Temperature compensated fiber fabry-perot filters
US5289552A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Aug 12, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3845
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides fiber Fabry-Perot filters having an adjustable temperature coefficient. Passive means and adjustable means for changing the temperature coefficients of FFPs are provided. These means allow adjustment of the temperature coefficient of the filter to minimize wavelength (or frequency) drift as a function of temperature. The means for temperature coefficient adjustment described herein are particularly useful in combination with electronic means for changing the cavity length, such as piezoelectric transducer elements. Controlling the thicknesses of epoxy used to attach PZTs in the filter fixture has been found to lead to improved reproducibility of passive temperature compensation. An adjustable means for changing the temperature coefficient of a FFP after its construction by varying the points of contact between the filter ferrules and the filter fixture is also provided. Combination of the means of temperature coefficient adjustment described herein result in significantly improved yields of FFPs having temperature drift less than about 0.1 FSR/15.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.