CN1397813A - Process for preparing high-chip optical fibre raster with controllable transmission (reflection) - Google Patents
Process for preparing high-chip optical fibre raster with controllable transmission (reflection) Download PDFInfo
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- CN1397813A CN1397813A CN 02129307 CN02129307A CN1397813A CN 1397813 A CN1397813 A CN 1397813A CN 02129307 CN02129307 CN 02129307 CN 02129307 A CN02129307 A CN 02129307A CN 1397813 A CN1397813 A CN 1397813A
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Abstract
A process for preparing transmission (or reflection)-type controllable high-chirp optical-fibre raster includes preparing more rasters on an optical fibre by scan writing method with different exposing intensities, measuring and recording the relation between exposing intensity and transmissivity (or reflectivity), creating database, calculating the ralation between the exposing intensity and the transmissivity needed by user according user requirement, and preparing the said raster by scan writing method and controlling the exposing time.
Description
Technical field
(instead) method for making of penetrating the controlled high-chip fiber grating of shape belongs to the fiber grating manufacture technology field thoroughly.
Background technology
The phase mask method has been simplified the manufacture difficulty of fiber grating greatly, has improved development efficient.It is to the coherence of light source and not high to the stability requirement of experimental provision, but the grating cycle of making will be determined by the cycle on the template.When the cycle on the template kept invariable, what obtain under the abundant conditions of exposure of ultraviolet was uniform fiber grating, and it has only a centre wavelength, and bandwidth is also narrower, was about 0.1 to 0.3nm; And the cycle on template is a situation about changing, and what obtain behind uv-exposure is chirped fiber grating, and its saturating (instead) penetrated the wide broad of bands of a spectrum, comprises a series of different wave lengths.Usually the bandwidth of chirped fiber grating between the 5nm, when its bandwidth surpasses 10nm, can be described as the high-chip fiber grating at 0.5nm.The scanning wrting method that employing proposes in conjunction with the characteristics of phase mask method and argon ion frequency multiplication continuous wave laser can be made various types of fiber gratings easily and flexibly.Its experimental provision as shown in Figure 1.Among the figure: frequency multiplication Ar+ ion laser 244nm light source is radiated on the phase mask 3 through the catoptron 2 of scanner 1, catoptron 2 is placed on the scanning translation stage of variable-ratio motion, optical fiber 4 is close to phase mask 3, and broad spectrum light source and spectral investigator are used for monitoring in real time in the manufacturing process saturating (instead) of grating and penetrate spectrum change.When scanning translation stage drive catoptron 2 moves in the mode of different speed or diverse location stop different time, the position of suffered uv-exposure point also changes thereupon and makes optical fiber 4 be subjected in various degree ultraviolet photoetching amount at diverse location on the optical fiber 4, thereby can make various types of fiber gratings easily and flexibly.But this method can not be composed the difference of shape according to the wave filter that the user provided, and designs flexibly and easily and change manufacturing conditions to obtain required grating device.
Summary of the invention
The purpose of this invention is to provide a kind of (instead) penetrates the method for making of the controlled high-chip fiber grating of shape and comes need make various types of fiber gratings according to the user neatly.
The invention is characterized in that it contains following steps successively:
(1) with the corresponding optical fiber of specific wavelength on the effective length scope in different exposure intensities promptly when light source output power is constant, make continuously by above-mentioned scanning wrting method in the different residence time of catoptron and obtain many gratings;
(2) measure and note the promptly corresponding residence time of above-mentioned various exposure intensity and this effective length interior (instead) thoroughly and penetrate rate one-to-one relationship numerically.This relation all is suitable for for any wavelength in the whole grating bandwidth, sets up database in view of the above;
(3) the filter transmission spectrogram that obtains according to user's needs, the manufacturing conditions that obtains making the required grating of user:
(3.1) at known grating length L, grating periods lambda, template chirp coefficient cg
1With optical fiber effective refractive index n
EffCondition under, the filter transmission spectrogram that provides according to the user with following formula calculates the corresponding relation of the template scanning position z of wavelength X:
λ=2
*n
Eff *(Λ+cg
1Z), wherein-L/2≤z≤L/2;
(3.2) utilize according to saturating (instead) rate of penetrating in the given filter transmission spectrogram of user that method of interpolation is counter from above-mentioned database to check in reflectivity and coupling coefficient is the relation of exposure intensity;
(3.3) obtain along the distribution situation of grating length direction exposure intensity by step (3.1), (3.2), promptly under the condition of given exposure, the relation of the residence time on this position of the catoptron on template scanning position z and the scanner;
(4) manufacturing conditions that obtains according to step (3) is produced the fiber grating of required spectrum shape with above-mentioned scanning wrting method.
