Polarization-independent optical directional coupler switch/modulator
US4243295A · kind A · utility
23Cited by
3References
3Claims
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Key dates
| Filing date | Sep 19, 1979 |
| Grant date | Jan 6, 1981 |
| Priority date | — |
| Expiry date | Sep 19, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Because orthogonally polarized optical waves see unequal electrooptic coefficients and refractive indices for the same applied voltage, it has been difficult to obtain efficient switching of arbitrarily polarized waves. This difficulty is resolved in a reverse .DELTA..beta. directional coupler (10, 11) which employs spatial tapering of the distance between waveguides (D(z)) for efficient through-coupling, and the appropriate choice of effective coupling strengths (s.sub.TE, s.sub.TM) for the two polarizations for efficient cross-coupling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.