Most commonly,this is used for OTDR testing at 1650 nm.Testing loss on single mode fiber at 1625 nm.This extra wavelength is used to check that the fiber is unstressed, since this wavelength is more sensitive to bending loss.
Image Name Price+
1625nm SM Pigtailed LD 1mW Single Mode Fiber Coupled Laser Diode Module

1625nm SM Pigtailed LD 1mW Single Mode Fiber Coupled Laser Diode Module

1625nm SM Pigtailed LD 1mW Single Mode Fiber Coupled Laser Diode Module 1625nm Pigtailed DFB Laser Diode with SM or PM fiber. 1mW Output...
$560.00