CN1151394C - One-step optical fibre mask plate translation method for preparing apodized optical fibre raster - Google Patents
One-step optical fibre mask plate translation method for preparing apodized optical fibre raster Download PDFInfo
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- CN1151394C CN1151394C CNB011027487A CN01102748A CN1151394C CN 1151394 C CN1151394 C CN 1151394C CN B011027487 A CNB011027487 A CN B011027487A CN 01102748 A CN01102748 A CN 01102748A CN 1151394 C CN1151394 C CN 1151394C
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- fiber grating
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Abstract
The present invention discloses a toe-cutting method of a simple and practical optical fiber grating. A photoactive optical fiber is tightly stuck with a mask board; both the photoactive optical fiber and the mask board are arranged on a platform and do not relatively move. The variable quantity of the refractivity of the grating can be great in the middle of the grating and small at both ends of the grating by controlling the movement speed of the platform and controlling the movement speed and the reciprocal of the toe-cutting function value of the optical fiber grating to be in direct proportion under the condition of keeping the laser pulse output frequency and the laser output energy of a laser constant. Consequently, the toe cutting of the optical fiber grating is realized, and the optical fiber grating with high performance is manufactured.
Description
The present invention relates in optical communication field, make the method for cutting the toe fiber grating of one-step optical fibre mask plate translation.
Fiber grating is that the fiber core refractive index is subjected to periodically perturbation and a kind of novel full fiber optic passive device that forms.Because possess high wavelength selectivity, with the fibre system compatibility, insert advantages such as loss is low, simple in structure, volume is little, preparation technology is simple, with low cost, fiber grating has wide application prospect in optical communication system.Have bigger refringence between common fiber grating two ends and its tail optical fiber, refringence causes end face reflection.The existence of end face reflection has a strong impact on the performance of fiber grating, it reduces the side mode suppression ratio of reflection type optical fiber grating such as gratings such as optical fiber Bragg raster, chirped fiber grating, make the dispersion curve of chirped fiber grating have bigger vibration, make transmission-type fiber grating such as long period fiber grating transmission main peak both sides the little transmission peaks of series occur.For improving the fiber grating performance, must cut toe to grating, even the grating index variable quantity is become to the centre greatly by the grating two ends by certain apodizing function gradually along optical grating axial, reducing the refringence between grating end face and its tail optical fiber, thereby reduce the end face reflection of grating.
Optical fiber Bragg raster is cut general employing of toe cut toe phase mask plate, cost an arm and a leg but cut toe phase mask plate; And, there is not the toe mask plate of cutting of such grating to sell for chirped fiber grating, long period fiber grating.Want to produce and cut toe chirped fiber grating, long period fiber grating, or cut the toe optical fiber Bragg raster, must adopt special manufacture craft with low-cost common even phase place mask plate making.
At present the special fiber grating apodization that generally adopts is can relatively move a scan exposure method under the situation of optical fiber and mask plate, makes synoptic diagram such as Fig. 1.
The present invention provides a kind of simple and practical fiber grating apodization, and this method can be produced the high performance toe fiber grating of cutting of realistic application.
For achieving the above object, we adopt producing device as shown in Figure 2.
After light-sensitive optical fibre 4 was close to mask plate 3, the two all placed on the platform 5, does not relatively move.Platform moves forward with certain speed, and the distance that moves by the control platform just can be produced the grating of respective length like this.Near before saturated, refractive index variable quantity and exposure are approximated to linear proportional relation at the grating refractive index variable quantity.Therefore, we are under the situation of frequency that keeps the output of laser instrument laser pulse and laser output constant in energy, rate travel by the control platform, translational speed is directly proportional with the inverse of fiber grating apodizing function value, just can make the grating refractive index variable quantity small in ends greatly together in grating, thereby realize the toe of cutting fiber grating.
Because after optical fiber was close to phase mask plate, optical fiber and mask plate did not relatively move in the manufacturing process, so method for making of the present invention is less demanding to the spatial coherence of ultraviolet laser; Only need mobile transmission platform in manufacturing process, technology difficulty is low, complicacy is little; In addition, optical fiber and mask plate position remain unchanged, so shine interference of light striped on the optical fiber and the angle of optical fiber remains unchanged always.
Below in conjunction with accompanying drawing the present invention is done to describe in detail for example.