Described catoptron is done diverse location and is taked the stoppage in transit of walking of the different residence time to move under the control of scanning mobile platform.It has reached intended purposes to use proof.
Description of drawings
Fig. 1. fiber grating scanning writing station synoptic diagram.
Fig. 2. the process flow diagram of the method for making that the present invention proposes.
Fig. 3. the program flow chart of the method for making that the present invention proposes.
Wherein Length makes grating length, dl=grating length/spectrum segments.
Fig. 4. the filter transmission spectrogram that the user provides and need obtain.
Fig. 5. utilize the synoptic diagram that concerns of method of interpolation inquiry reflectivity and coupling coefficient.
Fig. 6. coupling coefficient is with the distribution plan of grating length direction.
Fig. 7. wave filter spectrogram needed and that calculate compares.
Embodiment
Penetrate the design of spectral shape and need know in advance owing in big bandwidth range, realize grating saturating (instead), on technology is made, just can be equivalent to the difference that is controlled at suffered exposure intensity on the grating diverse location along the distribution situation of the coupling coefficient of grating length direction.The specific design thinking that proposes according to this inventive concept can be summarized as follows: because chirp grating, it is corresponding that every bit place exposure intensity and respective wavelength place saturating (instead) penetrates the rate size on the grating.And the broader bandwidth of high-chip grating, therefore it is very little in fact to penetrate its action length scope of contribution of rate at certain single wavelength saturating (instead), much smaller than the overall optical gate length.Thereby we have proposed the notion of an effective length is that it is one such and the corresponding grating length of specific wavelength, and all length is just very little above the grating exposed portion outside this specific wavelength length range is penetrated rate to saturating (instead) of this certain wave strong point contribution.Thereby, can select a wavelength, study its saturating (instead) penetrate rate on the effective length scope with the relation of exposure intensity, then this relation is generalized in the whole grating bandwidth on any wavelength, thereby can obtains the distribution situation of the exposure intensity on the grating length direction.Make required grating filter according to this known distribution then.Its specific practice is: with the experimental provision of Fig. 1, make many gratings changing under the condition that exposure promptly changes the different residence time, measure catoptron 2 phase mask 3 corresponding in the effective length interval range of a specific wavelength saturating (instead) radiance rate value, thereby can draw the residence time also be the exposure size and thoroughly (instead) penetrate the one-to-one relationship of rate size.Owing to also be suitable in the effective length interval range of this relation for other wavelength place, can make database in view of the above.When concrete the making, just can provide and needs obtain saturating (instead) rate of penetrating on the filter transmission spectrogram as shown in Figure 4 inquires required exposure intensity shown in Figure 5 from database size and manufacturing conditions according to the user; Approximate size and the manufacturing conditions that obtains required exposure intensity of also available method of interpolation.Utilize formula to calculate and the corresponding different template scanning position of different wave length with the different wave length on the above-mentioned filter transmission spectrogram and other condition that the user provides again.Just can obtain thus as shown in Figure 6 that exposure is strong on the required grating length direction of user distributes and manufacturing conditions, just can produce the required grating of user according to above-mentioned scanning wrting method with the device of Fig. 1 again, its manufacture craft flow process and program flow chart are seen Fig. 2 and Fig. 3.
