CN201965252U - Polarization device based on chirp long-period fiber grating of photonic crystal fiber - Google Patents
Polarization device based on chirp long-period fiber grating of photonic crystal fiber Download PDFInfo
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- CN201965252U CN201965252U CN2011200212825U CN201120021282U CN201965252U CN 201965252 U CN201965252 U CN 201965252U CN 2011200212825 U CN2011200212825 U CN 2011200212825U CN 201120021282 U CN201120021282 U CN 201120021282U CN 201965252 U CN201965252 U CN 201965252U
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Abstract
The utility model provides a polarization device based on a chirp long-period fiber grating of a photonic crystal fiber. The chirp long-period fiber grating is written on the photonic crystal fiber through a carbon dioxide laser writing system, the grating section length of the chirp long-period fiber grating is 26mm, the number of grating grid periods arranged in monotonic increasing mode is 41, a starting period is 600 micrometers, and the incremental quantity of each grating grid period is 25 micrometers. The carbon dioxide laser writing system comprises a computer, a carbon dioxide laser, an incidence light source, an optical fixture and a spectrum analyzer. The polarization device has the advantages of being easy to produce and being applied to mass production. Simultaneously, the extinction ratio of the polarization device can reach 20 decibels, and working bandwidth is 100nm, so that the polarization device has good temperature stability.
Description
Technical field
The utility model belongs to the optical fiber polarisation technical field, relates to a kind of polarizer based on the photonic crystal fiber chirp long period optic fiber grating.
Background technology
Along with the fast development of optical fiber communication and optical fiber sensing technology, polarization state of light seems important all the more to system and components and parts.Optical fiber polarizer is being brought into play unique effect as an important branch of polarizer.Because the fibre optic polarizer volume is little, in light weight, the insertion loss is low, extinction ratio is high, strong with the compatibility of fibre system, thereby gain great popularity.Fibre optic polarizer is widely used, and uses in a large number in passive devices such as optoisolator, optical circulator, photoswitch and photomodulator; In the optical device test macro, fibre optic polarizer cooperates with other devices can obtain stable test condition flexibly, realizes the multiparameter of device is detected; In fibre system, fibre optic polarizer is the Primary Component that produces linearly polarized light; Be the fibre system of main detected characteristics with polarization or phase place, fibre optic polarizer is important passive device, listens sensor and coherent optical communication system etc. as optical fibre gyro, fibre optic current sensor, optical fiber water.
Traditional optical fiber polarizer mainly comprises clad optical fiber polarizer, toroid winding optical fiber polarizer, micropore optical fiber polarizer.Existing optical fiber polarizer respectively has characteristics on performance and method for making, but all has shortcoming separately.Clad fibre optic polarizer size is little, extinction ratio is high, the insertion loss is low, but the manufacture craft more complicated can't realize producing in enormous quantities.Coil fibre optic polarizer and micropore fibre optic polarizer manufacture craft are simpler, but the entire device size is bigger, has reduced practicality.
Photonic crystal fiber has been widely used in optical fiber communication and sensory field of optic fibre as a kind of novel optical fiber with its good optical characteristics, also is used to make simultaneously all kinds of optical device.Polarizer based on the photonic crystal fiber long period fiber grating is suggested, and can reach the extinction ratio greater than 20dB, and a temperature stability is preferably arranged simultaneously.But the bandwidth of operation of this type of polarizer has only 11nm, can't satisfy needs in the practical application.
Summary of the invention
The purpose of this utility model is exactly the problems such as existing polarizer complex manufacturing technology, size are big, work zone width in order to overcome, and proposes a kind of polarizer based on the photonic crystal fiber chirp long period optic fiber grating.
Technical solution of the present utility model is as follows:
A kind of polarizer based on the photonic crystal fiber chirp long period optic fiber grating, use the carbon dioxide laser writing system on photonic crystal fiber, to write chirp long period optic fiber grating, the grid region length of chirp long period optic fiber grating is 26mm, totally 41 grid cycle, grid cycle presents monotone increasing, be 600 μ m start cycle, and each grid cycle incremental change is 25 μ m.Wherein said carbon dioxide laser writing system comprises computing machine, carbon dioxide laser, incident light source, fiber clamp and spectroanalysis instrument; Computing machine connects carbon dioxide laser, carbon dioxide laser be positioned at photonic crystal fiber vertical directly over, the photonic crystal fiber two ends are fixed by fiber clamp, an end is connected with incident light source, the other end is connected with spectroanalysis instrument.
