Optical implement of optical-fiber network based on polarization and optical activity

This paper goes deeply into the characteristics of polarization and optical activity. Using these phenomena, it presents a new fiber-optic switch. The switch is characteristic in simple structure and polarization-independence. Meanwhile, the output light has no difference in phase and the switch has low optical insertion loss and interchannel crosstalk Moreover, it has fast response speed and can be small in size and so on. Further, the add-drop filter of any wavelength can be realized through the combination of the fiber-optic switch with wavelength division multiplexer and demultiplexer. The paper analyzes the performance of 2 in - 2 out fiber-optic switching network The results show that the insertion loss and the interchannel crosstalk are small.