Apparatus and method for improving the frequency response of modulators based on the Sagnac interferometer
US6072919A · kind A · utility
2Cited by
0References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1998 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Jan 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/21
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical method and apparatus particularly useful as an intensity modulation system, in which two phase modulators are placed in the loop of a Sagnac interferometer. Selective placement of the modulators, and the amplitude of any modulation signal input to the modulators, varies the bandwidth and frequency response of the system. In a preferred embodiment, the ratio of the optical distances of the modulators from interferometric midpoint, and the ratio of modulation signal amplitudes, is about 3:1, which serves to broaden and flatten the frequency response of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.