CN202351516U - Fiber grating reverse apodization device based on double-lens light beam shaping - Google Patents
Fiber grating reverse apodization device based on double-lens light beam shaping Download PDFInfo
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- CN202351516U CN202351516U CN2011205002236U CN201120500223U CN202351516U CN 202351516 U CN202351516 U CN 202351516U CN 2011205002236 U CN2011205002236 U CN 2011205002236U CN 201120500223 U CN201120500223 U CN 201120500223U CN 202351516 U CN202351516 U CN 202351516U
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Abstract
The utility model relates to a fiber grating reverse apodization device based on double-lens light beam shaping. For realizing pure apodization of a fiber grating in an ordinary apodization process, positive apodization and reverse apodization processes are required to be performed on the fiber grating. In the two processes, a diaphragm on a positive apodization template and a diaphragm on a reverse apodization template are required to be conjugated. In the prior art, a process for manufacturing a reverse apodization template which is strictly conjugated with the positive apodization template is complex and cannot reach requirements easily, so that pure apodization accuracy during manufacturing of an apodization fiber grating is limited. In a method disclosed by the utility model, two adjacent small cylinder lenses are arranged at an appropriate position between the positive apodization template and a cylinder lens in a bilateral symmetric way, the length directions of the small cylinder lenses are vertical to the length direction of the cylinder lens, and strictly-conjugated reverse apodization on the fiber grating which is subjected to positive apodization is realized, so that a method for using a reverse apodization template is eliminated, and the pure apodization accuracy is increased. The fiber grating reverse apodization device has high adaptability, high flexibility and a simple process.
Description
Technical field
The utility model belongs to the fiber grating manufacture technology field, is specifically related to the fiber grating traditional method of indicating the pronunciation of a Chinese character toe device based on the double lens beam shaping.
Background technology
Fiber grating (FBG) is a kind of new type light passive device; It has in light weight, advantages such as volume is little, reliability is high, anti-electromagnetic interference (EMI), the insertion loss is low, wavelength selectivity good, highly sensitive and measured scope is wide, thereby in optical fiber communication and Fibre Optical Sensor, has a wide range of applications.Its constructible device in optical fiber communication and Fibre Optical Sensor comprises: semiconductor laser, fiber amplifier, wave filter, WDM wavelength division multiplexer, fibre-optical grating compensator with dispersion, fiber Bragg grating strain sensor, temperature sensor, acceleration transducer, displacement transducer etc.
Realize above function, must produce the fiber grating of function admirable; Its production method is increasingly mature; Yet in the reflectance spectrum of even Fiber Bragg Grating FBG (FBG), an outstanding feature is arranged: except the principal reflection band of grating; Also have very big band external reflection, promptly its reflection secondary lobe is bigger.Reflection secondary lobe huge in the grating will inevitably have influence on adjacent wavelength, brings crosstalking between the adjacent optical channels, in sensor-based system, can be mistakened as unfavorable factors such as making transducing signal, the work that influence is actual.This difficult problem also becomes the bottleneck of fiber grating development, therefore, should manage to eliminate or suppress the reflection secondary lobe of fiber grating, makes the influence of reflection secondary lobe drop to minimum.
Research shows, the reflection secondary lobe of uniform fiber grating can adopt and cut toe (Apodizing) technology and suppress.It is exactly with some certain functions the index modulation amplitude of fiber grating to be modulated that what is called is cut toe.Grating after cutting toe is called cuts the toe fiber grating.Its effect is exactly the limit mould that suppresses fiber grating, makes fiber grating group delay curve smoothing.Typically cutting the toe envelope function has Gaussian function, Hamming function, this function of superelevation and cosine, raised cosine etc.At present the main toe technology of cutting has: ultraviolet pulse is relevant to be write and cuts toe, cuts that the toe phase mask is cut toe, evenly the phase place template combines scanning technique to cut toe and conjugation amplitude template is cut toe etc.Cut in the toe at fiber grating and it should be noted that: fiber grating must keep the mean refractive index of fibre core constant on length, could form the pure toe of cutting of fiber grating like this.If it is not constant that the mean refractive index on the fiber lengths changes, then grating will produce shortwave concussion effect, can have tangible secondary lobe at harmonic peak shortwave place, and it only is the tangent toe that grating is at this moment cut toe, so also need carry out traditional method of indicating the pronunciation of a Chinese character toe to it.
The gordian technique that conjugation amplitude template is cut toe is the design of conjugation template.Conjugation amplitude template is made up of tangent toe template and traditional method of indicating the pronunciation of a Chinese character toe template two parts.On the tangent toe template diaphragm be shaped as apodizing function (like Gaussian function), on the traditional method of indicating the pronunciation of a Chinese character toe template figure of diaphragm then with tangent toe template on the figure conjugation.Cut the toe process: ultraviolet light passes through tangent toe template, post lens and phase mask plate successively; On optical fiber, produce tangent toe fiber grating (Fig. 1 (a)); Then; Remove phase mask plate, replace the position of tangent toe template to carry out the traditional method of indicating the pronunciation of a Chinese character toe of fiber grating, thereby realize the pure toe of cutting of fiber grating with traditional method of indicating the pronunciation of a Chinese character toe template.
