CN117080851A - Laser based on asymmetric saturated absorber and laser single longitudinal mode output method - Google Patents
Laser based on asymmetric saturated absorber and laser single longitudinal mode output method Download PDFInfo
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
Abstract
The disclosure provides a laser based on an asymmetric saturated absorber and a laser single longitudinal mode output method, comprising the following steps: a pump laser configured to emit laser light; an integrator configured to integrate and reflect the laser light; the gain fiber is configured to receive the laser reflected by the integrator and perform stimulated radiation to obtain initial second laser; a first circulator configured to control unidirectional operation of the laser within the main cavity; a uniform Bragg grating configured to filter the initial second laser to obtain a second laser; and one end of the asymmetric saturated absorber is connected with the third port of the first circulator, and the other end of the asymmetric saturated absorber is connected with the third port of the integrator and is configured to filter the second laser to obtain third laser. The first sub-laser and the second sub-laser are obtained by dividing the laser through the asymmetric power saturated absorber, and then the dynamic grating is formed after passing through the asymmetric power saturated absorber, so that single longitudinal mode output is realized.
Description
Technical Field
The disclosure relates to the field of fiber lasers, in particular to a laser based on an asymmetric saturated absorber and a laser single longitudinal mode output method.
Background
The saturated absorber mainly forms standing waves in a certain medium through two paths of opposite light, and forms a dynamic grating due to the saturation gain effect of the medium, and the grating has the characteristic of a narrow-band filter. The main current saturated absorber structures are reflective saturated absorbers composed of FBG and circulator and saturated absorbers of sagnac (sagnac) structure.
The filter formula of the sagnac loop structure is completely deduced at present, the main simulation is to influence the length of two arms on the filter performance, and the input optical power assumption of the two arms for most experiments is approximately the same. In the actual process, the optical power of the two arms is practically always asymmetric due to factors such as the influence of the device. And the transmission spectrum of the saturated absorber is very closely related to the structure of the structure.
In view of this, how to realize single longitudinal mode output of laser light under the condition of asymmetric power becomes an important research problem.
Disclosure of Invention
In view of the above, the disclosure is directed to a laser and a laser single longitudinal mode output method based on an asymmetric saturated absorber, which are used for solving or partially solving the above-mentioned problems.
In view of the above object, a first aspect of the present disclosure provides a laser based on an asymmetric saturated absorber, comprising:
a pump laser configured to pump the emitted laser light;
the integrator comprises a first port, a second port, a third port and a fourth port, wherein the first port of the integrator is connected with the output end of the pump laser and is configured to collect and reflect the laser;
the gain fiber is connected with the second port of the integrator and is configured to receive the laser reflected by the integrator and perform stimulated radiation to obtain initial second laser;
a first circulator having a first port connected to the gain fiber and configured to control unidirectional operation of the initial second laser within the laser main cavity, wherein the unidirectional operation is in a direction from the first port of the first circulator to the second port of the first circulator to the third port of the first circulator;
the uniform Bragg grating is connected with the second port of the first circulator and is configured to filter the initial second laser to obtain second laser;
and one end of the asymmetric saturated absorber is connected with the third port of the first circulator, the other end of the asymmetric saturated absorber is connected with the third port of the integrator, the asymmetric saturated absorber is configured to filter the second laser to obtain third laser, the third laser is sent to the third port of the integrator, and the third laser is output through the third port of the integrator.
Based on the same inventive concept, a second aspect of the present disclosure proposes a laser single longitudinal mode output method based on an asymmetric saturated absorber, comprising:
acquiring first laser emitted by a pumping laser, wherein the first laser comprises at least one laser with a wavelength;
filtering the first laser through a uniform Bragg grating to obtain second laser;
injecting the second laser into an optical coupler, and dividing the second laser by using the optical coupler to obtain a first sub-laser and a second sub-laser;
the first sub-laser is sent to an unpumped erbium-doped fiber, and the second sub-laser is reversely sent to the unpumped erbium-doped fiber by using a second circulator;
the first sub-laser and the second sub-laser utilize the unpumped erbium-doped fiber to perform standing wave interference to obtain third laser, wherein the third laser is laser with the same wavelength;
and outputting the third laser through the integrator.
Based on the same inventive concept, a third aspect of the present disclosure proposes a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method as described above.
