Bidirectional WDM optical communication systems with bidirection

Details Bidirectional WDM optical communication systems with bidirection Bidirectional WDM optical communication systems with bidirection

1996-03-28

1998-04-21

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359130, 359160, 359179, 359341, 385 31, 385 37, 385 24, H04J 1402, H01S 300

Patent

active

057424160

ABSTRACT:
The present invention provides a bidirectional WDM optical communication system with bidirectional optical amplifiers for optically amplifying two counter-propagating WDM optical signals. The bidirectional WDM optical communication system includes a first set of optical transmitters for creating a set of east-west optical channels and a second set of transmitters for creating a set of west-east optical channels. The respective channel sets are multiplexed by optical combiners and output to an optical transmission path. A bidirectional optical amplifier optically communicates with the optical transmission path for amplifying the east-west and west-east WDM signals. In an exemplary embodiment, the bidirectional optical amplifier comprises a first and second four-port optical circulators and a section of doped optical fiber with optical pumps interconnecting the two circulators. Bragg gratings configured to reflect either the west-east or the east-west channel band are positioned in two optical paths which optically communicate with both optical circulators. The amplifier is thus configured to optically amplify both counter-propagating WDM signals. The bidirectional WDM optical system further includes two demultiplexer systems for routing the individual optical channels to their respective receivers.

REFERENCES:
patent: 5283686 (1994-02-01), Huber
patent: 5365368 (1994-11-01), Hsu et al.
patent: 5384651 (1995-01-01), Van de Voorde et al.
patent: 5563733 (1996-10-01), Mitsuda et al.
patent: 5608571 (1997-03-01), Epworth et al.

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