Optical waveguide channel device

An optical waveguide channel device, comprising:

• a substrate;
• multiple cores located on said substrate, each of said multiple cores for guiding a coherent light beam, wherein each of said cores has an entry end wherein coherent light enters each respective core and an exit end;
• wherein coherent light beams exists in said respective cores, said entrance ends being located at an entry edge of said substrate and said exit ends being located at an exit edge of said substrate;
• wherein the distances between axes of adjacent cores of said multiple cores are smaller at the exit edge than at the entry edge of said substrate, and wherein a single waveguide mode is present in a specific area of at least one of said multiple cores located between said entry end of said at least one core and said exit end of said at least one core;
• wherein an area of cross-section perpendicular to an axis of said at least one of said multiple cores is larger at the entry end than at said specific areas, and wherein said reduction in cross-sectional area has a tapering angle of 0.05° or less;
• and
• wherein said exit end of said at least one of said multiple cores is different than the cross-sectional area of said at least one core at said specified area.

A method of designing an optical waveguide channel device, comprising the steps of:

• providing a substrate;
• providing multiple cores to guide coherent light beams located on the substrate wherein distances between the axes of adjacent cores are smaller at a first edge of said substrate than at a second edge of said substrate, wherein said step of providing multiple cores includes for at least one core the steps of:
• providing a first section of said at least one core;
• providing a second curved section of said at least one core;
• providing a third section of said at least one core;
• and
• wherein said second, curved section is configured such that a single waveguide mode is present, and wherein at least one of said first section and said third section has a cross-section area larger than said second section.