CN100481657C - Realization method of linetype cavity single polarization dual wavelength optical fiber grating laser - Google Patents
Realization method of linetype cavity single polarization dual wavelength optical fiber grating laser Download PDFInfo
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- CN100481657C CN100481657C CNB2007101761692A CN200710176169A CN100481657C CN 100481657 C CN100481657 C CN 100481657C CN B2007101761692 A CNB2007101761692 A CN B2007101761692A CN 200710176169 A CN200710176169 A CN 200710176169A CN 100481657 C CN100481657 C CN 100481657C
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Abstract
The invention relates to a realizing method of linetype cavity single polarization double-wavelength fibre grating laser, in particular to that PMF and two broadband fiber gratings are connected into a suitably-chosen active optical fiber, the reflectance spectrums of the broadband grating are separated with each other. Two reflection peaks are opposite to one of the PMF grating, each grating and one polarization state of the PMF grating compose a resonance cavity, therefore, which can't compose a resonance cavity, each cavity is separated. The double-wavelength laser of stable single polarization can be output at the output end of the linetype cavity. Comparing with the double-wavelength laser, the invention can realize stable single polarization state output more easily, which makes the variance in length and other characters of the active optical fiber won't lead to the substantive effect of single polarization double-wavelength laser. The invention is less affected by the environment, which has high reliability, low cost, compact structure, strong practicality and high cost performance.
Description
Technical field
The present invention relates to optical fiber communication, microwave photon, Fibre Optical Sensor and fiber laser technology field, is a kind of implementation method of linetype cavity single polarization dual wavelength optical fiber grating laser specifically.
Background technology
Fiber-grating laser is a kind of up-and-coming light source in the optical fiber telecommunications system, its advantage is mainly reflected in: the difficult WDM standard of wavelength that meets the ITU-T suggestion of the wavelength of (1) semiconductor laser, and cost is very high, and the rare-earth doped optical fibre grating laser utilizes fiber grating etc. can determine wavelength very exactly, and cost is very low.(2) as the rare-earth doped optical fibre manufacture craft comparative maturity of gain, rare earth ion doped process is simple, and fibre loss is little.(3) adopt the high pumping of dexterous compact efficient to become possibility.(4) fiber-grating laser has the waveguide type optical fiber structure, can produce higher power density at fiber core layer.Optical fiber structure has higher area-volume ratio, thereby radiating effect is better.Compatible good with standard traffic optical fiber can be adopted multiple fiber optic components such as fiber grating, coupler, reduces the demand of block optical element and the trouble of light path mechanical adjustment, greatly simplifies the design and the making of fiber-grating laser.(5) broadband is one of main development trend of optical fiber communication, and fiber-grating laser can be realized laser output by mixing different rare earth ions in the broadband range of 380～3900nm, and it is easy and tunable that wavelength is selected.(6) little, the anti-electromagnetic interference of the frequency chirp effect under the high frequency modulated, temperature expansion coefficient are little etc. than semiconductor laser.
And common non-polarization maintaining optical fibre, because manufacturing process causes core cross sections that certain ovality is arranged, or, cause the anisotropy of optical fibre refractivity because optical fiber component material coefficient of thermal expansion coefficient inhomogeneities causes anisotropic stress or applied stress on the optical fiber cross section.In a word, when the symmetry in optical fiber cross section is destroyed, can produce between the orthogonal polarization modes of two different transmissions that formed by birefringence and intercouple, because the transmission of two polarization modes differs very little, thereby Mode Coupling is very strong.The birefringence that optical fiber structure itself exists and the effect of outer bound pair optical fiber all are at random, thereby the coupling between the polarization mode is at random, therefore generally speaking, the laser of fiber laser output is the polarization confusion, can't reach the degree of polarization of semiconductor laser output laser, such laser output under many circumstances all can't be practical.Some polarization fiber laser is realized in the laboratory at present, has utilized complicated control mode such as polarization maintaining optical fibre, polarization-maintaining coupler and Polarization Control, and with high costs, the practicability difficulty is big.
