Multiwave optical buffer using loop mirror

Details Multiwave optical buffer using loop mirror Multiwave optical buffer using loop mirror

1999-10-26

2003-02-11

Negash, Kinfe-Michael (Department: 2633)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S199200, C359S199200

Reexamination Certificate

active

06519058

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multiwave optical buffer using a loop mirror, and in particular to an improved multiwave optical buffer using a loop mirror which can store cells having low priority, sequentially output the cells in a preferable time, and arrange and output cells which are wave-multiplexed in a wave-multiplexed system and inputted at the same time, on a time axis in accordance with an electrical external control signal, in order to prevent conflicts among the cells to be outputted to an identical channel on a high-speed time division multiplexing local network or backbone.
2. Description of the Background Art
Recently, a demand of the users for high quality service has been sharply increased, thus requiring a high-speed network. However, it is difficult to prevent conflicts among cells in accordance with an electrical method by a photoelectric conversion on a predetermined switching node. In addition, an optical buffering method by electric control has been suggested (K. L. Hall, Member, IEEE, and K. A. Rauschenbach, Member, IEEE, “All-Optical Buffering of 40-Gb/s Data Packets”, IEEE Photonics Technology Letters. Vol. 10, No. 3, March 1998).
According to the optical buffering method, when input cells are stored, 90% of the cells are duplicated and discarded, 10% of the cells are inputted to a loop and reproduced to 100%, 90% of the reproduced cells are discarded again, and 10% of the cells are inputted to the loop and reproduced to 100%. There is a disadvantage in that the above-described method additionally requires a structure for processing the discarded cells.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a multiwave optical buffer using a loop mirror which can transmit cells to a preferable node in accordance with electric control without causing conflicts among the cells, when the cells having various waves reach a single node at the same time on a high-speed network.
In order to achieve the above-described object of the present invention, there is provided a multiwave optical buffer using a loop mirror, including: a loop mirror wave-dividing and storing cells inputted from an input terminal at an initial stage, and reflecting the cells in an input direction; a cell input unit controlling a gain and optical power of the cells reflected by the loop mirror, and re-inputting the cells into the loop mirror; and a controller controlling an external output according to waves in regard to the cells inputted and stored in the loop mirror.


REFERENCES:
patent: 6175433 (2001-01-01), Patel et al.
patent: 156878 (2000-06-01), None
K.L. Hall, et al.; “All-Optical Buffering of 40-Gb/s Data Packets”;IEEE Photonics Technology Letters; Mar. 1998; vol. 10, No. 3, p. 442-444.

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