Temperature-compensating device and electro-optic transponder implementing such a device

The device according to the invention consists of a support member (23) and at least one end element (24), both configured and arranged, relative to each other, such that they form a cavity of length (ΔL) axially limited by two walls, the position of which, relative to each other, varies inversely to the variation in ambient temperature, with a temperature increase causing the walls to move towards one another and vice versa. A linear structure incorporating the device of the invention decreases in length as the temperature increases and vice versa. The invention also relates to electro-optical transducers having a linear-structure piezoelectric actuator that alters the length of an optical fiber segment constituting the laser source of the transducer, and incorporating such a device at the actuator in order to compensate, by adjusting the length of the fiber segment, for the variations in wavelength induced in the laser by the temperature variations.