All-optical signal processing apparatus of non-linear fiber loop

Details All-optical signal processing apparatus of non-linear fiber loop All-optical signal processing apparatus of non-linear fiber loop

1994-12-20

1997-01-07

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359128, 385 32, 356345, H04J 1402

Patent

active

055923194

ABSTRACT:
An all-optical signal processing apparatus of a non-linear fiber loop mirror type comprises a very high-speed all-optical switch that can be used as a reverse multiplexed switch in a high-speed time division optical communication. The apparatus includes a non-linear loop mirror for switching signal light by adjusting light using the non-linear effect of an optical fiber and the characteristics of a sagnac interferometer as the fundamental configuration. The all-optical switch is constructed so that another adjustment light having an appropriate time delay with respect to an existing adjusting light is additionally introduced in order to compensate for the limitation on the switching bandwidth imposed by the walk-off between adjusting and signal lights in a conventional non-linear optical fiber loop mirror. This compensates for the cross-talk of the noise signals due to DC components generated in the conventional apparatus. A switching window of a desirable size is obtained by properly adjusting the time delay between two adjusting lights and resolving the bandwidth limitation of the switch due to the walk-off of the adjusting and signal lights according to the timing jitter of signal light.

REFERENCES:
patent: 5402231 (1995-03-01), Udd

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