal mode is more stable, and the relative intensity noise and the phase noise of the laser are lower; and secondly, the polarization-maintaining laser is output in a polarization-maintaining mode, and the laser has a linear polarization maintaining characteristic, so that the application requirement of a sensing system with a polarization-maintaining requirement is met, and the selectivity is more flexible when people select the laser.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a polarization maintaining distributed feedback fiber laser and a manufacturing method thereof.
Background
The narrow-linewidth optical fiber laser has important application value in many fields such as distributed optical fiber sensors, optical fiber hydrophones, laser radars and the like. Meanwhile, in an interference type optical fiber sensor based on optical coherence detection, such as an optical fiber gyroscope, an optical fiber hydrophone and the like, besides the requirement that a light source has a narrow linewidth characteristic, the light source is also required to have the performance that the polarization direction is stable and unchanged, so that the signal-to-noise ratio of an interference signal is improved, and the high-precision measurement of a physical quantity is realized. At present, a distributed Bragg reflection short cavity (DBR) and ring cavity structure narrow linewidth fiber laser is easy to realize polarization-maintaining laser output by selecting a polarization-maintaining fiber device to form a polarization-maintaining light path, and a distributed feedback structure fiber laser with lower noise and more stable mode operation is difficult to realize the polarization-maintaining laser output because excellent phase-shifting fiber gratings are difficult to manufacture on a polarization-maintaining gain fiber.
Disclosure of Invention
Accordingly, the present invention is directed to a polarization maintaining dfb fiber laser and a method for fabricating the same, which effectively solve the above-mentioned problems.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a polarization maintaining distributed feedback fiber laser, including: the device comprises a pumping source, a phase-shift fiber grating, a polarization-maintaining wavelength division multiplexer and a polarization-maintaining isolator. The front end of the phase-shift fiber grating is a single-mode fiber, and the rear end of the phase-shift fiber grating is a polarization maintaining fiber. And the pump light generated by the pump source is transmitted to the phase-shift fiber grating through the single-mode fiber, and mixed light comprising the linearly polarized narrow linewidth laser and residual pump light is output. The mixed light is output to the polarization maintaining wavelength division multiplexer through the polarization maintaining optical fiber, the linearly polarized narrow linewidth laser is output to the polarization maintaining isolator through a signal end of the polarization maintaining wavelength division multiplexer to form polarization maintaining narrow linewidth laser output, and the residual pump light is output through a pump end of the polarization maintaining wavelength division multiplexer.
In an alternative embodiment of the invention, the pump source is a pump source that generates 980nm or 1480nm wavelength pump light.
In an alternative embodiment of the present invention, the phase-shifted fiber grating is an erbium-doped phase-shifted fiber grating.
In alternative embodiments of the present invention, the polarization maintaining fiber is a PM980 fiber or a PM1550 fiber.
In an alternative embodiment of the present invention, the polarization maintaining wavelength division multiplexer is an 980/1550 polarization maintaining wavelength division multiplexer or a 1480/1550 polarization maintaining wavelength division multiplexer.
In a second aspect, an embodiment of the present invention further provides a method for manufacturing a polarization maintaining distributed feedback fiber laser, including: cutting off the single mode fiber at the rear end of the phase-shift fiber grating; and welding a polarization maintaining fiber at one end of the phase-shifting fiber grating from which the single-mode fiber is cut.
With reference to the first embodiment of the second aspect, a polarization maintaining fiber is fusion spliced at one end of the phase shift fiber grating from which a single mode fiber is cut, and the fusion splicing method includes: respectively clamping the phase-shift fiber grating and the polarization maintaining fiber by utilizing a polarization maintaining fusion splicer; aligning the phase-shifted fiber grating with the polarization maintaining fiber by rotating the phase-shifted fiber grating or the polarization maintaining fiber; after the phase-shift fiber grating is aligned with the polarization maintaining fiber, the polarization maintaining fusion splicer discharges to fuse the polarization maintaining fiber to one end of the phase-shift fiber grating from which the single-mode fiber is cut.
