CN116979346A - Dual-wavelength single-frequency fiber laser - Google Patents
Dual-wavelength single-frequency fiber laser Download PDFInfo
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- CN116979346A CN116979346A CN202311063664.8A CN202311063664A CN116979346A CN 116979346 A CN116979346 A CN 116979346A CN 202311063664 A CN202311063664 A CN 202311063664A CN 116979346 A CN116979346 A CN 116979346A
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- 239000000835 fiber Substances 0.000 title claims abstract description 122
- 239000013307 optical fiber Substances 0.000 claims abstract description 105
- 238000002310 reflectometry Methods 0.000 claims abstract description 90
- 238000010521 absorption reaction Methods 0.000 claims abstract description 18
- 230000009977 dual effect Effects 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims description 7
- 238000005253 cladding Methods 0.000 description 5
- 230000001427 coherent effect Effects 0.000 description 2
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- -1 rare earth ions Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- 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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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses a dual-wavelength single-frequency fiber laser, which comprises: the pumping source pumps the first active optical fiber through the filter type wavelength division multiplexer, the first high-reflectivity fiber grating is written on the first active optical fiber, the other end of the first active optical fiber is connected with the second low-reflectivity fiber grating, one end of the second active optical fiber is connected with the reflection port of the wavelength division multiplexer, the other end of the second active optical fiber is connected with the first low-reflectivity fiber grating, and the second high-reflectivity fiber grating is written on the second active optical fiber. The first and second active optical fibers are utilized to have absorption and emission sections at two laser wavelengths to form dual-wavelength single-frequency laser. The dual-wavelength single-frequency fiber laser can select laser wavelength according to application requirements, and the problems of poor power stability and the like caused by limited wavelength interval and gain competition between dual wavelengths of the traditional dual-wavelength single-frequency fiber laser are solved.
Description
Technical Field
The invention relates to the field of lasers, in particular to a dual-wavelength single-frequency fiber laser.
Background
The single-frequency fiber laser has excellent performances such as narrow linewidth, low noise and the like, has important application value in the field of long-distance coherent detection, and in recent years, the dual-wavelength single-frequency fiber laser has wide application prospect in the fields of coherent optical communication, distributed fiber sensing, high-resolution spectrum analysis and the like.
At present, the main technical approaches for realizing the dual-wavelength single-frequency fiber laser include a linear Distributed Bragg Reflection (DBR) structure based on the birefringence effect of a polarization maintaining fiber grating, and a combination of a dual-wavelength selection device and a narrow-band filter device in an annular cavity, but both have certain defects in practical application. First, a linear short cavity structure [1] The generation of dual-wavelength laser is highly dependent on the dual-reflection wavelength of polarization-maintaining fiber grating, resulting in extremely limited wavelength spacing (generally smaller than that of the dual-wavelength single-frequency laser based on the technical scheme)<0.5 nm), and the laser gain competition is serious due to the smaller dual wavelength interval, and the laser power stability at two wavelengths is poor; and for annular cavity structures [2,3] Although the selection of the two laser wavelengths in a certain range is realized by adopting a wavelength selection device such as a fiber grating, an interference filter and the like, the longer cavity length of the annular cavity laser leads to poor single longitudinal mode stability of the dual-wavelength laser. More importantly, because the current dual-wavelength single-frequency fiber laser mainly utilizes a single gain medium and the filtering capability of the wavelength selection device is limited, the dual-wavelength single-frequency laser still has a plurality of bottlenecks in the aspects of specific working wavelength, wavelength interval selection and the like, and the requirements in practical application are difficult to meet. Reference is made to:
Y.Hou,Q.Zhang,S.Qi,X.Feng,and P.Wang,"1.5μm polarization-maintaining dual-wavelength single-frequency distributed Bragg reflection fiber laser with 28GHz stable frequency difference,"Optics Letters,43(6),1383-1386(2018)
R.K.Kim,S.Chu,and Y.G.Han,"Stable and widely tunable single-longitudinal-mode dual-wavelength Erbium-doped fiber laser for optical beat frequency generation,"IEEE Photonics Technology Letters,24(6),521-523(2012).
guo Yubin, sun Tiegang, wang Tianshu, huo Jiayu, zhang Le, "dual wavelength annular cavity single frequency fiber laser", patent No. CN103515836B.
