CN102684048B - Super-fluorescence optical fiber light source based on parallel structure - Google Patents
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Abstract
本发明提供一种基于并联结构的超荧光光纤光源，包括：多个并联分支，其中每个并联分支包括：至少一个泵浦光产生装置，用于产生至少一路泵浦光，至少一个偏振控制器，每个偏振控制器与每个泵浦光产生装置的输出端连接，用于调节每路泵浦光的泵浦偏振态，至少一个波分复用器，每个波分复用器与每个偏振控制器的输出端连接，用于将每路泵浦光注入至增益介质，增益介质，用于吸收泵浦光，以激发产生超荧光并且放大；和超荧光信号合束器，用于将来自每个并联分支的一部分超荧光按比例叠加并输出。根据本发明实施例的超荧光光纤光源可以显著提高超荧光光纤光源平均波长的稳定性。
The present invention provides a super fluorescent fiber light source based on a parallel structure, including: a plurality of parallel branches, wherein each parallel branch includes: at least one pump light generating device for generating at least one path of pump light, at least one polarization controller , each polarization controller is connected to the output end of each pump light generating device for adjusting the pump polarization state of each pump light, at least one wavelength division multiplexer, each wavelength division multiplexer is connected to each The output end connection of each polarization controller is used to inject each pump light into the gain medium, and the gain medium is used to absorb the pump light to excite and generate superfluorescence and amplify it; and the superfluorescence signal beam combiner is used for A fraction of the hyperfluorescence from each parallel branch is scaled and output. The superfluorescent fiber optic light source according to the embodiments of the present invention can significantly improve the stability of the average wavelength of the superfluorescent fiber optic light source.
Description
Technical field
The present invention relates to optic fiber gyroscope field, particularly a kind of superfluorescent fiber sources based on parallel-connection structure.
Background technology
Optic fiber gyroscope, in application process, is easy to be subject to relevant error that backscattering in fiber optic loop, polarization coupled effect and Kerr effect etc. cause and the impact of noise.For suppressing the interference of this type of error and noise, optic fiber gyroscope need to adopt wide spectrum light source.And the optic fiber gyroscope of applying for micron order, its zero bias stability need to be at 0.001 °/h, and constant multiplier stability requirement is 10
-6below, this requires light source not only to have wider output spectrum, also will have good mean wavelength stability.As a kind of low coherence's wideband light source, superfluorescent fiber sources output spectrum is wider, and has good mean wavelength stability, thereby becomes the comparatively desirable light source selection of micron order optic fiber gyroscope.
The stability of superfluorescent fiber sources mean wavelength is affected by the factors such as pump power, pumping wavelength, gain fibre length, polarization of pumping beams and light-source structure.Be embodied in: when pump power changes, due to the effect of gain saturation effect, can cause the variation of final output spectrum shape; LD(laser diode, laser diode) pumping source wavelength can change with the variation of ambient temperature, when pumping wavelength changes, gain fibre can change to the absorption of pump power, and then impact is along the spectral shape of population inversion and the final output of gain fibre distribution; Due to the effect of gain saturation effect, different gain fibre length can cause the variation of final output spectrum shape; The Polarization-Dependent Gain effect that rare earth gain particle in gain fibre shows makes superfluorescent fiber sources mean wavelength be subject to the impact of polarization of pumping beams.These factors all can cause the variation of final output spectrum mean wavelength.
At document (ELECTRONICS LETTERS, 2002,38 (9): 406 ~ 408), a kind of series connection light channel structure is provided, realize and optimize output spectrum width and power, and by regulating when fiber lengths ratio of pump power, the hot coefficient of intrinsic of er-doped gain fibre is eliminated in 30 ℃ to 85 ℃ temperature ranges.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency, a kind of superfluorescent fiber sources based on parallel-connection structure is particularly provided, reduce the impacts of factor on the stability of superfluorescent fiber sources mean wavelength such as pump power, pumping wavelength, gain fibre length, polarization of pumping beams and light-source structure, significantly improve the stability of superfluorescent fiber sources mean wavelength.
For achieving the above object, the invention provides a kind of superfluorescent fiber sources based on parallel-connection structure, comprise: a plurality of parallel branchs, wherein described in each, parallel branch comprises: at least one pump light generation device, for generation of at least one road pump light, at least one Polarization Controller, described in each, Polarization Controller is connected with the output of pump light generation device described in each, for regulating the pumping polarization state of pump light described in every road, at least one wavelength division multiplexer, described in each, wavelength division multiplexer is connected with the output of Polarization Controller described in each, for pump light described in Jiang Mei road, be injected into gain media, described gain media, be used for absorbing described pump light, to excite, produce superfluorescence and amplification, with superfluorescence signal bundling device, for a part of superfluorescence from parallel branch described in each is superposeed in proportion and exported.
