Unidirectional amplification for bi-directional transmission usi

Details Unidirectional amplification for bi-directional transmission usi Unidirectional amplification for bi-directional transmission usi

1994-03-04

1995-09-19

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359127, 359634, H04B 900

Patent

active

054521246

ABSTRACT:
A device in accordance with the invention uses a novel four-port wavelength-division multiplexing (WDM) filter and a single erbium-doped optical amplifier (EDFA) to implement a dual wavelength bi-directional (single fiber) optical amplifier module. A system using an amplifier module in accordance with the invention, advantageously allows communication network managers to simultaneously reduce the cost of signal amplification hardware across a fiber optic network, increase fiber utilization, simplify field installation and maintenance operations, and maintain adherence to conventional protection philosophies such as "one system per fiber."

REFERENCES:
patent: 4849043 (1990-02-01), Mochizuki et al.
patent: 4910727 (1990-03-01), Fussganger
patent: 4972513 (1990-11-01), Mochizuki et al.
patent: 5058103 (1991-10-01), Shimizu
patent: 5107358 (1992-04-01), Hodgkinson et al.
patent: 5295011 (1994-03-01), Heise
patent: 5375010 (1994-12-01), Zervas et al.

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