In combination with the second embodiment of the second aspect, the aligning the phase-shifted fiber grating with the polarization maintaining fiber by rotating the phase-shifted fiber grating or the polarization maintaining fiber comprises: starting a pumping source connected to the front end of the phase-shift fiber bragg grating so as to enable the output line of the phase-shift fiber bragg grating to output line polarization narrow linewidth laser; adjusting the reading of a power meter connected with a pumping end of a polarization maintaining wavelength division multiplexer connected with the rear end of the polarization maintaining fiber by rotating the phase shift fiber grating or the polarization maintaining fiber, and adjusting the reading of an extinction ratio detector connected with a polarization maintaining isolator connected with a signal end of the polarization maintaining wavelength division multiplexer; and when the residual pumping power displayed by the power meter reaches the maximum value and the laser polarization extinction ratio displayed by the extinction ratio detector reaches the maximum value, indicating that the phase-shift fiber grating is aligned with the polarization-maintaining fiber.
In combination with the third embodiment of the second aspect, the polarization maintaining fiber is a PM980 fiber or a PM1550 fiber.
In combination with the fourth embodiment of the second aspect, the phase-shifted fiber grating is an erbium-doped phase-shifted fiber grating.
The polarization maintaining distributed feedback fiber laser provided by the embodiment of the invention comprises: the device comprises a pumping source, a phase-shift fiber grating, a polarization-maintaining wavelength division multiplexer and a polarization-maintaining isolator; the front end of the phase-shift fiber grating is a single-mode fiber, and the rear end of the phase-shift fiber grating is a polarization maintaining fiber; and the pump light generated by the pump source is transmitted to the phase-shift fiber grating through the single-mode fiber, and mixed light comprising the linearly polarized narrow linewidth laser and residual pump light is output. The mixed light is output to the polarization maintaining wavelength division multiplexer through the polarization maintaining optical fiber, the linearly polarized narrow linewidth laser is output to the polarization maintaining isolator through a signal end of the polarization maintaining wavelength division multiplexer to form polarization maintaining narrow linewidth laser output, and the residual pump light is output through a pump end of the polarization maintaining wavelength division multiplexer. The polarization-maintaining and polarization-maintaining distributed feedback fiber laser adopts a distributed feedback structure, so that the structure of the fiber laser is simpler compared with narrow-linewidth lasers with annular cavities and distributed Bragg reflection structures, extra loss caused by operations such as optical fiber welding and the like does not exist in the cavities, the output characteristic of a single longitudinal mode is more stable, and the relative intensity noise and the phase noise of laser are lower; and secondly, the polarization-maintaining laser is output in a polarization-maintaining mode, and the laser has a linear polarization maintaining characteristic, so that the application requirement of a sensing system with a polarization-maintaining requirement is met, and the selectivity is more flexible when people select the laser.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 shows a schematic structural diagram of a distributed feedback fiber laser provided in an embodiment of the present invention.
Fig. 2 is a flow chart of a method for manufacturing a phase-shift fiber grating according to an embodiment of the present invention.
Fig. 3 shows a flowchart of step S102 in fig. 2 according to an embodiment of the present invention.
Fig. 4 shows a flowchart of step S202 in fig. 3 according to an embodiment of the present invention. .
Fig. 5 is a schematic diagram illustrating a relationship rule between a laser polarization extinction ratio and a fiber rotation angle according to an embodiment of the present invention.
Fig. 6 shows a schematic diagram of a laser polarization characteristic test of a phase-shifted fiber grating according to an embodiment of the present invention.
Icon: 100-polarization maintaining distributed feedback fiber laser; 110-a pump source; 120-phase shift fiber grating; 130-polarization maintaining wavelength division multiplexer; 140-polarization maintaining isolator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Narrow-linewidth fiber lasers are widely used in many fields as coherent light sources, but in some applications of fiber sensors, in order to reduce signal distortion and improve detection sensitivity, the narrow-linewidth lasers are required to have linear polarization maintaining characteristics.
