All-Optical Asynchronous Detection for a Compact Integrable Incoherent Optical CDMA System

作者：Deng Yanhua^*; Kravtsov Konstantin; Fok Mable P; Prucnal Paul R; Sasaki Kensuke; Gupta Gyaneshwar Chandra; Kobayashi Shuko

来源：Journal of Lightwave Technology, 2009, 27(23): 5370-5375.

DOI：10.1109/JLT.2009.2032302

• All-optical thresholder
• fiber Bragg gratings (FBGs)
• optical code-division multiple-access (CDMA)
• pulse carver

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.

• 出版日期2009-12-1