But the envelope of apodizing function is complicated, and the precision that toe is made is cut in very difficult assurance, especially can not guarantee two template conjugation.In addition, all to make the template of corresponding apodising diaphragm and respective length for the grating of different apodizing functions and different length, so improve cost greatly, reduce dirigibility.Yet,, need improve and improve the manufacturing technology of existing fiber grating optical device greatly, to satisfy the requirement of practical applications and scientific research because the wide application of fiber grating optical device reaches an urgent demand to the manufacturing technology of fiber grating optical device.
Summary of the invention
The purpose of the utility model is exactly: in order to overcome the difficult problem of conjugation template construct when the fiber grating conjugation amplitude template traditional method of indicating the pronunciation of a Chinese character toe; A kind of fiber grating traditional method of indicating the pronunciation of a Chinese character toe device based on the double lens beam shaping is provided; Improve when cutting the toe fiber grating in making and cut the toe precision, its apparatus structure is simple, it is flexible to cut toe.
The utility model is that the technical scheme that the technical solution problem is taked is:
Fiber grating traditional method of indicating the pronunciation of a Chinese character toe device based on the double lens beam shaping comprises ultraviolet laser, tangent toe template, two pillar lens, post lens, phase mask plate, optical fiber.
The center of ultraviolet laser, tangent toe template, post lens, phase mask plate, optical fiber arranges on a baseline successively; Optical fiber and phase mask plate right side are close to and are on the focal plane of post lens (Fig. 1 (a)); The distance that between tangent toe template and post lens, leaves the post lens is that the position left and right symmetrically of 2 times of the pillar focal lengths of lens is placed the length direction (Fig. 2) of the length direction of two adjacent pillar lens and pillar lens perpendicular to the post lens; Two pillar lens are just the same; Two pillar lens diameters are the half the of tangent toe template length; Two pillar length of lens equal the width of tangent toe template; The length of post lens is not less than the length of tangent toe template, and the diameter of post lens is not less than the width of tangent toe template; The position of ultraviolet laser, tangent toe template, post lens, optical fiber remains constant.
In the such scheme, this method specifically may further comprise the steps:
Shown in Fig. 1 (a), the ultraviolet light of process tangent toe template vertically compresses focusing through the post lens, sees through phase mask plate, on the optical fiber at its place, focal plane, makes public, thereby produces positive apodization grating.Shown in Fig. 1 (b); Remove phase mask plate; The distance that between tangent toe template and post lens, leaves the post lens is that the position left and right symmetrically of 2 times of the pillar focal lengths of lens is placed the length direction (position illustrate like Fig. 2) of the length direction of two adjacent pillar lens and pillar lens perpendicular to the post lens, and ultraviolet light is realized the traditional method of indicating the pronunciation of a Chinese character toe of positive apodization grating through the exposure on positive apodization grating of tangent toe template, two pillar lens, post lens.
Through the grating of tangent toe, the variation of its grid region mean refractive index is not a constant; Remove phase mask plate, thereby it is carried out the unevenness that traditional method of indicating the pronunciation of a Chinese character toe has been modulated the grid region mean refractive index.
The beneficial effect that the utility model had is: the distance that between tangent toe template and post lens, leaves the post lens is that the position left and right symmetrically of 2 times of the pillar focal lengths of lens is placed the length direction of the length direction of two pillar lens and pillar lens perpendicular to the post lens; After making the weak light in the strong both sides of original center section through two pillar lens its light distribution and original light distribution just in time conjugation be that both sides are strong a little less than its light intensity center section; So just can realize the fiber grating behind the tangent toe is carried out the traditional method of indicating the pronunciation of a Chinese character toe of strict conjugation, thereby save the process of using traditional method of indicating the pronunciation of a Chinese character toe template.Solve the difficult problem of conjugation template construct, also improved the precision and the quality of traditional method of indicating the pronunciation of a Chinese character toe grating simultaneously.This device is simple, in the making of apodization grating, can be widely used.
Description of drawings
Fig. 1 (a) is based on the fiber grating tangent toe device vertical view of double lens beam shaping.
Fig. 1 (b) overlooks index path based on the fiber grating traditional method of indicating the pronunciation of a Chinese character toe of double lens beam shaping.
