CN201853936U - Optical fiber device for blending optical fiber distribution feedback laser with optical fiber amplifier - Google Patents
Optical fiber device for blending optical fiber distribution feedback laser with optical fiber amplifier Download PDFInfo
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- CN201853936U CN201853936U CN2010202608324U CN201020260832U CN201853936U CN 201853936 U CN201853936 U CN 201853936U CN 2010202608324 U CN2010202608324 U CN 2010202608324U CN 201020260832 U CN201020260832 U CN 201020260832U CN 201853936 U CN201853936 U CN 201853936U
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Abstract
The utility model relates to an optical fiber device for blending an optical fiber distribution feedback laser with an optical fiber amplifier, which belongs to the technical field of an optical fiber laser. The optical fiber device comprises a 980nm pump light source, a wavelength division multiplexer, a DFB-FL (Distribution Feedback-Fiber Laser) and an isolator. The optical fiber device is characterized in that the reserved length of an erbium-doped fiber when the erbium-doped fiber is arranged at the front end of the DFB-FL and the reserved length of the erbium-doped fiber when the erbium-doped fiber is arranged at the rear end of the DFB-FL are increased to be 15-120cm. In the optical fiber device, the generation and amplifying of lasers are integrated together, and the structure is simple, therefore, the optical fiber device reasonably utilizes pump light and also reduces dissipation caused by fiber fusion. In addition, the multiplexing of a plurality of devices is convenient, and a sensor network is conveniently formed; and each level of sensing has self amplifying, therefore, the signal strength in the sensing process is ensured, the signal demodulation in a subsequent system is convenient, and the optical fiber device can be widely applied to optical fiber communication and optical fiber sensing.
Description
Technical field
The utility model relates to the optical fibre device of a kind of fusion fiber distribution feedback laser (DFB-FL) and fiber amplifier, specifically be the fine distributed feedback laser of a kind of light harvesting with fiber amplifier in the novel optical fiber device of one, genus fiber laser technology field.
Background technology
At present, the application of laser more and more widely, distributed feedback optical fiber laser (DFB-FL) is owing to have extremely narrow live width, very high signal to noise ratio, wavelength linear is adjustable, and low phase noise and stable advantages such as single mode output can be used as the extremely superior light source of optical fiber sensing system, carry out overlength distance, the sensing of superhigh precision and superelevation susceptibility.
DFB (Distributed Feed Back) fiber laser is different with traditional laser, it does not have traditional chamber mirror, but the optical grating constitution resonant cavity that directly writes at rare-earth doped optical fibre, active area and feedback district are all one, only realize light feedback and wavelength selection with a grating, thereby have advantages such as line width, noise are little, be an important directions of fiber laser development.Distributed Feedback Laser is applied in the sensory field of optic fibre,, will improves the performance of Fibre Optical Sensor greatly as optical fiber sensor head.And the power output of general DFB fiber laser is all smaller, and the power output that therefore how to improve Distributed Feedback Laser becomes the problem that needs solve.At present, often adopt following two kinds of methods to realize:
Improve the pump power of DFB fiber laser, when pump power was strong, the laser intensity of output also can strengthen accordingly, this kind method is simple in structure, but need stronger pump light, pumping source has been proposed higher requirement, add lower conversion efficiency, pump light greatly is wasted, and when the pumping light intensity arrived certain value, conversion efficiency can reduce, and most pump light sees through DFB-FL, do not have the effect of pumping, as shown in Figure 1.
DFB optical-fiber laser to outgoing enters fiber amplifier again, and DFB-FL is further amplified, be easy to reach the power that we need like this, problem is that we need add a fiber amplifier (EDFA) again, has added a pumping source, cause the increase of cost, and when using DFB-FL to constitute sensing network, when a plurality of DFB-FL were multiplexing, we dragged an EDFA can not for each DFB-FL again, this scheme is obviously unworkable, as shown in Figure 3.
Paper " Performance Limitations of High-Power DFB Fiber Lasers " [K.H.
Jarkko, Member, IEEE, and A.B.Grudinin, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL.15, NO.2, FEBRUARY 2003.] in mentioned two kinds of above-mentioned methods and improved the power output of DFB-FL, and contrast, there is lower conversion efficiency in the former, has caused the waste of pump light; The latter then is the system of a complexity, is not suitable for the multiplexing of system and forms sensing network.