Details are as follows now to lift an enforcement:
The device of present embodiment preparing grating method as shown in Figure 1.Wherein, light source adopts continuous 244nm frequency multiplication Argon ion laser (production of U.S. coherent company).Scanning reflection mirror is fixed on the ESP6000 scanning mobile platform (production of Newport company), and scanning mobile platform kinematic accuracy is 0.1mm.Catoptron has the function of scanner uni folded light beam, and the ultraviolet light of laser instrument output is reflexed on the phase mask, and this phase mask length is 45mm, and ultraviolet light is radiated at carrying on the standard single-mode fiber of processing through hydrogen under it through phase mask.ESP6000 scanning mobile platform links to each other with the PIO mouth (not shown) of microcomputer.By the drive software that operation on microcomputer designs in advance, change the motion state (movement velocity, run duration, move distance) of mobile platform, it is moved according to a certain characteristics of motion, just can obtain different saturating (instead) and penetrate the fiber grating of spectrum.
In the whole process of making, adopting spectrum width is that the wide range image intensifer spontaneous radiation light source of 100nm, the AQ-6317 spectrometer that precision is 0.01nm carry out the test of grating performance, reflectance spectrum and transmitted spectrum to fiber grating are analyzed, and can obtain the performance parameter of fiber grating.
The manufacturing process brief introduction of present embodiment:
At first hot spot is rested on template center place, i.e. z=0 place is by change residence time t, such as t
1=5 seconds, exposure intensity kafa
1=100; t
2=10 seconds, exposure intensity kafa
2=200; Can obtain the relation of the residence time and exposure intensity kafa.Adopt the mode of database to store this corresponding relation.
The transmission spectrum shape of the arbitrary shape that the user is provided changes into required exposure intensity spectrum shape earlier, then with this spectrum shape segmentation.Wavelength for each section after dividing can be by above-mentioned chirp grating wavelength X and template chirp coefficient cg
1And the relation formula of template scanning position z finds the pairing position of each section on the grating.That is to say that the length direction with preparing grating also is divided into identical hop count, each segment length is dl=grating length/segments.
Because the size of known every section wavelength exposure intensity, thus can obtain by inquiry in the database of having set up at the size of the residence time in every section manufacturing process, kafa=200 for example, residence time need 10 seconds as can be known then expose from database herein; If kafa=150 can't directly inquire the residence time in the database in addition, then can adopt the method for numerical interpolation, by t
1=5 seconds, exposure intensity kafa
1=100; t
2=10 seconds, exposure intensity kafa
2=200; Adopt the required as can be known residence time t=7.5 of linear interpolation second.Under the assurance prerequisite of certain precision, adopt certain interpolation algorithm, can reduce the workload in the database creation process greatly.
The facula position change of scanner control can adopt constant speed to carry out, as v=2.5mm/s; The difference of the residence time is determined by every section different exposure intensity.Press the segmentation of grating length direction, make the fiber grating filter spare that goes down just can obtain the required spectrum of user shape in turn for every section every section.
Fig. 7 is that calculate and the required comparison that obtains ground wave filter spectrogram: a calculates by this design, and b is required obtaining, and error is in ± 0.1dB.
Claims (2)
1, saturating (instead) method for making of penetrating the controlled high-chip fiber grating of shape, it is that a kind of scanning wrting method of the characteristics in conjunction with phase mask method and continuous wave laser light source is that light source is radiated on the phase mask through the mirror reflects on the scanner, catoptron is placed on the scanning translation stage, and optical fiber is close to template.Broad spectrum light source and spectral investigator are penetrated spectrum change in order to saturating (instead) of grating in the real-time monitoring manufacturing process, when scanning translation stage drive mirror motion scans, the position of suffered uv-exposure point also changes thereupon and makes optical fiber obtain different exposure intensities at diverse location on the optical fiber, to make various types of fiber gratings.The invention is characterized in that it contains following steps successively:
(1) with the corresponding optical fiber of specific wavelength on the effective length scope in different exposure intensities promptly when light source output power is constant, make continuously by above-mentioned scanning wrting method in the different residence time of catoptron and obtain many gratings;
(2) measure and note the promptly corresponding residence time of above-mentioned various exposure intensity and this effective length interior (instead) thoroughly and penetrate rate one-to-one relationship numerically.This relation all is suitable for for any wavelength in the whole grating bandwidth, sets up database in view of the above;
(3) the filter transmission spectrogram that obtains according to user's needs, the manufacturing conditions that obtains making the required grating of user:
(3.1) at known grating length L, grating periods lambda, template chirp coefficient cg
1With optical fiber effective refractive index n
EffCondition
Down, the filter transmission spectrogram that provides according to the user with following formula calculates the template scanning position z's of wavelength X
Corresponding relation:
λ=2
*n
Eff *(Λ+cg
1Z), wherein-L/2≤z≤L/2;
(3.2) utilize method of interpolation anti-from above-mentioned database according to saturating (instead) rate of penetrating in the given filter transmission spectrogram of user
Check in the relation that reflectivity and coupling coefficient are exposure intensity;
(3.3) obtain along the distribution situation of grating length direction exposure intensity by step (3.1), (3.2), promptly in given exposure
Under the condition of amount, the relation of the residence time on this position of the catoptron on template scanning position z and the scanner;
(4) manufacturing conditions that obtains according to step (3) is produced the fiber grating of required spectrum shape with above-mentioned scanning wrting method.
