CN101975997A - Fiber bragg grating tuning method and device thereof - Google Patents

Fiber bragg grating tuning method and device thereof Download PDF

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Publication number
CN101975997A
CN101975997A CN 201010298833 CN201010298833A CN101975997A CN 101975997 A CN101975997 A CN 101975997A CN 201010298833 CN201010298833 CN 201010298833 CN 201010298833 A CN201010298833 A CN 201010298833A CN 101975997 A CN101975997 A CN 101975997A
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China
Prior art keywords
organic polymer
fiber grating
tuning
bragg grating
fiber bragg
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Pending
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CN 201010298833
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Chinese (zh)
Inventor
孙军强
吕溪
李�雨
郭凯凯
江士雄
何向阁
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Priority to CN 201010298833 priority Critical patent/CN101975997A/en
Publication of CN101975997A publication Critical patent/CN101975997A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a fiber bragg grating tuning method and a device thereof. A layer of organic polymer is coated on the surface of a fiber bragg grating, the temperature of the organic polymer is adjusted and controlled, and the fiber bragg grating bonded to the organic polymer can generate deformation because the organic polymer expands with heat and contracts with cold so that the center wave length of the fiber bragg grating is changed and the tuning is realized. The organic polymer has higher sensitivity on temperature than that of the fiber bragg grating so that the fiber bragg grating has large change extent of the wave length, high speed and high accuracy through the effect of expansion with heat and contraction with cold of the organic polymer, thus, the high-efficient tuning can be achieved. The invention also discloses a device for implementing the tuning method, and has the advantages of simple structure, high tuning accuracy, good stability and wide application values.

Description

Fiber grating tuning method and device
Technical field
The invention belongs to the fiber grating tuning technical field, particularly a kind of fiber grating tuning method and device.
Background technology
Fiber grating has very important effect in real life, its Application in Optical communication be mainly the compression of dispersion compensation and pulsewidth, on/drop Voice Channel multiplexer and ripple device, Wavelength division multiplexer/demultiplexer; Application in laser instrument is the frequency-selecting effect that utilizes fiber grating, makes resonator cavity can only feed back the light of a certain specific wavelength, output unifrequency light.In addition, fiber grating can also be applied in the Erbium-Doped Fiber Amplifier (EDFA) and use as the flat gain compensating device; In optical fiber sensing system, because parameters such as the reflection wave wavelength of fiber grating and stress, strain, temperature have good linear relationship, therefore corresponding fiber-optic grating sensor fiber grating can be made, aspects such as bridge, tunnel, buildings and aeronautical and space technology can be widely used in.
Appearance along with tunable fiber grating, the application of fiber grating is more extensive, on the one hand can be as sensitive multiple sensors, standby quantity and the specification of light source on the other hand can the minimizing system in optical fiber communication, be easy to form standardized communication system, the operation cost of system and maintenance cost are reduced significantly.If the laser instrument that adopts tunable fiber grating to be made into just no longer needs each wavelength with a laser instrument.
Tunable fiber grating mainly contains two kinds of tuning methods, and the one, keep constant temperature, realize that by mechanical hook-up fiber grating centre wavelength is tuning.This method needs favorable mechanical stability and repeatable.Another kind method is to realize that by changing temperature fiber grating centre wavelength is tuning, because the elasto-optical effect that optical fiber thermal expansion effects, optical fiber thermo-optic effect and inside of optical fibre thermal stress cause all can cause wave length shift, thereby realizes tuning to centre wavelength.Yet this method need be ignored other physical processes that surrounding layer and testee cause owing to thermal effect, and slower to the speed of fiber grating tuning.
Summary of the invention
The object of the present invention is to provide a kind of fiber grating tuning method that is different from prior art, have that tuning range is big, speed is fast, precision is high and the characteristics of good stability.
Another object of the present invention is to provide the device of realizing above-mentioned tuning methods, have simple in structure, tuning range is big, speed is fast, precision is high and the characteristics of good stability.
The fiber grating tuning method, be specially: at fiber grating surface-coated one deck organic polymer, the temperature of regulation and control organic polymer, organic polymer are expanded with heat and contract with cold and are made the fiber grating bonding with it produce deformation, thereby the centre wavelength that changes fiber grating realizes tuning.
Realize the device of above-mentioned tuning methods, the temperature control module that comprises fiber grating, is coated in the organic polymer on fiber grating surface and is used for organic polymer.
Technique effect of the present invention is embodied in: core of the present invention is to make fiber grating produce deformation by organic polymer to the susceptibility of temperature, thereby the centre wavelength that changes fiber grating realizes tuning.The relative fiber grating of organic polymer is strong to the susceptibility of temperature, and therefore the effect of expanding with heat and contract with cold by organic polymer can make the wavelength shift amplitude of fiber grating big, speed is fast, precision is high, thereby realizes high efficiency modulation.
Description of drawings
Fig. 1 is optical fiber grating tuning device embodiment 1 structural representation of the present invention.
Fig. 2 is the experimental result graph of relation of Fiber Bragg Grating FBG central wavelength lambda B of the present invention and the making alive V of tungsten filament institute.
Fig. 3 is optical fiber grating tuning device embodiment 2 structural representations of the present invention.
Fig. 4 is optical fiber grating tuning device embodiment 3 structural representations of the present invention.
Embodiment
Three kinds of optical fiber grating tuning device example structure of the present invention's design are described with reference to the accompanying drawings as follows:
Embodiment 1 as shown in Figure 1, device comprises Fiber Bragg Grating FBG 11, is coated in the organic polymer polyimide 12 on fiber grating surface, tungsten filament 13, variohm 14 and circuit board (not shown).In the present embodiment, tungsten filament and variohm are temperature control module.The length of Fiber Bragg Grating FBG is 20mm, and the fiber grating bragg wavelength is 1550.03nm; The coated length of polyimide is 20mm; The length of tungsten filament is 30mm, and Fiber Bragg Grating FBG and tungsten filament are close together, and the tungsten filament two ends are welded on the circuit board, and is in parallel with variohm.Control the voltage at tungsten filament two ends by changing the variohm resistance, promptly control the tungsten filament surface temperature, thereby the extension degree of control polyimide coating layer makes Fiber Bragg Grating FBG centre wavelength change with the change of temperature.Because tungsten filament has good thermal conductivity, its diameter and fiber grating can be compared, and this makes the easy control of temperature of polyimide coating layer.Regulate variohm, when making the voltage of tungsten filament rise to 3.5 volts, fiber grating reaches warble maximum tuning amount under the prerequisite of nothing, is 0.56nm, satisfies the needs of ROF (radio-over-fiber) technology.Fig. 2 is the fiber grating bragg wavelengths among the embodiment 1 BExperimental result relation curve with the making alive V of tungsten filament institute.Simultaneously, in tuning process, utilize the transmission spectrum of spectrometer observation Fiber Bragg Grating FBG, any fiber grating chirp phenomenon do not occur.
Embodiment 2 as shown in Figure 3, device comprises fiber grating 31, is coated in the organic polymer acrylate 32 on fiber grating surface, tungsten filament 33, variohm 34 and vacuum sleeve 35.In the present embodiment, tungsten filament, variohm and vacuum sleeve are temperature control module.The length of fiber grating is 20mm, and the coated length of organic polymer is 20mm; The length of tungsten filament is 30mm; The length of vacuum sleeve is 20mm, and diameter is 15mm, and tungsten filament is placed on the axis place of vacuum sleeve, and its two ends are inserted also and are welded on the circuit board, and are in parallel with variohm, and fiber grating is parallel near the axis that tungsten filament is placed on vacuum sleeve.Control the voltage at tungsten filament two ends by changing the variohm resistance, promptly control the Temperature Distribution in the vacuum sleeve, thereby the extension degree of control organic polymer coat makes fiber grating centre wavelength change with the change of temperature.
Embodiment 3 as shown in Figure 4, device comprises fiber grating 41, is coated in the organic polymer polyetherimide 42 and the constant temperature oven 43 on fiber grating surface.In the present embodiment, constant temperature oven is a temperature control module.The length of fiber grating is 20mm, and the coated length of organic polymer is 20mm.The fiber grating that is coated with organic polymer places in the constant temperature oven.Control the extension degree of organic polymer coat by the steady temperature value that changes constant temperature oven, the centre wavelength that makes fiber grating changes with the change of temperature.