From the above, it can be seen that the present disclosure provides a laser and a laser single longitudinal mode output method based on an asymmetric saturated absorber, where the asymmetric saturated absorber is used to divide laser light to obtain a first sub-laser and a second sub-laser, where the power of the first sub-laser is different from that of the second sub-laser, and the first sub-laser and the second sub-laser form a dynamic grating after passing through the asymmetric saturated absorber, so as to realize single longitudinal mode output.
Drawings
In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the embodiments or related art description will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
FIG. 1 is a schematic diagram of an asymmetric saturated absorber-based laser in an embodiment of the present disclosure;
FIG. 2 is a flow chart of a laser single longitudinal mode output method based on an asymmetric saturated absorber in accordance with an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a simulated image of a third laser output according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a laser transmission direction according to an embodiment of the disclosure.
Reference numerals illustrate:
1, a pump laser, 2, an integrator, 3, a gain fiber, 4 a first circulator, 5, 6, 7, a temperature controller;
an optical coupler 601, a second circulator 602, an unpumped erbium doped fiber 603;
a first port 201 of an integrator, a second port 202 of the integrator, a third port 203 of the integrator, and a fourth port 204 of the integrator;
a first port 401 of a first circulator, a second port 402 of the first circulator, a third port 403 of the first circulator, a fourth port 404 of the first circulator;
a first port 6011 of the optocoupler, a second port 6012 of the optocoupler, and a third port 6013 of the optocoupler;
a first port 6021 of a second circulator, a second port 6022 of the second circulator, and a third port 6023 of the second circulator.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The terms referred to in this disclosure are explained as follows:
pump: the pumping laser is a physical performance testing instrument used in the fields of electronic and communication technology, information and system science related engineering and technology;
the Integrator: an integrator;
EDF: an erbium-doped fiber (EDF), which is a fiber doped with a small amount of rare earth erbium and is mainly used for internally arranging microprocessor software;
CIR1: the first circulator is a multi-port device that sequentially transmits an incident wave entering any one port thereof into the next port in a direction determined by the static bias magnetic field. The circulator is also called an isolator and is a non-reversible device with a plurality of ends, and has the remarkable characteristics of being capable of unidirectionally transmitting high-frequency signal energy;
CIR2: a second circulator (circulator);
FBG: a uniform Bragg grating (Fiber Bragg Grating, FBG), i.e. a grating with a periodic distribution of spatial phases formed in the core, the essence of its effect being the formation of a narrow band (transmissive or reflective) filter or mirror in the core;
OC: an Optical Coupler (OC) which is a device for dividing an optical signal from one optical fiber into a plurality of optical fibers;
SA: an asymmetric saturated absorber (saturable absorber, SA) is a switching crystal material used in the Q-switching technology in the laser resonator;
TC: the temperature controller (Temperature controller, TC) is physically deformed inside the switch according to the temperature change of the working environment, so that certain special effects are generated, a series of automatic control elements for conducting or disconnecting actions are generated, or the electronic elements are used for providing temperature data for the circuit according to different principles of working states at different temperatures, so that the temperature data are collected for the circuit.
Based on the above description, this embodiment proposes a laser based on an asymmetric saturated absorber, as shown in fig. 1, including:
a pump laser 1 configured to pump the emitted laser light;
an integrator 2, the integrator 2 comprising a first port 201, a second port 202, a third port 203 and a fourth port 204, the first port 201 of the integrator 2 being connected to the output of the pump laser 1 and configured to collect and reflect the laser light;
a gain fiber 3 connected to the second port 202 of the integrator 2 and configured to receive the laser light reflected from the integrator 2 and perform stimulated radiation to obtain an initial second laser light;
a first circulator 4, a first port 401 of the first circulator 4 being connected to the gain fiber 3 and configured to control unidirectional operation of the initial second laser within the laser main cavity, wherein the unidirectional operation is in a direction from the first port 401 of the first circulator to the second port 402 of the first circulator to the third port 403 of the first circulator;
a uniform bragg grating 5 connected to the second port 402 of the first circulator 4 and configured to filter the initial second laser light to obtain a second laser light;
an asymmetric saturation absorber 6, one end of which is connected to the third port 403 of the first circulator 4, and the other end of which is connected to the third port 203 of the integrator 2, and configured to filter the second laser light to obtain a third laser light, send the third laser light to the third port of the integrator, and output the third laser light via the third port of the integrator;
in practice, the pump laser 1 emits laser light, the laser light is injected into the integrator 2 through the first port 201 of the integrator 2, the injected laser light is reflected by the integrator 2 in a collective manner, and the laser light is output into the main cavity of the laser based on the asymmetric saturated absorber through the second port 202 of the integrator 2.
