CN103207465A - Magnetic control tunable filter based on long-period fiber gating - Google Patents
Magnetic control tunable filter based on long-period fiber gating Download PDFInfo
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- CN103207465A CN103207465A CN2012104750559A CN201210475055A CN103207465A CN 103207465 A CN103207465 A CN 103207465A CN 2012104750559 A CN2012104750559 A CN 2012104750559A CN 201210475055 A CN201210475055 A CN 201210475055A CN 103207465 A CN103207465 A CN 103207465A
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Abstract
The invention discloses a magnetic control tunable filter based on long-period fiber gating. A sensing part is the long-period fiber gating manufactured on microstructure fiber, magnetic fluid is filled in air holes in the microstructure fiber, the microstructure fiber is placed in a magnetic field with variable magnetic field strength, wherein the magnetic field is generated by a magnetic field and a tuning device, and two ends of the microstructure fiber are connected with common single mode fiber respectively. Due to the fact that refractive index of the magnetic fluid filled in the air hole of the microstructure fiber is sensitive to the magnetic field, when light passes through the long-period fiber gating, magnetic field strength generated by the magnetic field and the tuning device is adjusted, variation of the magnetic field changes the refractive index of the magnetic fluid to enable effective refractive index of fiber cladding to be changed, resonant wavelength of the long-period fiber gating is changed, therefore the magnetic control tunable filter varying along with an applied magnetic field is obtained, and a tuning range of the magnetic control tunable filter is 1400-1700nm. The magnetic control tunable filter based on the long-period fiber gating is simple to manufacture and low is cost, can be applied in an on-line mode, and can be applied to the optical fiber communication field hopefully.
Description
Technical field
The invention belongs to fiber optic communication field, be specifically related to a kind of magnetic control tunable optic filter based on long period fiber grating.
Background technology
Optical fiber communication is the new communication technology that grows up after the seventies in 20th century, and optical fiber communication is considered to revolutionary progress on the Communication Development history, and at present, Networks of Fiber Communications develops to high-speed, big capacity, intelligent three directions.The development of novel optical device is depended in the development at light networking to a great extent, and wherein, the tunable optic filter that can adapt to its needs becomes a research focus in novel optical device field.
Improve the bandwidth availability ratio of optical-fiber network, dense wave division multipurpose (DWDM) technology has obtained practical application, DWDM makes message capacity improve tens times even hundreds of times, can realize by adjustable light wave-filter in the demultiplexing of wavelength-division multiplex system medium wavelength, the detection of information; Intelligent network is the dynamic assignment network bandwidth flexibly, is the developing goal of modern network technology, and in order to satisfy ASON (Automatically Switched Optical Network) to the requirement of dirigibility and dynamic, tunable techniques becomes the gordian technique of optical device in the ASON (Automatically Switched Optical Network).In addition, the tuned speed of adjustable light wave-filter becomes the important indicator of weighing optical-fiber network dirigibility and dynamic.
Tunable fiber grating filter by electrical heating, has been realized tunable optic filter as a kind of extensive concern that obtained in recent years of tunable optic filter people such as D.M.Costantini plate metal outside common long period fiber grating covering after.The people such as Q.Chen of the state university in Pennsylvania are coated in long period fiber grating covering outside with the polymer nano granules of high electrooptical coefficient, change the refractive index of polymer nano granules by the electrode making alive, thereby realize the tunable filtering of long period fiber grating.In the microstructured optical fibers covering vertically periodic arrangement the airport of wavelength magnitude, nanometer magnetofluid is filled in inside of optical fibre (rather than outside) with the form of liquid, do not change optical fiber structure, the integrated level height, and can onlinely use, thus, the present invention proposes a kind of magnetic control tunable optic filter based on long period fiber grating.
Summary of the invention
Technical matters to be solved by this invention provides a kind of magnetic control tunable optic filter based on long period fiber grating.
