Optical transceiver integrated with optical time domain reflectometer monitoring

A method of monitoring an optical transceiver, comprising:

• a) receiving optical signals from an optical network unit (ONU) or an optical line terminal (OLT) in a first band of a wavelength division multiplexor (WDM) in the optical transceiver;
• b) converting said optical signals into electronic signals in a first receiver;
• c) outputting an optical data signal in a second band of said WDM;
• d) transmitting test pulse signals from a pulse driving module of an optical time domain reflectometer (OTDR) data processing module in a third band of said WDM, wherein the OTDR data processing module comprising an acquisition module, said pulse driving module, and a pulse signal generating and processing module, and said pulse driving module interfaces with a bias current between a data signal driver and a laser device that outputs said optical data signal, and said test pulse signals have an amplitude of 5%-10% of a data signal amplitude;
• and
• e) receiving a fiber-reflected test signal from said WDM in said OTDR.