In view of the above, the present inventors provide a polarization maintaining distributed feedback fiber laser 100 with such a feature to meet the application requirements of the sensing system with polarization maintaining requirements. As shown in fig. 1, the polarization maintaining distributed feedback fiber laser 100 includes: a pump source 110, a phase-shifting fiber grating 120, a polarization-maintaining wavelength division multiplexer 130 and a polarization-maintaining isolator 140.
The front end of the phase-shift fiber grating 120 is a single-mode fiber, and the rear end of the phase-shift fiber grating 120 is a polarization maintaining fiber; the pump light generated by the pump source 110 is transmitted to the phase-shift fiber grating 120 through the single-mode fiber, and mixed light including the linearly polarized narrow linewidth laser and the residual pump light is output; the mixed light is output to the polarization maintaining wavelength division multiplexer 130 through the polarization maintaining optical fiber, the linearly polarized narrow linewidth laser is output to the polarization maintaining isolator 140 through a signal end of the polarization maintaining wavelength division multiplexer 130 to form polarization maintaining narrow linewidth laser output, and the residual pump light is output through a pump end of the polarization maintaining wavelength division multiplexer 130.
The polarization maintaining distributed feedback fiber laser 100 adopts the single phase shift fiber grating 120 to provide mode feedback and wavelength selection, has a simple structure, does not have extra loss caused by operations such as fiber fusion welding and the like in a cavity, has more stable single longitudinal mode output characteristics, lower laser relative intensity noise and phase noise, and simultaneously has polarization maintaining output characteristics, thereby well meeting the application requirements of a sensing system with polarization maintaining requirements.
The pump source 110 is a pump source that generates pump light with a wavelength of 980nm or 1480 nm. I.e., the pump light generated by the pump source 110 has a wavelength of 980nm, or 1480 nm. The phase shift fiber grating 120 is an erbium-doped phase shift fiber grating, and the phase shift fiber grating 120 may also be an ytterbium fiber phase shift fiber grating. It should be noted that, when the phase-shifted fiber grating 120 may also be an ytterbium fiber phase-shifted fiber grating, the types of the pumping source 110, the polarization maintaining wavelength division multiplexer 130, the polarization maintaining fiber, and other devices may also be changed accordingly, so that the pumping source corresponds to the ytterbium fiber phase-shifted fiber grating.
Wherein the polarization maintaining optical fiber is a PM980 optical fiber or a PM1550 optical fiber.
Wherein the polarization maintaining wavelength division multiplexer 130 is an 980/1550 polarization maintaining wavelength division multiplexer or a 1480/1550 polarization maintaining wavelength division multiplexer.
It should be noted that, when the wavelength of the pump light is 980nm, the polarization maintaining fiber is a PM980 fiber, and the polarization maintaining wavelength division multiplexer 130 is an 980/1550 polarization maintaining wavelength division multiplexer. When the wavelength of the pump light is 1480nm, the polarization maintaining fiber is a PM1550 fiber, and the polarization maintaining wavelength division multiplexer 130 is an 1480/1550 polarization maintaining wavelength division multiplexer.
The embodiment of the present invention further provides a method for manufacturing the polarization maintaining distributed feedback fiber laser 100, as shown in fig. 2, and the following description will be made with reference to the steps included in fig. 2.
Step S101: and cutting the single mode fiber at the rear end of the phase shift fiber grating.
Based on the existing phase shift fiber grating, the single mode fiber at the rear end of the phase shift fiber grating is cut off by a cutting knife, for example, the single mode fiber of the output tail fiber of the existing erbium-doped phase shift fiber grating is cut off by the cutting knife.
Step S102: and welding a polarization maintaining fiber at one end of the phase-shifting fiber grating from which the single-mode fiber is cut.