The output laser is amplified through the gain grating 3, stimulated radiation is carried out, stimulated radiation effect occurs, and initial second laser is obtained. The initial second laser is input through the first port 401 of the first circulator 4, and the laser in the first circulator is operated in a unidirectional mode, and the operation direction is from the first port of the first circulator to the second port of the first circulator to the third port of the first circulator. And filtering the laser input into the uniform Bragg grating 5 by using the uniform Bragg grating 5 to obtain second laser, and re-injecting the second laser back into the main cavity after reflection.
The method comprises the steps of dividing laser to obtain a first sub-laser and a second sub-laser through an asymmetric power saturated absorber, wherein the power of the first sub-laser is different from that of the second sub-laser, and the first sub-laser and the second sub-laser form a dynamic grating after passing through the asymmetric power saturated absorber so as to realize single longitudinal mode output.
The third laser light is input into the integrator 2 from a third port 203 of the integrator 2, and a part of the third laser light is output from the integrator 2 via a fourth port 204 of the integrator 2.
In some embodiments, the integrator comprises at least one of: the laser device comprises a wavelength division multiplexer and a coupler, wherein the wavelength division multiplexer is used for laser injection, and the coupler is used for laser output.
In some embodiments, the asymmetric saturated absorber 6 comprises an optical coupler 601, a second circulator 602, and an unpumped erbium doped fiber 603;
an optical coupler 601, wherein a first port 6011 of the optical coupler 601 is connected to a third port 4013 of the first circulator 4, and is configured to divide the second laser light to obtain a first sub-laser light and a second sub-laser light;
a second circulator 602, a first port 6021 of the second circulator 602 being connected to a second port 6012 of the optical coupler 601, a third port 6023 of the second circulator 602 being connected to a third port 203 of the integrator 2, configured to control unidirectional operation of the laser within the laser main cavity, wherein the unidirectional operation is in a direction from a first port of the second circulator to a second port of the second circulator to a third port of the second circulator;
the unpumped erbium doped fiber 603 has one end connected to the third port 6013 of the optical coupler 601 and the other end connected to the second port 6022 of the second circulator 602, and is configured to receive the first sub-laser and the second sub-laser, and perform standing wave interference to obtain a third laser.
In a specific implementation, the second laser is injected into the optical coupler 601 through the first port 6011 of the optical coupler 601, and the second laser is split by the optical coupler 601 to obtain a first sub-laser and a second sub-laser, wherein the power of the first sub-laser is different from that of the second sub-laser.
The first sub-laser light is output to the unpumped erbium doped fiber 603 via a third port 6013 of the optical coupler 601;
the second sub-laser light is output from the second port 6012 of the optical coupler 601 and input into the second circulator 602 from the first port 6021 of the second circulator 602. And is output back to the unpumped erbium doped fiber 603 through the second port 6022 of the second circulator 602.
The first sub-laser and the second sub-laser generate standing wave interference in the unpumped erbium-doped fiber 603, so that the absorption coefficient of the erbium-doped fiber changes periodically, the absorption at the crest of the standing wave light field is weak, the absorption at the trough is strong, and a periodic refractive index grating is formed.
In some embodiments, the devices are connected by fusion-splicing except for the temperature controller.
In some embodiments, the laser further comprises:
and a temperature controller 7, which is wrapped outside the uniform Bragg grating 5, is connected with the uniform Bragg grating 5, and is configured to control the temperature of the uniform Bragg grating 5.
In the specific implementation, the temperature controller wrapped outside the uniform Bragg grating and connected with the uniform Bragg grating is used for controlling the temperature of the uniform Bragg grating, tuning the output wavelength of the laser based on the asymmetric saturated absorber and ensuring the stability of the filtering center of the laser.
In some embodiments, the optocoupler 601 may include at least one of: a 1 x 2 optical coupler or a 2 x 2 optical coupler, the optical coupler being a standard single mode fiber coupler having a preset split ratio, wherein the preset split ratio range is 10:90 to 90: the exemplary preset splitting ratio may include at least one of: 10: 90. 20: 80. 25: 75. 30: 70. 40: 60. 60: 40. 70: 30. 80: 20. 90:10.
the asymmetric saturated absorber is actually equivalent to an ultra-narrow band filter, and performs narrower filtering once under the rough filtering of the fiber bragg grating, so that a certain mode of the laser is guaranteed to be in a dominant position in the subsequent gain competition, and finally is stabilized in a single longitudinal mode state.
