Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-07-17
2000-12-12
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359135, 359173, H04J 1408, H04B 1012
Patent
active
061606529
ABSTRACT:
An optical address decoder, and an associated method for routing optical data packets. One embodiment of the decoder includes a plurality of waveguides, and semireflective elements that define, within each waveguide, a resonant cavity, each resonant cavity being of a different length. Addresses are encoded as equal spacings of sequences of optical pulses. An address to be decoded is directed simultaneously to all waveguides. Resonance is set up only in the waveguide whose resonant cavity matches the optical pulse spacing of the address. Another embodiment of the decoder includes a plurality of waveguides of different lengths, with the length difference between adjacent waveguides corresponding to a certain propagation time interval. Each waveguide terminates in an optoelectronic detector. Addresses are encoded as patterns of bits spaced according to this propagation time interval, with optical pulses representing "1" bits. An address to be decoded is directed, bit by bit, simultaneously to all waveguides. When the last bit of the address reaches the end of the shortest waveguide, each of the other bits reaches the end of a correspondingly longer waveguide. The encoded address is reflected in the consequent activation pattern of the detectors.
REFERENCES:
patent: 5002350 (1991-03-01), Dragone
patent: 5477364 (1995-12-01), Pearson
patent: 5712937 (1998-01-01), Asawa et al.
Friedman Mark M.
Lynx Photonic Networks Ltd.
Pascal Leslie
Sedighjan M. R.
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