The advantage that the utility model had is: a kind of polarizer based on the photonic crystal fiber chirp long period optic fiber grating, use the carbon dioxide laser writing system on photonic crystal fiber, to write chirp long period optic fiber grating, so method for making is simple, can be used for producing in enormous quantities.This polarizer can reach the extinction ratio of 20dB simultaneously, and bandwidth of operation is 100nm, can satisfy the application need of optical fiber communication and sensory field of optic fibre.In addition, this polarizer has a temperature stability preferably, can the unsettled application system of satisfied temperature environment.
Description of drawings
Fig. 1 is the utility model structural representation.
Fig. 2 is the structural representation of carbon dioxide laser writing system.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, a kind of polarizer 1 based on the photonic crystal fiber chirp long period optic fiber grating, use the carbon dioxide laser writing system on photonic crystal fiber, to write chirp long period optic fiber grating, the grid region length of chirp long period optic fiber grating is 26mm, totally 41 grid cycle, grid cycle presents monotone increasing, and be 600 μ m start cycle, and each grid cycle incremental change is 25 μ m.
As shown in Figure 2, described carbon dioxide laser writing system comprises computing machine 2, carbon dioxide laser 3, incident light source 4, fiber clamp 5 and spectroanalysis instrument 6; Computing machine 2 connects carbon dioxide lasers 3, carbon dioxide laser 3 be positioned at photonic crystal fiber 1 vertical directly over, photonic crystal fiber 1 two ends are fixing by fiber clamp 5, an end is connected with incident light source 4, the other end is connected with spectroanalysis instrument 6.
The utility model is based on following principle:
Photonic crystal fiber is a kind of novel optical fiber, is made of pure quartz, the periodic arrangement radially of distributing in the covering, along the airport of fiber axis to the wavelength magnitude that stretches.When using the carbon dioxide laser writing system after writing chirp long period optic fiber grating on the photonic crystal fiber, because carbon dioxide laser discharges big energy, melted by heat behind the quartzy absorption heat causes photonic crystal fiber covering airport to subside or deformation.The quartzy refractive index of photonic crystal fiber one side changes, and it is asymmetric to produce the formation structure of subsiding simultaneously.Two polarization modes will be asymmetric because of photon crystal optical fibre refractivity distribution difference and structure, produces different losses when transmission.So chirp long period optic fiber grating can have been realized inclined to one side effect.In the present embodiment, we use the solid light photonic crystal fiber, and core diameter is 12 μ m, and the airport diameter is 3.6 μ m, and the airport spacing is 7.5 μ m.The polarizer extinction ratio of the chirp long period optic fiber grating of made reaches 20dB, and bandwidth of operation reaches 100nm.
Claims (2)
1. polarizer based on the photonic crystal fiber chirp long period optic fiber grating, it is characterized in that, use the carbon dioxide laser writing system on photonic crystal fiber, to write chirp long period optic fiber grating, the grid region length of chirp long period optic fiber grating is 26mm, totally 41 grid cycle, grid cycle presents monotone increasing, and be 600 μ m start cycle, and each grid cycle incremental change is 25 μ m.
2. a kind of polarizer according to claim 1 based on the photonic crystal fiber chirp long period optic fiber grating, it is characterized in that described carbon dioxide laser writing system comprises computing machine, carbon dioxide laser, incident light source, fiber clamp and spectroanalysis instrument; Computing machine connects carbon dioxide laser, carbon dioxide laser be positioned at photonic crystal fiber vertical directly over, the photonic crystal fiber two ends are fixed by fiber clamp, an end is connected with incident light source, the other end is connected with spectroanalysis instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200212825U CN201965252U (en) | 2011-01-21 | 2011-01-21 | Polarization device based on chirp long-period fiber grating of photonic crystal fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200212825U CN201965252U (en) | 2011-01-21 | 2011-01-21 | Polarization device based on chirp long-period fiber grating of photonic crystal fiber |
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|---|---|
| CN201965252U true CN201965252U (en) | 2011-09-07 |
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| CN2011200212825U Expired - Fee Related CN201965252U (en) | 2011-01-21 | 2011-01-21 | Polarization device based on chirp long-period fiber grating of photonic crystal fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103227A (en) * | 2011-01-21 | 2011-06-22 | 中国计量学院 | Polarization device based on chirp long-period fiber bragg grating of photonic crystal |
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2011
- 2011-01-21 CN CN2011200212825U patent/CN201965252U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103227A (en) * | 2011-01-21 | 2011-06-22 | 中国计量学院 | Polarization device based on chirp long-period fiber bragg grating of photonic crystal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20120121 |