Temperature-compensating arrangements and methods for optical fiber

A temperature compensated fiber arrangement comprising:

• a fiber holder comprising a first holder portion made of a first material having a positive coefficient of thermal expansion and a second holder portion made of a second material having a negative coefficient of thermal expansion, the first and second holder portions being arranged end-to-end such that an end-to-end arrangement with a combined coefficient of thermal expansion results;
• a length of fiber;
• a holding mechanism adapted to hold the length of fiber with respect to the holder so as to cause a change in the length of fiber equal to a change in length of the fiber holder which compensates for a change in index of refraction of the length of fiber as a function of temperature.

A stretchable optical transmission medium holder comprising a first portion made of a first material having a positive coefficient of thermal expansion and a second portion made of a second material having a negative coefficient of thermal expansion,

• the first and second portions being arranged to form an end-to-end axially in contact arrangement such that a selected combined coefficient of thermal expansion for the fiber holder results.