Abstract

Recent enthusiasm for hybrid fiber/coax (HFC) access systems has been driven by the opportunity for local exchange carriers (LECs) to provide transport of video services, and by the inability of fiber-intensive systems, like passive optical networks (PONs), to deliver broadcast analog (AM-VSB) video signals for low cost. Since high signal fidelity is required, transmission of multiple channels over fiber requires expensive linear lasers. Modern cable operators employ HFC systems and offset costs by sharing each optical receiver with several hundred subscribers. Unfortunately, supporting broadband digital-switched services over HFC is also challenging. The upstream band (5-40 MHz) has limited bandwidth, and is plagued by RF ingress noise. LECs would prefer not to commit to a coax distribution network, but the economics of analog video transmission leaves little choice.

© 1996 Optical Society of America

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