XQ5710 is an extinction ratio tester which is designed independently by OSCOM Technology.It can be categorized into manual measurement and automatic measurement and can also customize single-channel,dual-channel,multi-channel extinction ratio tester and add the function of upper computer according the customers needs.It very suitable for the applications of polarization maintaining alignment such as line polarized light coupling into polarization maintaining fiber,etc.XQ5710 is stable,reliable,easy to use and very suitable for the research and production testing of polarization maintaining devices and other applications.