Summary of the invention
Purpose of the present invention just provides a kind of implementation method of linetype cavity single polarization dual wavelength optical fiber grating laser, it can overcome the deficiency of existing single polarization dual-wavelength fiber grating laser, not needing to realize the single polarization dual-wavelength fiber grating laser of Polarization Control.
The implementation method of linetype cavity single polarization dual wavelength optical fiber grating laser of the present invention may further comprise the steps:
1) selects an Active Optical Fiber, insert a polarization-maintaining fiber grating therebetween.
2) at the other two ends of Active Optical Fiber difference access band fiber grating, band optical fiber grating reflection spectrum is spaced-apart, does not have lap, or more weak lap is arranged.
3), utilize coupler that pump light is coupled in the Active Optical Fiber respectively in the back of two band optical fiber gratings.
4) two broadband grating reflection peaks are aimed at a reflection peak of polarization-maintaining fiber grating respectively, and each broadband grating only constitutes resonant cavity with the reflection peak of a polarization state of polarization-maintaining fiber grating, produces laser, online die cavity output outputting dual wavelength laser.
When pump light was coupled in the Active Optical Fiber, the reflection peak resonance of a polarization state of each broadband grating and polarization-maintaining fiber grating produced the laser of single polarization state.Each chamber is independently, and the laser that two chambeies produce can not be coupled mutually and form the problem of mode competition or polarization state change at random, the some wavelength output or the problems of two wavelength outputs at random also can not occur having only.Because band optical fiber grating reflection spectrum is spaced-apart, can not constitute resonant cavity.
Beneficial effect of the present invention is specific as follows:
The Active Optical Fiber that existing dual wavelength fibre laser needs is inclined to one side for protecting, coupler also will be protected inclined to one side, and add the output that Polarization Control, Polarization Detection guarantee dual wavelength single polarization fiber laser, perhaps need to eliminate at low temperatures mode competition, produce dual wavelength.Reliability is low, the cost height, and control is complicated, is difficult to practicality.
And the present invention adopts than protecting the much lower common Active Optical Fiber of inclined to one side Active Optical Fiber as gain media, only needs a polarization-maintaining fiber grating, guarantees that each chamber resonance is on a polarization state.The laserresonator of each polarization state is independently, can eliminate conventional active polarization maintaining optical fibre and produce the problem of the mode competition of dual wavelength, the stochastic model coupling can not occur, causes the change at random of wavelength or polarization state, does not need Polarization Control.Because an end of fiber laser resonant cavity has adopted the grating in broadband, make it easier to quasi-resonance, reduced requirement, than the easier realization of common dual laser grating with the reflection peak of arrowband polarization maintaining optical fibre, export more stable single-polarization, have higher cost performance.The present invention has reduced the coherence request to Active Optical Fiber, makes the inconsistent substantial influence that can not cause the single polarization dual-wavelength laser of characteristics such as Active Optical Fiber length.The present invention also has little, compact conformation affected by environment, characteristics such as easy to implement.
Description of drawings
Fig. 1 is a linetype cavity single polarization dual wavelength optical fiber grating laser implementation method principle schematic.
The fiber grating schematic diagram that Fig. 2 adopts for the linetype cavity single polarization dual wavelength optical fiber grating laser implementation method.
Fig. 3 is single pump light implementation method principle schematic for linetype cavity single polarization dual wavelength optical fiber grating laser adopts.
Embodiment
Below in conjunction with accompanying drawing 1-3 and embodiment the present invention is further described.
Embodiment 1:
Linetype cavity single polarization dual wavelength optical fiber grating laser implementation method 1 may further comprise the steps:
1) selecting doping content is Active Optical Fiber (21) and (22) of the long er-doped of 1m of 1000ppm, and Active Optical Fiber (21) and (22) are coupled together with polarization-maintaining fiber grating (11).
2) at the other two ends of Active Optical Fiber (21) and (22) difference access band fiber grating (12) and (13), the reflectance spectrum of band optical fiber grating (12) and (13) is spaced-apart, there is not lap, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-maintaining fiber grating of lap correspondence hangs down 1dB at least.
