https://www.optical-sintai.com/products/sfp-bidi-transceiver.html Designed for Ethernet, Fiber Channel, SDH, SONET, or CPRI links over simplex single-mode fiber, the Sintai SFP BiDi optical transceiver use 1310nm, 1490nm, or 1550nm wavelengths and support transmission distance up to 120km and are used in pairs.All Rights Reserved