CN100476475C - Producing method for multiple cascade fibre-optical raster - Google Patents
Producing method for multiple cascade fibre-optical raster Download PDFInfo
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- CN100476475C CN100476475C CNB031383610A CN03138361A CN100476475C CN 100476475 C CN100476475 C CN 100476475C CN B031383610 A CNB031383610 A CN B031383610A CN 03138361 A CN03138361 A CN 03138361A CN 100476475 C CN100476475 C CN 100476475C
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Abstract
In the method, optical fibre cladding layer is etched to be multisection in stairway form first and then axial stress is imposed onto optical fibre, grating is prepared by using ultraviolet ray source to shine optical fibre according to conventional preparation method of optical fibre so grating end with multiple different period is formed on the same optical fibre when axial stress is withdrawn and connections between various cascade optical fibre grating are smooth and seamless. The method is based on principle of dependent variable of optical fibre is different according to various optical cladding diameter under action of axial stress.
Description
Technical field
The present invention relates to the method for making of the optical device that uses in a kind of optical fiber communication and the sensory field of optic fibre, particularly about a kind of method for making of a plurality of cascade fiber gratings.
Background technology
Fiber grating is a kind of optical device that directly is produced in the fiber core, since it have with the optical fiber ease of connection, insert loss little, to polarization insensitive, small volume structure compactness, cost is low and make remarkable advantages such as simple, therefore has been the focus of optical communication field research since the nineties from last century always.No matter the analysis theories of fiber grating or the technology of making and technology are all quite ripe at present, people can produce various fiber grating as requested, such as various toe fiber grating, chirped fiber grating, the sampled fiber gratings etc. cut.Along with close wavelength-division multiplex technology being extensive use of of fiber optic communication field, optical-fiber network is just towards the direction develop rapidly of high capacity, long distance, intellectuality and all optical network.Currently need high optical filter of the ratio of performance to price and dispersion compensator in a large number, and uniform fiber grating and chirped fiber grating just in time can satisfy this demand.Simultaneously, because fiber grating is to some environment parameters relatively responsive (as temperature, axial strain and lateral stress etc.), so fiber grating has also obtained using widely at sensory field.In sum, fiber grating has become a very important optical device in optical fiber communication and the sensory field of optic fibre as can be seen.
In a lot of practical applications,, often need a plurality of fiber gratings such as making multi-wavelength optical fiber laser, a plurality of channels being carried out filtering or a plurality of channels are carried out dispersion compensation.At present, mainly contain two kinds of methods and address that need: the one, with the use that cascades up of a plurality of fiber gratings; The 2nd, adopt sampled fiber grating.The shortcoming of first kind of scheme is conspicuous, a plurality of fiber grating cascades uses have not only improved cost, have increased the complicacy of inserting loss, having increased operation, and because the parameter difference of each fiber grating, such as inserting loss, band internal reflection rate, reflection bandwidth etc., will make the mis-behave of whole cascade device.Second kind of scheme can be made a plurality of fiber gratings easily simultaneously, but it needs special template, as positive and negative mask plate, so in addition owing to adopted the method optical fiber utilization factor of sampling to reduce.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide and a kind ofly can realize seamless cascade, and can not introduce the additional method for making of inserting a plurality of cascade fiber gratings of loss.
For achieving the above object, the technical solution used in the present invention is: a kind of method for making of a plurality of cascade fiber gratings, it is characterized in that: the multistage that the covering of light-sensitive optical fibre is corroded into the stepped variation of diameter by the covering corrosion technology, in the fiber grating process that adopts ultraviolet source to a plurality of cascades of light-sensitive optical fibre irradiation making, light-sensitive optical fibre is applied axial tension stress.
In adopting the fiber grating process of ultraviolet source, use the phase mask method to a plurality of cascades of fiber-optic illuminated making.
In adopting the fiber grating process of ultraviolet source, use point-to-point writing method to a plurality of cascades of fiber-optic illuminated making.
In adopting the fiber grating process of ultraviolet source, use double beam interferometry to a plurality of cascades of fiber-optic illuminated making.
Ultraviolet source comprises all light sources of 100nm～500nm ultraviolet light wave band.
Described light-sensitive optical fibre is the optical fiber that described optical fiber self has photosensitivity.
Described light-sensitive optical fibre be described optical fiber self do not have photosensitivity or photosensitivity a little less than, the optical fiber that obtains by the method that strengthens photosensitivity.
The present invention is owing to take above design, it has the following advantages: 1, the present invention utilizes the cladding diameter difference, optical fiber is the different principle of dependent variable under the effect of axial stress, at first fibre cladding is corroded into the multistage of stepped variation, then optical fiber is applied axial stress, adopt the method for making of ordinary optic fibre grating, with ultraviolet source optical fiber is shone the making grating, thereby after axial stress is removed, different a plurality of grating sections of formation cycle on same optical fiber, reached the purpose of on same optical fiber, making a plurality of cascade fiber gratings, and the connection between each cascade is smooth, and is seamless, and the parameter of each fiber grating is good, as depth of modulation, band internal reflection rate, delay character etc., the performance ideal.2, the inventive method is easy to implement, controls easily, need not specific installation and technology, and the interval of each fiber grating centre wavelength can be controlled easily by cladding diameter, it is compared with the method for making of sampled fiber grating, use common templates just can achieve the goal, its cost of manufacture and manufacture difficulty all reduce significantly, and the present invention can be widely used in optical fiber communication and sensory field of optic fibre.
