Fiber optical coupler 1,High return loss 2,Low PDL 3,Low insertion loss Fiber optical couplerType :Single window single mode ... coupling ratioPDLLess than 0.10dBDirectivityLess than 60dBThermal StabilityLess than 0.002 dB per degreeOperating temperature-40degree to +80 degreeStorage temperature-40degree ... -definedPort Configuration1 to 2, 1 to 3, 1 to N, 2 to 2, 2 to 3, 2 to N, User-defined 1 ...