Accession Number : ADD015693

Title :   Thermal Phase Modulator and Method of Modulation of Light Beams by Optical Means.

Descriptive Note : Patent, Filed 31 Oct 91, patented 24 Nov 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bobb, Lloyd C ; Krumboltz, Howard D

Report Date : 24 Nov 1992

Pagination or Media Count : 9

Abstract : Apparatus is provided for modulating the phase of a coherent light beam propagating through the core of a single-mode waveguide. A light-absorbing element is connected to a portion of the cladding of the waveguide such that there is a thermal interface therebetween. A means is provided for launching light into the portion of the cladding of the waveguide having the light-absorbing element connected thereto. The light-absorbing element absorbs the light and produces beat in proportion to the light's energy. The heat thus produced is transferred to the waveguide, changing its optical path length and varying the phase of the light propagating therethrough. The intensity of the light launched into the cladding is variable and is controlled by a power supply. The modulator may be used in an interferometer in which a signal is directed to the power supply to control the light intensity for various purposes.

Descriptors :   *LIGHT MODULATORS, *FIBER OPTICS, *PATENTS, CLADDING, CONTROL, CORES, ENERGY, HEAT, INTENSITY, INTERFACES, INTERFEROMETERS, LENGTH, PATHS, PHASE, POWER SUPPLIES, SIGNALS, VARIABLES, OPTICAL WAVEGUIDES, REFRACTIVE INDEX

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE