CN208334707U - Reflective machinery band-pass filter for long-period fiber gratings - Google Patents
Reflective machinery band-pass filter for long-period fiber gratings Download PDFInfo
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- CN208334707U CN208334707U CN201820954425.XU CN201820954425U CN208334707U CN 208334707 U CN208334707 U CN 208334707U CN 201820954425 U CN201820954425 U CN 201820954425U CN 208334707 U CN208334707 U CN 208334707U
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Abstract
A kind of reflective machinery band-pass filter for long-period fiber gratings, it include core fibre, hollow-core fiber, thermally conductive cylindrical casing, wind line, heating rod and end reflector, it is described to there is core fibre to be placed on the thermally conductive cylindrical casing, the heating rod is placed with inside the thermally conductive cylindrical casing, the winding line has core fibre and the thermally conductive cylindrical casing to be intertwined for described, the hollow-core fiber and described there is core fibre phase welding, the diameter of the hollow-core fiber centre bore and the diameter for having core fibre fibre core are equal, the outer layer diameter of the hollow-core fiber and the outer diameter for having core fibre covering are equal, the end reflector is arranged in the output end endface of hollow-core fiber.The utility model provides a kind of reflective machinery band-pass filter for long-period fiber gratings for having many advantages, such as that tunable resonance wavelength, Mode Coupling intensity controlled, grating are erasable.
Description
Technical field
The utility model relates to sensory field of optic fibre and optic communication passive device field more particularly to machinery long period light
Fine grating (MLPFG) bandpass filter.
Background technique
Grating filter is the optical device for carrying out wavelength selection, required for it can be picked out from numerous wavelength
Wavelength.With the development of optical communication technique, grating filter is as essential pass in wavelength-division multiplex (WDM) fiber optic network
Key device is one of the key network element in wavelength division multiplexed optical network.It is hundreds of for writing out the period on optical fiber for the first time since 1996
Since a micron of LPFG, production is simple due to it by LPFG, be easily attached, insertion loss is low, without retroreflection the advantages that, in light
The communications field plays increasingly important role.In addition, LPFG is (refractive index, temperature, humidity, stress, curved to environmental parameter
Bent, distortion etc.) variation it is very sensitive, therefore, also there is very big competitive advantage in terms of sensing measurement.
Long-period fiber grating acts between the fiber core guided mode of symport and cladding mode, and fiber core guided mode is coupled to by it
The cladding mode of onwards transmission shows transmission-type band-pass filtering property to form the loss peak of resonance wavelength.The filtering of LPFG
Characteristic is determined by manufacturing process such as loss amplitude, resonant wavelength and inhibition bandwidth, and cannot changed.If by LPFG
Passive characteristic be converted to variable or tunable, then just extending their application field, it is equal to be such as applied to adjustable gain
Weighing apparatus, variable attenuator, mode converter and tunable optical fiber laser etc..
In short, current long period optical fiber grating filter there is have a single function, filtering characteristic is unadjustable the disadvantages of.
Summary of the invention
In order to overcome deficiency existing for existing long period optical fiber grating filter filtering characteristic, the utility model provides one kind
Has many advantages, such as the erasable reflective machinery long period optical fiber of tunable resonance wavelength, Mode Coupling intensity controlled, grating
Grating bandpass filter.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of reflective machinery band-pass filter for long-period fiber gratings includes core fibre, hollow-core fiber, thermally conductive circle
Column sleeve pipe, winding line, heating rod and end reflector, it is described to there is core fibre to be placed on the thermally conductive cylindrical casing, it is described to lead
The heating rod is placed with inside hot cylindrical casing, the winding line has core fibre and the thermally conductive cylindrical casing to be wrapped in for described
Together, the hollow-core fiber and it is described have a core fibre phase welding, the diameter of the hollow-core fiber centre bore and described have core fibre
The diameter of fibre core is equal, and the outer layer diameter of the hollow-core fiber and the outer diameter for having core fibre covering are equal, and the end face is anti-
Emitter is arranged in the output end endface of hollow-core fiber.
It is described to have core fibre, including but not limited to single mode optical fiber.
The winding line, the material small using thermal expansion coefficient, elasticity is good are made.Further, the winding line selection
Material includes but is not limited to the materials such as iron or Fypro.
The end reflector is by being made in turn with forming reflecting mirror in hollow-core fiber output end endface plated film
's.Further, the plated film for end reflector is metal film or deielectric-coating.
The heating rod uses Electric heating, by the size of adjusting electric current, increases or reduces the power of heating rod,
And then change the temperature of thermally conductive cylindrical sleeve；Bar material is heated, includes but is not limited only to stainless steel.
The heating rod can change temperature, not due to the thermally conductive cylindrical sleeves and the winding linear thermal expansion degree
Together, so that the winding of the winding line tightens or relaxation, so as to which so that described have core fibre by different pressure, control is fine
Stiffness of coupling between core and covering,
Further, the winding line of different-diameter corresponds to different resonance wavelength.The winding of selection different-diameter can be passed through
Line changes resonance wavelength.
The technical concept of the utility model are as follows: heating rod can make the winding deflation for winding line or pine by changing temperature
It relaxes, so as to which so as to there is core fibre by different pressure, the stiffness of coupling between control fibre core and covering can further pass through
The winding line of different-diameter is selected to change resonance wavelength, pressure size is variable, period adjustable long period optical fiber to be made
Grating, and end reflector is used, to realize reflective bandpass filtering.
The beneficial effects of the utility model are mainly manifested in: 1) there are filtering characteristics for long period optical fiber grating filter at present
The disadvantages of unadjustable, the reflective machinery band-pass filter for long-period fiber gratings of the utility model can realize resonance wavelength and
The adjusting of amplitude losses；2) by making optical fiber be under pressure to Optical Fiber Winding coil, changed by adjusting the temperature of heating rod
The pressure size that darkening fibre is subject to can faster, more easily obtain the better long-period fiber grating of filter effect in this way.
Detailed description of the invention
Fig. 1 is reflective machinery band-pass filter for long-period fiber gratings sectional view, and Fig. 2 is machinery long period optical fiber
The structural schematic diagram of grating.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
Referring to Fig.1, a kind of reflective machinery band-pass filter for long-period fiber gratings, includes core fibre 101, hollow
Optical fiber 102, end reflector 103, winding line 104, thermally conductive cylindrical casing 105 and heating rod 106, have core fibre 101 to be placed on
On thermally conductive cylindrical casing 105, heating rod 106 is placed with inside thermally conductive cylindrical casing 105, winding line 104 there will be core fibre 101 and lead
Hot cylindrical casing 105 is intertwined, and hollow-core fiber 102 and has 101 phase welding of core fibre, in the output end of hollow-core fiber 102
Endface is provided with end reflector 103.
Further, line 104 is wound, is the material that a kind of thermal expansion coefficient is big, elasticity is good.Further, winding line 104 selects
Material includes but is not limited to the materials such as iron or Fypro.
Further, end reflector 103 are by 102 output end endface plated film of hollow-core fiber, to form reflecting surface
Made of and then.
It further, can be metal film or deielectric-coating for the plated film of end reflector 103.
The heating rod 106 uses Electric heating, by adjusting the size of electric current, the power of heating rod is made to increase or subtract
It is small, and then change the temperature of thermally conductive cylindrical sleeve；Bar material is heated, includes but is not limited only to stainless steel.
The heating rod 106 can change temperature, due to the thermally conductive cylindrical sleeves and the winding linear thermal expansion degree
Difference, so that the winding of the winding line tightens or relaxation, so as to so that described have core fibre by different pressure, control
Stiffness of coupling between fibre core and covering,
Further, the winding line of different-diameter corresponds to different resonance wavelength.The winding of selection different-diameter can be passed through
Line 104 changes resonance wavelength.
Referring to Figures 1 and 2, the working process and principle of entire device are as follows: firstly, there is core fibre 101 by winding line
After 104 periodic pressures applied, long-period fiber grating 109 is formed, it will be humorous in wide spectrum or wavelength-division multiplex input light 107
Vibration wave long (shown in Fig. 1 chain lines arrow) is coupled to cladding mode LP from core mode1mIn, resonance wavelengthmMeet phase
With conditionWherein Λ, ncoWithRespectively refer to the effective refractive index and LP of screen periods, fibre core basic mode1m
The effective refractive index of cladding mode.The LP being coupled in covering1mAfter mode reaches 102 output end of hollow-core fiber, by end reflector
103 reflections, are then coupled back into fibre core by fiber grating 109 again during reverse transfer in having 101 covering of core fibre, finally
Input terminal is returned to, so showing bandpass characteristics in resonance wave strong point in reflectance spectrum 108.Do not meet phase-matching condition
Wavelength (in Fig. 1 shown in solid line unidirectional arrow) is resumed in the fibre core relaying for having core fibre 101 and is broadcast, and is reached and is depleted at hollow-core fiber
Fall.
Input can be realized when practical application using optical circulator and reflects the differentiation of signal.
Claims (7)
1. a kind of reflective machinery band-pass filter for long-period fiber gratings, it is characterised in that: include core fibre, hollow light
Fine, thermally conductive cylindrical casing, winding line, heating rod and end reflector, it is described to there is core fibre to be placed on the thermally conductive cylindrical casing
On, the heating rod is placed with inside the thermally conductive cylindrical casing, the winding line has core fibre and the thermally conductive cylinder for described
Casing is intertwined, and the hollow-core fiber and described has core fibre phase welding, the diameter of the hollow-core fiber centre bore and institute
The diameter for stating core fibre fibre core is equal, and the outer layer diameter of the hollow-core fiber and the outer diameter for having core fibre covering are equal,
The end reflector is arranged in the output end endface of hollow-core fiber.
2. a kind of reflective machinery band-pass filter for long-period fiber gratings as described in claim 1, it is characterised in that: institute
Having stated core fibre is single mode optical fiber.
3. a kind of reflective machinery band-pass filter for long-period fiber gratings as claimed in claim 1 or 2, feature exist
In: the winding line is to wind line made of the material small using thermal expansion coefficient, elasticity is good.
4. a kind of reflective machinery band-pass filter for long-period fiber gratings as claimed in claim 1 or 2, feature exist
In: the end reflector is by manufactured and then hollow-core fiber output end endface plated film is to form reflecting mirror.
5. a kind of reflective machinery band-pass filter for long-period fiber gratings as claimed in claim 4, it is characterised in that: use
In end reflector plated film be metal film or deielectric-coating.
6. a kind of reflective machinery band-pass filter for long-period fiber gratings as claimed in claim 1 or 2, feature exist
In: the heating rod uses Electric heating, by adjusting the size of electric current, increases or reduces the power of heating rod, in turn
Change the temperature of thermally conductive cylindrical sleeve.
7. a kind of reflective machinery band-pass filter for long-period fiber gratings as claimed in claim 1 or 2, feature exist
In: the winding line of different-diameter corresponds to different resonance wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820954425.XU CN208334707U (en) | 2018-06-20 | 2018-06-20 | Reflective machinery band-pass filter for long-period fiber gratings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820954425.XU CN208334707U (en) | 2018-06-20 | 2018-06-20 | Reflective machinery band-pass filter for long-period fiber gratings |
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| CN208334707U true CN208334707U (en) | 2019-01-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873177A (en) * | 2018-06-20 | 2018-11-23 | 浙江工业大学 | Reflective machinery band-pass filter for long-period fiber gratings |
| CN111722315A (en) * | 2020-05-27 | 2020-09-29 | 浙江工业大学 | Wire hoop type mechanical long period optical fiber grating |
| CN115857105A (en) * | 2022-11-09 | 2023-03-28 | 重庆大学 | Anti-resonance hollow-core fiber tunable filter based on acousto-optic effect |
-
2018
- 2018-06-20 CN CN201820954425.XU patent/CN208334707U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873177A (en) * | 2018-06-20 | 2018-11-23 | 浙江工业大学 | Reflective machinery band-pass filter for long-period fiber gratings |
| CN108873177B (en) * | 2018-06-20 | 2023-11-28 | 浙江工业大学 | Reflection type mechanical long period fiber grating band-pass filter |
| CN111722315A (en) * | 2020-05-27 | 2020-09-29 | 浙江工业大学 | Wire hoop type mechanical long period optical fiber grating |
| CN115857105A (en) * | 2022-11-09 | 2023-03-28 | 重庆大学 | Anti-resonance hollow-core fiber tunable filter based on acousto-optic effect |
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