Disclosure of Invention
The invention provides a dual-wavelength single-frequency optical fiber laser, which can realize ultra-narrow band filtering for another laser while realizing active optical fiber as a gain medium by special selection of a dual-wavelength laser gain medium and unique design of a laser cavity structure, thereby realizing dual-wavelength single-frequency laser output, effectively solving the development bottleneck of the dual-wavelength single-frequency optical fiber laser in the aspects of specific working wavelength and wavelength interval selection, greatly improving the laser power of the dual-wavelength single-frequency optical fiber laser, expanding the working wavelength range, wavelength interval and other performances of the laser, and being described in detail below:
a dual wavelength single frequency fiber laser, the laser comprising: the system comprises a pumping source, a filtering type wavelength division multiplexer, a first active optical fiber, a second active optical fiber, a first high-reflectivity fiber grating, a first low-reflectivity fiber grating, a second high-reflectivity fiber grating and a second low-reflectivity fiber grating;
the pump source pumps the first active optical fiber through a filter type wavelength division multiplexer, the first high-reflectivity fiber grating is written on the first active optical fiber, the other end of the first active optical fiber is connected with the second low-reflectivity fiber grating, one end of the second active optical fiber is connected with a reflection port of the filter type wavelength division multiplexer, the other end of the second active optical fiber is connected with the first low-reflectivity fiber grating, and the second high-reflectivity fiber grating is written on the second active optical fiber;
the central reflection wavelength of the first high-reflectivity fiber grating and the first low-reflectivity fiber grating is positioned at the first laser wavelength of the dual-wavelength single-frequency fiber laser; the central reflection wavelength of the second high-reflectivity fiber bragg grating and the second low-reflectivity fiber bragg grating is positioned at the second laser wavelength of the dual-wavelength single-frequency fiber laser;
the first active optical fiber has a transmitting section at a first laser wavelength and an absorbing section at a second laser wavelength; the second active fiber has an emission cross-section at the second laser wavelength and an absorption cross-section at the first laser wavelength.
The first active optical fiber is divided into two parts by the first high-reflectivity fiber bragg grating, the connecting part of the first active optical fiber and the filter type wavelength division multiplexer is used as a gain medium of a first laser wavelength, and the connecting part of the first active optical fiber and the second low-reflectivity fiber bragg grating forms an ultra-narrow band filter grating aiming at a second laser wavelength.
The second active optical fiber is divided into two parts by the second high-reflectivity fiber bragg grating, the connecting part of the second active optical fiber and the filter type wavelength division multiplexer is used as a gain medium of a second laser wavelength, and the connecting part of the second active optical fiber and the first low-reflectivity fiber bragg grating forms an ultra-narrow band filter grating aiming at the first laser wavelength.
Further, the pump power of the pump source is distributed in the first active optical fiber between the filter-type wavelength division multiplexer and the first high-reflectivity fiber grating.
The filter type wavelength division multiplexer is replaced by a pump/signal beam combiner according to the laser power level. The wavelength of the pump source is the pump absorption wavelength of the first laser wavelength generated by the first active optical fiber.
The technical scheme provided by the invention has the beneficial effects that:
1) The invention adopts two-band active optical fibers with emission section characteristics to the laser wavelength to construct the laser resonant cavity, thereby realizing the generation of dual-wavelength laser and effectively solving the limitations of specific working wavelength and dual-wavelength spacing of the dual-wavelength single-frequency optical fiber laser;
2) The invention utilizes the active optical fiber to provide the gain of the dual-wavelength laser and further utilizes the absorption section characteristic of the active optical fiber to respectively conduct targeted narrow-band filtering on the dual-wavelength laser, thereby realizing the single longitudinal mode operation of the dual-wavelength laser;
3) Compared with the linear short-cavity dual-wavelength single-frequency optical fiber laser, the linear short-cavity dual-wavelength single-frequency optical fiber laser has the problems of insufficient gain, complex structure of an annular cavity structure, larger device loss and the like.
Drawings
Fig. 1 is a schematic structural diagram of a dual-wavelength single-frequency fiber laser according to the present invention.
