All optical logic using cross-phase modulation amplifiers and mach-zehnder interferometers with phase-shift devices
US6522462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Aug 23, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/70
- WIPO fieldOptics
- WIPO sectorInstruments
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 &pgr; compared with the other branch. When two branches with the &pgr; 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 &pgr;/2 to the upper branch but not to the lower branch, while the MMI combiner also adds &pgr;/2 shifts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.