CN102122023A - Method for manufacturing tunable chirped fiber grating - Google Patents
Method for manufacturing tunable chirped fiber grating Download PDFInfo
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- CN102122023A CN102122023A CN 201110093327 CN201110093327A CN102122023A CN 102122023 A CN102122023 A CN 102122023A CN 201110093327 CN201110093327 CN 201110093327 CN 201110093327 A CN201110093327 A CN 201110093327A CN 102122023 A CN102122023 A CN 102122023A
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Abstract
The invention discloses a method for manufacturing a tunable chirped fiber grating. The method manufactures the fiber grating based on optical fiber doped in rare earth element, couples pump light into the manufactured fiber grating, and changes the refractive index of the fiber grating via a temperature gradient formed by the pump light in the fiber grating so as to convert the routine fiber grating into the chirped fiber grating. Furthermore, the method changes the refractive index of the temperature gradient field and the fiber grating by changing the power of the coupled pump light in order to implement the tunable characteristics of the chirped fiber grating and realize the tunable chirped fiber grating based on a light tuning mode. Compared with the prior art, the method in the invention is simple in process, stable in process, low in cost and quick in response speed.
Description
Technical field
The present invention relates to fiber grating and make field, the particularly method for making of tunable chirped fiber grating.
Background technology
Tunable chirped fiber grating is a kind of important fiber optic components, be the core parts of realizing important devices such as adjustable chromatic dispersion compensator spare, bandwidth adjustable light wave-filter, variable light lag line, in various optical fiber communications and fiber optics equipment, have widely and use, typical application comprises the dispersion compensation in the optical fiber telecommunications system, vairable delay line of radar array etc. in the military affairs, market outlook are wide.
The conventional method for making of fiber grating has multiple, and wherein method for making and the technology with uniform fiber grating is the most ripe, and with low cost.On the contrary, chirped fiber grating is made and is also lacked core technology at present, the method for making complexity, and technology is hard to tackle, and cost is higher.
The realization of chirped fiber grating generally can realize a refractive index gradient, thereby change a uniform fiber grating into chirped fiber grating by changing the fiber core refractive index of optical fiber in fibre core.The realization of tunable chirped fiber grating needs then to make that this refractive index gradient is tunable.Because optical fibre refractivity depends on temperature and stress, therefore can realize in fiber core that a tunable temperature or stress gradient realize tunable refractive index gradient.Because temperature and stress can be regulated by external unit, such as optical fiber being placed a temperature control device or optical fiber being pushed, draws high to wait and grant stress, change the stress that temperature or change apply, can change the refractive index of fibre core, thereby realize tunable chirped fiber grating.
Aspect tunable chirped fiber grating exploitation, carried out multiple trial.Because stress gradient is not easy to realize, and excessive stress has damage to optical fiber, and therefore most schemes all are based on the scheme of tunable thermograde.For example, document " Adjustable dispersion-compensation devices with wavelength tunability based on enhanced thermal chirped of fiber Bragg gra
Document " Tunable dispersion equalizer with a divided thin-film heater for 40-Gb/s RZ transmissions; " (S.Matsumoto, T.Ohira, M.Takabayashi, K.Yoshiara, and T.Sugihara, IEEE Photon.Technol.Lett., vol.13, No.8, pp.827-829 Aug.2001.) has described a kind of tunable chirped fiber grating based on the sectional type thin film heater.This scheme need be at 32 thin film heaters on the optical fiber surface deposition, by each thin film heater being controlled come tuning Temperature Distribution.Though chirped fiber grating response speed that this class is tunable is made difficulty than very fast, controls also more complicated.
People such as Jiang Dianjie, Chen Xiangfei had proposed to use warble the sample period (CSP) by sampled-grating to obtain the chirp grating cycle (CGP) of equivalence and adopt the precision optical machinery device to realize tuning method in " the design and fabrication method of adjustable chromatic dispersion compensator " Chinese invention patent (application number 200410000339.8) in 2004.This employing precision optical machinery device comes tuning method, costs an arm and a leg, and volume is bigger, has limited its application to a certain extent.The thermal effect that people such as Sun Jie, Dai Yitang has produced when having proposed to utilize electric current to pass through the coat of metal in " the nonlinearly chirped fiber grating method for making that the 40G/s optical communication system is used " Chinese invention patent (license notification number CN200610011411.6) realizes the method for the tunability of fiber grating.But this method need be on optical fiber metal-coated membrane, steps such as extraction electrode, the manufacture craft difficulty is bigger, making apparatus is also comparatively expensive, its application also is subjected to a certain degree limiting.In addition, the tuned speed that these methods realized is all slow, is difficult to satisfy some needs tuning application scenario fast.
Summary of the invention
In order to overcome the deficiencies in the prior art, the purpose of this invention is to provide a kind of method for making of the tunable chirped fiber grating based on magic eye.
Purpose of the present invention is achieved through the following technical solutions: a kind of method for making of tunable chirped fiber grating may further comprise the steps:
(1) uses rear-earth-doped optical fiber fabrication fiber grating.
