CN102636838B - Package method and device for fiber bragg grating with adjustable central wavelength and adjustable temperature coefficient - Google Patents
Package method and device for fiber bragg grating with adjustable central wavelength and adjustable temperature coefficient Download PDFInfo
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Abstract
The invention discloses a package method and device for a fiber bragg grating with adjustable central wavelength and an adjustable temperature coefficient. Two ends of a sleeve pipe (the middle section of which is provided with a cavity) are respectively connected with two adapting rods with a low thermal expansion coefficient and a high thermal expansion coefficient through a thread or a slidingrod structure; each adapting rod partially protrudes into the cavity of the sleeve pipe; two tail fibers of the fiber bragg grating are respectively fixed on the adapting rods at the two ends; the two adapting rods as compensation elements change the positions of two fixed points at the tail of the fiber bragg grating along with the changes of the temperature, and further prestress applied to thefiber bragg grating is changed, and thus the temperature compensation is realized; and through regulating the adapting rods at two sides internally or externally at the same time, the central wavelength of the fiber bragg grating can be regulated, and the temperature coefficient of the fiber bragg grating is regulated through rotating or moving the sleeve pipe to regulate the lengths of the two adapting rods protruding into the cavity in the sleeve pipe.
Description
Technical field
The present invention relates to a kind of fiber grating centre wavelength and temperature coefficient adjustable method for packing and device, belong to optical fiber telecommunications system and technical field of optical fiber sensing.
Background technology
Fiber grating as a kind of full fiber type passive device widespread usage in sensory field of optic fibre and optical fiber telecommunications system.It exposes by optical fiber is placed under the ultraviolet Light Interference Streaks, makes fiber core produce nonvolatil periodic index distribution vertically, thereby forms the reflection-type Passive Optical Components with wavelength selectivity.
In actual application, variation along with ambient temperature, corresponding variation can take place in the effective refractive index of fiber grating and grating cycle, because the centre wavelength of fiber grating is relevant with the grating cycle with its effective refractive index, thereby cause its centre wavelength also corresponding drift can take place, drift value is about 10pm/ ℃.This particularly is unacceptable in dense wavelength division multiplexing system in sensory field of optic fibre and optical communication system, has seriously limited the practical application of fiber grating.Therefore it is very necessary fiber grating being carried out the temperature compensation encapsulation, is very strict to the requirement of the temperature coefficient of fiber grating.
Existing Chinese patent 02278787.9 discloses a kind of fiber grating temperature compensator, and the element that specifically adopts two kinds of thermal expansivity different materials to constitute links together by nested structure, comprises neck bush, lining and external bushing.Neck bush, external bushing is made of the very little material of thermal expansivity, and lining is made of the bigger material of thermal expansivity, and its neck bush is nested in the lining, and lining is in being nested in external bushing.Fiber grating its two ends after applying certain prestress along its axial direction are separately fixed on neck bush and the external bushing, when ambient temperature changes, expansion or the different prestress that cause being applied on the fiber grating of amount of contraction of the lining that constitutes owing to different materials change, thereby compensation is because the variation of the caused fiber grating centre wavelength of temperature variation.This patent provides a kind of simple in structure, compact fiber grating encapsulation scheme, it exists shortcoming to have: after the encapsulation, can't regulate packaging effect, often need repeatedly to repeat to encapsulate the temperature coefficient requirement that just can reach required, fiber grating centre wavelength can't be regulated simultaneously.
Existing Chinese patent 200920319233.2 discloses a kind of fiber grating passive temperature compensation encapsulating structure, it comprises neck bush, external bushing and base, neck bush is nested in the base, and closely contact with external bushing, external bushing is nested between neck bush and the base, leave the gap between external bushing and the base, the two ends of fiber grating are separately fixed at neck bush by epoxy glue and above the base.Bottom or sidepiece at base have threaded hole, and set screw is passed bottom or the sidepiece that threaded hole withstands on external bushing, make its displacement that vertical or side direction take place, thereby realize the adjusting of fiber grating centre wavelength.Its shortcoming has: can't realize encapsulating the adjusting of the temperature coefficient of grating, and when regulating fiber grating centre wavelength, because external bushing is offset, not be in axial direction; Therefore when ambient temperature changes, its expansion or shrinkage component vertically will change, thereby cause the packaging effect of temperature compensation also can change.
