CN101013791A - Ring tunable single-frequency single-polarization fiber laser - Google Patents
Ring tunable single-frequency single-polarization fiber laser Download PDFInfo
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- CN101013791A CN101013791A CN 200710063559 CN200710063559A CN101013791A CN 101013791 A CN101013791 A CN 101013791A CN 200710063559 CN200710063559 CN 200710063559 CN 200710063559 A CN200710063559 A CN 200710063559A CN 101013791 A CN101013791 A CN 101013791A
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Abstract
The invention relates to one ring attuning single frequency bias fiber laser, which comprises fiber comb reflector, fiber comb filter, rare earth mixture fiber, 2X2 fiber coupler, first fiber isolator, second one and laser output end, wherein, it uses fiber comb reflector to provide light feedback and the fiber comb filter is to extract inside filter; the fiber comb reflector and filter has at least one bias and attuning one.
Description
Technical field
The present invention relates to a kind of tunable optical fiber laser, particularly by the wide range of wavelengths tunable single-frequency single polarization optical fiber laser of pectination reflector and comb filter and rare earth-doped fiber looping laserresonator.
Background technology
Wide range of wavelengths tunable single-frequency single polarization laser has broad application prospects at big capacity long-distance optical fiber communication system, optical fiber and opto-electronic device and fields such as systematic survey and Fibre Optical Sensor.Especially optical-fiber type laser because it mates fully with fibre system, does not have the optical coupling problem, compares the advantage with uniqueness with traditional semiconductor laser.Be used at present realize that the fiber laser technology scheme of the single polarization laser output of tunable wave length single-frequency mainly contains: (a) on several specific wavelengths, provide the light feedback by a plurality of fiber gratings, tunable filter is realized tunable laser output (IEEE PhotonicsTechnology Letters in the binding cavity, 17 (7), pp.1387-1389,2005); (b) provide the light feedback with tunable fiber grating, adopt fibre optic polarizer to carry out polarization state control (patent of invention, application number: 200310122025.0) in the chamber; (c) provide the light feedback by tunable fiber grating, realize tunable laser output (utility model patent, application number: 03277023.5) in conjunction with intraluminal filter; (d) in annular chamber, add tunable optic filter and fibre optic polarizer realization tunable single-frequency single polarization laser output (IEEE Photonics Technology Letters, 2 (11), pp.787-789,1990) etc. on a large scale.Wherein (a) described laser can only be realized the switching of optical maser wavelength on pairing a few wavelength of fiber grating.(b) and (c) then be subjected to the restriction of fiber grating tuning scope, only can be implemented in the wavelength tuning on several nanometers.(d) though the wide range of wavelengths that can be implemented in the whole gain spectral is tuning, the manufacture difficulty of tunable narrow-band filter itself and cost are all very high on a large scale, have limited the development of this tunable optical fiber laser.
Summary of the invention
The technical problem to be solved in the present invention is at the existing the problems referred to above in tunable single-frequency single polarization optical fiber laser field, provides that a kind of wide range of wavelengths is tunable, technology is simple, with low cost, stable performance and be easy to the single polarization circular cavity optic fibre laser of single-frequency of suitability for industrialized production.
Technical scheme of the present invention is that this laser comprises: optical-fiber type pectination reflector, optical-fiber type comb filter, rare-earth doped optical fibre, 2 * 2 fiber couplers, semiconductor laser, wavelength division multiplexer, first fibre optic isolater, second fibre optic isolater and laser output; Provide the light feedback with optical-fiber type pectination reflector, provide filtering in the chamber with the optical-fiber type comb filter simultaneously, in the middle of optical-fiber type pectination reflector and optical-fiber type comb filter, have at least one to be that polarization is relevant, and have at least one to be tunable: by the reflection peak position of tunable fiber type pectination reflector, or the transmission peaks position of tunable fiber type pectination reflector, or optical-fiber type pectination reflector and filter are united tuning, realize the output of tunable single-frequency single polarization laser.Described optical-fiber type pectination reflector is meant the optical fibre device with fixing or tunable multi-wavelength pectination reflectance spectrum, and described optical-fiber type comb filter is meant the optical fibre device with fixing or tunable multi-wavelength pectination transmission spectrum.The reflectance spectrum of optical-fiber type pectination reflector has different peak wavelengths at interval with the transmission spectrum of optical-fiber type comb filter.
