Self-aligning universal beam coupler

TL;DR

This paper introduces a self-aligning beam coupler that automatically adapts to arbitrary input beams for efficient coupling into single-mode guides, with broad applications in integrated optics and other wave systems.

Contribution

It presents a novel adaptive coupling device using feedback loops for automatic alignment and mode matching, applicable across various wave types and integrated platforms.

Findings

Achieves automatic beam coupling with no manual adjustment.

Compatible with integrated optics components like phase shifters and interferometers.

Potential for simultaneous separation of multiple overlapping beams.

Abstract

We propose a device that can take an arbitrary monochromatic input beam and couple it into a single-mode guide or beam. Simple feedback loops from detectors to modulator elements allow the device to adapt automatically to any specific input beam form. Potential applications include automatic compensation for misalignment and defocusing of an input beam, coupling of complex modes or multiple beams from fibers or free space to single-mode guides, and retaining coupling to a moving source. Straightforward extensions allow multiple different overlapping orthogonal input beams to be separated simultaneously to different single-mode guides with no splitting loss in principle. The approach is suitable for implementation in integrated optics platforms that offer elements such as phase shifters, Mach-Zehnder interferometers, grating couplers, and integrated monitoring detectors, and the basic approach is applicable in principle to other types of waves, such as microwaves or acoustics.