US 6,788,834 B2 · Optoacoustic frequency filter

Abstract

In a tunable optoacoustic filter, a portion of the optical fiber is coiled around and placed at least partially against a rounded shell equipped with at least one longitudinal slit having an emitter and an absorber on both sides of the slit in contact with the shell or the optical fiber. The emitter transmits elastic waves along the shell and therefore along the fiber to the point of absorber. Coiled configuration of the optical fiber along with various positions of emitters and absorbers are presented allowing to widen the functional range of operation of the filter by increasing the usable length of the optical fiber subject to acoustic oscillations. As a result a reflection/conversion coefficient of up to 0.999 and the filtration band of 1-10 kHz are obtainable.

Claims33

Dependent claims

An optoacoustic frequency filter comprising:

at least one optical fiber, said fiber arranged to form at least one coil having at least one turn, said coil having a proximal end and a distal end, said distal end located in a vicinity of said proximal end,
at least one emitter of elastic deformation waves attached to said proximal end of said coil, and
at least one absorber of said elastic deformation waves attached to said distal end of said coil,
wherein activation of said emitter causing an elastic deformation wave to initiate at said proximal end of said optical fiber and propagate along thereof in a path of said coil through to said absorber at the distal end of said coil.

1 more element

Dependencies are inferred from the claim text.

Optoacoustic frequency filter

Life of this patent

Optoacoustic frequency filter

Life of this patent

Abstract

Claims33