CN1128377C - Method and equipment for preparing long-period optical fibre raster - Google Patents
Method and equipment for preparing long-period optical fibre raster Download PDFInfo
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- CN1128377C CN1128377C CN 00132037 CN00132037A CN1128377C CN 1128377 C CN1128377 C CN 1128377C CN 00132037 CN00132037 CN 00132037 CN 00132037 A CN00132037 A CN 00132037A CN 1128377 C CN1128377 C CN 1128377C
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- optical fiber
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Abstract
The present invention a manufacture method for a long period optical fiber grating. The present invention utilizes 1 to 10KHz of pulse of a focusing high frequency CO2 laser to carry out multiple exposure to an optical fiber, wherein the CO2 laser is focused to 50 to 60 mum to increase the luminous energy of unit area, and the pulse width of the CO2 laser is between 10 mus to 20 mus to improve the instant luminous energy. The device is composed of a focusing high frequency CO2 pulse laser, broadband light sources connected with both ends of an optical fiber to be processed, and an optical spectrum analyzer. The principle of the method and the device is essentially different from that of the prior art. The present invention solves the problem that the prior art can not further improve the key index of band rejection ratio. The present invention has high flexibility for processing optical fiber gratings with different parameters.
Description
The present invention relates to a kind of fiber optic passive device, be specifically related to a kind of based on high frequency CO
2Pulsed laser is made the method and apparatus of long period fiber grating, belongs to optical fiber communication and sensory field.
Fibre Optical Communication Technology sharply increases the transmission of Information capacity, the commercialization of the long haul transmission system of present 64 * 10Gbit/s, but still can not satisfy the developing rapidly of demand, particularly the Internet that people increase information explosion formula ground and the broadband demand of bringing.Along with the develop rapidly of high speed optical communication net, new requirement has been proposed also fiber optic passive device.In recent years, cycle tens to (the Long PeriodFiber Grating of the long period fiber grating between the hundreds of micron, abbreviation LPFG) caused the great interest of people, thereby the optical fibre device of this novelty can be coupled to the guided mode energy of core district transmission and cause the loss relevant with wavelength in the cladding mode, it is a kind of extraordinary rejection filter, have be easy to make, added losses are low, retroreflection is little, with advantages such as polarization irrelevant and volume are little.LPFG can be widely used in optical fiber communication and the sensing, suppresses the rejection filter of fiber amplifier spontaneous radiation (ASE) noise, the gain flattener of fiber amplifier as conduct, and mode converter and multiple Fibre Optical Sensor have vast market prospect.What generally adopt at present is to utilize the photosensitivity of optical fiber to add template with ultraviolet light to write LPFG, and famous U.S.'s Bell Laboratory had been invented a kind of continuous CO that uses in nearest 2 years
2Laser instrument carries out spot heating to optical fiber and obtains the manufacture method that refractive index changes by unrelieved stress release (or the optical fiber glass density changes), this method compare with the ultraviolet light wrting method have simpler, cost is low, the available standards single-mode fiber replaces advantages such as light-sensitive optical fibre, but this method is limit by principle, be difficult to improve again the band resistance than this key index, the precise jiggle platform and the laser explosure impulsive synchronization that need clamping optical fiber in addition, so operation is complicated, dirigibility is relatively poor when the fiber grating of processing different parameters.
The objective of the invention is to overcome the deficiency of existing method, provide a kind of based on high frequency CO from principle and device
2Pulse laser is made the method and apparatus of long period fiber grating.
The formation mechanism of long period fiber grating (LPFG): the present invention utilizes the focusing high frequency CO
2Laser pulse (1KHz～10KHz) optical fiber is carried out multiexposure, multiple exposure, because the transient energy in the unit interval is than high nearly thousand times of existing method, therefore the thermal shock effect that is produced just causes that optical fiber glass lattice structure produces defective, and there is the structural rearrangement phenomenon to take place, thereby so just causing that optical fiber glass density that optical fiber is heated a place changes brings corresponding variations in refractive index greatly, and LPFG therefore of the present invention forms mechanism just has different on the principle with method that forefathers utilize low-frequency pulse (a few Hz) to discharge unrelieved stress (or causing the variation of optical fiber glass density).