Claims (7)

1. fiber grating tuning method, be specially: at fiber grating surface-coated one deck organic polymer, the temperature of regulation and control organic polymer, organic polymer are expanded with heat and contract with cold and are made the fiber grating bonding with it produce deformation, thereby the centre wavelength that changes fiber grating realizes tuning.
2. tuning methods according to claim 1 is characterized in that, described organic polymer is polyimide, acrylate and polyetherimide.
3. realize the device of the described tuning methods of claim 1, the temperature control module that comprises fiber grating, is coated in the organic polymer on fiber grating surface and is used for organic polymer.
4. device according to claim 3 is characterized in that, described organic polymer is polyimide, acrylate and polyetherimide.
5. according to claim 3 or 4 described devices, it is characterized in that described temperature control module comprises variohm and tungsten filament in parallel.
6. device according to claim 5 is characterized in that described temperature control module also comprises vacuum sleeve, and variohm and tungsten filament in parallel place vacuum sleeve inside.
7. according to claim 3 or 4 described devices, it is characterized in that described temperature control module comprises constant temperature oven.
CN 201010298833 2010-09-30 2010-09-30 Fiber bragg grating tuning method and device thereof Pending CN101975997A (en)

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Application Number Priority Date Filing Date Title
CN 201010298833 CN101975997A (en) 2010-09-30 2010-09-30 Fiber bragg grating tuning method and device thereof

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345294A2 (en) * 2002-03-15 2003-09-17 Fitel Usa Corporation Tunable multimode pump source for a Raman amplifier
CN1632635A (en) * 2005-01-04 2005-06-29 江月松 Tunable optical filter
CN101303299A (en) * 2008-05-30 2008-11-12 南开大学 Air relative humidity measuring instrument based on inclined optical fiber grating
CN101652941A (en) * 2007-07-27 2010-02-17 化光通信技术有限公司 Tunable laser module based on polymer waveguide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1345294A2 (en) * 2002-03-15 2003-09-17 Fitel Usa Corporation Tunable multimode pump source for a Raman amplifier
CN1632635A (en) * 2005-01-04 2005-06-29 江月松 Tunable optical filter
CN101652941A (en) * 2007-07-27 2010-02-17 化光通信技术有限公司 Tunable laser module based on polymer waveguide
CN101303299A (en) * 2008-05-30 2008-11-12 南开大学 Air relative humidity measuring instrument based on inclined optical fiber grating

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《江汉大学学报(自然科学版)》 20030331 曹辉，孙军强，黄德修，何立善 光子晶体光纤及在光纤光栅中的应用 全文 1-7 第31卷, 第1期 2 *

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Application publication date: 20110216