All optical logic using cross-phase modulation amplifiers and mach-zehnder interferometers with phase-shift devices
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United States of America Patent
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Feb 18, 2003
Grant Date -
Jan 2, 2003
app pub date -
Aug 14, 2001
filing date -
Jun 29, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Optical logic gates are constructed from Mach-Zehnder Interferometer (MZI) optical circuits. A multi-mode interference (MMI) splitter divides a continuous-wave input into two branches of the interferometer. Each branch has a semiconductor optical amplifier (SOA). When a logic input having a logic-high power level is applied to one of the SOA's, cross-phase modulation occurs in the SOA. The phase shift increases through the SOA. The branch coupled to the logic input has a relative phase shift of .pi. compared with the other branch. When two branches with the .pi. phase difference are combined, destructive interference occurs, producing a logic low. An MMI combiner or an equivalent phase shifter is used to combine the two branches. The MMI splitter adds a phase shift of .pi./2 to the upper branch but not to the lower branch, while the MMI combiner also adds .pi./2 shifts.
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