The device that the present invention adopts is by CO
2Laser instrument, wideband light source and spectroanalysis instrument constitute (see figure 1), CO
2Install the two-dimension optical scanner before the laser instrument additional, its X to pendulum mirror and Y to the pendulum mirror by focus lamp with laser focusing on optical fiber, processed optical fiber places between wideband light source and the spectroanalysis instrument.This CO
2The frequency of laser instrument is 1-10KHz, and this frequency band is the best thermal absorption frequency band of optical fiber quartz glass class material, has therefore increased optical fiber and has absorbed hot efficient, CO in addition
2Laser is focused about 50～60 μ m to increase the luminous energy on the unit area, CO
2Laser pulse width is very narrow, and between 10～20 μ s, luminous energy is just very high moment like this, reaches thousands of watts of per seconds, than high nearly thousand times of existing method.For fully shining fiber core, CO
2Laser facula is with the step-length of the micron cross section of optic fibre (promptly along directions X) of passing by continuously, and this scanning is contained in CO by one
2X in the two-dimensional optical scanner in laser instrument the place ahead partly finishes to the pendulum mirror.For the manufacturing of next cycle, the spacing that the y in the two-dimensional optical scanner sets by computer program to pendulum mirror part moves, and just can finish the processing of predetermined period number so successively and need not transfer table and come the moving fiber (see figure 2).The spectral characteristic of LPFG can be monitored by the real-time measurement system of being made up of wideband light source and spectroanalysis instrument.Because computer-controlled two-dimensional optical scanner can be realized the manufacturing of arbitrary graphic, so dirigibility is very good, can process the LPFG of arbitrary parameter by selecting different pitch and periodicity.
Principle of this manufacturing method and apparatus and existing method and device are essentially different, solved prior art and can not a nearly step improve the difficult problem of band resistance than this key index, make the long period fiber grating purposes more wide, in addition, the device that this method adopted is simpler, so easy to operate, very good for processing without the fiber grating dirigibility of parameter.
The present invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is this long period fiber grating manufacturing installation figure;
Fig. 2 is the schematic diagram of the inventive method production long period fiber grating:
Fig. 3 is the transmitted light spectrogram that utilizes the long period fiber grating that the inventive method and device produce.
Embodiment:
Referring to Fig. 1, this device focuses on high frequency CO by one
2Pulsed laser and wideband light source 4, spectroanalysis instrument 5 are formed, and focus on high frequency CO
2Pulsed laser is by the high frequency CO of a 5KHz
2Pulsed laser 1 and one are loaded on its place ahead and constitute to two-dimensional optical scanner 2, and processed optical fiber 3 is connected between wideband light source 4 and the spectroanalysis instrument 5.Referring to Fig. 2, during processing optical fiber, CO
2Laser is focused about 50 μ m, CO
2Laser pulse width allows CO between 10-20 μ s
2 Laser facula 6 connects optical fiber 3 xsects of passing by with the step-length of a micron, and this scanning is finished to the pendulum mirror by the X of two-dimensional optical scanner, finishes when cross section of optic fibre is processed.The spacing that the Y of two-dimensional optical scanner sets by computer program to the pendulum mirror moves, and moves to the next cycle section, is scanned to the pendulum mirror by X again, processes, and just can finish the processing of predetermined period number so successively.And the spectral characteristic of fiber grating can be monitored by the real-time measurement system of being made up of broad band source and spectroanalysis instrument.7 expressions is variations in refractive index among the figure.
Utilize the present invention to produce the LPFG with leading level in the world, insert loss less than 0.2dB, the band resistance is than up to 25dB, referring to Fig. 3, than the height of U.S. Bell Laboratory report.Centre wavelength and bandwidth can be controlled by adjusting fiber grating pitch and number of cycles respectively in addition.Developed at present and be used to reduce the rejection filter of 1.55 μ m Erbium-Doped Fiber Amplifier (EDFA) spontaneous emission noises (ASE) and be used for the gainequalizer of broadband DWDM with fiber amplifier, owing to be online device, to have a loss low than being used in the similar device that relates to filter plate, cost low two big outstanding advantages, therefore will progressively replace ASE noise-removed filtering device and the gainequalizer that these resolution elements constitute, has very vast market prospect, by 100,000 fiber amplifiers of the annual production in the whole world, each fiber amplifier needs at least one LPFG to estimate, then need 100,000 LPFG devices, if each price is (being about half of present interference filter element device price) about 500 dollars, 5,000 ten thousand dollars the output value then can be arranged, profit can reach 2,000 ten thousand dollars, so LPFG will bring very considerable economic as the requisite online Primary Component of following fiber amplifier.
