FIBER COMMUNICATION SYSTEMS AND METHODS

A downstream transceiver is disclosed for use in an optical communication network. The transceiver has an input portion configured to receive from a remote primary laser source an input laser signal including a coherent tone pair having (i) a first coherent tone containing a downstream modulated signal, and (ii) a second coherent tone containing a downstream unmodulated signal. The transceiver also has a laser injected modulator including a first secondary laser having a resonator frequency locked to a primary frequency of the remote primary laser source. A frequency of the second coherent tone is held constant to a frequency of the first coherent tone. The laser injected modulator is configured to receive the downstream unmodulated signal on the second coherent tone, and output an upstream modulated laser signal. Qc) LU I Ul) Of : 5' CD - - C"'N o -ca ccn CD:a