Existing Chinese patent 200710178617.2 discloses a kind of fiber grating temperature compensator of wavelength-tunable, comprise temperature compensation mechanism and optical fiber effective length governor motion, its optical fiber effective length governor motion is fixed in temperature compensation mechanism, this governor motion comprises the unsteady regulating block of being located between any fixed connection point and fiber grating, optical fiber is walked around the regulating block contact area that floats and is constituted the tie point that floats, the length that can regulate the optical fiber that comprises fiber grating between the fixed connection point by the position of regulating the regulating block that floats, thus the centre wavelength that realizes fiber grating is regulated.Its shortcoming has: fibre-optical bending is wrapped on the regulating block that floats, and this has limited unsteady regulating block must have bigger bending radius, fractures behind the fibre-optical bending preventing, causes this device size bigger.
Summary of the invention
The objective of the invention is to, provide a kind of fiber grating centre wavelength and temperature coefficient simultaneously adjustable method for packing and device.It can carry out the temperature compensation encapsulation to fiber grating, and can regulate the temperature coefficient of the fiber grating after the encapsulation, and can regulate the centre wavelength of fiber grating within the specific limits, and simultaneously simple in structure, volume is little, and cost is low.
Technical scheme of the present invention: a kind of fiber grating centre wavelength and the adjustable method for packing of temperature coefficient, be characterized in: have the sleeve pipe two ends of cavity to connect the adapting rod of two low thermal coefficient of expansion and high thermal expansion coefficient respectively by helicitic texture in a stage casing, the protruding cavity that advances sleeve pipe of adapting rod part, two tail optical fibers of fiber grating are separately fixed on the adapting rod at two ends, two adapting rods element by way of compensation change the position of two point of fixity of fiber grating afterbody with variation of temperature, and then changed the prestress that is applied on the fiber grating, thereby realization temperature compensation, after encapsulation is finished, can realize adjusting to the temperature coefficient of fiber grating by regulating the protruding length of advancing the inside pipe casing cavity of two adapting rods.
In the method for packing that above-mentioned fiber grating centre wavelength and temperature coefficient are adjustable, the protruding method of advancing the length of inside pipe casing cavity of two adapting rods of described adjusting is, after on the assembling base two adapting rods and sleeve pipe being fixed, unclamp set nut, unclamp fixing sleeve pipe again, rotation or sliding sleeve make sleeve pipe to the left or move on the right side, fix with set nut respectively after having regulated again.
In the method for packing that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, described set nut is arranged on the outside of sleeve part of two adapting rods, under the prerequisite that set nut has locked, continue to tighten or unscrew the fine setting that set nut is realized fiber grating centre wavelength.
In the method for packing that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, the structure that two adapting rods and sleeve pipe are fixed is set on the described assembling base respectively.
In the method for packing that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, described sleeve pipe adopts the material preparation (as the invar material) of low thermal coefficient of expansion and processing and manufacturing easily.
Realize a kind of fiber grating centre wavelength and the adjustable packaging system of temperature coefficient of preceding method, be characterized in: comprise sleeve pipe, the stage casing of sleeve pipe is provided with cavity, two ends are equipped with screw or the through hole that runs through with cavity, be respectively equipped with low high thermal expansion coefficient adapting rod (as aluminum alloy materials) and high low thermal coefficient of expansion adapting rod (as the invar material) in both sides screw or the through hole, all have the through hole that runs through on low thermal coefficient of expansion adapting rod and the high thermal expansion coefficient adapting rod; Fiber grating runs through low thermal coefficient of expansion adapting rod and high thermal expansion coefficient adapting rod by through hole, and gluing fixing by left side glue-applying point and right side glue-applying point.The right side glue-applying point will be on the low thermal coefficient of expansion material like this, because its thermal expansivity is very low, feasible requirement to this gluing precision reduces greatly, improves the fiber grating encapsulation precision.