In some embodiments, the pump laser 1 is a 980nm pump laser.
In some embodiments, the integrator 2 is a 980/1550nm integrator, and the integrator 2 in this embodiment is preferably model number
PMTIWDM-1598-F-S-40-PM1550/PM980-1-0/1-F integrator. The first port 201 of the integrator 2 is a 980nm port, the second port 202 of the integrator 2 is a 1550nm port, the third port 203 of the integrator 2 is a 1550nm port, and the fourth port 204 of the integrator 2 is a 1550nm port.
In some embodiments, the gain fiber 3 is an erbium doped fiber having a high doping concentration, and the unpumped erbium doped fiber 603 is an erbium doped fiber having a low doping concentration.
In some embodiments, the uniform Bragg grating 5 peak reflectivity and 3dB bandwidth are 96% and 0.18nm, respectively.
Based on the same inventive concept, corresponding to the above embodiment, the present disclosure further provides a laser single longitudinal mode output method based on an asymmetric saturated absorber, as shown in fig. 2, the method includes:
step 201, obtaining a first laser emitted by a pump laser, wherein the first laser includes at least one wavelength laser.
In specific implementation, the pump laser emits first laser light, wherein the first laser light comprises at least one laser light, and the first laser light comprises at least one laser light with a wavelength.
Step 202, filtering the first laser through a uniform Bragg grating to obtain a second laser.
In the specific implementation, the first laser is subjected to preliminary filtration through the uniform Bragg grating, and the laser with the wavelength which is too different from the target wavelength is filtered to obtain the second laser.
And step 203, injecting the second laser into an optical coupler, and dividing the second laser by using the optical coupler to obtain a first sub-laser and a second sub-laser.
In specific implementation, the second laser is split by using an optical coupler to obtain a first sub-laser and a second sub-laser, wherein the optical coupler is a standard single-mode fiber coupler with a beam splitting ratio being a preset beam splitting ratio, and the range of the preset beam splitting ratio is 10:90 to 90: the exemplary preset splitting ratio may include at least one of: 10: 90. 20: 80. 25: 75. 30: 70. 40: 60. 60: 40. 70: 30. 80: 20. 90:10, so that the power of the first sub-laser is different from the power of the second sub-laser.
And 204, sending the first sub-laser to an unpumped erbium-doped fiber, and reversely sending the second sub-laser to the unpumped erbium-doped fiber by using a second circulator.
In specific implementation, the first sub-laser is output to the unpumped erbium-doped fiber through a third port of the optical coupler;
outputting the second sub-laser from the second port of the optical coupler, and inputting the second sub-laser into the second circulator from the first port of the second circulator. And reversely outputting the fiber to the unpumped erbium-doped fiber through a second port of the second circulator.
In step 205, the first sub-laser and the second sub-laser perform standing wave interference by using the unpumped erbium-doped fiber to obtain a third laser, where the third laser is a laser with the same wavelength.
The first sub-laser comprises a sub-laser used for forming standing wave interference and other sub-lasers, the sub-laser used for forming standing wave interference and the second sub-laser form a standing wave interference effect in the unpumped erbium-doped fiber, and the other sub-lasers are controlled to pass through the standing wave interference effect. And finally obtaining third laser, wherein the third laser comprises sub lasers forming standing wave interference and other sub lasers passing through the standing wave interference effect.
The first sub-lasers and the second sub-lasers generate standing wave interference in the unpumped erbium-doped optical fiber, so that the absorption coefficient of the erbium-doped optical fiber is periodically changed, the absorption of the crest of the standing wave light field is weak, the absorption of the trough of the standing wave light field is strong, and then a periodic refractive index grating is formed.
Step 206, outputting the third laser through the integrator.
For example, when the splitting ratio of the optical coupler is 80:20, a simulation image of the output third laser is shown in fig. 3, where k is the coupling ratio, that is, the ratio of the first sub-laser to the second laser.
In some embodiments, the derivation process using the formula in step 205 is as follows, as shown in FIG. 4:
step A, assuming that the coupling ratio of the optical coupler is k, the light intensity relation of the output of the optical coupler is expressed as follows by a formula:
wherein E is 1 a For the intensity of the second laser entering the optical coupler, E 2 a For the light intensity of the second sub-laser light out-coupling coupler, E 3 a For the light intensity of the first sub-laser out-coupling, k is the coupling ratio.
