Acute twist nematic liquid crystal electro-optic modulator for use in an infrared optical communication system having extinction ratio of -25db
US6094246A · kind A · utility
20Cited by
11References
10Claims
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Key dates
| Filing date | Jan 6, 1998 |
| Grant date | Jul 25, 2000 |
| Priority date | — |
| Expiry date | Jan 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1398
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0.degree. and 90.degree., and preferably between 50.degree. and 80.degree. is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios, such as greater than -25 dB. Preferably the liquid crystal entrance director differs from the polarization direction by a beta angle of about 15.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.