The fiber grating that Fig. 1 adopts is at present cut the toe technology
1 is that Ultra-Violet Laser light beam, 2 is that catoptron, 3 is that mask plate, 4 is that light-sensitive optical fibre, 5 is platform
The fiber grating that Fig. 2 the present invention adopts is cut the toe technology
1 for Ultra-Violet Laser light beam, 2 for catoptron, 3 for mask plate, 4 for light-sensitive optical fibre, 5 is
Platform, 6 is the post lens
Fig. 3 makes a kind of apodizing function that adopts in the fiber grating process
Horizontal ordinate is a length, and wherein L is a fiber grating length; Ordinate is the apodizing function value.
Fig. 4 adopt apodizing function that fabrication techniques of the present invention goes out as shown in Figure 3 cut the linear chirped fiber grating of toe reflectance spectrum
Horizontal ordinate is a wavelength, unit: nm; Ordinate is the optical grating reflection rate, unit: dBm.
The apodizing function time lag curve of cutting the linear chirped fiber grating of toe as shown in Figure 3 that Fig. 5 adopts fabrication techniques of the present invention to go out
Horizontal ordinate is a wavelength, unit: nm; Ordinate is a group delay, unit: ps.
The apodizing function vibration of cutting the linear chirped fiber grating of toe time lag curve as shown in Figure 3 that Fig. 6 adopts fabrication techniques of the present invention to go out
Horizontal ordinate is a wavelength, unit: nm; Ordinate is the time delay vibration, unit: ps.
Here we make of one-step optical fibre mask plate translation and cut toe chirped fiber grating, and mask plate 3 is exactly the chirp mask plate that is used for making the chirped fiber grating.Light-sensitive optical fibre 4 is fixed on the platform 5, then the chirp mask plate is placed on the light-sensitive optical fibre, make light-sensitive optical fibre be close to mask plate, the two does not relatively move.The catoptron 2 of one stationkeeping makes its vertical irradiation chirp mask plate with the UV laser beam reflection.The platform translation forward of computerizeing control, the speed that moves it is directly proportional with the inverse of grating apodizing function value, and the frequency of laser energy and laser pulse output is remained unchanged, and just can produce and cut toe chirped fiber grating.We are with as shown in Figure 3 apodizing function, produce 12cm long cut the linear chirped fiber grating of toe, its reflectance spectrum as shown in Figure 4, delay character is as shown in Figure 5.As seen, grating in the 0.3nm bandwidth time lag curve near linear, through measure curve maximum linear irrelevance (time delay vibration) less than ± 20ps as shown in Figure 6.Time lag curve slope (grating dispersion value) is about-1750ps/nm, can compensate the chromatic dispersion of the conventional single-mode fiber of 100km.
The present invention not only is fit to the toe of cutting of chirped fiber grating, and suitable fiber Bragg fiber grating, long period fiber grating cut toe.The toe mode of cutting that all employing said methods carry out all belongs to the protection domain of this patent.
Claims (1)
1, the method for a translation method for preparing apodized optical fibre raster of a kind of optical fiber mask plate, equipment therefor is made of Ultra-Violet Laser light beam (1), catoptron (2), mask plate (3), light-sensitive optical fibre (4), platform (5); To mask plate (3) exposure, it is characterized in that said catoptron (2) stationkeeping is constant with Ultra-Violet Laser light beam (1); After light-sensitive optical fibre (4) was close to mask plate (3), the two all placed on the platform (5), does not relatively move; Under the situation of frequency that keeps laser pulse output and laser output constant in energy, control platform (5) translational speed is directly proportional with the inverse of fiber grating apodizing function value, realizes the toe of cutting to fiber grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011027487A CN1151394C (en) | 2001-01-05 | 2001-01-05 | One-step optical fibre mask plate translation method for preparing apodized optical fibre raster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011027487A CN1151394C (en) | 2001-01-05 | 2001-01-05 | One-step optical fibre mask plate translation method for preparing apodized optical fibre raster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1309306A CN1309306A (en) | 2001-08-22 |
| CN1151394C true CN1151394C (en) | 2004-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011027487A Expired - Fee Related CN1151394C (en) | 2001-01-05 | 2001-01-05 | One-step optical fibre mask plate translation method for preparing apodized optical fibre raster |
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| CN (1) | CN1151394C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109426086A (en) * | 2017-08-25 | 2019-03-05 | 富士迈半导体精密工业（上海）有限公司 | Reflective exposure sources |
| CN111308607A (en) * | 2018-12-12 | 2020-06-19 | 上海科乃特激光科技有限公司 | Fiber grating apodization device and operation method thereof |
| CN116487996A (en) * | 2023-06-19 | 2023-07-25 | 中国科学院长春光学精密机械与物理研究所 | High side mode rejection ratio narrow linewidth external cavity laser and optical equipment |
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2001
- 2001-01-05 CN CNB011027487A patent/CN1151394C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1309306A (en) | 2001-08-22 |
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