Phase controlled changing double-refraction optical fibre all optical switch

A birefringent optical fiber and all-optical switch technology, applied in the optical field, can solve the problems of poor switch curve shape, insensitive switch, loss of light energy, etc., and achieve the effect of convenient control, sensitive control, and low light power reduction

Inactive Publication Date: 2003-05-21
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Utilize this switch that the optical fiber of fixed birefringence is made can realize the function of ultra-fast all-optical switch, but with regard to switch characteristic, have following deficiency: 1. The switch is insensitive, and the phase difference of two bundles of input light needs to change about The switching phenomenon will only occur around π/2 radians, and the phase change re

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  • Phase controlled changing double-refraction optical fibre all optical switch
  • Phase controlled changing double-refraction optical fibre all optical switch
  • Phase controlled changing double-refraction optical fibre all optical switch

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[0020] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Take the switch constructed by winding the low-birefringence fiber as an example, the whole switch structure is as figure 1 As shown, with the optical axis as the center, the polarizer 1, the quarter-wave plate 2, the half-wave plate 3, the self-focusing projection lens 5 and the optical fiber holder 6 included in the fiber coupling system 4 are arranged in order. Variable birefringence optical fiber 7, optical fiber holder 8, self-focusing lens 9, quarter wave plate 10, and polarization beam splitting prism 11. The variable birefringence optical fiber 7 is obtained by plane winding a low birefringence single-mode optical fiber. The main shafts of the quarter wave plate 2 and the half wave plate 3 can be rotated. The variable birefringence fiber 7 is supported and fixed by the fiber holder 6 and the fiber holder 8 at both ends. The main...

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Abstract

The invention is a phase-control variable double-refraction fiber-optical full-light switch, based on existing working theory of phase-control double-refraction fiber-optical full-light switch and adopting variable double-refraction fiber-optical as the hardcore. The input control part controls polarization state of input light and phase difference of two light beam, which are coupled by lens to enter the fiber-optical and then be resolved into level and dextral part by the output part and the phase difference of two light beams are changed to reach the aim to control the switch. The switch curve approaches ideal rectangle.

Description

Technical field: [0001] The invention relates to a phase-controlled variable birefringence optical fiber all-optical switch. The birefringence of the optical fiber is not fixed, but presents a certain symmetrical distribution with the change of the optical fiber, and the phase of the input light is used for switch control, which belongs to the optical technology. field. Background technique: [0002] Optical fiber communication is attracting more and more attention. With the dramatic increase of communication capacity, it is difficult for electronic devices to adapt to high-speed and large-capacity communication requirements. Only by adopting optical switching technology can this problem be solved. The core of optical switching technology is optical switch technology, especially all-optical switch technology that does not require photoelectric conversion. [0003] The birefringence fiber switch controlled by light intensity is mainly caused by the third-order nonlinear eff...

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Application Information

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IPC IPC(8): G02B6/24G02F1/17H04B10/25
Inventor 刘刚军李劬金国良梁斌明
Owner SHANGHAI JIAO TONG UNIV
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