In the packaging system that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, left side glue-applying point and right side glue-applying point are located at respectively on the side of the interior low thermal coefficient of expansion adapting rod of sleeve pipe cavity and high thermal expansion coefficient adapting rod, and be provided with the groove of being convenient to gluing, gluing adopts 353ND epoxy glue.
In the packaging system that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, be equipped with set nut on the low thermal coefficient of expansion adapting rod outside the described sleeve pipe two ends and the high thermal expansion coefficient adapting rod.
In the packaging system that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, also comprise the assembling base, the assembling base is provided with and is respectively applied to fix the low thermal coefficient of expansion adapting rod at sleeve pipe and two ends thereof and the draw-in groove of high thermal expansion coefficient adapting rod, and draw-in groove is provided with fixed screw.
In the packaging system that aforesaid fiber grating centre wavelength and temperature coefficient are adjustable, described sleeve pipe is provided with the sleeve pipe scale.
Compared with prior art, the present invention can regulate the tc compensation effect of fiber grating of encapsulation, can avoid because the theoretical packaging effect that calculates the temperature compensation that causes to reach required with the error of actual fabrication or manual operation deviation etc., perhaps to have requirement need change the effect temperature compensation etc. of original packaging system former thereby carry out the repeatability encapsulation because of other, save Production Time and cost, can repeatedly regulate encapsulation, reach necessary requirement up to packaged fiber grating temperature coefficient, by regulating, can make the temperature coefficient of packaged fiber grating in 0 degree centigrade to 60 degrees centigrade scope of temperature, be decreased to 0.15pm/ ℃.And can among a small circle, (positive and negative approximately 1nm) regulate the centre wavelength of fiber grating, the while compact conformation, it is little to take up room.
Description of drawings
Figure 1A is screw fiber grating encapsulating structure synoptic diagram of the present invention;
Figure 1B is slide bar type fiber grating encapsulating structure synoptic diagram of the present invention;
Fig. 2 is installed in the synoptic diagram that assembles in the base for encapsulating structure;
Fig. 3 is the sectional view of the optical fiber grating temperature compensation the regulated packaging system before regulating;
Fig. 4 is the sectional view of the optical fiber grating temperature compensation the regulated packaging system after regulating;
Fig. 5 is the structural representation of special-purpose assembling base;
The centre wavelength of Fig. 6 fiber grating when not using apparatus of the present invention and method is with the variation of temperature curve map;
Fig. 7 for the centre wavelength of using fiber grating after apparatus of the present invention and the method with the variation of temperature curve map.
Being labeled as in the accompanying drawing: 1-set nut; The 2-sleeve pipe; 3-left side glue-applying point; 4-right side glue-applying point; The 5-fixed screw; The 6-fiber grating; 7-low thermal coefficient of expansion adapting rod; 8-assembles base; 9-high thermal expansion coefficient adapting rod; 10-sleeve pipe scale.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples, but not as the foundation to the present invention's restriction.
Embodiment.A kind of fiber grating centre wavelength and the adjustable method for packing of temperature coefficient, there are the sleeve pipe two ends of cavity to connect the adapting rod of two low thermal coefficient of expansion and high thermal expansion coefficient respectively by helicitic texture in a stage casing, the protruding cavity that advances sleeve pipe of adapting rod part, two tail optical fibers of fiber grating are separately fixed on the adapting rod at two ends, two adapting rods element by way of compensation change the position of two point of fixity of fiber grating afterbody with variation of temperature, and then changed the prestress that is applied on the fiber grating, thereby the realization temperature compensation, and can regulate the temperature coefficient of fiber grating by regulating the protruding length of advancing the inside pipe casing cavity of two adapting rods.The protruding method of advancing the length of inside pipe casing cavity of two adapting rods of described adjusting is, after on the assembling base two adapting rods and sleeve pipe being fixed, unclamp set nut, unclamp fixing sleeve pipe again, revoling tube, make sleeve pipe to the left or the right side move, fix with set nut respectively again after having regulated.Described set nut is arranged on the outside of sleeve part of two adapting rods, under the prerequisite that set nut has locked, continues to tighten or unscrew the fine setting that set nut is realized fiber grating centre wavelength.Described sleeve pipe adopts the preparation of low thermal coefficient of expansion material.