Technical solution of the present invention is as follows:
A kind of magnetic control tunable optic filter based on long period fiber grating, this wave filter comprise general single mode fiber, are produced on long period fiber grating, magnetic field generation and tuner, magnetic fluid on the microstructured optical fibers.It is characterized in that: make long period fiber grating at microstructured optical fibers, and perfusion comprises the magnetic fluid of nano magnetic particle in its airport, microstructured optical fibers is placed in the variable magnetic field of magnetic field produces and tuner produces magnetic field intensity, regulates that magnetic field produces and the function of the size realization tunable filtering of the magnetic field intensity that tuner produces.
Advantage of the present invention is: (1) produces by adjusting magnetic field and the size of the magnetic field intensity that tuner produces changes its resonance wavelength, has good tuning performance; (2) long period fiber grating does not have reflected light, can not cause interference to optical communication system.(3) filling of magnetic fluid does not change optical fiber structure, the integrated level height, and can onlinely use.(4) this structure is made easily, and cost is lower.
Description of drawings
Fig. 1 is structural drawing of the present invention
Fig. 2 is the structural representation of perfusion magnetic fluid in the microstructured optical fibers that is manufactured with long period fiber grating among the present invention and the covering airport thereof
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in Figure 1, a kind of magnetic control tunable optic filter based on long period fiber grating comprises general single mode fiber 1, is produced on the long period fiber grating 2 on the microstructured optical fibers, and magnetic field produces and tuner 3, magnetic fluid 4.Get the long microstructured optical fibers of 10cm that is, utilize the little curved method of machinery to make the physics bent forming of optical fiber generating period, thereby making fiber axis make length to the modulation of generating period at microstructured optical fibers by elasto-optical effect is the long period fiber grating of 5cm, in the little airport of microstructured optical fibers covering, utilize the capillarity perfusion to comprise the magnetic fluid of nano magnetic particle then, the length of perfusion depends on the time of perfusion, the length that the present invention pours into microstructured optical fibers is the length 5cm of long period fiber grating, and microstructured optical fibers is placed in the variable magnetic field of magnetic field produces and tuner produces magnetic field intensity, two ends are connected with general single mode fiber respectively with cold connector, and magnetic field produces and the size of the magnetic field intensity that tuner produces changes its resonance wavelength by regulating.
The present invention is based on following principle:
Long period fiber grating mechanism is the coupling between the cladding mode of the basic mode of fiber core forward transmission and transmission in the same way, the basic mode of forward transmission in fibre core, cladding mode coupling in grating region and covering, generally, propagation constant satisfies phase-matching condition in the basic mode at this moment:
λ
LPFG＝(n
core(λ)-n
clad(λ)
m)Λ (1)
In the formula
LPFGBe the basic mode of long period fiber grating and the coupled wavelength of cladding mode, n
Core(λ), n
Clad(λ)
mBe respectively the effective refractive index of basic mode and m rank cladding mode, Λ is the variations in refractive index cycle of long period fiber grating.Luminous energy is coupled to the cladding mode from basic mode, and remaining luminous energy is still transmitted in fibre core, becomes frequency spectrum and selects attenuation device.Owing to pour into the refractive index of magnetic fluid in the microstructured optical fibers airport to residing magnetic-field-sensitive, when light process microstructured optical fibers, the size of the magnetic field intensity that the generation of adjusting magnetic field and tuner produce, the variation in magnetic field has changed the refractive index of magnetic fluid in the optical fiber, the effective refractive index of fibre cladding is changed, change the resonance wavelength of long period fiber grating, thereby obtained the magnetic control tunable optic filter with the externally-applied magnetic field variation.
Gordian technique of the present invention is: long period fiber grating is produced on the microstructured optical fibers with airport structure, and in the airport of microstructured optical fibers, fill the magnetic fluid comprise nano magnetic particle, because the refractive index of magnetic fluid is to residing magnetic-field-sensitive, when light process microstructured optical fibers, the size of the magnetic field intensity that the generation of adjusting magnetic field and tuner produce realizes the function of tunable filtering.
In the present embodiment, the optical fiber that connects usefulness is standard single-mode fiber (YOFC-MKD-101, mode field diameter is 9.9～10.9 μ m@1550nm), and the microstructured optical fibers length of selecting for use is 10cm, and magnetic fluid is water base Fe
3O
4, its density is 1.2g/mL.
