Related Experiment Video
Updated: Jun 13, 2026
08:32
Conducting Multiple Imaging Modes with One Fluorescence Microscope
Published on: October 28, 2018
Chemically etched conical microlenses for coupling single-mode lasers into single-mode fibers
1Bell Laboratories, Crawford Hill Laboratory, Holmdel, New Jersey 07733, USA.
Applied Optics
|April 17, 2010
Summary
A novel fiber optic lensing technique improves laser diode coupling efficiency. Etching a fiber end creates a conical or hemispherical lens, achieving low coupling losses for better optical performance.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Efficient coupling between laser diodes and single-mode fibers is crucial for optical communication systems.
- Mode mismatch between laser diodes and optical fibers leads to significant signal loss.
Purpose of the Study:
- To propose and theoretically design a simple method for creating a fiber end lens to enhance laser-to-fiber coupling efficiency.
- To experimentally validate the proposed lensing scheme and quantify coupling losses.
Main Methods:
- Selective etching of a fiber end to form a conical lens, with optional fire polishing or arc melting into a hemispherical lens.
- Theoretical modeling of the optical design for both conical and hemispherical fiber lenses.
- Experimental measurement of coupling losses using the fabricated fiber lenses.
Main Results:
- Theoretical designs predict high coupling efficiency for practical applications.
- Initial experiments demonstrated coupling losses as low as 3 dB.
- The proposed method offers a straightforward approach to mode matching.
Conclusions:
- The developed fiber end lensing technique significantly enhances laser diode to single-mode fiber coupling efficiency.
- The method is practical and cost-effective, offering a viable solution for improving optical system performance.
- Further optimization may lead to even lower coupling losses.