Realize a kind of fiber grating centre wavelength and the adjustable packaging system of temperature coefficient of said method, as Figure 1A and shown in Figure 2, comprise sleeve pipe 2, the stage casing of sleeve pipe 2 is provided with cavity, two ends are equipped with the screw that runs through with cavity, be respectively equipped with low thermal coefficient of expansion adapting rod 7 and high thermal expansion coefficient adapting rod 9 in the screw of both sides, low thermal coefficient of expansion adapting rod 7 and high thermal expansion coefficient adapting rod 9 are a part outside sleeve pipe 2, and a part is in the cavity of sleeve pipe 2; Fiber grating 6 runs through low thermal coefficient of expansion adapting rod 7 and high thermal expansion coefficient adapting rod 9, and gluing fixing by left side glue-applying point 3 and right side glue-applying point 4.Left side glue-applying point 3 and right side glue-applying point 4 are located at respectively on the side of the interior low thermal coefficient of expansion adapting rod 7 of sleeve pipe 2 cavitys and high thermal expansion coefficient adapting rod 9, and are provided with the groove of being convenient to gluing.Be equipped with set nut 1 on low thermal coefficient of expansion adapting rod 7 outside described sleeve pipe 2 two ends and the high thermal expansion coefficient adapting rod 9.Also comprise assembling base 8, as shown in Figure 5, assembling base 8 is provided with and is respectively applied to fix the low thermal coefficient of expansion adapting rod 7 at sleeve pipe 2 and two ends thereof and the draw-in groove of high thermal expansion coefficient adapting rod 9, and draw-in groove is provided with fixed screw 5.Described sleeve pipe 2 is provided with sleeve pipe scale 10.Wherein the screw that runs through with cavity also can be set to through hole, and low thermal coefficient of expansion adapting rod 7 is connected with sleeve pipe 2 in the slide bar mode with high thermal expansion coefficient adapting rod 9, as shown in Figure 1B.
Aforesaid a kind of fiber grating centre wavelength and the adjustable packaging system of temperature coefficient, can accurately control the length of high thermal expansion coefficient adapting rod 9 in sleeve pipe 2 by the scale on the sleeve pipe 2, when regulating the temperature coefficient of packaged fiber grating, can accurately read the regulating and controlling amount by sleeve pipe 2 high scales simultaneously.
Principle of work: centre wavelength is an important parameter of fiber grating, and its effective refractive index with fiber grating is relevant with the grating cycle, and its physical relationship formula is as follows:
In the formula
Be the centre wavelength of fiber grating,
Be the effective refractive index of fiber grating,
Be the fiber grating cycle.
When ambient temperature changed, because the thermo-optic effect of optical fiber and effective refractive index and the grating cycle of thermal expansion effects fiber grating all corresponding variation can take place, its physical relationship formula was as follows:
In the formula
Be the variation of the fiber grating centre wavelength that caused by temperature variation,
Be the thermo-optical coeffecient of optical fiber,
Be the thermal expansivity of optical fiber,
Be the ambient temperature changing value.
The external world apply prestress on fiber grating after, when this prestressed size changed, because the elasto-optical effect of optical fiber, corresponding variation also can take place in the centre wavelength of fiber grating, its physical relationship formula is as follows:
In the formula
Be the variation of the fiber grating centre wavelength that caused by STRESS VARIATION,
Be the elasto-optical coefficient of optical fiber,
The strain that causes for the external world.
By as can be seen above-mentioned, the variation of the centre wavelength of fiber grating and ambient temperature and stress is all linear, so make the center wavelength variation that fiber grating is total when the extraneous stress that be applied on the fiber grating
Satisfy following relational expression, just can realize the temperature compensation of fiber grating:
Shown in Figure 1A, the invention provides a kind of optical fiber grating temperature compensation packaging system of regulating, comprise specialized barrel 2, high thermal expansion coefficient adapting rod 9, low thermal coefficient of expansion adapting rod 7 etc.