Summary of the invention
In order to overcome defective and the deficiency that prior art exists, the utility model proposes and a kind of EDFA (fiber amplifier) part and DFB-FL are integrated into a method and a device in the optical fiber, aim to provide a kind of simple, can rationally utilize pump light, and be convenient to form sensing network, be fit to a plurality of multiplexing method and systems.
The technical solution of the utility model realizes in the following manner.
A kind of optical fibre device that merges fiber distribution feedback laser and fiber amplifier, comprise 980nm pump light source (LD), wavelength division multiplexer (WDM), DFB-FL and isolator (ISO), when erbium-doped fiber during, the 980nm pump light source is linked to each other with the 980nm input of wavelength division multiplexer (WDM) by its magnetic tape trailer is fine at the DFB-FL front end; The Er-doped fiber that the common port of wavelength division multiplexer (WDM) is reserved by common single mode optical fibres and DFB-FL front end is connected; The 1550nm of wavelength division multiplexer (WDM) end is received the other end output laser of positive input isolator of isolator when erbium-doped fiber during in the DFB-FL rear end by ordinary optic fibre, the 980nm input of 980nm pump light source with ordinary optic fibre and wavelength division multiplexer (WDM) is connected, the common port of wavelength division multiplexer (WDM) is connected on the end of 3db coupler by ordinary optic fibre, and the other end of 3db coupler is received on the DFB-FL; The Er-doped fiber of reserving on the DFB-FL rear end connects ordinary optic fibre, is connected by ordinary optic fibre to be connected on the 3db coupler; The 1550nm end of wavelength division multiplexer (WDM) is linked on the isolator by ordinary optic fibre, other end output laser from isolator, the length that it is characterized in that Er-doped fiber that erbium-doped fiber is reserved and the Er-doped fiber of reserving when the DFB-FL front end when erbium-doped fiber is on the DFB-FL rear end strengthens, and is 15-120cm.
In the prior art generally, as depicted in figs. 1 and 2, the pump light of 980nm enters the distributed feed-back of inscribing grating through WDM and mixes Er
3+Fiber region, Er
3+Absorb after the pump energy of 980nm, transit to high level from ground state level, high level is a unsettled energy level, therefore transits to upper laser level in radiationless mode soon.Upper laser level is a metastable energy level, Er
3+Ion is longer in the life-span of upper laser level, therefore can accumulate gradually.Along with the continuous injection of pump light, realized the population inversion between upper laser level and the following energy level.When the spontaneous radiation of 1550nm wave band takes place, can cause, make Er with stimulated radiation frequently
3+Transit to laser lower level from upper laser level, the energy of generation amplifies the light of this wave band.Each row light wave is propagated in the grating periodic structure, all accepts the light wave propagated from the relative direction of Bragg reflection along the every bit of its propagation path, by the distribution of lengths feedback of periodic structure.Because the bragg wavelength of phase-shifted grating is certain, therefore an excited radiation light to specific wavelength feeds back, and very high (＞99%) of grating reflection rate produces laser so the feedback light of this wavelength is just constantly amplified.Because phase-shifted grating has been opened a transmission window in reflectance spectrum, so the laser that produces can be exported in the chamber of height reflection.The laser of a part returns from forward direction, by WDM, because the filter action of wavelength division multiplexer, the light of 1550nm wave band enters isolator (ISO), rather than returning semiconductor laser, the light that comes out from isolator is exactly the DFB optical-fiber laser of our narrow linewidth that needs.
DFB-FL utilizes argon ion laser or excimer laser that λ/4 phase-shifted gratings are write on the rear-earth-doped optical fiber to constitute resonant cavity, active area and feedback district are all one, just can realize the selection of feedback and wavelength with a grating, obtain single longitudinal mode, narrow linewidth work easily, and frequency stability is better, Sidelobe Suppression has also been avoided the splice loss, splice attenuation of Active Optical Fiber and grating than high.The utility model is exactly that the rare-earth doped optical fibre (generally being er-doped) that will inscribe grating reserves one section Er-doped fiber (the reservation Er-doped fiber of the DFB-FL in the prior art generally is 2-10cm, and reservation optical fiber of the present utility model is at 15-120cm.)。When the erbium-doped fiber of reserving during at the DFB-FL front end, the pump light of 980nm injects after the Er-doped fiber of reserving via wavelength division multiplexer (WDM), part light is used to produce the ASE light (amplified spontaneous emission light source Amplified Spontaneous Emission) of 1525-1565nm, the light of part 980nm enters in the DFB-FL as pump light, produce the narrow-linewidth laser that we need, the ASE light that produces also can be used as pump light and excites DFB light, backward scattered DFB light returns Er-doped fiber again, enter as seed light, Er-doped fiber produces amplification, because the competition of pattern, the ASE light of other wavelength is suppressed, just DFB light is amplified,, amplify later DFB light by isolator output through wavelength division multiplexer filtering.Utilize unnecessary pump light and doped fiber to constitute the fiber amplifier of an EDFA, the DFB-FL that produces is directly amplified, select suitable doped fiber length and pump power, reach bigger power output.
