System and method for code division multiplexed optical...

Details System and method for code division multiplexed optical... System and method for code division multiplexed optical...

2007-01-23

2007-01-23

Singh, Dalzid (Department: 2613)

Optical communications

Multiplex

Code division multiplexing

C398S074000, C398S152000, C398S184000, C398S205000

Reexamination Certificate

active

09962243

ABSTRACT:
A system for optical communication forms a family of orthogonal optical codes modulated by a data stream. The orthogonal codes are formed by creating a stream of evenly spaced-apart pulses using a pulse spreader circuit and modulating the pulses in amplitude and/or phase to form a family of orthogonal optical code words, each representing a symbol. A spreader calibration circuit is used to ensure accurate timing and modulation. Each code word is further modulated by a predetermined number of data bits. The data modulation scheme splits a code word into H and V components, and further processes the components prior to modulation with data, followed by recombining with a polarization beam combiner. The data-modulated code word is then sent, along with others to receiver. The received signal is detected and demodulated with the help of a symbol synchronization unit which establishes the beginning and end of the code words. A polarization mode distortion compensator at the receiver cooperates with a state of polarization compensator at the transmitter to mitigate polarization distortion in the fiber.

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