In fig. 1, the components denoted by the reference numerals are as follows:
1: a pump source; 2: a filtering type wavelength division multiplexer;
3: a first active optical fiber; 4: a first high reflectivity fiber grating;
5: a first low reflectivity fiber grating; 6: a second active optical fiber;
7: a second high reflectivity fiber grating; 8: and a second low reflectivity fiber grating.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
Example 1
The embodiment of the invention provides a 1750nm and 1950nm dual-wavelength single-frequency optical fiber laser, which comprises: the optical fiber comprises a pump source 1, a filter type wavelength division multiplexer 2, a first active optical fiber 3, a first high-reflectivity fiber grating 4, a first low-reflectivity fiber grating 5, a second active optical fiber 6, a second high-reflectivity fiber grating 7 and a second low-reflectivity fiber grating 8.
The pump source 1 is a single-mode fiber laser, and the wavelength is in the range of 1530-1580 nm; the working wavelength of the filter type wavelength division multiplexer 2 is 1530-1580 nm/1800-2100 nm, wherein the port of 1530-1580 nm is a transmission port, and the port of 1800-2100 nm is a reflection port; the first active optical fiber 3 is a single-cladding thulium-doped optical fiber, the absorption coefficient at 1570nm is 7dB/m, and the optical fiber length is 14m; the first high-reflectivity fiber bragg grating 4 is written in the position 6m away from one end of the first active optical fiber 3 connected with the filter type wavelength division multiplexer 2, the center wavelength of the grating is 1750nm, the reflectivity is more than 99%, and the 3-dB bandwidth is 0.3nm; the central wavelength of the first low-reflectivity fiber bragg grating 5 is 1750nm, the reflectivity is 50%, and the 3-dB bandwidth is 0.05nm; the second active optical fiber 6 has the same parameters as the first active optical fiber 3, and the optical fiber length is 12m; the second high-reflectivity fiber bragg grating 7 is written in the position, which is 5m away from one end of the second active optical fiber 6 and connected with the filter-type wavelength division multiplexer 2, of the center wavelength of the grating is 1950nm, the reflectivity is more than 99%, and the 3-dB bandwidth is 0.3nm; the second low-reflectivity fiber grating 8 has a center wavelength of 1950nm, a reflectivity of 35% and a 3-dB bandwidth of 0.05nm.
In particular, the pump power level is controlled according to the absorption coefficient of the first active optical fiber 3 to the pump light, so that the pump light is only distributed between the first high-reflectivity fiber bragg grating 4 and the filter type wavelength division multiplexer 2. The 1750nm laser resonant cavity is formed by the first high-reflectivity fiber bragg grating 4, part of the first active fiber 3, the second active fiber optic 6 and the first low-reflectivity fiber bragg grating 5, and the single-frequency output of 1750nm laser is realized by combining an ultra-narrow band filter grating formed in the second active fiber optic 6 between the first low-reflectivity fiber bragg grating 5 and the second high-reflectivity fiber bragg grating 7. The 1750nm laser is used as pump light, a second active optical fiber 6 positioned between a second high-reflectivity optical fiber grating 7 and the filter type wavelength division multiplexer 2 is pumped, the second high-reflectivity optical fiber grating 7, part of the second active optical fiber 6, the first active optical fiber 3 and the second low-reflectivity optical fiber grating 8 form a 1950nm laser resonant cavity, and single-frequency output of 1950nm laser is realized by combining an ultra-narrow band filter grating formed in the second active optical fiber 3 between the first high-reflectivity optical fiber grating 4 and the second low-reflectivity optical fiber grating 8.
Wherein, for the first active optical fiber 3, according to the absorption coefficient of the first active optical fiber 3 to the pump source 1, the absorption of the first active optical fiber 3 to the pump light forming part of the resonant cavity of the laser wavelength 1 should satisfy >20dB, so as to determine the writing position of the first high-reflectivity fiber grating 4. "part of the first active optical fiber 3" means a portion between the first high-reflectivity fiber grating 4 and the filtering type wavelength division multiplexer 2. Similarly, according to the absorption coefficient of the second active optical fiber 6 to the laser wavelength 1, the absorption of the second active optical fiber 6 to the laser wavelength 1, which forms part of the resonant cavity of the laser wavelength 2, should satisfy >20dB, so as to determine the writing position of the second high-reflectivity fiber grating 7. "part of the second active optical fiber 6" refers to the part between the second high-reflectivity fiber grating 7 and the filter-type wavelength division multiplexer 2.
