PD-LD is now offering its next generation of WDM style bi-directional transmitter and receiver modules operating in the 1310 and 1550nm optical windows. These devices are designed to simultaneously transmit and receive over a single optical fiber at frequencies from DC to 1.5 GHz. Dual wavelength bi-directional modules replace the need for a single mode fiber coupled laser diode, a fiber coupled InGaAs PIN photodiode, a discreet fiber optic WDM and a second stage optical isolator. The BiDirectional Modules combine all of these optical functions and relieve the user of having to fusion splice several discreet units together and then squeeze them onto their PCB
These small , compact modules require minimal board real estate and when used in pairs deliver full duplex operation of a single 9/125um optical fiber with crosstalk of <-47dB. The PD-LD product incorporates low threshold current, high differential quantum efficiency MQW(Multiple Quantum Well) FP semiconductor lasers whose typical total opating currents are less than 30mA. The receiver section offers a discreet 75um diameter InGaAs PIN photodiode of planar semiconductor design that has dielectric passivation for very low noise performance. (See the FSAN family of modules for devices using PIN TIA receivers).
PD-LD’s BiDirectional WDM modules are built to meet the demanding requirements for ATM-PON ONU and LTU applications.