In one embodiment of the invention, described in each parallel branch comprise at least one independently laser diode pumping source as described pump light generation device.
In one embodiment of the invention, described in each, independently laser diode pumping source has independently pumping polarization state, pump power, pumping wavelength.
In one embodiment of the invention, described in each, parallel branch comprises an independently described laser diode pumping source, and the mode by forward pumping or backward pump produces a road pump light.
In one embodiment of the invention, described in each, parallel branch comprises two independently described laser diode pumping sources, separates from the both sides of described gain media, and the mode by two directional pump produces two-way pump light.
In one embodiment of the invention, described a plurality of parallel branch shares at least one pump light generation device, described pump light generation device comprises: laser diode pumping source and opump beam-splitting device, described opump beam-splitting device is multichannel pump light for described laser diode pumping source is produced to the pump light beam splitting of Yi road, to offer respectively parallel branch described in each.
In one embodiment of the invention, by regulating the beam splitting ratio of described opump beam-splitting device, to regulate and distribute the pump power ratio to parallel branch described in each.
In one embodiment of the invention, described a plurality of parallel branchs share a described pump light generation device, and the mode by forward pumping or backward pump produces multichannel pump light, to offer respectively parallel branch one road pump light described in each.
In one embodiment of the invention, described a plurality of parallel branch shares two described pump light generation devices, separate from the both sides of described gain media, the mode by two directional pump respectively produces multichannel pump light, to offer respectively parallel branch two-way pump light described in each.
In one embodiment of the invention, described in each, parallel branch also comprises reflex control end, described reflex control end is connected with the fluorescence output of described wavelength division multiplexer or the output of described gain media, for the described superfluorescent another part amplifying being reflexed to described gain media, continues to amplify by output after described superfluorescence signal bundling device stack.
In one embodiment of the invention, described reflex control end comprises: the combination of one or more in faraday rotation mirror, speculum and fiber grating.
In one embodiment of the invention, also comprise isolator, described isolator is connected with the output of described superfluorescence signal bundling device, for stopping by the superfluorescence feedback of described superfluorescence signal bundling device output, injects described superfluorescence signal bundling device.
In one embodiment of the invention, by regulating the gain fibre length of the described gain media of parallel branch described in each, with the described superfluorescent mean wavelength of regulation output.
The embodiment of the present invention provides a kind of superfluorescent fiber sources based on parallel-connection structure, has the following advantages:
1,, by multichannel independence pumping source or the same pumping source power multichannel beam splitting pumping based on parallel-connection structure is set, the output characteristic that realizes superfluorescent fiber sources can regulate on a large scale, improves the flexibility regulating;
2, by the pumping polarization state of each parallel branch of Polarization Controller independent regulation is set, reduce the superfluorescent polarization extinction ratio of output, weaken the impact of polarization state on output superfluorescence mean wavelength stability simultaneously;
3, adopt each parallel branch of independent pumping source to there is independently pumping polarization state, pump power, pumping wavelength, by regulating respectively above each parameter, can improve the stability of output superfluorescence mean wavelength;
4, adopt each parallel branch of same pumping source power multichannel beam splitting pumping to realize the adjustability of each parallel branch pump power allocation proportion by regulating the beam splitting ratio of opump beam-splitting device, and then improve the stability of output superfluorescence mean wavelength;
Ratio while 5, closing bundle by the adjustment of superfluorescence signal bundling device between each parallel branch superfluorescence signal, selects the wavelength of good stability, thereby after realization stack, has the spectrum output of high stability mean wavelength;
6,, by each parallel branch being chosen to suitable gain fibre length, to reduce the impact of gain saturation effect on output spectrum shape, and then improve the stability of exporting superfluorescence mean wavelength.
The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention one;
Fig. 2 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention two;
Fig. 3 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention three;
Fig. 4 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention four;
Fig. 5 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention five;
Fig. 6 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention six.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.In addition,, in description of the invention, except as otherwise noted, the implication of " a plurality of " is two or more.