In a specific implementation, the first active optical fiber 3 and the second active optical fiber 6 are single cladding thulium doped optical fibers, that is, the first active optical fiber 3 has a transmitting section at a first laser wavelength (1750 nm) and an absorbing section at a second laser wavelength (1950 nm); the second active fiber 6 has an emission cross-section at the second laser wavelength (1950 nm) and an absorption cross-section at the first laser wavelength (1750 nm). Thereby ensuring that the embodiment of the invention can realize 1750nm and 1950nm dual-wavelength single-frequency fiber lasers. The absorption and emission cross section characteristics of the active optical fiber are known in the laser field, and the embodiments of the present invention are not described herein.
In summary, the embodiment of the invention has the advantages that although a single gain medium is adopted, two laser resonant cavities are respectively built by utilizing the wide emission spectrum characteristics of rare earth ions in a glass matrix, and narrow-band filters aiming at two laser wavelengths are respectively built by utilizing the wide absorption spectrum characteristics of an active optical fiber on the basis, so that the output of dual-wavelength single-frequency optical fiber laser is realized, and the problems of poor power stability caused by the relatively close working wavelength interval and relatively serious gain competition between dual-wavelength lasers of the traditional dual-wavelength single-frequency optical fiber laser are effectively solved.
Example 2
The embodiment of the invention provides a 1900nm and 2000nm dual-wavelength single-frequency optical fiber laser, which comprises: the optical fiber comprises a pump source 1, a filter type wavelength division multiplexer 2, a first active optical fiber 3, a first high-reflectivity fiber grating 4, a first low-reflectivity fiber grating 5, a second active optical fiber 6, a second high-reflectivity fiber grating 7 and a second low-reflectivity fiber grating 8.
The pump source 1 is a multimode semiconductor laser, and the wavelength is 793nm; the filter type wavelength division multiplexer 2 is a (1+1) multiplied by 1 pump signal beam combiner with the working wavelength of 793 nm/1800-2100 nm; the first active optical fiber 3 is a double-cladding thulium-doped optical fiber, the cladding absorption coefficient at 793nm is 9dB/m, and the optical fiber length is 12m; the first high-reflectivity fiber bragg grating 4 is written in a position 4m away from one end of the first active optical fiber 3, which is connected with the filter-type wavelength division multiplexer 2, the central wavelength of the grating is 1900nm, the reflectivity is more than 99%, and the 3-dB bandwidth is 0.3nm; the center wavelength of the first low-reflectivity fiber bragg grating 5 is 1900nm, the reflectivity is 50%, and the 3-dB bandwidth is 0.05nm; the second active optical fiber 6 is a double-cladding holmium-doped optical fiber, the absorption coefficient of a fiber core at 1900nm is 4dB/m, and the length of the optical fiber is 12m; the second high-reflectivity fiber bragg grating 7 is written in the position 5m away from one end of the second active optical fiber 6 connected with the filter-type wavelength division multiplexer 2, the grating center wavelength is 2000nm, the reflectivity is more than 99%, and the 3-dB bandwidth is 0.3nm; the second low-reflectivity fiber bragg grating 8 has a center wavelength of 2000nm, a reflectivity of 65% and a 3-dB bandwidth of 0.05nm.
In particular, the pump power level is controlled according to the absorption coefficient of the first active optical fiber 3 to the pump light, so that the pump light is only distributed between the first high-reflectivity fiber bragg grating 4 and the filter type wavelength division multiplexer 2. The 1900nm laser resonant cavity is formed by the first high-reflectivity fiber bragg grating 4, part of the first active fiber 3, the second active fiber bragg grating 6 and the first low-reflectivity fiber bragg grating 5, and the 1900nm laser single-frequency output is realized by combining the ultra-narrow band filter grating formed in the second active fiber bragg grating 6 between the first low-reflectivity fiber bragg grating 5 and the second high-reflectivity fiber bragg grating 7. The 1900nm laser is used as pump light, the fiber core pumps a second active optical fiber 6 positioned between a second high-reflectivity fiber grating 7 and the filter type wavelength division multiplexer 2, the second high-reflectivity fiber grating 7, part of the second active optical fiber 6, the first active optical fiber 3 and a second low-reflectivity fiber grating 8 form a 2000nm laser resonant cavity, and the ultra-narrow band filter grating formed in the first active optical fiber 3 between the first high-reflectivity fiber grating 4 and the second low-reflectivity fiber grating 8 is combined to realize the single-frequency output of 2000nm laser.