Claims (4)
1. the magnetic control tunable optic filter based on long period fiber grating comprises general single mode fiber 1, is produced on the long period fiber grating 2 on the microstructured optical fibers, and magnetic field produces and tuner 3, magnetic fluid 4.It is characterized in that: microstructured optical fibers is placed between two blocks of adjustable electromagnet, and two ends link to each other with general single mode fiber respectively.
2. the magnetic control tunable optic filter based on long period fiber grating according to claim 1 is characterized in that long period fiber grating is fabricated on the microstructured optical fibers with airport structure.
3. the magnetic control tunable optic filter based on long period fiber grating according to claim 1 is characterized in that being filled the magnetic fluid that comprises nano magnetic particle in the airport of microstructured optical fibers.
4. the magnetic control tunable optic filter based on long period fiber grating according to claim 1 is characterized in that long period fiber grating is placed in the variable magnetic field of magnetic field produces and tuner produces magnetic field intensity.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969851A (en) * | 2014-05-06 | 2014-08-06 | 天津理工大学 | Magnetic-control tunable filter based on inclined micro-structure fiber Bragg grating |
| CN110596816A (en) * | 2019-09-07 | 2019-12-20 | 桂林电子科技大学 | Optical fiber filter regulated and controlled by double-period magnetic field |
| CN111025458A (en) * | 2019-12-31 | 2020-04-17 | 桂林电子科技大学 | Novel adjustable fiber grating |
| CN111965754A (en) * | 2020-08-17 | 2020-11-20 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetofluid |
| CN112130249A (en) * | 2020-08-17 | 2020-12-25 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN115185036A (en) * | 2022-07-18 | 2022-10-14 | 江苏师范大学 | Hollow-core fiber grating based on gas paramagnetic effect and implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520555A (en) * | 2009-04-17 | 2009-09-02 | 南开大学 | Functional material filled micro-structure optical fiber based tunable dual-channel grating filter |
| CN102141691A (en) * | 2011-04-25 | 2011-08-03 | 东北大学 | Magnetic control tunable optical fiber comb filter |
| CN102162937A (en) * | 2011-04-08 | 2011-08-24 | 东北大学 | Tunable optical fiber filter based on optical fiber grating loop mirror |
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2012
- 2012-11-16 CN CN2012104750559A patent/CN103207465A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101520555A (en) * | 2009-04-17 | 2009-09-02 | 南开大学 | Functional material filled micro-structure optical fiber based tunable dual-channel grating filter |
| CN102162937A (en) * | 2011-04-08 | 2011-08-24 | 东北大学 | Tunable optical fiber filter based on optical fiber grating loop mirror |
| CN102141691A (en) * | 2011-04-25 | 2011-08-03 | 东北大学 | Magnetic control tunable optical fiber comb filter |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969851A (en) * | 2014-05-06 | 2014-08-06 | 天津理工大学 | Magnetic-control tunable filter based on inclined micro-structure fiber Bragg grating |
| CN110596816A (en) * | 2019-09-07 | 2019-12-20 | 桂林电子科技大学 | Optical fiber filter regulated and controlled by double-period magnetic field |
| CN111025458A (en) * | 2019-12-31 | 2020-04-17 | 桂林电子科技大学 | Novel adjustable fiber grating |
| CN111965754A (en) * | 2020-08-17 | 2020-11-20 | 桂林电子科技大学 | Large-range tunable filter of programmable fiber grating based on magnetofluid |
| CN112130249A (en) * | 2020-08-17 | 2020-12-25 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN112130249B (en) * | 2020-08-17 | 2022-04-19 | 桂林电子科技大学 | Programmable fiber grating based on magnetofluid |
| CN115185036A (en) * | 2022-07-18 | 2022-10-14 | 江苏师范大学 | Hollow-core fiber grating based on gas paramagnetic effect and implementation method |
| CN115185036B (en) * | 2022-07-18 | 2024-03-01 | 江苏师范大学 | Hollow fiber grating based on gas paramagnetic effect and implementation method |
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Application publication date: 20130717 |