Large Angle Optical Polarization Rotation System Based on Cascaded Semiconductor Optical Amplifiers

Abstract

The present invention is based on a large-angle light polarization rotation system of cascaded semiconductor optical amplifiers, which is composed of a plurality of cascaded multi-stage semiconductor optical amplifying units arranged in sequence. There are two forms of the system, one is: each level of amplification unit includes a semiconductor optical amplifier, polarization controller, fiber circulator and laser. The second is: each stage of amplifying unit includes a semiconductor optical amplifier, a polarization controller, a fiber coupler and a laser. In the last amplifying unit, the optical filter is directly connected to a polarization controller to realize the light output. The invention realizes the linear superposition of the rotation angles of the polarization states output by the multi-stage semiconductor optical amplifiers, thereby realizing the large-angle rotation of the polarization directions of the signal lights exceeding 90 degrees. On the one hand, the invention reduces the requirement for controlling the light intensity, on the other hand, it accelerates the rotation speed of the polarization state, which is of great significance for the high-speed processing of all-optical signals.

Description

technical field [0001] The invention relates to the field of optical signal processing, in particular to a rotation system of signal light polarization state based on a semiconductor optical amplifier. Background technique [0002] At present, high-speed and large-capacity communication systems have become an inevitable trend, and improving the processing rate of all-optical signals has become a key issue. Semiconductor optical amplifiers have the advantages of strong nonlinear effects, fast response, low insertion loss and easy integration, and are widely used in optical fiber communication systems and optical signal processing technology fields. Based on the nonlinear polarization rotation effect of semiconductor optical amplifiers, various all-optical signal processing components such as high-speed all-optical switches, high-speed all-optical logic, and high-speed all-optical buffers can be made, so improving the nonlinear polarization rotation performance of semiconducto...

AI Technical Summary

Problems solved by technology

The traditional semiconductor optical amplifier polarization rotation system controls the polarization rotation by changing the way the semiconductor optical amplifier injects current (electrical control method). Although a single semiconductor optical amplifier can be used to achieve 90-degree polarization rotation of signal light, it is limited by the drive circuit. Relatively slow polarization rotation

The method of changing the control optical power (optical control mode) to rotate the polarization of the signal light has a much faster response speed. However, at present, the output polarization state of the signal light cannot be changed by changing the control optical power injected into a single semiconductor optical amplifier. Rotate 90 degrees

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