Optical digital-to-analog converter and method of optically...

Details Optical digital-to-analog converter and method of optically... Optical digital-to-analog converter and method of optically...

2008-07-22

2008-07-22

Sedighian, M. R (Department: 2613)

Optical communications

Multiplex

Optical switching

C398S079000, C398S082000, C398S140000, C359S326000, C341S137000

Reexamination Certificate

active

11284865

ABSTRACT:
An optical digital-to-analog (D/A) converter and a method of optically converting digital data into analog form. In one embodiment, the optical D/A converter includes: (1) a splitter configured to receive and split an input coherent optical carrier into a plurality of mutually coherent optical carriers, (2) a switching stage coupled to the splitter and including a corresponding plurality of selector switches configured to pass or interrupt selected ones of the plurality of coherent optical carriers responsive to pattern bits, (3) an amplitude and phase offset stage coupled to the switching stage and including a corresponding plurality of amplitude and phase offset units configured to offset amplitudes or phases of passed ones of the plurality of mutually coherent optical carriers responsive to offset signals and (4) a combiner coupled to the amplitude and phase offset stage and configured to recombine the mutually coherent optical carriers to yield an optical output signal.

REFERENCES:
patent: 4989199 (1991-01-01), Rzeszewski
patent: 4991920 (1991-02-01), Peczalski
patent: 7339717 (2008-03-01), Peer et al.
patent: 2005/0238367 (2005-10-01), Chen et al.

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