The position view of two little plano-convex cylindrical lenses of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Shown in Fig. 1 (b), comprise ultraviolet laser 1, tangent toe template 2, two pillar lens 6 and 7, post lens 3, optical fiber 5 based on the fiber grating traditional method of indicating the pronunciation of a Chinese character toe device of double lens beam shaping.The center of ultraviolet laser 1, tangent toe template 2, post lens 3, optical fiber 5 arranges on a baseline successively; Between tangent toe template 2 and post lens 3 from the distance of post lens 3 be pillar lens 6 and 2 times of 7 focal lengths position two adjacent pillar lens 6 of left and right symmetrically placement and 7 and the length direction of pillar lens 6 and 7 perpendicular to the length direction of post lens 3; Two pillar lens 6 and 7 are just the same, and its diameter is the half the of tangent toe template 2 length, and its length equals the width of tangent toe template 2; The length of post lens 3 is not less than the length of tangent toe template 2, and the diameter of post lens 3 is not less than the width of tangent toe template 2; The position of ultraviolet laser 1, tangent toe template 2, post lens 3, optical fiber 5 remains constant.
The working method of the utility model is: ultraviolet light that ultraviolet laser sends has produced at 2 times of focal length places of pillar lens after through tangent toe template and two pillar lens and the distribute light of strict conjugation of original ultraviolet light intensity; The light that sees through two pillar lens incides the post lens, thus through the post lens vertically compression focus on the fiber grating and fiber grating carried out traditional method of indicating the pronunciation of a Chinese character toe through the row exposure.This device placement through two pillar lens has just been realized with the strict conjugation of original light intensity.
The utility model method realizes the fiber grating behind the tangent toe is carried out the traditional method of indicating the pronunciation of a Chinese character toe of strict conjugation; Gordian technique is; Distance from the post lens between tangent toe template and post lens is two adjacent pillar lens of position left and right symmetrically placement of 2 times of the pillar focal lengths of lens, and the length direction of pillar lens is perpendicular to the length direction of post lens; Two pillar lens are just the same, and two pillar lens diameters are the half the of tangent toe template length; Two pillar length of lens equal the width of tangent toe template; By Fig. 1 (b) light path can know its light distribution after the weak light in the strong both sides of original light intensity center section is through two pillar lens and original light distribution just in time conjugation be that both sides are strong a little less than its light intensity center section, thereby produced the traditional method of indicating the pronunciation of a Chinese character toe light intensity with the strict conjugation of tangent toe light intensity.
In the present embodiment, the centre wavelength of ultraviolet light is 193nm; Little plano-convex cylindrical lens 6 and 7 long 5.4cm diameter 3.0cm, focal length 12.5cm; Plano-convex cylindrical lens 3 long 6.0cm diameter 5.4cm, focal length 45cm; Little plano-convex cylindrical lens 6 and 7 and the distance of plano-convex cylindrical lens 3 be 25cm; Plano-convex cylindrical lens 3 is 45cm with the distance of optical fiber 5; Apodizing function is a Gaussian function.
Claims (1)
1. the fiber grating traditional method of indicating the pronunciation of a Chinese character toe device based on the double lens beam shaping comprises ultraviolet laser, tangent toe template, two pillar lens, post lens, optical fiber, it is characterized in that: the center of ultraviolet laser, tangent toe template, post lens, optical fiber arranges on a baseline successively; The distance that between tangent toe template and post lens, leaves the post lens is that the position left and right symmetrically of 2 times of the pillar focal lengths of lens is placed the length direction of the length direction of two adjacent pillar lens and pillar lens perpendicular to the post lens; Two pillar lens are just the same, and its diameter is the half the of tangent toe template length, and its length equals the width of tangent toe template; The length of post lens is not less than the length of tangent toe template, and the diameter of post lens is not less than the width of tangent toe template; The position of ultraviolet laser, tangent toe template, post lens, optical fiber remains constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205002236U CN202351516U (en) | 2011-11-29 | 2011-11-29 | Fiber grating reverse apodization device based on double-lens light beam shaping |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205002236U CN202351516U (en) | 2011-11-29 | 2011-11-29 | Fiber grating reverse apodization device based on double-lens light beam shaping |
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| CN202351516U true CN202351516U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205002236U Withdrawn - After Issue CN202351516U (en) | 2011-11-29 | 2011-11-29 | Fiber grating reverse apodization device based on double-lens light beam shaping |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402007A (en) * | 2011-11-29 | 2012-04-04 | 杭州恒川科技有限公司 | Negative apodization technique for fiber grating based on double-lens beam shaping |
| CN105182545A (en) * | 2015-08-26 | 2015-12-23 | 北京国科世纪激光技术有限公司 | Laser device |
-
2011
- 2011-11-29 CN CN2011205002236U patent/CN202351516U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402007A (en) * | 2011-11-29 | 2012-04-04 | 杭州恒川科技有限公司 | Negative apodization technique for fiber grating based on double-lens beam shaping |
| CN102402007B (en) * | 2011-11-29 | 2013-10-30 | 杭州恒川科技有限公司 | Negative apodization technique for fiber grating based on double-lens beam shaping |
| CN105182545A (en) * | 2015-08-26 | 2015-12-23 | 北京国科世纪激光技术有限公司 | Laser device |
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| 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: 20120725 Effective date of abandoning: 20131030 |
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| RGAV | Abandon patent right to avoid regrant |