And after the single-mode fiber is cut off, welding a polarization-maintaining fiber at one end of the phase-shift fiber grating from which the single-mode fiber is cut off to realize polarization-maintaining output. Further, the procedure of welding will be described with reference to the steps shown in fig. 3.
Step S201: and respectively clamping the phase-shift fiber grating and the polarization maintaining fiber by utilizing a polarization maintaining fusion splicer.
When one end of the phase-shift fiber grating, from which the single-mode fiber is cut, is welded with the polarization-maintaining fiber, the phase-shift fiber grating and the polarization-maintaining fiber can be respectively clamped by a polarization-maintaining fusion splicer so as to align the polarization directions and the geometric structures of the fibers at two ends.
Step S202: aligning the phase-shifted fiber grating with the polarization-maintaining fiber by rotating the phase-shifted fiber grating or the polarization-maintaining fiber.
And clamping the phase-shift fiber grating and the polarization maintaining fiber end to end by using a polarization maintaining fusion splicer, and aligning the phase-shift fiber grating and the polarization maintaining fiber by rotating the phase-shift fiber grating or the polarization maintaining fiber. As an alternative embodiment, the phase-shifting fiber grating may be aligned to the polarization-maintaining fiber by a technique of rotating the polarization-centered axis of the fiber. Further, the procedure of welding will be described with reference to the steps shown in fig. 4.
Step S301: and starting a pumping source connected to the front end of the phase-shift fiber bragg grating so as to enable the output line of the phase-shift fiber bragg grating to output the polarized laser with narrow linewidth.
And after the phase-shift fiber grating and the polarization maintaining fiber are respectively clamped by a polarization maintaining fusion splicer, starting a pumping source connected to the front end of the phase-shift fiber grating so as to output line polarization narrow linewidth laser of the phase-shift fiber grating. The pump light output by the pump source is transmitted to the phase-shift fiber grating through the single-mode fiber, so that the output line of the phase-shift fiber grating is polarized with the narrow linewidth laser.
Step S302: and adjusting the indication number of a power meter connected with a pumping end of a polarization maintaining wavelength division multiplexer connected with the rear end of the polarization maintaining fiber by rotating the phase shift fiber grating or the polarization maintaining fiber, and adjusting the indication number of an extinction ratio detector connected with a polarization maintaining isolator connected with a signal end of the polarization maintaining wavelength division multiplexer.
And adjusting the indication number of a power meter connected with a pumping end of a polarization maintaining wavelength division multiplexer connected with the rear end of the polarization maintaining fiber by rotating the phase shift fiber grating or the polarization maintaining fiber, and adjusting the indication number of an extinction ratio detector connected with a polarization maintaining isolator connected with a signal end of the polarization maintaining wavelength division multiplexer. Namely, the rear end of the polarization maintaining fiber is connected with the common end of the polarization maintaining wavelength division multiplexer, the signal end of the polarization maintaining wavelength division multiplexer is connected with the polarization maintaining isolator, the pumping end of the polarization maintaining wavelength division multiplexer is connected with the power meter, and the output end of the polarization maintaining isolator is connected with the extinction ratio detector, refer to fig. 1.
The power meter is used for monitoring the residual pumping power of the pumping end, and the extinction ratio detector is used for monitoring the laser polarization extinction ratio output by the polarization-maintaining isolator.
Step S303: and when the residual pumping power displayed by the power meter reaches the maximum value and the laser polarization extinction ratio displayed by the extinction ratio detector reaches the maximum value, indicating that the phase-shift fiber grating is aligned with the polarization-maintaining fiber.
By rotating the phase-shift fiber grating or the polarization maintaining fiber, when the residual pumping power displayed by the power meter reaches the maximum value and the laser polarization extinction ratio displayed by the extinction ratio detector reaches the maximum value, the phase-shift fiber grating is aligned with the polarization maintaining fiber. Even if the linear polarization direction of the linear polarization narrow linewidth laser output by the phase-shifting fiber grating is aligned with the slow axis direction of the polarization-maintaining fiber, the phase-shifting fiber grating is aligned with the geometric structure of the polarization-maintaining fiber.
