Abstract
In this paper, we investigate all-optical truly asynchronous detection
without global clocking in an incoherent optical code-division
multiple-access (CDMA) system. The implemented system is designed with an
integrable optical source consisting of an electro-absorption modulator for
pulse carving, compact coders consisting of fiber Bragg grating arrays for
encoding and decoding, and receiver consisting of an all-optical thresholder
for data and clock recovery. We compare three detection schemes: 1)
synchronous detection with data from a photodetector and clock from an
external source; 2) asynchronous detection with data and clock from the
all-optically thresholded signal received by a clock and data recovery (CDR)
unit; and 3) asynchronous detection with data from a photodetector and clock
extracted from the all-optically thresholded signal using CDR. Error-free
transmission is obtained for detection schemes 1) and 3). A combination of
all-optical thresholding and CDR technology is demonstrated in an optical
CDMA system for the first time.
© 2009 IEEE
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