In specific implementation, the first active optical fiber 3 is a double-clad thulium-doped optical fiber, and the second active optical fiber 6 is a double-clad holmium-doped optical fiber, that is, the first active optical fiber 3 has a transmitting section at a first laser wavelength (1900 nm) and an absorbing section at a second laser wavelength (2000 nm); the second active optical fiber 6 has an emission cross-section at the second laser wavelength (2000 nm) and an absorption cross-section at the first laser wavelength (1900 nm). Thereby ensuring that the embodiment of the invention can realize 1900nm and 2000nm dual-wavelength single-frequency fiber lasers.
In summary, the embodiment of the invention has the advantage of solving the problems of difficult expansion of the working wavelength interval of the dual-wavelength laser, serious gain competition among the dual-wavelength lasers and poor stability of the respective power caused by the single gain medium of the traditional dual-wavelength single-frequency fiber laser.
The embodiment of the invention does not limit the types of other devices except the types of the devices, so long as the devices can complete the functions.
Those skilled in the art will appreciate that the drawings are schematic representations of only one preferred embodiment, and that the above-described embodiment numbers are merely for illustration purposes and do not represent advantages or disadvantages of the embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A dual wavelength single frequency fiber laser, the laser comprising: the system comprises a pumping source, a filtering type wavelength division multiplexer, a first active optical fiber, a second active optical fiber, a first high-reflectivity fiber grating, a first low-reflectivity fiber grating, a second high-reflectivity fiber grating and a second low-reflectivity fiber grating;
the pump source pumps the first active optical fiber through a filter type wavelength division multiplexer, the first high-reflectivity fiber grating is written on the first active optical fiber, the other end of the first active optical fiber is connected with the second low-reflectivity fiber grating, one end of the second active optical fiber is connected with a reflection port of the filter type wavelength division multiplexer, the other end of the second active optical fiber is connected with the first low-reflectivity fiber grating, and the second high-reflectivity fiber grating is written on the second active optical fiber;
the central reflection wavelength of the first high-reflectivity fiber grating and the first low-reflectivity fiber grating is positioned at the first laser wavelength of the dual-wavelength single-frequency fiber laser; the central reflection wavelength of the second high-reflectivity fiber bragg grating and the second low-reflectivity fiber bragg grating is positioned at the second laser wavelength of the dual-wavelength single-frequency fiber laser;
the first active optical fiber has a transmitting section at a first laser wavelength and an absorbing section at a second laser wavelength; the second active fiber has an emission cross-section at the second laser wavelength and an absorption cross-section at the first laser wavelength.
2. The dual wavelength single frequency fiber laser of claim 1, wherein the first active fiber is divided into two parts by the first high reflectivity fiber grating, the part connected to the filter wavelength division multiplexer is used as a gain medium of the first laser wavelength, and the part connected to the second low reflectivity fiber grating forms an ultra-narrow band filter grating for the second laser wavelength.
3. The dual wavelength single frequency fiber laser of claim 1, wherein the second active fiber is divided into two parts by the second high reflectivity fiber grating, the part connected to the filter wavelength division multiplexer is used as a gain medium of the second laser wavelength, and the part connected to the first low reflectivity fiber grating forms an ultra-narrow band filter grating for the first laser wavelength.
4. The dual wavelength single frequency fiber laser of claim 1, wherein the pump power of the pump source is distributed in the first active fiber between the filtered wavelength division multiplexer and the first high reflectivity fiber grating.
5. The dual wavelength single frequency fiber laser of claim 1 wherein said filtered wavelength division multiplexer is replaced with a pump/signal combiner based on laser power level.
6. The dual wavelength single frequency fiber laser of claim 1 wherein the pump source has a wavelength that is a pump absorption wavelength of the first active fiber that produces a first laser wavelength.
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