Claims (3)
1, long period fiber grating manufacture method is characterized in that this method is to utilize to focus on high frequency CO
2Laser pulse 1-10Kz carries out multiexposure, multiple exposure, wherein CO to optical fiber
2Laser is focused about 50-60 μ m to increase unit area luminous energy, CO
2Laser pulse width to improve the moment luminous energy, has following steps between 10-20 μ m:
(1) CO
2Laser facula is with the step-length of the micron cross section of optic fibre of passing by continuously, and this scanning is contained in CO by one
2X in the two-dimensional optical scanner in laser instrument the place ahead finishes to the pendulum mirror;
(2) Y in the two-dimensional optical scanner to the pendulum mirror by the spacing of setting along fiber axis to motion scan, finish the processing of predetermined period number successively.
2, long period fiber grating manufacture method according to claim 1 is characterized in that high-frequency impulse selects about 5KHz CO
2Laser is focused about 50 μ m.
3, utilize claim 1 or 2 described methods to make the device of long period fiber grating, this device is provided with the laser instrument of aiming at processed optical fiber, also be provided with the wideband light source analyser that is connected in processed optical fiber two ends respectively, it is characterized in that described laser instrument is the focusing high frequency CO of 1KHz-10KHz
2Pulsed laser is by a high frequency CO
2Pulsed laser and a two-dimensional optical scanner that is loaded on its place ahead constitute, and two-dimensional optical scanner has X to putting mirror and Y to the pendulum mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00132037 CN1128377C (en) | 2000-11-29 | 2000-11-29 | Method and equipment for preparing long-period optical fibre raster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00132037 CN1128377C (en) | 2000-11-29 | 2000-11-29 | Method and equipment for preparing long-period optical fibre raster |
Publications (2)
| Publication Number | Publication Date |
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| CN1355440A CN1355440A (en) | 2002-06-26 |
| CN1128377C true CN1128377C (en) | 2003-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00132037 Expired - Fee Related CN1128377C (en) | 2000-11-29 | 2000-11-29 | Method and equipment for preparing long-period optical fibre raster |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238000B (en) * | 2014-09-24 | 2017-12-22 | 上海大学 | The method for making conical fiber long-period gratings device and encapsulation |
| CN105842778A (en) * | 2015-01-29 | 2016-08-10 | 纳米及先进材料研发院有限公司 | Long-period grating device and tunable gain flattening filter having same |
| CN107855644A (en) * | 2017-12-07 | 2018-03-30 | 广东正业科技股份有限公司 | A kind of laser processing device and system |
| CN111239890B (en) * | 2020-03-18 | 2024-03-22 | 中国工程物理研究院激光聚变研究中心 | Preparation device and preparation method of micro-nano optical fiber long-period grating |
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| CN1355440A (en) | 2002-06-26 |
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| PB01 | Publication | ||
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| ASS | Succession or assignment of patent right |
Owner name: RAO YUNJIANG Free format text: FORMER OWNER: BAOTONG OPTICAL FIBRE TECHNOLOGY CO LTD, CHONGQING Effective date: 20030410 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20030410 Address after: 400044 School of opto electronic engineering, Chongqing University, Shapingba District, Chongqing Applicant after: Rao Yunjiang Address before: Scarlett dolly Plaza 86 No. 400030 Chongqing Shapingba District, new street 10 floor Applicant before: Baotong Optical Fibre Technology Co Ltd, Chongqing |
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| AR01 | Abandonment of patent right to avoid double patenting |
According to article 9 of the patent law and article 13 of the detailed rules for the implementation of the patent law: 132037.8 of the invention patents in this issue as a notice of authorization, and at the same time corresponding to the 245055 utility model patent to be given up, and in the 19 volume of the 47 issue of the new type of communique on the patent right to abandon the announcement. |
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Granted publication date: 20031119 Termination date: 20101129 |