Phase controlled changing double-refraction optical fibre all optical switch

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...

AI Technical Summary

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 requires precise control

2. The switch crosstalk is large, and the switch is not complete

The phase difference of the two input lights changes by about π / 2, and the output changes from 70%-80% of the input light to 5%-10%, which means that with this switch, only 80% of the light can pass through at best, so it will About 20% of light energy is lost

3. The shape of the switching curve is not good

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