The invention provides a kind of superfluorescent fiber sources based on parallel-connection structure, this superfluorescent fiber sources can have a plurality of parallel branchs, for convenience of description for the purpose of, following embodiment all be take three parallel branchs and is described as example.The pumping source of each parallel branch can be by one independently pump light generation device produce independently pump light of Yi road, can be also by offering each parallel branch after same pump light generation device power multichannel beam splitting pumping.Below in conjunction with accompanying drawing 1-6, describe respectively based on each embodiment of the present invention.
Fig. 1 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention one.The superfluorescent fiber sources that Figure 1 shows that the multichannel independence pumping source with forward pumping structure, this superfluorescent fiber sources comprises: three parallel branchs and a superfluorescence signal bundling device 8.Each parallel branch comprises: independently pump light generation device (in Fig. 1, the pump light generation device of each parallel branch being designated as respectively to 1,2,3), Polarization Controller 4, wavelength division multiplexer 6 and a gain media 7.
In the present embodiment, pump light generation device 1,2,3 can be LD pumping source, and each LD pumping source produces a road pump light by the mode of forward pumping.It should be noted that, in actual applications, pump light generation device 1,2,3 also can comprise respectively a plurality of LD pumping sources as required, and the multichannel pump light that the plurality of LD pumping source produces is coupled as a road pump light through a pump combiner.Because each parallel branch has independently LD pumping source, Ji Mei road pump light can have independently pumping polarization state, pump power, pumping wavelength, by regulating above each parameter, to improve the stability of output superfluorescence mean wavelength.The wherein adjusting of the pumping polarization state of Dui Mei road pump light is by the output at each LD pumping source, one Polarization Controller 4 to be set to be achieved.By Polarization Controller 4, regulate the pumping polarization state of each parallel branch, reduce the superfluorescent polarization extinction ratio of output, weaken the impact of polarization state on output superfluorescence mean wavelength stability simultaneously.
Gain media 7, for absorbing this road pump light, produces superfluorescence and amplification to excite.In the present embodiment, gain media 7 consists of rear-earth-doped gain fibre, and the doping way of gain particle on gain fibre cross section can adulterate for flat-top, flat part adulterates or gradual change type doping.Effect due to gain saturation effect, different gain fibre length can cause the variation of final output spectrum shape, in the present embodiment, can be by each parallel branch being chosen to suitable gain fibre length, to reduce the impact of gain saturation effect on output spectrum shape, and then improve the stability of output superfluorescence mean wavelength.
Superfluorescence signal bundling device 8 is for superposeing a part of superfluorescence from each parallel branch in proportion and export.Ratio while closing bundle by 8 adjustment of superfluorescence signal bundling device between each parallel branch superfluorescence signal, the wavelength of selection good stability, exports thereby realization has the spectrum of high stability mean wavelength after superposeing.
The superfluorescence producing due to gain media 7 is two-way propagation when exporting, and a part of superfluorescence of propagating along one of them direction inputs to the rear output of superfluorescence signal bundling device 8 stack, along the dissipation of another part superfluorescence of other direction propagation.Alternatively, if need the superfluorescence of this part dissipation, reflex control end 5 can be set in this superfluorescent fiber sources, reflex control end 5 is connected with the fluorescence output of wavelength division multiplexer 6, for the superfluorescent another part amplifying being reflexed to gain media 7, continues to amplify by output after 8 stacks of superfluorescence signal bundling device.Reflex control end 7 can comprise: the combination of one or more in faraday rotation mirror, speculum and fiber grating.
In preferred embodiment of the present invention, this superfluorescent fiber sources also comprises isolator 9, isolator 9 is connected with the output of superfluorescence signal bundling device 8, for stopping by the superfluorescence feedback of superfluorescence signal bundling device 8 outputs, inject superfluorescence signal bundling device 8, to avoid superfluorescence echo on exporting the impact of superfluorescent mean wavelength stability.
Fig. 2 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention two.Figure 2 shows that the superfluorescent fiber sources of the multichannel independence pumping source with backward pump structure, compare with the superfluorescent fiber sources shown in Fig. 1, its difference is only, the pumping source of every road parallel branch is from different shown in the relative position of its gain fibre 7 and Fig. 1, and the reflex control end 5 of each parallel branch is to be connected with the output of gain media 7.The superfluorescent fiber sources of embodiment bis-is backward pump structure.With embodiment mono-in like manner, according to the superfluorescent fiber sources of the present embodiment by regulating pumping polarization state, pumping wavelength, pump power, gain fibre length and the suitable superfluorescence signal of each parallel branch to close beam ratio example, control the superfluorescence that each parallel branch independently produces, realize the stack of each parallel branch superfluorescence signal, thereby obtain the stable superfluorescent fiber sources of output mean wavelength.
