Temperature compensated fiber optic bypass switch
US4938554A · kind A · utility
5Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Apr 3, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable refractive index device, such as a Bragg cell, is temperature stabilized by sensing ray path deviations of a secondary diffracted beam. Two photodetectors with centers offset from the exit position of the central ray of the beam at normal temperature operation receive light energy as a function of the deviation of this ray path from the normal position. Light in each fiber is detected to derive electrical signals that are utilized to establish a correction signal to a voltage controlled oscillator which varies the frequency thereof and compensates for the diffraction deviations caused by temperature variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.