Description of drawings
Fig. 1 is the fibre cladding longitudinal profile synoptic diagram after the present invention handles
Fig. 2 is that the present invention makes optic fibre force synoptic diagram in the fiber grating process of a plurality of cascades
Embodiment
As shown in Figure 1, the present invention is at first by the fibre cladding corrosion technology, and the covering 2 of optical fiber 1 is corroded into the different multistage of diameter.Wherein, every segment length and cladding diameter will determine jointly according to the length of phase mask, the fiber grating number of needs and the interval of desired each fiber grating centre wavelength.
Then, as shown in Figure 2, optical fiber 1 two ends are fixed with optic fibre clamp 3, attention will become optical fiber 1 part of multistage to place between two clamp devices 3 through the covering corrosion treatment, be located at the zone that can be shone by ultraviolet source 4, and optical fiber 1 is applied suitable axial tensile stress.Because each different section of covering 2 diameters, sectional area is also inequality, and therefore the stretch amount of each section also is different under the effect of same stretch stress.
Then, with the phase mask 5 of ultraviolet source 4 irradiation making fiber gratings, will on irradiated optical fiber 1, make an identical fiber grating of grating cycle.After optical fiber 1 taken off from clamp device 3, optical fiber 1 will shrink the state that is returned to before the stress application.Because different each section stretch amount difference of covering 2 diameters, so the amount of contraction of corresponding each section is also just different, so just make the grating cycle that each section is identical under the drawing stress effect become no longer identical, its concrete size is relevant with corresponding cladding diameter, diameter is thin more, stretch amount is big more, and the contraction back grating cycle is short more, otherwise long more.Each different section of covering 2 diameters all is equivalent to a fiber grating for every section, and after the annealed processing, the different multistage of these covering 2 diameters has just formed the fiber grating of a plurality of cascades.And these fiber gratings are seamless cascades, it is different from common a plurality of fiber grating cascade together, because the variation of stress is continuous, and can not form stair-stepping variation along with stair-stepping covering, thereby the variation in fiber grating cycle also is continuous between each cascade.
In the foregoing description, in theory, being applied to optical fiber 1 axial tension stress also can be compressive stress, but it implements and acquires a certain degree of difficulty, and generally adopts relatively reality of axial tension stress.
In the foregoing description, ultraviolet source 4 comprises all light sources of 100nm～500nm ultraviolet light wave band, making in the method for fiber grating of ultraviolet source 4 irradiations, except that using the phase mask method, can also adopt double beam interferometry, point-to-point writing method etc.
Optical fiber 1 adopts light-sensitive optical fibre, and light-sensitive optical fibre is included in to make and makes the optical fiber that himself has photosensitivity in the optical fiber process, be also included within and make the optical fiber that does not have or have very weak photosensitivity in the optical fiber process, these optical fiber can make it become the optical fiber with big photosensitivity by the method (handling as carrying hydrogen) that strengthens photosensitivity.
In the foregoing description, the caustic solution of covering, method, the optical fiber of making fiber grating by ultraviolet source irradiation strengthen photosensitive method and are mature technology, just no longer describe in detail at this.
Claims (7)
1, a kind of method for making of a plurality of cascade fiber gratings, it is characterized in that: the multistage that the covering of light-sensitive optical fibre is corroded into the stepped variation of diameter by the covering corrosion technology, in the fiber grating process that adopts ultraviolet source to a plurality of cascades of light-sensitive optical fibre irradiation making, light-sensitive optical fibre is applied axial tension stress.
2, the method for making of a plurality of cascade fiber gratings as claimed in claim 1 is characterized in that: in adopting the fiber grating process of ultraviolet source to a plurality of cascades of fiber-optic illuminated making, use the phase mask method.
3, the method for making of a plurality of cascade fiber gratings as claimed in claim 1 is characterized in that: in adopting the fiber grating process of ultraviolet source to a plurality of cascades of fiber-optic illuminated making, use point-to-point writing method.
4, the method for making of a plurality of cascade fiber gratings as claimed in claim 1 is characterized in that: in adopting the fiber grating process of ultraviolet source to a plurality of cascades of fiber-optic illuminated making, use double beam interferometry.
5, as the method for making of claim 1 or 2 or 3 or 4 described a plurality of cascade fiber gratings, it is characterized in that: ultraviolet source comprises all light sources of 100nm～500nm ultraviolet light wave band.
6, the method for making of a plurality of cascade fiber gratings as claimed in claim 5 is characterized in that: described light-sensitive optical fibre is the optical fiber that described optical fiber self has photosensitivity.
7, the method for making of a plurality of cascade fiber gratings as claimed in claim 5 is characterized in that: described light-sensitive optical fibre be described optical fiber self do not have photosensitivity or photosensitivity a little less than, the optical fiber that obtains by the method that strengthens photosensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031383610A CN100476475C (en) | 2003-05-28 | 2003-05-28 | Producing method for multiple cascade fibre-optical raster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031383610A CN100476475C (en) | 2003-05-28 | 2003-05-28 | Producing method for multiple cascade fibre-optical raster |
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| CN1553238A CN1553238A (en) | 2004-12-08 |
| CN100476475C true CN100476475C (en) | 2009-04-08 |
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| CNB031383610A Expired - Fee Related CN100476475C (en) | 2003-05-28 | 2003-05-28 | Producing method for multiple cascade fibre-optical raster |
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| US8351029B2 (en) * | 2007-12-06 | 2013-01-08 | Mitsubishi Electric Corporation | Optical fiber sensor |
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Non-Patent Citations (2)
| Title |
|---|
| 用布拉格光纤栅制作啁啾光纤光栅. 韦占雄，秦莉，韦欣，王庆亚，郑伟，张玉书.光学学报，第19卷第11期. 1999 |
| 用布拉格光纤栅制作啁啾光纤光栅. 韦占雄，秦莉，韦欣，王庆亚，郑伟，张玉书.光学学报，第19卷第11期. 1999 * |
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