Step B, after the first sub-laser and the second sub-laser are transmitted in the laser through the optical fiber, the light intensity before the first sub-laser enters the unpumped erbium-doped optical fiber is expressed as follows by a formula:
wherein E is 3f a Is the light intensity of the first sub-laser transmitted by the optical fiber, beta L 3 Is the third transmission coefficient.
The light intensity of the second sub-laser transmitted through the optical fiber is expressed as:
wherein E is 2f a Is the light intensity of the second sub-laser transmitted by the optical fiber, beta L 2 Is the second transmission coefficient.
And C, after the second sub-laser passes through the second circulator, the light intensity output through the second port of the second circulator is expressed as follows by a formula:
wherein E is 2f t A, the light intensity of the second sub-laser output by the second port of the second circulator cir Is the proportion of the remaining laser light as it passes through the second circulator.
The light intensity of the second sub-laser output through the second output port of the second circulator and transmitted through the optical fiber is expressed as follows by a formula:
wherein E is 2f t1 And the second sub-laser output through the second output port of the second circulator is transmitted by the optical fiber to obtain the light intensity.
Step D, the propagation matrix of the uniform Bragg grating is expressed as follows by a formula:
wherein delta is the direct current self-coupling coefficient of the optical fiber, and k is the alternating current coupling coefficient of the optical fiber, whereinλ B The center emission wavelength of the bragg grating is uniform when the refractive index variation Δn is 0.
After standing wave interference effect, the light intensity reversely output by the unpumped erbium-doped fiber is expressed as follows:
wherein E is 2f t2 To the light intensity reversely output by the unpumped erbium-doped fiber after the standing wave interference effect, F 12 Is part of a uniform bragg grating propagation matrix.
The intensity of light output via the unpumped erbium-doped fiber after standing wave interference effect is expressed by the formula:
wherein F is 4 a F is the light intensity output by the unpumped erbium-doped fiber after standing wave interference effect 22 Is part of a uniform bragg grating propagation matrix.
Step E, according to the E obtained in the above step 3f a And E is 2f t1 The third laser intensity output by the unpumped erbium-doped fiber after the standing wave interference effect is obtained is expressed as follows:
and F, after the third laser is transmitted through the optical fiber, the light intensity before being input to the second port of the second circulator is expressed as follows by a formula:
wherein E is 4f a The light intensity of the third laser light transmitted through the optical fiber.
Step G, the light intensity of the third laser light output through the third port of the second circulator is expressed as:
wherein E is 5 a Is the light intensity of the third laser light after being output via the third port of the second circulator.
Thus, the transfer function of an asymmetric saturated absorber is formulated as:
wherein,is the transfer function of an asymmetrically saturated absorber.
Assuming that there is no device loss during the transmission of the second circulator, that is, the proportion of the remaining laser light passing through the second circulator is 1, the transfer function of the asymmetric saturated absorber is:
in some embodiments, the temperature of the uniform Bragg grating is controlled by a temperature controller, and the output wavelength of the laser based on the asymmetric saturated absorber is tuned to ensure the stability of the filtering center of the laser.
In some embodiments, step 202 specifically includes:
step 2021, injecting the first laser into the integrator.
And 2022, performing reflection treatment by the integrator, and injecting the reflected first laser into the gain fiber.
And 2023, performing stimulated radiation on the reflected first laser by using the gain fiber to obtain an initial second laser.
And step 2024, transmitting the initial second laser to a uniform Bragg grating by using a first circulator, and filtering by using the uniform Bragg grating to obtain the second laser.
In specific implementation, the pump laser emits laser light, the laser light is injected into the integrator through a first port of the integrator, the injected laser light is subjected to collective reflection through the integrator, and the laser light is output into a main cavity of the laser based on the asymmetric saturated absorber through a second port of the integrator.
And amplifying the output laser through the gain grating, performing stimulated radiation, and generating a stimulated radiation effect to obtain an initial second laser. The initial second laser is input through a first port of the first circulator, the laser in the first circulator runs unidirectionally, and the running direction is from the first port of the first circulator to a second port of the first circulator to a third port of the first circulator. And filtering the laser input into the uniform Bragg grating by using the uniform Bragg grating, and re-injecting the second laser back into the main cavity after obtaining the second laser.
It should be noted that the method of the embodiments of the present disclosure may be performed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the methods of embodiments of the present disclosure, the devices interacting with each other to accomplish the methods.