Described high thermal expansion coefficient adapting rod 9, low thermal coefficient of expansion adapting rod 7 is coupled by helicitic texture from the two ends of sleeve pipe 2 respectively, and be locked respectively by 2 set nuts 1, when regulating then, said structure is fixed on the assembling base 8 by fixed screw 5 regulates again.Described fiber grating 6 is after applying certain prestress, and the tail optical fiber by its two ends adopts 353ND epoxy glue water to be adhesively fixed on high thermal expansion coefficient adapting rod 9 respectively, in the groove on the low thermal coefficient of expansion adapting rod 7.Groove on two adapting rods and the sleeve pipe 2 all carries out gluing downwards for convenience directly over device.
Described adapting rod 9 adopts different materials to constitute with adapting rod 7, and when regulating the optical fiber grating temperature compensation effect, the adjusting of effect temperature compensation is carried out in the displacement that utilizes two kinds of material coefficient of thermal expansion coefficient difference and sleeve pipe to produce when mobile.
Described adapting rod 7 adopts the low thermal coefficient of expansion material to constitute, and the glue-applying point of such end will be on the low thermal coefficient of expansion material, because its thermal expansivity is very low, feasible requirement to this gluing precision reduces greatly, improves the precision of fiber grating encapsulation.
Described sleeve pipe 2 can adopt the very little invar material of thermal expansivity to make.
High thermal expansion coefficient adapting rod 9 all links to each other with sleeve pipe 2 by helicitic texture with low thermal coefficient of expansion adapting rod 7, and the protruding inside of advancing sleeve pipe 2 of some length respectively, and as shown in Figure 3, the starting point of this part is to the distance of glue-applying point
With
Be respectively effective compensating length of high thermal expansion coefficient adapting rod 9 and low thermal coefficient of expansion adapting rod 7.Distance between two glue-applying points is
, the length of rectangular recess is on the sleeve pipe 2
In the formula
Be the thermal expansivity of high thermal expansion coefficient adapting rod,
Be the thermal expansivity of low thermal coefficient of expansion adapting rod,
Be the thermal expansivity of sleeve pipe,
Changing value for ambient temperature.
Because
The variation of length, thus the prestress that causes being applied on the fiber grating changes; Because fiber grating itself is also elongated because of the meeting expanded by heating, finally cause taking place on the fiber grating strain simultaneously
Drawn by following formula:
In the formula
Thermal expansivity for fiber grating.
The above-mentioned formula of simultaneous (4) and formula (6) can get:
Therefore after selecting suitable material, when the design length size
,
,
With
Satisfy the temperature compensation encapsulation that fiber grating just can be realized in formula (7) back.
Calculate and after encapsulation finishes in above-mentioned theory; usually can calculate the packaging effect that causes to reach temperature compensation with the error of actual fabrication or manual operation deviation etc. because of theory; perhaps there is requirement need change the effect temperature compensation of original packaging system in addition; the prior art scheme expends Production Time and cost occurring having only selection to encapsulate again under the above-mentioned situation.The packaging system that fiber grating centre wavelength provided by the present invention and temperature coefficient are adjustable can be regulated the temperature coefficient of the fiber grating after the encapsulation.
When the temperature coefficient of fiber grating is regulated, on assembling base 8, two adapting rods and sleeve pipe 2 are fixed, unclamp after the set nut 1, unclamp fixing to sleeve pipe 2 again, revoling tube 2 makes sleeve pipe 2 to the left or move on the right side, fix with set nut 1 respectively again after having regulated, and leave the interval of any between set nut 1 and the sleeve pipe 2 to make things convenient for sleeve pipe 2 rotations mobile, again according to required adjusting requirement, come revoling tube 2 to move; When needs increased the effect temperature compensation of fiber grating, then revoling tube 2 moved to low-expansion coefficient adapting rod 7 directions; Otherwise then reverse rotation sleeve pipe 2 moves to high expansion coefficient adapting rod 9 directions.Accurately control the amount of movement of sleeve pipe 2 according to the size of required regulated quantity by the scale on the contrast sleeve pipe, again the set nut at two ends is locked after having regulated, just can realize the adjusting of the temperature compensation packaging effect of fiber grating.When needs are regulated again, repeat above step and get final product.
