Stable wavelength division multiplex ring network

Details Stable wavelength division multiplex ring network Stable wavelength division multiplex ring network

1997-09-15

2000-02-15

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359124, 370222, H04B 1020, H04B 1008, H04J 1400

Patent

active

060259418

ABSTRACT:
We have recognized that in a Wavelength Division Multiplex (WDM) ring network with a closed loop, the possibility of lasing at Amplified Spontaneous Emissions (ASE) wavelengths exists. In accordance with the present invention, we provide a technique for protecting against lasing in a WDM ring network comprising a plurality of serially connected node links, each node link including a segment of optical fiber and an access node site for adding or dropping one or more active wavelength channels to a transmission bandwidth of the network. The protection means changes the optical transmission characteristics of the transmission bandwidth of the network to ensure that the network loop gain at any wavelength is always less than the network loop loss.

REFERENCES:
patent: 5680235 (1997-10-01), Johansson
patent: 5717796 (1998-02-01), Clendening
patent: 5870212 (1999-02-01), Nathan et al.

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