It should be noted that the foregoing describes some embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Based on the same inventive concept, corresponding to any of the above embodiments of the method, the present disclosure further provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the asymmetric saturated absorber-based laser single longitudinal mode output method as described in any of the above embodiments.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
The storage medium of the foregoing embodiment stores computer instructions for causing the computer to execute the laser single longitudinal mode output method based on the asymmetric saturation absorber according to any one of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present disclosure, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present disclosure. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present disclosure, and this also accounts for the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present disclosure are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.
Claims (10)
1. A laser based on an asymmetric saturated absorber, comprising:
a pump laser configured to pump the emitted laser light;
the integrator comprises a first port, a second port, a third port and a fourth port, wherein the first port of the integrator is connected with the output end of the pump laser and is configured to collect and reflect the laser;
the gain fiber is connected with the second port of the integrator and is configured to receive the laser reflected by the integrator and perform stimulated radiation to obtain initial second laser;
a first circulator having a first port connected to the gain fiber and configured to control unidirectional operation of the initial second laser within the laser main cavity, wherein the unidirectional operation is in a direction from the first port of the first circulator to the second port of the first circulator to the third port of the first circulator;
the uniform Bragg grating is connected with the second port of the first circulator and is configured to filter the initial second laser to obtain second laser;
and one end of the asymmetric saturated absorber is connected with the third port of the first circulator, the other end of the asymmetric saturated absorber is connected with the third port of the integrator, the asymmetric saturated absorber is configured to filter the second laser to obtain third laser, the third laser is sent to the third port of the integrator, and the third laser is output through the third port of the integrator.
2. The power asymmetric saturated absorber based laser of claim 1, wherein the asymmetric saturated absorber includes an optical coupler, a second circulator and an unpumped erbium doped fiber;
the first port of the optical coupler is connected with the third port of the first circulator and is configured to divide the second laser to obtain a first sub-laser and a second sub-laser;
a second circulator, a first port of the second circulator being connected to a second port of the optical coupler, a third port of the second circulator being connected to a third port of the integrator, configured to control unidirectional operation of the laser within the laser main cavity, wherein the unidirectional operation is in a direction from the first port of the second circulator to the second port of the second circulator to the third port of the second circulator;
and one end of the unpumped erbium-doped optical fiber is connected with the third port of the optical coupler, and the other end of the unpumped erbium-doped optical fiber is connected with the second port of the second circulator and is configured to receive the first sub-laser and the second sub-laser and perform standing wave interference to obtain third laser.
3. The method as recited in claim 1, further comprising:
and the temperature controller is wrapped outside the uniform Bragg grating, connected with the uniform Bragg grating and configured to control the temperature of the uniform Bragg grating.
4. The power asymmetric saturated absorber based laser of claim 2, wherein the optical coupler is a standard single mode fiber coupler with a splitting ratio that is a preset splitting ratio.
5. The power asymmetric saturated absorber based laser of claim 1, wherein the pump laser is a 980nm pump laser.
6. The power asymmetric saturated absorber based laser of claim 1, wherein the integrator is a 980/1550nm integrator.
7. The power asymmetric saturated absorber based laser of claim 1, wherein the gain fiber is an erbium doped fiber with a high doping concentration.
8. The power asymmetric saturated absorber based laser of claim 2, wherein the unpumped erbium doped fiber is an erbium doped fiber with a low doping concentration.
9. The laser single longitudinal mode output method based on the asymmetric saturated absorber is characterized by comprising the following steps of:
acquiring first laser emitted by a pumping laser, wherein the first laser comprises at least one laser with a wavelength;
filtering the first laser through a uniform Bragg grating to obtain second laser;
injecting the second laser into an optical coupler, and dividing the second laser by using the optical coupler to obtain a first sub-laser and a second sub-laser;
the first sub-laser is sent to an unpumped erbium-doped fiber, and the second sub-laser is reversely sent to the unpumped erbium-doped fiber by using a second circulator;
the first sub-laser and the second sub-laser utilize the unpumped erbium-doped fiber to perform standing wave interference to obtain third laser, wherein the third laser is laser with the same wavelength;
and outputting the third laser through the integrator.
10. The method of claim 9, wherein the filtering the first laser light with a uniform bragg grating to obtain a second laser light comprises:
injecting the first laser into an integrator;
carrying out reflection treatment by the integrator, and injecting the reflected first laser into a gain fiber;
stimulated radiation is carried out on the reflected first laser by utilizing the gain optical fiber, so that initial second laser is obtained;
and sending the initial second laser to a uniform Bragg grating by using a first circulator, and filtering by using the uniform Bragg grating to obtain the second laser.
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