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Published September 2007 | Published
Journal Article Open

Optical-CDMA in InP


This paper describes the InP platforms for photonic integration and the development on these platforms of an optical code division multiple access (O-CDMA) system for local area networks. We demonstrate three building blocks of this system: an optical pulse source, an encoder/decoder pair, and a threshold detector. The optical pulse source consists of an integrated colliding pulse-mode laser with nearly transform-limited 10 Gb/s pulses and optical injection locking to an external clock for synchronization. The encoder/decoder pair is based on arrayed waveguide gratings. Bit-error-rate measurements involving six users at 10 Gb/s showed error-free transmission, while O-CDMA codes were calibrated using frequency resolved optical gating. For threshold detection after the decoder, we compared two Mach--Zehnder interferometer (MZI)-based optical thresholding schemes and present results on a new type of electroabsorber-based MZI.

Additional Information

© 2007 IEEE. Reprinted with permission. Manuscript received December 18, 2006; revised June 15, 2007. [Posted online: 2007-10-15] This work was supported in part by DARPA and SPAWAR under Agreement N66001-01-1 and under Contract HR0011-04-1-0054.

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