CN1405587A - Double refraction optical-fiber grating - Google Patents
Double refraction optical-fiber grating Download PDFInfo
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- CN1405587A CN1405587A CN02148911A CN02148911A CN1405587A CN 1405587 A CN1405587 A CN 1405587A CN 02148911 A CN02148911 A CN 02148911A CN 02148911 A CN02148911 A CN 02148911A CN 1405587 A CN1405587 A CN 1405587A
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Abstract
This invention applies setting optical fiber grating connected with optical fiber communication circuit via a light circulator. The said optical fiber grating is connected into the traditional optical fiber communication circuit via light circulator having an interface connected with the optical fiber grating and the other to the fiber communication circuit. A photosensitive polarization maintaining optical fiber, the raw material of the said opticalf iber grating, low-100cm long is irradiated by 200-300cm laser via phase mask for 10-20 minutes to form an optical fiber grating with refraction rate in periodic change in the fiber, compensating effectively the delay inequality generated from polarized mode dispersion greatly reducing BER of digital communication.
Description
Technical field
The invention belongs to a kind of Communication ray electron device.
Background technology
Communication optical fiber with the quartz glass manufacturing, because a variety of causes causes the ellipse garden of the destructurized one-tenth of garden symmetry core diameter in the optical fiber, produce non-garden stress symmetric, the group velocity that the result makes two orthogonal polarizations touch is inconsistent, and this phenomenon is called polarization mode dispersion.Because polarization mode dispersion forms the fast axle 2 and the slow axis 1 (as shown in Figure 1) that transmit signal in every optical fiber, make two orthogonal polarization state signals arrive the asynchronism(-nization) of receiving end, promptly produces delay inequality.In the high speed fibre transmission system greater than 10Gb/s, the previous optical fiber of laying is because polarization mode dispersion is bigger, thereby therefore the bit error rate of increase data transmission must compensate this.The existing technology that is used for polarized mode dispersion compensation has electronic compensating, and the light compensation is arranged.But these technology can't be accomplished online compensation, promptly can not be installed to carry out the real-Time Compensation usefulness that can only experimentize in the optical fiber telecommunications line in the laboratory.Therefore must carry out compensation easily and effectively to this.
Summary of the invention
The purpose of this invention is to provide a kind of birefringence fiber grating, as the device of polarization mode dispersion (PMD) compensation in optical fiber telecommunications system, the delay inequality of compensating polarization mode dispersion generation easily and effectively, thereby the bit error rate of reduction data transmission.For this reason, the present invention adopts and be provided with the fiber grating that joins by optical circulator and optical fiber telecommunications line on optical fiber telecommunications line.The said structure design has realized purpose of the present invention.
Advantage of the present invention is the delay inequality of compensating polarization mode dispersion generation easily and effectively, thereby reduces the bit error rate of data transmission greatly.
Description of drawings
Fig. 1 is the traditional fiber structural representation
Fig. 2 is a collocation structure synoptic diagram of the present invention
Fig. 3 is a user mode structural representation of the present invention
Embodiment
As Fig. 1, Fig. 2 and shown in Figure 3, a kind of birefringence fiber grating, made by polarization maintaining optical fibre, on optical fiber 3 communication lines, be provided with the fiber grating 6 that joins by optical circulator 8 and optical fiber telecommunications line.Described fiber grating inserts in traditional optical fiber telecommunications line by optical circulator, and optical circulator has an interface and fiber grating to join, in addition on the interface incoming fiber optic communication line.Be on two other interface incoming fiber optic communication line.
Described one section length that has fiber grating is 1 centimetre～100 centimetres, and the best is 10 centimetres.
Described fiber grating is that polarization maintaining optical fibre with a kind of photosensitivity is as starting material, with wavelength is that the laser instrument of 200～300nm (optimal wavelength is 248nm) shines polarization maintaining optical fibre by phase mask plate, and irradiation time is to form refractive index after 10 minutes～20 minutes to become periodically variable fiber grating in optical fiber.The diameter of described polarization maintaining optical fibre is identical with traditional fiber with shape.
During use, the about 10 centimetres of fiber gratings of a segment length are inserted in traditional optical fiber telecommunications line by optical circulator by mode shown in Figure 3.Described optical circulator is purchased product by market, and traditional communication optical fiber with the quartz glass manufacturing, in every optical fiber, form the fast axle 2 and the slow axis 1 (as shown in Figure 1) that transmit signal 4, make two orthogonal polarization state signals arrive the asynchronism(-nization) of receiving end, promptly produce the delay inequality of output signal 5.And fiber grating of the present invention inserts in traditional optical fiber telecommunications line by optical circulator, optical circulator has an interface and fiber grating to join, on two other interface incoming fiber optic communication line, poor by prolonging of two orthogonal polarization state input signals generations, enter by optical circulator and to be about in 10 centimetres of fiber gratings, reflected signal 7 from grating, finish polarized mode dispersion compensation, get back on the optical fiber telecommunications line by optical circulator, be enough to compensate the polarization mode dispersion that existing fiber produces.
The present invention adopts polarization maintaining optical fibre in a kind of photosensitivity as starting material, shines polarization maintaining optical fibre with the laser beam of wavelength 248nm by phase mask plate, and irradiation time can form refractive index after about 10 minutes～20 minutes and be periodic grating in optical fiber.Because the refractive index of two vertical directions differs big (about 10 in this optical fiber
-5), for different polarization states will be in fiber grating the Bragg reflection of diverse location generation grating, thereby can produce the delay inequality of 0-30ps, be enough to compensate the polarization mode dispersion that existing fiber produces, the signal Synchronization that makes the output of fast and slow axis direction, thereby make existing optical fiber telecommunications line can carry out high speed data transfer, and significantly reduce the bit error rate, improve the accuracy rate of data transmission greater than 10G/s..
Claims (4)
1, a kind of birefringence fiber grating is made by polarization maintaining optical fibre, it is characterized in that: be provided with the fiber grating that joins by optical circulator and optical fiber telecommunications line on optical fiber telecommunications line.
2, by the described birefringence fiber grating of claim 1, it is characterized in that: described fiber grating inserts in traditional optical fiber telecommunications line by optical circulator, and optical circulator has an interface and fiber grating to join, in addition on the interface incoming fiber optic communication line.
3, by the described birefringence fiber grating of claim 1, it is characterized in that: the length of described fiber grating is 1 centimetre～100 centimetres.
4, by the described birefringence fiber grating of claim 1, it is characterized in that: described fiber grating is that polarization maintaining optical fibre with a kind of photosensitivity is as starting material, laser instrument with 200～300nm shines polarization maintaining optical fibre by phase mask plate, and irradiation time is to form refractive index after 10 minutes～20 minutes to become periodically variable fiber grating in optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02148911A CN1405587A (en) | 2002-11-12 | 2002-11-12 | Double refraction optical-fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02148911A CN1405587A (en) | 2002-11-12 | 2002-11-12 | Double refraction optical-fiber grating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1405587A true CN1405587A (en) | 2003-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN02148911A Pending CN1405587A (en) | 2002-11-12 | 2002-11-12 | Double refraction optical-fiber grating |
Country Status (1)
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| CN (1) | CN1405587A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100534011C (en) * | 2007-03-20 | 2009-08-26 | 中国科学院西安光学精密机械研究所 | Ultranarrow double-channel filter based on symmetric sampling grating structure |
-
2002
- 2002-11-12 CN CN02148911A patent/CN1405587A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100534011C (en) * | 2007-03-20 | 2009-08-26 | 中国科学院西安光学精密机械研究所 | Ultranarrow double-channel filter based on symmetric sampling grating structure |
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