Lucent Technologies Inc.

At&t Bell Laboratories

John H Myers

Carmine James Pagano, Ii

Richard J Ramsay

Lewis F Von Thaer

Phillip A Wissell

A passive fiber optic repeater bypass is provided which brings fault tolerance to repeatered fiber optic transmission systems. A fiber optic bypass provides an alternate signal path around failed repeaters. The bypass optical attenuation is set to ensure the bypass signal is sufficiently small so as not to interfere with the locally regenerated and transmitted signal, but sufficiently large to be received at the next repeater. In the event of a repeater failure, a repeater monitor disables the local laser transmitter allowing the bypass signal to be received at the next repeater.

Passive optical repeater bypass for optical fiber systems

Regeneration of a Manchester coded data stream is improved by a system for distinguishing which data signal transitions are bit center and which are bit end transitions. Using a monostable flip-flop with associated phasing and timing circuits including a feedback circuit from the clock output itself, the edge transitions are masked to allow only the center transitions to be passed and then used to create the timing pulses. A system for avoiding lockup of the apparatus on an erroneous initial pulse is also described.

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Jersey City, NJ, United States of America

John H Myers