The residual pumping power displayed by the power meter reaches the maximum value, which indicates that the phase-shift fiber grating is aligned with the polarization-maintaining fiber in structure, and when the laser polarization extinction ratio displayed by the extinction ratio detector reaches the maximum value, which indicates that the linear polarization direction of the linear polarization narrow-linewidth laser output by the phase-shift fiber grating is aligned with the slow axis direction of the polarization-maintaining fiber.
To facilitate understanding of the above process, the process is described with reference to fig. 5, and the change of the laser polarization extinction ratio is obviously monitored along with the change of the rotation angle of the optical fiber in the process of rotating the polarization counter-axis of the optical fiber. Taking the polarization maintaining fiber as an example, and rotating the phase shift grating side, the law of the relationship between the measured laser polarization extinction ratio and the rotation angle of the random starting point is shown in fig. 5. The graph shows the case of recording the laser polarization extinction ratio for each 10 ° rotation of the erbium-doped phase-shift grating, and the values for clockwise and counterclockwise rotation are measured for each angle to ensure the measurement accuracy. The square black line is the result when no polarization maintaining isolator (PM-ISO) is added on the optical path, and because the fast axis and the slow axis of the polarization maintaining wavelength division multiplexer (PM-WDM) work, when the linear polarization direction of the laser is opposite to the fast axis or the slow axis of the upper polarization maintaining fiber, a higher polarization extinction ratio can be obtained, and the extinction ratio changes with the angle by taking 90 degrees as a period. The circular black line is the result measured in the same measuring mode after a polarization maintaining isolator (PM-ISO) is added on the light path, and because the PM-ISO works in a slow axis and a fast axis is cut off, the polarization extinction ratio of the output laser is in a high value only when the linear polarization direction of the laser is aligned with the slow axis of the polarization maintaining tail fiber. In this case, the extinction ratio should be 180 ° in period with the change of angle, and it is inconvenient to measure more angles because the polarization maintaining fusion splicer cannot rotate the shaft infinitely. However, the above results have demonstrated that the technical method of rotating the polarization axis of the fiber can realize the output of high polarization extinction ratio of narrow linewidth laser.
Step S203: after the phase-shift fiber grating is aligned with the polarization maintaining fiber, the polarization maintaining fusion splicer discharges to fuse the polarization maintaining fiber to one end of the phase-shift fiber grating from which the single-mode fiber is cut.
After the phase-shift fiber grating is aligned with the polarization-maintaining fiber, the polarization-maintaining fusion splicer discharges to fuse the polarization-maintaining fiber to one end of the phase-shift fiber grating from which the single-mode fiber is cut, so that the polarization-maintaining distributed feedback fiber laser with the polarization-maintaining output characteristic can be obtained.
