Optical transmission system

Details Optical transmission system Optical transmission system

1994-12-15

1996-06-04

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359140, 359158, H04J 1408

Patent

active

055238700

ABSTRACT:
In an optical transmission system between an optical subscriber unit (10; OSU) in a central office and a plurality of optical network units (20.sub.i ; ONU) in customer premises each coupled with said subscriber unit (10) through a single optical transmission line (32.sub.i), an optical switch (40) is provided for selectively coupling one of said network units (20.sub.i) to said subscriber unit (10) sequentially on time division multiplexing operation, so that no attenuation except small insertion loss by an optical switch occurs in switching. A downstream frame from said subscriber unit (10) to said network units (20.sub.i) has a plurality of time slots each of which is to be switched to a predetermined related network unit, and de-multiplexed by said optical switch. Each time slot has no identification for addressing. An upstream frame from network units are multiplexed by said optical switch. Said downstream frame and said upstream frame are multiplexed in a single optical transmission line either through time division multiplexing or through wavelength multiplexing.

REFERENCES:
patent: 5398129 (1995-03-01), Reimann
"Ti:LiNbO.sub.3 Digital Optical Switch Matrices", Okayama et al, Electronics Letters, vol. 29, No. 9, Apr. 29, 1993, pp. 765-766.
"Functional Structure of the Fiber-Optic Passive Double Star System", Kumozaki et al, IEICE Trans.Commun. vol. E75-B, No. 9, Sep. 1992, pp. 1-9.
"Introduction Approach Toward Full Fiber-Optic Access Network", Okada et al, ICC, Jun. 1991, pp. 91-95.
"Fiber-Optic Subscriber Systems for Point-to-Multipoint Transmission Architecture", Okada et al, ECOC '92, Sep.-Oct. 1992, pp. 102-105.

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