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Adjustable optical fibre polarizer and production thereof

A technology for polarizers and manufacturing methods, applied in the field of tunable polarizers and optical fiber tunable polarizers, to achieve the effects of miniaturization of tuning devices, small insertion loss, and large tuning range

Inactive Publication Date: 2003-06-18
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

However, none of the above-mentioned documents involve the fabrication of long-period fiber grating tunable polarizers on polarization-maintaining fibers.

Method used

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  • Adjustable optical fibre polarizer and production thereof
  • Adjustable optical fibre polarizer and production thereof
  • Adjustable optical fibre polarizer and production thereof

Examples

Experimental program
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Embodiment Construction

[0027] specific implementation plan

[0028] We choose a Panda polarization-maintaining fiber as the high birefringence fiber 1, and write a long-period fiber grating 4 with a period of 450 μm and a length of 8 cm on the core 2 by means of ultraviolet irradiation. Then we use the method of ion sputtering to coat Ti, or Pt, or Au and other metals on the outside of the cladding 3 of the fiber grating 4 uniformly as the inner surface layer, and then use the chemical deposition plus electroplating method to coat metal Ni on the inner surface layer. As the outer layer, a metal resistance collar 5 is formed. This not only improves the strength between the optical fiber and the metal layer, but also is very convenient when soldering. The metal resistance film 5 has a thickness of about 2 μm and a resistance of 3Ω. A pair of lead electrodes 6 are welded on both ends of the metal resistance film 5, and they are fixed on an insulating base plate 7 to keep the long-period fiber grating...

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Abstract

The present invention is a tunable polarizer of optic fiber for long periodical optic fiber grating based on metal collar. The long periodical optic fiber is written on the of an optic fiber with high birefringence, and each peak of the resonation corresponding respectively to the fast and low axle using the effect of birefringence of the optic fiber, so that the effect of polarization is achieved at the wavelength of resonation. In addition, In order to improve the practicalness and flexibility of the polarizer, a metal resistant collar is disposed outside the coating of the polarizer and different values of direct current pass through the collar to change the temperature of the grating using the Joule heat produced by the current so as to achieve wavelength electrical tuning of the polarizer. Comparing it with the current conventional polarizer, the inserting loss is smaller, ratio of photo-extinction is higher, back-reflection is smaller and manufacture is easier.

Description

technical field [0001] The invention relates to optical fiber communication, optical fiber sensing and measurement, in particular to an optical fiber tunable polarizer, which is an tunable polarizer based on a metal collar long-period optical fiber grating. Background technique [0002] In optical systems, people often need to use polarizers. It is an artificial optical device whose function is that when unpolarized light or incompletely polarized light is incident on the polarizer, it only allows light in one polarization direction to pass through within a specific wavelength range, thereby forming polarized light. . Common polarizers mainly include crystal polarizers, wire grid polarizers, glass polarizers and film polarizers, etc., and they are generally large in size. With the development of optical fiber technology, people put forward higher requirements for these bulk optical devices in the fields of optical fiber communication and optical fiber sensing and measureme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/34
Inventor 高侃周赢武陈高庭方祖捷
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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