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A digital-baseband/SCM-control fiber unk with novel differential integrated optic transmitter and microwave/optical direct detection receiver

Abstract:

Fiber-optic networks offer the potential to support very wideband, flexible communications for future analog and digital applications. Optical subcarrier multiplexing (OSCM) allows parallel data channels to be transmitted on an optical fiber using a single optical source. One application of OSCM is out-of-band signaling in optical fibers where the ita channel is transmitted at baseband and the control channel multilplexed onto an RF subcarrier. The control channel is easily recovered by following photodetection with a microwave bandpass filter. Digital information transmitted on the microwave subcarrier can be used to setup end-to-end connections in a circuit switched network;, handle contention resolution [ 13, and transmit headers in packet-based networks [2, 3,4]. In this paper we present the results of an OSCM digital-basebandSCM-control link that utilizes a novel transmitter architecture [ 51 and a microwave/optical direct detection receiver. The transmitter is based on a differentially driven Mach-Zehnder integrated optic modulator. The modulator is used to optoelectronically combine the baseband and subcarrier signal onto the optical carrier. The receiver is based on a simple pin photodetection followed by a traveling wave amplifier, band pass filter and Schottky biarrier diode for envelope detection.