TEMPERATURE COMPENSATED FIBER FABRY-PEROT FILTERS

摘要

This invention relates to FFPs with improved means for alignment of optical fibers. The invention provides ferrule holders (20B) with shaped ferrule passageways (22), as components of FFP alignment fixtures, in which optical fiber ends can be readily aligned using the ferrule rotary alignment method. Ferrule holders (20B) for use in temperature compensated FFPs include those fabricated from low temperature coefficient alloys, such as Kovar<TM>. Ferrule holders optionally have a composite structure facilitating temperature compensation required for applications to PZT-tuned FFPs. These ferrule holders have a core and peripheral portion made of materials having different thermal expansion coefficients. The holder core in contact with the ferrule (10, 11) is made of a material having a thermal expansion coefficient substantially matched to that of the ferrule material. In addition, ferrule holders are provided with a means for changing the points of contact between a secured ferrule and its holder which allows wavelength drift as a function of temperature in FFPs to be adjusted.