JPH0245514U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an optical fiber type phase modulator showing an embodiment of this invention, and FIG. 2 is a side sectional view of a conventional optical fiber type phase modulator.

Claims (1)

[Claims for Utility Model Registration] An outer electrode and an inner electrode are uniformly formed on the outer and inner circumferential surfaces of a cylindrical piezoelectric element, and an optical fiber is wound on the outer electrode, and one end of the optical fiber is wound on the outer electrode. An optical signal is incident on the optical fiber, the optical signal is phase-modulated by a modulation signal applied between the external electrode and the internal electrode, and the phase-modulated optical signal is emitted from the other end of the optical fiber. In the fiber phase modulator, a cylindrical support column having an outer diameter smaller than the inner diameter of the piezoelectric element is arranged coaxially in a hollow part of the piezoelectric element, and one end of the support column extends outside the hollow part. An elastic body is filled between the support column and the inner circumferential surface to fix them to each other, and the elastic body does not interfere with the mechanical vibration of the piezoelectric element, and the mechanical vibration is transmitted to the support column. An optical fiber type phase modulator, which is made of a material that prevents transmission of light, and has one end of the extended support column fixed to a housing.