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Broadband Upgrade of a Single-Fiber Fiber-in-the-Loop System using Three-Levels of Multiplexing

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Abstract

Fiber-in-the-loop(FITL) is currently being deployed to deliver narrowband services such as voice-only telephony.[1] [2] It is essential to demonstrate that this fiber network, which will become the embedded base of the future, can be upgraded to support broadband services. Since these systems often provide bidirectional narrowband service for many users over a single fiber to reduce the cost/user, it may be difficult to provide this broadband upgrade without introducing large system impairments. Here, we demonstrate the upgrade of a fiber used in a current, low-speed FITL system[1] to provide broadband-ISDN service(622 Mb/s outbound and 155.5 Mb/s return) to each of four subscribers. Our system uses a Passive Optical Network(PON),[3] [4] and, because it simultaneously utilizes wavelength-division multiplexing(WDM), time-division multiplexing(TDM), and subcarrier multiplexing(SCM) on a single fiber, it operates with essentially no interchannel interference. We believe this is the first report of this type of multiplexing. In addition, we observe for the first time penalties associated with coherent interference of separate subcarrier lasers.[5]

© 1992 Optical Society of America

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