When the Er-doped fiber of reserving places the DFB-FL rear end, the 980nm pump light injects DFB-FL, produce the laser of narrow linewidth, inject the Er-doped fiber of reserving as seed light, utilize unnecessary pump light and doped fiber to constitute the fiber amplifier of an EDFA, the DFB-FL that produces is directly amplified, select suitable doped fiber length and pump power, reach bigger power output.Output light will be exported from forward direction, as Application in Sensing, need add into an optical fiber, we have designed a device with an optical fiber at this, as Fig. 5, and the pump light of 980nm, inject by WDM, through the coupler of a 2*2, the pump light of half injects DFB-FL, produce the laser of the narrow linewidth that we need, unnecessary pump light, the Er-doped fiber of injection rear end is as the pumping of amplifier, the pump light that comes out from the coupler other end, also inject the light of the 980nm that appears from DFB in Er-doped fiber and front, form the pumping optical fiber amplifier of a both-end, the narrow-linewidth laser that amplifies, return from coupler again,, export from isolator through WDM.
Above-mentioned EDFA is the abbreviation of English " Erbium-doped Optical Fiber Amplifier ", and meaning is an erbium-doped fiber amplifier.
The utility model is integrated together generation and the amplification of DFB-FL, and is simple in structure, both rationally utilized pump light, reduced again because the loss that fused fiber splice causes.And convenient a plurality of devices is multiplexing, be convenient to form sensing network, and the sensing of each grade all has the amplification of oneself, guaranteed the signal strength signal intensity in the sensing process, make things convenient for the demodulation of signal in the follow-up system, can be widely used in optical fiber communication and the Fibre Optical Sensor, particularly in the network of Fibre Optical Sensor, hydrophone etc. for example.
The utlity model has following advantage: simple in structure, can improve the utilance of pump light, and be suitable for the multiplexing of a plurality of DFB-FL, be convenient to form sensing network.
Description of drawings
Fig. 1. be the structural representation of common used DFB-FL.
Wherein: 1,980nm pump light source, 2, ordinary optic fibre, 3, wavelength division multiplexer, 4, ordinary optic fibre, 5, DFB-FL, 6, isolator, 7, ordinary optic fibre.
The schematic diagram of Fig. 2 .DFB-FL.
Wherein: 8, Er-doped fiber, 9, grating, 10, λ/4 phase shifts, 11, Er-doped fiber
Fig. 3 is the schematic diagram that DFB-FL amplifies under the prior art situation.
Wherein: 1,980nm pump light source, 2, ordinary optic fibre, 3, wavelength division multiplexer, 4, ordinary optic fibre, 5, DFB-FL, 6, ordinary optic fibre, 7, optical isolator, 12, the 980nm pump light source, 13, ordinary optic fibre, 14, wavelength division multiplexer, 15, ordinary optic fibre, 16, Er-doped fiber, 17, isolator.
Fig. 4 is the structural representation of erbium-doped fiber the utility model device when the DFB-FL front end.
Wherein: 18,980nm pump light source, 19 ordinary optic fibres, 20, wavelength division multiplexer, 21, ordinary optic fibre, 22 Er-doped fibers, 23, DFB-FL, 24, ordinary optic fibre, 25, isolator.
Fig. 5 is the structural representation when erbium-doped fiber the utility model device during in the DFB-FL rear end.
Wherein: 26,980nm pump light source, 27 ordinary optic fibres, 28, wavelength division multiplexer, 29, ordinary optic fibre, 30, the 3db coupler, 31, DFB-FL, 32, Er-doped fiber, 33, ordinary optic fibre, 34, ordinary optic fibre, 35, isolator.
Fig. 6 forms the schematic diagram of array for this device.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further, but is not limited thereto.