(2) pumping laser that the pumping laser light source is produced by optical fiber coupling device is coupled into the fiber grating that step (1) is made; Pumping laser produces the thermograde that descends gradually along the laser propagation direction in fiber grating; Refractive index by this thermograde change fiber grating forms refractive index gradient in fiber grating, obtain chirped fiber grating;
(3) power of change pumping laser light source, temperature gradient field in the fiber grating and refractive index gradient field also change thereupon, realize the tunability of chirped fiber grating, obtain tunable chirped fiber grating.
Preferably, described step (1) is used rear-earth-doped optical fiber fabrication fiber grating, specifically comprises following process: use 193nm Ultra-Violet Laser irradiation mask plate, optical fiber is inscribed, obtain uniform fiber grating.
Preferably, in the described process that optical fiber is inscribed, use wideband light source and spectrometer to monitor the inscription effect of fiber grating in real time, use the optoisolator protection spectrometer of 1550nm wave band.
Preferably, optical fiber coupling device is a wavelength division multiplex device described in the described step (2).
Preferably, described pumping laser is the pumping laser of 980nm wave band.
Preferably, use the pumping laser light source of the described 980nm wave band of light insulation blocking of 980nm wave band.
Preferably, the described rear-earth-doped optical fiber optical fiber that is Er, Yb codope.
The present invention is based in the rare earth doped optical fiber and make fiber grating, pump light is coupled into the fiber grating of making, the temperature gradient field that utilizes pump light to form in fiber grating changes the refractive index of fiber grating, thereby change the conventional fiber grating into chirped fiber grating, simultaneously, the pumping light power that is coupled into by change changes the temperature gradient field in the fiber grating and the refractive index of fiber grating, thereby realize the tunable characteristic of chirped fiber grating, realize tunable chirped fiber grating based on the magic eye mode.
The present invention has the following advantages and technique effect with respect to prior art:
1, the manufacture craft that adopted when making fiber grating of the present invention can be selected the fiber grating manufacture craft of any routine for use, conventional fiber grating manufacture craft is full-fledged stable, with low cost, but thereby reduced the production cost of chirp grating, and has the advantage of process stabilizing.
2, when realizing chirped fiber grating, it or not the method that adopts the making parameter that designs fiber grating in advance, inject pumping laser to rear-earth-doped fiber grating but adopt, formation temperature gradient in fiber grating, because the refractive index of fiber grating is relevant with temperature linearity, the thermograde that forms in the fiber grating has caused the formation of refractive index gradient, thereby uniform fiber grating can be transformed into chirped fiber grating, overcome the problem of existing chirped fiber grating complex manufacturing technology.
3, when carrying out the tunability process of chirped fiber grating, not to adopt the adjusting additional equipment to come fiber grating is granted variable applied stress or temperature, regulate the pumping laser luminous power but adopt, changing the fiber grating temperature inside distributes, thereby realization tunability, overcome complicated operation, cost height, the slow problem of response speed of the tunable process of existing realization chirped fiber grating, it is simple to have technology, process stabilizing, with low cost, advantage that response speed is fast.
Description of drawings
Fig. 1 is the process flow diagram of the method for making of tunable chirped fiber grating of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the method for making of tunable chirped fiber grating of the present invention may further comprise the steps:
(1) the optical fiber fabrication uniform fiber grating of use Er, Yb codope, detailed process is as follows:
Use 193nm Ultra-Violet Laser irradiation mask plate; optical fiber is inscribed, obtained uniform fiber grating, in the process that optical fiber is inscribed; use wideband light source and spectrometer to monitor the inscription effect of fiber grating in real time, use the optoisolator protection spectrometer of 1550nm wave band.
(2) pumping laser with the 980nm wave band is coupled into the fiber grating that step (1) is made by wavelength division multiplex device; Pumping laser produces the thermograde that descends gradually along the laser propagation direction in fiber grating; Refractive index by this thermograde change fiber grating forms refractive index gradient in fiber grating, obtain chirped fiber grating; Described refractive index gradient field can be calculated by following formula:
Wherein, Δ n (z) is the optical fibre refractivity variation along the pumping laser direction of propagation, and dn/dT is the intrinsic refractive index-temperature factor of optical fiber, and η is that pumping laser is absorbed the ratio that changes heat into by optical fiber, and ρ is the density of optical fiber, c
vBe the feature thermal capacity of optical fiber, P
P(0) is the emission luminous power of pumping laser, α
PBe the attenuation coefficient of pumping laser in the doped fiber, z is the propagation distance of pumping laser.
(3) power of change pumping laser light source, temperature gradient field in the fiber grating and refractive index gradient field also change thereupon, realize the tunability of chirped fiber grating, obtain tunable chirped fiber grating.