The principle that the packaging effect of fiber grating temperature compensator of the present invention is regulated is as follows: moving to high thermal expansion coefficient adapting rod 9 directions with revoling tube 2 is example: the set nut 1 that unscrews both sides, revoling tube 2 moves to high thermal expansion coefficient adapting rod 9 directions, and is again that the set nut 1 at two ends is locked.As shown in Figure 4, in the process of regulating
With
Length constant,
Length increase to
,
Contraction in length be
, by easily seeing among the figure
,
,
,
Axial internal clearance with sleeve pipe 2
Satisfy following relational expression:
Simultaneous formula (6), (8), (9) can get:
In the formula
Preceding along with ambient temperature changes for regulating
The dependent variable of fiber grating,
For regulating the back along with ambient temperature changes
The dependent variable of fiber grating.
Because the thermal expansivity of two adapting rods is different,
Less than
So following formula (10) is a negative value, carry it into formula (6) as can be known,
Value can diminish; So temperature variant regulated quantity of fiber grating centre wavelength
And displacement
Relational expression:
Therefore control according to the temperature variant variable quantity of fiber grating centre wavelength of required adjusting
Stool and urine can realize the adjusting of optical fiber grating temperature compensation effect.Otherwise, when revoling tube 2 moves to low-expansion coefficient adapting rod 7 directions,
Value can become greatly same control
Stool and urine can realize that the effect temperature compensation of fiber grating regulates round about.
When regulating the temperature coefficient of packaged fiber grating, before unscrewing set nut, described sleeve pipe 2, high thermal expansion coefficient adapting rod 9 and low thermal coefficient of expansion adapting rod 7 are fixed in the groove of assembling on the base by fixed screw respectively, rotate or are offset and cause fiber grating to twist off or optical fiber grating temperature packaging effect variation to prevent in the process of regulating two adapting rods.After unscrewing set nut, unclamp the screw of fixed sleeving 2 again, rotate the adjusting that mobile sleeve pipe is realized packaged fiber grating temperature coefficient.
The described optical fiber grating temperature compensation packaging system of regulating continues to tighten or unscrew the fine setting that set nut can be realized fiber grating centre wavelength under the prerequisite that the set nut at two ends has been locked.We once realize the range of adjustment of ± 1 nanometer in experimentation.
The centre wavelength of the centre wavelength that Fig. 6 and Fig. 7 are respectively fiber grating when not using apparatus of the present invention and method fiber grating with the variation of temperature curve map with after using apparatus of the present invention and method is with the variation of temperature curve map.The centre wavelength of fiber grating is 0 degree centigrade to 60 degrees centigrade temperature range after using contrive equipment and method, we have realized that in experiment the centre wavelength drift value of fiber grating is 0.009nm, its temperature coefficient is down to 0.15pm/ ℃, be about 1/60 of the preceding fiber grating of using compensation, the effect temperature compensation of fiber grating is remarkable.
Accompanying drawing is mainly used in principle of work signal, rather than is used to specify form and the details of structure, can also can Outer cylindrical for the polygon in the diagram as adapting rod two ends and sleeve pipe profile.
The above is the specific embodiment of the present invention, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily and replacement all should be encompassed within protection scope of the present invention.