Embodiment 1:
The utility model embodiment 1 comprises 980nm semiconductor laser 18, wavelength division multiplexer 20, DFB-FL23 and isolator 25 as shown in Figure 4, and 980nm semiconductor laser 18 is linked to each other with the 980nm input of wavelength division multiplexer 20 by its magnetic tape trailer fibre 19; The common port of wavelength division multiplexer 20 is connected with the Er-doped fiber 22 that DFB-FL23 goes up the front end reservation by common single mode optical fibres 21; The 1550nm of wavelength division multiplexer 20 holds the positive input of receiving isolator 25 by ordinary optic fibre 24, and the other end output laser of isolator 25 is characterized in that the length of the Er-doped fiber 22 that front end is reserved on DFB-FL is 20cm.
Embodiment 2:
Identical with embodiment 1, just the length of the Er-doped fiber of reserving 22 is 60cm.
Embodiment 3:
Identical with embodiment 1, just the length of the Er-doped fiber of reserving 22 is 90cm.
Embodiment 4:
The utility model embodiment 4 comprises 980nm semiconductor laser 26, wavelength division multiplexer 28, DFB-FL31 and optical isolator 35 as shown in Figure 5, the 980nm input of 980nm semiconductor laser 26 usefulness ordinary optic fibres 27 and wavelength division multiplexer 28 is connected, the common port of wavelength division multiplexer 28 is connected on the end of 3db coupler 30 by ordinary optic fibre 29, and the other end of 3db coupler 30 is received on the DFB-FL31; The Er-doped fiber of reserving on the DFB-FL31 rear end 32 connects ordinary optic fibre 33, is connected on the 3db coupler 30 by ordinary optic fibre 33; The 1550nm of wavelength division multiplexer 28 end is linked on the isolator 35 by ordinary optic fibre 34, from the other end output laser of isolator 35, it is characterized in that the length of the Er-doped fiber 32 reserved is 30cm on the DFB-FL31 rear end.
Embodiment 5:
Identical with embodiment 4, just the length of the Er-doped fiber of reserving 32 is 70cm.
Embodiment 6:
Identical with embodiment 4, just the length of the Er-doped fiber of reserving 32 is 100cm.
Claims (1)
1. optical fibre device that merges fiber distribution feedback laser and fiber amplifier, comprise 980nm pump light source, wavelength division multiplexer, DFB-FL and isolator, when erbium-doped fiber during, the 980nm pump light source is linked to each other with the 980nm input of wavelength division multiplexer by its magnetic tape trailer fibre at the DFB-FL front end; The Er-doped fiber that the common port of wavelength division multiplexer is reserved by common single mode optical fibres and DFB-FL front end is connected; The 1550nm of wavelength division multiplexer holds the positive input of receiving isolator by ordinary optic fibre, the other end output laser of isolator; When erbium-doped fiber during in the DFB-FL rear end, the 980nm input of 980nm pump light source with ordinary optic fibre and wavelength division multiplexer is connected, the common port of wavelength division multiplexer is connected on the end of 3db coupler by ordinary optic fibre, and the other end of 3db coupler is received on the DFB-FL; The Er-doped fiber of the last reservation of DFB-FL connects ordinary optic fibre, is connected on the 3db coupler by ordinary optic fibre; The 1550nm end of wavelength division multiplexer is linked on the isolator by ordinary optic fibre, other end output laser from isolator, the length that it is characterized in that Er-doped fiber that erbium-doped fiber is reserved and the Er-doped fiber of reserving when the DFB-FL front end when erbium-doped fiber is on the DFB-FL rear end strengthens, and is 15-120cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202608324U CN201853936U (en) | 2010-07-16 | 2010-07-16 | Optical fiber device for blending optical fiber distribution feedback laser with optical fiber amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202608324U CN201853936U (en) | 2010-07-16 | 2010-07-16 | Optical fiber device for blending optical fiber distribution feedback laser with optical fiber amplifier |
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| CN201853936U true CN201853936U (en) | 2011-06-01 |
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| CN2010202608324U Expired - Lifetime CN201853936U (en) | 2010-07-16 | 2010-07-16 | Optical fiber device for blending optical fiber distribution feedback laser with optical fiber amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908708A (en) * | 2010-07-16 | 2010-12-08 | 山东大学 | Fiber device for fusing fiber distributed feedback (DFB) laser and fiber amplifier |
-
2010
- 2010-07-16 CN CN2010202608324U patent/CN201853936U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908708A (en) * | 2010-07-16 | 2010-12-08 | 山东大学 | Fiber device for fusing fiber distributed feedback (DFB) laser and fiber amplifier |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110601 Effective date of abandoning: 20120829 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20110601 Effective date of abandoning: 20120829 |