Design And Implementation Of Wavelength Switching System Based On WSS

In recent years, with the rapid development of optical communication technology, DWDM (Dense Wavelength Division Multiplexing) technology has been widely used. Optical wavelength switching technology has the ability to select the wavelength at optical wavelength multiplexing transmission systems. As an important role of optical communication system, people pay more and more attention to it. WSS (Wavelength Selective Switch) has a different wavelength filtering capabilities, which makes it an important part of building optical wavelength switching systems. Currently, dynamic wavelength switching technology has been the industry’s attention.This paper introduces the important wavelength switching technologies:ROADM, OXC and WSS technology.On the characteristics of the technology comparison and analysis, abandoned the ideas to use ROADM, finally, the paper chooses to use the wavelength selective switch DWP50 as core optical components to build the wavelength switching system. As the core optical devices to build optical wavelength switching system, WSS has the ability to achieve 4x4 road DWDM optical signal switching and wavelength add and drop the road. Composed of CPU and FPGA, circuit is able to dynamically control and configure the real-time monitoring on demand. A high-speed CPU MPC860 is the control center of the optical wavelength switching system. And multi-channel interface is expanded by FPGA XC6SLX25. In order to achieve dynamic optical wavelength switching, add, drop and the optical supervisory ability, DWP50 and OCPM receive control commands and transmit monitoring data.From the above analysis, the control circuit sends instructions to optical devices. The system is able to achieve dynamic wavelength switching and optical signal monitoring. After testing, the insertion loss is about 4.4-5.4dBm, and the wavelength of the center frequency drift is low. The experiments showed that using the wavelength-selective switch DWP50 could achieve wavelength switching capacity of 4x4 way DWDM optical signal. The ability improves efficiency of optical wavelength switching.