Optical access system

Details Optical access system Optical access system

1997-02-03

1999-07-27

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359137, 359139, 359143, 359168, H04J 1402

Patent

active

059300159

ABSTRACT:
An optical access system is disclosed in which subscribers' terminals and optical coupler-splitters of nodes are maintenance-free and required control is effected on the part of the central office alone. At a first position, down-link optical digital signals are generated, which are made "1s" every n bits (n being an integer equal to greater than 2). The optical digital signals, except a train of optical pulses every n bits, are sent as down-link information over a transmission line. At a second position, the optical digital signals, except the optical pulse train, are demodulated from the transmitted down-link optical digital signals, and in an optical gate circuit on which the down-link optical digital signals are incident, up-link optical digital signals based on up-link message data is formed in synchronization with the optical pulses corresponding to every n-th bits and is transmitted to the first position over the transmission line. At the first position, the up-link optical digital signals sent from the second position is received from the transmission line.

REFERENCES:
patent: 4963729 (1990-10-01), Spillman et al.
patent: 5010586 (1991-04-01), Mortimore et al.
patent: 5572612 (1996-11-01), Delavaux et al.
patent: 5608565 (1997-03-01), Suzuki et al.

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