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All optical logic using cross-phase modulation amplifiers and mach-zehnder interferometers with phase-shift devices
All optical logic using cross-phase modulation amplifiers and mach-zehnder interferometers with phase-shift devices
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机译:使用交叉相位调制放大器和带相移装置的马赫曾德尔干涉仪的所有光学逻辑
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摘要
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 compared with the other branch. When two branches with the 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 /2 to the upper branch but not to the lower branch, while the MMI combiner also adds /2 shifts.
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