Wavelength selective optical coupler
AssigneeHer Majesty the Queen in right of Canada, as represented by the Minister of National Defence of Her Majesty's Canadian Government
InventorRobert I. MacDonald
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Abstract
An optical coupler for a fiber optic communication system, which couples one band of wavelengths out of the fiber while allowing others to be carried further. This allows wavelength division multiplexing of different signals within a single fiber. The preferred embodiment of the invention is comprised of a waveguide having aperiodic corrugations in one wall and a Fabry-Perot type resonator enclosing the waveguide around the corrugations with its axis transverse thereto.
Claims7
A wavelength-selective optical signal coupler comprising:
- a. An elongated optical waveguide having a section containing a plurality of blazed corrugations, said corrugations including alternating projections and spaces along a wall parallel to the longitudinal axis of said waveguide, said waveguide including a width dimension normal to said longitudinal axis and measured between the maximum outermost surfaces of said waveguide and a longitudinal spacing dimension between adjacent projections, at least one of said dimensions varying progressively along the length of the waveguide in the section having the blazed corrugations so as to control the bandpass of the coupler;
- and
- b. a Fabry-Perot type resonator having longitudinal reflective walls spaced about said waveguide section, one of said reflective walls being leaky and passing a bandwidth signal resonant with said resonator.
Dependencies are inferred from the claim text.