Method and system for maintaining an optical path

Details Method and system for maintaining an optical path Method and system for maintaining an optical path

1997-12-15

1999-07-27

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359177, H04J 1402

Patent

active

059300175

ABSTRACT:
Optical loop-back is provided within an optical restoration system of an optical communication network. According to one embodiment, an optical restoration system includes first and second spare optical links (also called restoration paths) optically coupled in parallel between first and second optical cross-connect switches. Each restoration path includes a light regenerator and an optical amplifier. First and second optical cross-connect switches are each switched to provide respective optical loop-back paths between the first and second restoration paths or spare links. In one example, the optical loop-back paths can be configured within the optical cross-connect switches. In another example, the optical cross-connect switches are configured to couple optical signals between an external loop-back coupler and the first and second restoration paths or spare links. According to another embodiment, the first and second optical cross-connect switches are each switched to provide respective optical loop-back paths between different WDM channels in a bidirectional restoration path or spare link. In one example, the optical loop-back paths can be configured within the optical cross-connect switches. In another example, the optical cross-connect switches are configured to couple optical signals for different WDM channels between an external loop-back coupler and the bi-directional restoration path or spare link. Through loop-back connections, optical signals from light regenerators can travel along an idle restoration paths to squelch false alarms by light regenerators and to keep the optical amplifiers stabilized. Through loop-back connections, optical signals from light regenerators can also travel along a working path to squelch false alarms by light regenerators and to stabilize optical amplifiers in the working path prior to normalization.

REFERENCES:
patent: 5493432 (1996-02-01), Yoneda
patent: 5627889 (1997-05-01), Eslambolchi
patent: 5663820 (1997-09-01), Shiragaki
patent: 5739935 (1998-04-01), Sabella
patent: 5790294 (1998-08-01), Horiuchi et al.
Fee et-al, "EDFA Applications in the Terrestrial Network and Future Directions" MCI Telecommunications, pp. 289-297.

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