In order to further verify the laser polarization characteristics of the polarization maintaining distributed feedback fiber laser obtained by the method, the inventors of the present application also measured the polarization state of the polarization maintaining output narrow-linewidth fiber laser manufactured after discharge welding, as shown in fig. 6. This figure shows the results of the polarization analyzer measurements, with the output laser having a degree of polarization (DOP) of 1, indicating that it is fully polarized. The polarization characteristic point is positioned on the equator of the Poincare sphere, which shows that the polarization characteristic point is linearly polarized light, and the polarization state of the lower right corner is basically linearly polarized light.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The manufacturing method provided by the embodiment of the present invention has the same implementation principle and technical effect as those of the foregoing embodiments of the polarization maintaining distributed feedback fiber laser 100, and for the sake of brief description, no mention is made in the apparatus or method embodiments, and reference may be made to each other.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for manufacturing a polarization maintaining distributed feedback fiber laser, comprising:
cutting off the single mode fiber at the rear end of the phase-shift fiber grating;
welding a polarization maintaining fiber at one end of the phase-shifting fiber grating from which the single-mode fiber is cut;
wherein, one end of the phase shift fiber grating from which the single mode fiber is cut is fusion spliced with the polarization maintaining fiber, comprising:
respectively clamping the phase-shift fiber grating and the polarization maintaining fiber by utilizing a polarization maintaining fusion splicer;
starting a pumping source connected to the front end of the phase-shift fiber bragg grating so as to enable the output line of the phase-shift fiber bragg grating to output line polarization narrow linewidth laser;
adjusting the reading of a power meter connected with a pumping end of a polarization maintaining wavelength division multiplexer connected with the rear end of the polarization maintaining fiber by rotating the phase shift fiber grating or the polarization maintaining fiber, and adjusting the reading of an extinction ratio detector connected with a polarization maintaining isolator connected with a signal end of the polarization maintaining wavelength division multiplexer;
when the residual pumping power displayed by the power meter reaches the maximum value and the laser polarization extinction ratio displayed by the extinction ratio detector reaches the maximum value, indicating that the phase-shift fiber grating is aligned with the polarization-maintaining fiber;
after the phase-shift fiber grating is aligned with the polarization maintaining fiber, the polarization maintaining fusion splicer discharges to fuse the polarization maintaining fiber to one end of the phase-shift fiber grating from which the single-mode fiber is cut.
2. The method of manufacturing of claim 1, wherein the polarization maintaining fiber is a PM980 fiber or a PM1550 fiber.
3. The method of manufacturing according to claim 2, wherein the phase-shifted fiber grating is an erbium-doped phase-shifted fiber grating.
4. A polarization maintaining distributed feedback fiber laser made by the method of claim 1, comprising: the device comprises a pumping source, a phase-shift fiber grating, a polarization-maintaining wavelength division multiplexer and a polarization-maintaining isolator;
the front end of the phase-shift fiber grating is a single-mode fiber, and the rear end of the phase-shift fiber grating is a polarization maintaining fiber;
the pump light generated by the pump source is transmitted to the phase-shift fiber grating through the single-mode fiber, and mixed light comprising the linearly polarized narrow linewidth laser and the residual pump light is output;
the mixed light is output to the polarization maintaining wavelength division multiplexer through the polarization maintaining optical fiber, the linearly polarized narrow linewidth laser is output to the polarization maintaining isolator through a signal end of the polarization maintaining wavelength division multiplexer to form polarization maintaining narrow linewidth laser output, and the residual pump light is output through a pump end of the polarization maintaining wavelength division multiplexer.
5. The polarization maintaining distributed feedback fiber laser of claim 4, wherein the pump source is a pump source generating 980nm or 1480nm wavelength pump light.
6. The polarization maintaining dfb fiber laser of claim 5, wherein the phase-shifted fiber grating is an erbium doped phase-shifted fiber grating.
7. The polarization maintaining distributed feedback fiber laser of claim 6, wherein the polarization maintaining fiber is a PM980 fiber or a PM1550 fiber.
8. The polarization maintaining distributed feedback fiber laser of claim 7, wherein said polarization maintaining wavelength division multiplexer is an 980/1550 polarization maintaining wavelength division multiplexer or a 1480/1550 polarization maintaining wavelength division multiplexer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810566744.8A CN108711727B (en) | 2018-06-04 | 2018-06-04 | Polarization maintaining distributed feedback fiber laser and manufacturing method thereof |
| FR1857654A FR3082062B1 (en) | 2018-06-04 | 2018-08-24 | FIBER OPTIC LASER POLARIZATION MAINTENANCE DEVICE WITH DISTRIBUTED FEEDBACK AND METHOD OF MANUFACTURING |
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| CN114325930A (en) * | 2021-12-09 | 2022-04-12 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Laser multiplexing device of triangle-arranged grating magneto-optical trap |
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