Connected mode between each parts of annular chamber single-frequency single-polarization fiber laser of being invented is: semiconductor laser links to each other with the pump light input of wavelength division multiplexer, the output of wavelength division multiplexer links to each other with the input of first fibre optic isolater, be connected in series with rare-earth doped optical fibre and optical-fiber type comb filter in proper order again, the input of the output of optical-fiber type comb filter and second fibre optic isolater joins, the output of second fibre optic isolater is connected with an arm of 2 * 2 fiber couplers, another arm of coupler homonymy links to each other with the flashlight input of wavelength division multiplexer, the looping cavity configuration, the reflection end of one arm of 2 * 2 fiber coupler opposite sides and optical-fiber type pectination reflector joins, and all the other arms are laser output.By tuning pectination reflector or comb filter, or the two is united tuning, make for specific linearly polarized light, the a certain reflection peak that obtains the wavelength location upper comb shape reflector of laser output in hope overlaps with a certain transmission peaks of comb filter, and all do not overlap with the transmission peaks of comb filter, thereby on this wavelength, obtain the single polarization laser output of single-frequency at the reflection peak of other wavelength upper comb shape reflector.When its distinguishing feature is to adopt optical-fiber type pectination reflector that the light feedback is provided, in the chamber, adopt the optical-fiber type comb filter to carry out filtering, therefore, only need regulate among a small circle and can realize the tuning of laser output wavelength on a large scale the spectrum of pectination reflector or comb filter, greatly reduce the manufacture difficulty and the cost of manufacture of device, be easy to carry out suitability for industrialized production.
Described optical-fiber type pectination reflector is: (a) optical-fiber type Fabry Perot pectination reflector, (b) the tunable pectination reflector of optical-fiber type Fabry Perot, (c) the sampling optical-fiber grating pectination reflector of on ordinary optic fibre, making, (d) the polarization coherent sampling fiber grating pectination reflector of on birefringence fiber, making, (e) the tunable pectination reflector of sampling optical-fiber grating, (f) the ring-like pectination reflector of high birefringence optical fiber Sagnac, (g) the ring-like tunable pectination reflector of high birefringence optical fiber Sagnac, (h) optical fiber michelson interferometer type pectination reflector or (i) reflection end of optical-fiber type pectination reflector and the fibre optic polarizer polarization associated fiber type pectination reflector that joins and constitute; Described optical-fiber type comb filter is: (a) optical-fiber type Fabry Perot comb filter, (b) the tunable comb filter of optical-fiber type Fabry Perot, (c) the optical-fiber type comb filter that constitutes by optical fiber circulator and the sampling optical-fiber grating of on ordinary optic fibre, making, (d) the polarization associated fiber type comb filter that constitutes by optical fiber circulator and the polarization coherent sampling fiber grating of on birefringence fiber, making, (e) the optical-fiber type comb filter that constitutes by optical fiber circulator and sampling optical-fiber grating, (f) the ring-like comb filter of high birefringence optical fiber Sagnac, (g) the ring-like tunable comb filter of optical fiber Sagnac, (h) optical fiber mach-Ceng Deer interferometer type comb filter or the polarization associated fiber type comb filter of (i) joining and constituting by optical-fiber type comb filter and fibre optic polarizer.
Compare the beneficial effect that the present invention has with the prior art scheme: device architecture is simple, be easy to make, with low cost, can in the whole gain spectral scope of rare-earth doped optical fibre, obtain stable tunable single-frequency single polarization laser and export.
Description of drawings
Fig. 1 ring tunable single-frequency single-polarization fiber laser basic composition structure chart
The embodiment one of Fig. 2 ring tunable single-frequency single-polarization fiber laser
The embodiment two of Fig. 3 ring tunable single-frequency single-polarization fiber laser
The embodiment three of Fig. 4 ring tunable single-frequency single-polarization fiber laser
The reflectance spectrum (heavy line) of ring-like comb filter transmission spectrum of Fig. 5 optical fiber Sagnac (fine line) and the ring-like tunable pectination reflector of optical fiber Sagnac
The output spectra of the tunable optical fiber laser that Fig. 6 is made up of ring-like tunable pectination reflector of optical fiber Sagnac and the ring-like comb filter of optical fiber Sagnac
Wherein: 1. optical-fiber type pectination reflector; 2. optical-fiber type comb filter; 3. rare-earth doped optical fibre; 4.2 * 2 fiber couplers; 5. semiconductor laser; 6. wavelength division multiplexer; 7. first fibre optic isolater, 8. second fibre optic isolater; 9. laser output.
Embodiment
Fig. 2, Fig. 3 and Fig. 4 are three kinds of embodiments of the present invention.
Execution mode one is seen Fig. 2.
Optical-fiber type pectination reflector 1 is selected the ring-like polarization of the high birefringence optical fiber Sagnac tunable pectination reflector of being correlated with for use, and optical-fiber type comb filter 2 is selected the ring-like comb filter of high birefringence optical fiber Sagnac of untunable and polarization irrelevant for use; The connected mode of the ring tunable single-frequency single-polarization fiber laser that is constituted: semiconductor laser 5 links to each other with the pump light input of wavelength division multiplexer 6, the output of wavelength division multiplexer 6 links to each other with the input of first fibre optic isolater 7, be connected in series with rare-earth doped optical fibre 3 and the ring-like comb filter 2 of high birefringence optical fiber Sagnac in proper order again, the output of the ring-like comb filter 2 of high birefringence optical fiber Sagnac and the input of second fibre optic isolater 8 join, the output of second fibre optic isolater 8 is connected with an arm of 2 * 2 fiber couplers 4, another arm of 2 * 2 fiber couplers, 4 homonymies links to each other with the flashlight input of wavelength division multiplexer 6, the looping cavity configuration, one arm of 2 * 2 fiber couplers, 4 opposite sides joins with the reflection end of the relevant tunable pectination reflector 1 of the ring-like polarization of high birefringence optical fiber Sagnac, and all the other arms are laser output 9.
