ORL-20 series is based on our many years experience in production and testing passive fiber optical communication devices and instrumentation,And learn from the advantages of the instrument in abroad and customer demand in domestic.It is widely used in optical fiber and cable,optical fiber and optical passive devices and communication system's insertion loss and return loss testing.It is a basic and ideal test equipment using in the vast number of manufacturers,research agencies and carriers used in the production of testing,research and development,and construction and maintenance.