Claims (8)
1. a fiber grating centre wavelength and the adjustable method for packing of temperature coefficient, it is characterized in that: have the sleeve pipe two ends of cavity to connect the adapting rod of two low thermal coefficient of expansion and high thermal expansion coefficient respectively by screw thread or Slide bar structure in a stage casing, the protruding cavity that advances sleeve pipe of part adapting rod, fiber grating two optical fiber are separately fixed on the adapting rod at two ends, two adapting rods element by way of compensation change the relative position of fiber grating both sides point of fixity with variation of temperature, and then changed the prestress that is applied on the fiber grating, thereby realize temperature compensation; By adapting rod outside or inside adjusting simultaneously in both sides can be realized the centre wavelength of fiber grating is regulated, and can regulate the protruding relative length that advances the inside pipe casing cavity of two adapting rods by the relative position of rotation or sliding sleeve and adapting rod and realize adjusting to the temperature coefficient of fiber grating; The protruding method of advancing the length of inside pipe casing cavity of two adapting rods of described adjusting is, after on the assembling base two adapting rods fix, rotates or sliding sleeve, makes sleeve pipe to the left or the right side is moved, and fixes with set nut respectively after having regulated.
2. fiber grating centre wavelength according to claim 1 and the adjustable method for packing of temperature coefficient, it is characterized in that: described set nut is arranged on the outside of sleeve part of two adapting rods, under the incomplete locking state of set nut, the both sides adapting rod outwards or inwardly can be regulated simultaneously, be realized the fine setting of fiber grating centre wavelength.
3. fiber grating centre wavelength according to claim 1 and the adjustable method for packing of temperature coefficient is characterized in that: the structure that two adapting rods and sleeve pipe are fixed is set on the described assembling base respectively.
4. fiber grating centre wavelength according to claim 1 and the adjustable method for packing of temperature coefficient is characterized in that: the preparation of described sleeve pipe employing low thermal coefficient of expansion material.
5. realize a kind of fiber grating centre wavelength and the adjustable packaging system of temperature coefficient of the described method of the arbitrary claim of claim 1 to 4, it is characterized in that: comprise sleeve pipe (2), the stage casing of sleeve pipe (2) is provided with cavity, two ends are equipped with screw or the through hole that runs through with cavity, and low thermal coefficient of expansion adapting rod (7) and high thermal expansion coefficient adapting rod (9) are threaded with sleeve pipe (2) from both sides by screw or through hole respectively; On low thermal coefficient of expansion adapting rod (7) and the high thermal expansion coefficient adapting rod (9) through hole that runs through is arranged all, fiber grating (6) runs through low thermal coefficient of expansion adapting rod (7) and high thermal expansion coefficient adapting rod (9) by through hole, and gluing fixing by left side glue-applying point (3) and right side glue-applying point (4); Also comprise assembling base (8), assembling base (8) is provided with and is respectively applied to fix the low thermal coefficient of expansion adapting rod (7) at sleeve pipe (2) and two ends thereof and the draw-in groove of high thermal expansion coefficient adapting rod (9), and draw-in groove is provided with fixed screw (5).
6. fiber grating centre wavelength according to claim 5 and the adjustable packaging system of temperature coefficient, it is characterized in that: left side glue-applying point (3) and right side glue-applying point (4) are located at respectively on the side of the interior low thermal coefficient of expansion adapting rod (7) of sleeve pipe (2) cavity and high thermal expansion coefficient adapting rod (9), and are provided with the groove of being convenient to gluing.
7. fiber grating centre wavelength according to claim 5 and the adjustable packaging system of temperature coefficient is characterized in that: be equipped with set nut (1) on the low thermal coefficient of expansion adapting rod (7) outside described sleeve pipe (2) two ends and the high thermal expansion coefficient adapting rod (9).
8. fiber grating centre wavelength according to claim 5 and the adjustable packaging system of temperature coefficient, it is characterized in that: described sleeve pipe (2) is provided with sleeve pipe scale (10).
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| TW451092B (en) * | 2000-04-08 | 2001-08-21 | Conn Technology Inc U | Fine-tuning mechanism of fiber grating |
| CN1212528C (en) * | 2002-12-23 | 2005-07-27 | 浙江大学 | Optic fibre grating packing device |
| CN1295531C (en) * | 2004-12-21 | 2007-01-17 | 中国科学院上海光学精密机械研究所 | Soft package fiber grating sensor with fine-adjustable wavelength |
| CN202533602U (en) * | 2012-05-16 | 2012-11-14 | 杭州联光电子有限公司 | Adjustable optical fiber grating temperature compensation device |
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| CN102636838A (en) | 2012-08-15 |
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