Execution mode two is seen Fig. 3.The ring tunable single-frequency single-polarization fiber laser that is constituted with the difference of execution mode one is: optical-fiber type pectination reflector 1 is selected the relevant tunable sampling optical-fiber grating pectination reflector of the polarization of making for use on birefringence fiber, optical-fiber type comb filter 2 is still selected the ring-like comb filter of high birefringence optical fiber Sagnac of untunable and polarization irrelevant for use.
Execution mode three is seen Fig. 4.The difference of ring tunable single-frequency single-polarization fiber laser that is constituted and execution mode one is: optical-fiber type pectination reflector 1 is selected non-tunable polarization coherent sampling fiber grating pectination reflector of making for use on birefringence fiber, optical-fiber type comb filter 2 is selected the tunable comb filter of optical-fiber type Fabry Perot polarization irrelevant for use.
Ring tunable single-frequency single-polarization fiber laser with execution mode one is that example realizes that to the present invention the detailed process of tunable single-frequency single polarization laser output is described further below.Rare-earth doped optical fibre in the laser is an Er-doped fiber.Figure 5 shows that the transmission spectrum (fine line) of the ring-like comb filter of high birefringence optical fiber Sagnac and the reflectance spectrum (heavy line) of the relevant tunable pectination reflector of the ring-like polarization of high birefringence optical fiber Sagnac after tuning, at the 1549.2nm place, the reflection peak of pectination reflector overlaps with the transmission peaks of comb filter, and therefore laser has minimum cavity loss and laser threshold on this wavelength.Because the competition between the zlasing mode, the optical mode on other wavelength all is suppressed, thereby obtains single-frequency laser output.Fig. 6 is and the pairing laser output spectra of the reflectance spectrum of Fig. 5.Making the transmission spectrum of its reflectance spectrum and the ring-like comb filter of high birefringence optical fiber Sagnac peak value occur on other wavelength by the ring-like tunable pectination reflector of tuning polarization associated fiber Sagnac overlaps, laser will obtain laser output on this wavelength location, realize the tuning of optical maser wavelength.
Claims (2)
1. ring tunable single-frequency single-polarization fiber laser, this laser comprises: optical-fiber type reflector, optical-fiber type filter, rare-earth doped optical fibre, 2 * 2 fiber couplers, semiconductor laser, wavelength division multiplexer, first fibre optic isolater, second fibre optic isolater, laser output; It is characterized in that: described optical-fiber type reflector is an optical-fiber type pectination reflector (1), and described optical-fiber type filter is optical-fiber type comb filter (2); In the middle of optical-fiber type pectination reflector (1) and optical-fiber type comb filter (2), have at least one to be that polarization is relevant, and have at least one to be tunable; By the reflection peak position of tunable fiber type pectination reflector, or the transmission peaks position of tunable fiber type comb filter, or optical-fiber type pectination reflector and filter are united tuning, realize the output of tunable single-frequency single polarization laser.
2. tunable single-frequency single polarization circular cavity optic fibre laser according to claim 1 is characterized in that: described optical-fiber type pectination reflector (1) is: (a) optical-fiber type Fabry Perot pectination reflector, (b) the tunable pectination reflector of optical-fiber type Fabry Perot, (c) the sampling optical-fiber grating pectination reflector of on ordinary optic fibre, making, (d) the polarization coherent sampling fiber grating pectination reflector of on birefringence fiber, making, (e) the tunable pectination reflector of sampling optical-fiber grating, (f) the ring-like pectination reflector of high birefringence optical fiber Sagnac, (g) the ring-like tunable pectination reflector of high birefringence optical fiber Sagnac, (h) optical fiber michelson interferometer type pectination reflector or (i) reflection end of optical-fiber type pectination reflector and the fibre optic polarizer polarization associated fiber type pectination reflector that joins and constitute; Described optical-fiber type comb filter (2) is: (a) optical-fiber type Fabry Perot comb filter, (b) the tunable comb filter of optical-fiber type Fabry Perot, (c) the optical-fiber type comb filter that constitutes by optical fiber circulator and the sampling optical-fiber grating of on ordinary optic fibre, making, (d) the optical-fiber type comb filter that constitutes by optical fiber circulator and the polarization coherent sampling fiber grating of on birefringence fiber, making, (e) the tunable fiber type comb filter that constitutes by optical fiber circulator and sampling optical-fiber grating, (f) the ring-like comb filter of high birefringence optical fiber Sagnac, (g) the ring-like tunable comb filter of high birefringence optical fiber Sagnac, (h) optical fiber mach-Ceng Deer interferometer type comb filter, (i) by optical-fiber type comb filter and fibre optic polarizer join polarization associated fiber type comb filter that constitutes or the tunable comb filter of polarization associated fiber type of (j) joining and constituting by optical fiber type tunable comb filter and fibre optic polarizer.
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