The present invention is based on rare earth doped optical fiber, and the manufacture craft that is adopted when making fiber grating can be selected the fiber grating manufacture craft of any routine for use.In the process that realizes chirped fiber grating, adopt and inject pumping laser, formation temperature gradient in fiber grating to fiber grating.Because the refractive index of fiber grating is relevant with temperature linearity, the thermograde that forms in the fiber grating has caused the formation of refractive index gradient, thereby a uniform fiber grating can be transformed into a chirped fiber grating.In the tunable process that realizes fiber grating, the present invention adopts to regulate and injects the pumping laser optical power, changes the fiber grating temperature inside and distributes, thereby realize tunability.The fiber grating method for making that the technical maturity that the method for making of tunable chirped fiber grating of the present invention adopts in manufacturing process is stable, with low cost, the tunable chirped fiber grating that obtains also have tuning advantage fast.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. the method for making of a tunable chirped fiber grating is characterized in that, may further comprise the steps:
(1) uses rear-earth-doped optical fiber fabrication fiber grating;
(2) pumping laser that the pumping laser light source is produced by optical fiber coupling device is coupled into the fiber grating that step (1) is made; Pumping laser produces the thermograde that descends gradually along the laser propagation direction in fiber grating; Refractive index by this thermograde change fiber grating forms refractive index gradient in fiber grating, obtain chirped fiber grating;
(3) power of change pumping laser light source, temperature gradient field in the fiber grating and refractive index gradient field also change thereupon, realize the tunability of chirped fiber grating.
2. the method for making of a kind of tunable chirped fiber grating according to claim 1, it is characterized in that, described step (1) is used rear-earth-doped optical fiber fabrication fiber grating, specifically comprise following process: use 193nm Ultra-Violet Laser irradiation mask plate, optical fiber is inscribed, obtained uniform fiber grating.
3. the method for making of a kind of tunable chirped fiber grating according to claim 2; it is characterized in that; in the described process that optical fiber is inscribed, use wideband light source and spectrometer to monitor the inscription effect of fiber grating in real time, use the optoisolator protection spectrometer of 1550nm wave band.
4. the method for making of a kind of tunable chirped fiber grating according to claim 1 is characterized in that, optical fiber coupling device is a wavelength division multiplex device described in the described step (2).
5. the method for making of a kind of tunable chirped fiber grating according to claim 1 is characterized in that, described pumping laser is the pumping laser of 980nm wave band.
6. the method for making of a kind of tunable chirped fiber grating according to claim 5 is characterized in that, uses the pumping laser light source of the described 980nm wave band of light insulation blocking of 980nm wave band.
7. according to the method for making of each described a kind of tunable chirped fiber grating of claim 1～6, it is characterized in that described rear-earth-doped optical fiber is the optical fiber of Er, Yb codope.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616742A (en) * | 2013-12-11 | 2014-03-05 | 李智忠 | Method for fabricating chirped fiber grating |
| CN105785502A (en) * | 2016-04-22 | 2016-07-20 | 哈尔滨理工大学 | Device for generating chirped Brillouin dynamic grating |
| CN112068240A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Long-period chirped fiber grating and preparation method thereof |
| CN112068238A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Single stress element optical fiber chirped fiber Bragg grating and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2302986A1 (en) * | 2000-03-16 | 2000-07-04 | Brian Robert West | Tunable fibre grating dispersion compensation device |
| CN1651949A (en) * | 2005-03-01 | 2005-08-10 | 暨南大学 | Controllable cascade type optical fiber raster DWDM single / multi-channel filter and its implementing method |
| CN101478112A (en) * | 2009-01-06 | 2009-07-08 | 广州中国科学院工业技术研究院 | Optical fiber laser pump protecting apparatus and method |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2302986A1 (en) * | 2000-03-16 | 2000-07-04 | Brian Robert West | Tunable fibre grating dispersion compensation device |
| CN1651949A (en) * | 2005-03-01 | 2005-08-10 | 暨南大学 | Controllable cascade type optical fiber raster DWDM single / multi-channel filter and its implementing method |
| CN101478112A (en) * | 2009-01-06 | 2009-07-08 | 广州中国科学院工业技术研究院 | Optical fiber laser pump protecting apparatus and method |
Non-Patent Citations (1)
| Title |
|---|
| 《电子测量与仪器学报》 20040331 王巍 等 基于NPS的集成光学型光隔离器的研究 全文 1-7 第18卷, 第1期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616742A (en) * | 2013-12-11 | 2014-03-05 | 李智忠 | Method for fabricating chirped fiber grating |
| CN103616742B (en) * | 2013-12-11 | 2015-06-17 | 李智忠 | Method for fabricating chirped fiber grating |
| CN105785502A (en) * | 2016-04-22 | 2016-07-20 | 哈尔滨理工大学 | Device for generating chirped Brillouin dynamic grating |
| CN105785502B (en) * | 2016-04-22 | 2018-11-06 | 哈尔滨理工大学 | A kind of device generating chirp Brillouin's dynamic raster |
| CN112068240A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Long-period chirped fiber grating and preparation method thereof |
| CN112068238A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Single stress element optical fiber chirped fiber Bragg grating and preparation method thereof |
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Application publication date: 20110713 |