2, (instead) according to claim 1 penetrates the method for making of composing the controlled high-chip fiber grating of shape, it is characterized in that: described catoptron is done diverse location and is taked the stoppage in transit of walking of the different residence time to move under the control of scanning mobile platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021293074A CN1170176C (en) | 2002-08-30 | 2002-08-30 | Process for preparing high-chip optical fibre raster with controllable transmission (reflection) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021293074A CN1170176C (en) | 2002-08-30 | 2002-08-30 | Process for preparing high-chip optical fibre raster with controllable transmission (reflection) |
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|---|---|
| CN1397813A true CN1397813A (en) | 2003-02-19 |
| CN1170176C CN1170176C (en) | 2004-10-06 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303446C (en) * | 2004-01-09 | 2007-03-07 | 清华大学 | Tunable dispersion compensator designing and making method |
| CN100362338C (en) * | 2005-01-31 | 2008-01-16 | 中国海洋大学 | Method for acquiring optimal variable angle synchronous fluorescent spectrum |
| CN102222282A (en) * | 2011-06-23 | 2011-10-19 | 成都新易盛通信技术有限公司 | Automatic tracing method suitable for optical module production |
| CN102362204A (en) * | 2009-01-21 | 2012-02-22 | 印度信息技术部秘书处 | A process and system for manufacturing stable fiber bragg gratings (FBGS) |
| CN103616742A (en) * | 2013-12-11 | 2014-03-05 | 李智忠 | Method for fabricating chirped fiber grating |
| CN109991699A (en) * | 2017-12-29 | 2019-07-09 | 北京交通大学 | 2 mu m waveband phase shift sampling optical-fiber gratings and manufacturing system and method |
| WO2022165959A1 (en) * | 2021-02-03 | 2022-08-11 | 深圳大学 | Chirped fiber grating, preparation method therefor, and chirped fiber grating filter |
-
2002
- 2002-08-30 CN CNB021293074A patent/CN1170176C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303446C (en) * | 2004-01-09 | 2007-03-07 | 清华大学 | Tunable dispersion compensator designing and making method |
| CN100362338C (en) * | 2005-01-31 | 2008-01-16 | 中国海洋大学 | Method for acquiring optimal variable angle synchronous fluorescent spectrum |
| CN102362204A (en) * | 2009-01-21 | 2012-02-22 | 印度信息技术部秘书处 | A process and system for manufacturing stable fiber bragg gratings (FBGS) |
| CN102362204B (en) * | 2009-01-21 | 2014-01-15 | 印度信息技术部秘书处 | A process and system for manufacturing stable fiber bragg gratings (FBGS) |
| CN102222282A (en) * | 2011-06-23 | 2011-10-19 | 成都新易盛通信技术有限公司 | Automatic tracing method suitable for optical module production |
| 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 |
| CN109991699A (en) * | 2017-12-29 | 2019-07-09 | 北京交通大学 | 2 mu m waveband phase shift sampling optical-fiber gratings and manufacturing system and method |
| CN109991699B (en) * | 2017-12-29 | 2024-04-16 | 北京交通大学 | 2 mu m wave band phase shift sampling optical fiber grating and manufacturing system and method |
| WO2022165959A1 (en) * | 2021-02-03 | 2022-08-11 | 深圳大学 | Chirped fiber grating, preparation method therefor, and chirped fiber grating filter |
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| Publication number | Publication date |
|---|---|
| CN1170176C (en) | 2004-10-06 |
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