3), utilize coupler that pump light (31) and (32) are coupled in the Active Optical Fiber respectively in the back of two band optical fiber gratings (12) and (13).
4) two reflection peaks of polarization-maintaining fiber grating (11) form the different wavelength of laser resonant cavity with band optical fiber grating (12) and (13) respectively, produce laser, online die cavity (41) or end, line style chamber (42) outputting dual wavelength laser.The laser of output can further be handled, as the light source of other purposes such as microwave photon.
111 is a reflection peak of polarization-maintaining fiber grating among Fig. 2,112 is the another one reflection peak of polarization-maintaining fiber grating, and 121 is the reflection peak of a band optical fiber grating (12), distinguishes with dotted line, 131 is the reflection peak of a band optical fiber grating (13), distinguishes with dotted line.The reflection peak of polarization-maintaining fiber grating (111) constitutes a resonant cavity with band optical fiber grating (121), Active Optical Fiber (21), the another one reflection peak (112) of polarization-maintaining fiber grating constitutes a resonant cavity with band optical fiber grating (131), Active Optical Fiber (22), this two chambeies resonance under the effect of pumping laser, the laser of two single polarization wavelength of generation.
Embodiment 2:
Linetype cavity single polarization dual wavelength optical fiber grating laser implementation method 2 may further comprise the steps:
1) selecting doping content is Active Optical Fiber (21) and (22) of the long er-doped of 1m of 1000ppm, and Active Optical Fiber (21) and (22) are coupled together with polarization-maintaining fiber grating (11).
2) at the other two ends of Active Optical Fiber (21) and (22) difference access band fiber grating (12) and (13), the reflectance spectrum of band optical fiber grating (12) and (13) is spaced-apart, there is not lap, or more weak lap is arranged, promptly the reflectivity of the luminance factor polarization-maintaining fiber grating of lap correspondence hangs down 1dB at least.
3) adopt optical splitter, pump light (31) is divided into (52) and (53) two-way by beam split.
4), utilize coupler that pump light (52) and (53) are coupled in the Active Optical Fiber respectively in the back of two band optical fiber gratings (12) and (13).
5) two reflection peaks of polarization-maintaining fiber grating (11) form the different wavelength of laser resonant cavity with band optical fiber grating (12) and (13) respectively, produce laser, online die cavity (41) or line style chamber (42) end outputting dual wavelength laser.The laser of output can further be handled, as the light source of other purposes such as Fibre Optical Sensor.
Claims (1)
1. the implementation method of a linetype cavity single polarization dual wavelength optical fiber grating laser is characterized in that its implementation may further comprise the steps:
1) selects an Active Optical Fiber, insert a polarization-maintaining fiber grating therebetween;
2) at the other two ends of Active Optical Fiber difference access band fiber grating, band optical fiber grating reflection spectrum is spaced-apart, there is not lap, or the low at least 1dB of reflectivity of the luminance factor polarization-maintaining fiber grating of band optical fiber grating reflection spectrum lap correspondence;
3) two band optical fiber grating back, utilize coupler that pump light is coupled in the Active Optical Fiber respectively;
4) reflection peak of polarization-maintaining fiber grating is aimed at two band optical fiber optical grating reflection peaks respectively, and each broadband grating only constitutes resonant cavity with the reflection peak of a polarization state of polarization-maintaining fiber grating, produces laser, online die cavity output outputting dual wavelength laser.
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| CN101363945B (en) * | 2008-10-14 | 2010-06-09 | 北京交通大学 | Alloptical fiber non-dispersive adjustable grating attenuator with filtering function |
| CN101793570B (en) * | 2009-10-21 | 2012-08-08 | 南京大学 | Sensing method of optical-fiber Bragg grating laser device |
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| 单偏振的双波长光纤激光器的实验研究. 宁提纲等.半导体光电，第28卷第1期. 2007 |
| 单偏振的双波长光纤激光器的实验研究. 宁提纲等.半导体光电，第28卷第1期. 2007 * |
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