Fig. 3 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention three.Figure 3 shows that the superfluorescent fiber sources of the multichannel independence pumping source with two directional pump structure, compare with the superfluorescent fiber sources shown in Fig. 1, its difference is only, every road parallel branch comprises two independently LD pumping sources, separate from the both sides of gain media 7, the mode by two directional pump produces two-way pump light.With embodiment mono-in like manner, according to the superfluorescent fiber sources of the present embodiment by regulating pumping polarization state, pumping wavelength, pump power, gain fibre length and the suitable superfluorescence signal of each parallel branch to close beam ratio example, control the superfluorescence that each parallel branch independently produces, realize the stack of each parallel branch superfluorescence signal, thereby obtain the stable superfluorescent fiber sources of output mean wavelength.
Fig. 4 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention four.Figure 4 shows that the superfluorescent fiber sources of the same pumping source power multichannel beam splitting pumping with forward pumping structure, compare with the superfluorescent fiber sources shown in Fig. 1, its difference is only, a plurality of parallel branchs share a pump light generation device, this pump light generation device comprises: LD pumping source 1 and opump beam-splitting device 10, opump beam-splitting device 10 is for LD pumping source is produced to pump light beam splitting Wei San road, Yi road, to offer respectively each parallel branch one road pump light.According to the superfluorescent fiber sources of the present embodiment, pass through to regulate the beam splitting ratio of opump beam-splitting device 10, to regulate and distribute the pump power ratio to each parallel branch, and by regulating pumping polarization state, gain fibre length and the suitable superfluorescence signal of each parallel branch to close beam ratio example, control the superfluorescence that each parallel branch independently produces, realize the stack of each parallel branch superfluorescence signal, thereby obtain the stable superfluorescent fiber sources of output mean wavelength.
Fig. 5 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention five.Figure 5 shows that the superfluorescent fiber sources of the same pumping source power multichannel beam splitting pumping with backward pump structure, compare with the superfluorescent fiber sources shown in Fig. 4, its difference is only, the shared pump light generation device of a plurality of parallel branchs is different from the relative position of the gain fibre 7 of each parallel branch, and the reflex control end 5 of each parallel branch is to be connected with the output of gain media 7.The superfluorescent fiber sources of embodiment five is backward pump structure.With embodiment tetra-in like manner, according to the superfluorescent fiber sources of the present embodiment, pass through to regulate the beam splitting ratio of opump beam-splitting device 10, to regulate and distribute the pump power ratio to each parallel branch, and by regulating pumping polarization state, gain fibre length and the suitable superfluorescence signal of each parallel branch to close beam ratio example, control the superfluorescence that each parallel branch independently produces, realize the stack of each parallel branch superfluorescence signal, thereby obtain the stable superfluorescent fiber sources of output mean wavelength.
Fig. 6 is the structural representation of the superfluorescent fiber sources based on parallel-connection structure of the embodiment of the present invention six.Figure 6 shows that the superfluorescent fiber sources of the same pumping source power multichannel beam splitting pumping with two directional pump structure, compare with the superfluorescent fiber sources shown in Fig. 4, its difference is only, a plurality of parallel branchs share two pump light generation devices, separate from the both sides of gain media 7, mode by two directional pump respectively produces three road pump lights, to offer respectively each parallel branch two-way pump light.With embodiment tetra-in like manner, according to the superfluorescent fiber sources of the present embodiment, pass through to regulate the beam splitting ratio of opump beam-splitting device 10, to regulate and distribute the pump power ratio to each parallel branch, and by regulating pumping polarization state, gain fibre length and the suitable superfluorescence signal of each parallel branch to close beam ratio example, control the superfluorescence that each parallel branch independently produces, realize the stack of each parallel branch superfluorescence signal, thereby obtain the stable superfluorescent fiber sources of output mean wavelength.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
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| KR100346221B1 (en) * | 2000-09-06 | 2002-08-01 | 삼성전자 주식회사 | Gain control device and method thereof for a erbium doped fiber amplifier |
| KR100475412B1 (en) * | 2002-03-11 | 2005-03-10 | 주식회사 럭스퍼트 | Top-pumped optical device and its array |
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| Wencai Huang et al..Stable and wideband L-band erbium superfluorescent fiber source using improved bi-directional pumping configuration.《OPTICS EXPRESS》.2007,第15卷(第15期),全文. * |
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