Triplexer series is 1310/1490/1550nm or customized waves single fiber optical device designed for digital Bi-directional and analog receiver. It is suitable to use in the digital/analog FTTx application. Integrated with two kind of coupler, the first is 1310nm/1490nm splitter and the second is 1490/1550nm filter. The transmitter section incorporates an advanced FP/DFB laser diode can be operated up to 1.25Gb/s, the 1490nm receiver section incorporates an efficient InGaAs/InP PIN photodiode, the 1550nm receiver is a broadcast, low distortion photodiode. The most compacted and cost-effective WDM can be provided in a single fiber. The triplexer can be built for a wide variety of data communicate applications to implement high-speed extends up to 10b/s signal rates, long distance up to 20km. 9/125μm diameter single mode fiber with an optional connector.