Technique for accurate carrier frequency generation in of DM sys

Details Technique for accurate carrier frequency generation in of DM sys Technique for accurate carrier frequency generation in of DM sys

1991-07-10

1993-08-24

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359127, 359133, H04J 1402

Patent

active

052394000

ABSTRACT:
An Optical Frequency Division Multiplexing system achieves close channel spacings and thus high density of communications channels in a particular frequency band by providing a very precise carrier frequency stabilization technique. Each laser-generated local carrier signal is locked to a corresponding reference signal. All of the reference signals are generated by a common tunable laser circuit that produces a sequence of bursts of successively higher frequencies determined by resonant points of a single Fabry-Perot filter. Each transceiver of the Optical Frequency Division Multiplexing system includes a frequency tracking circuit that converts received signals from the optical domain to the electrical domain and utilizes an intermediate frequency filter circuit and a servo control circuit to adjust the tunable laser frequency and lock it to the present reference frequency.

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