Tolerant low-loss three-lens coupling system for 1.48-μm unstable-cavity lasers

Author

Delepine, S. ; Boubal, E. ; Gerard, E. ; Fillion, T. ; Salet, P.

Author_Institution

OPTO+, Marcoussis, France

Volume

12

Issue

3

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

254

Lastpage

256

Abstract

A 1.48-μm unstable-cavity laser is coupled into single-mode fiber using three microlenses. Reproducible coupling of very high power is demonstrated with different types of lenses (plano-convex or biconvex, with different apertures). Over 550 mW in single-mode fiber (SMF) were reproducibly reached; to our knowledge, it is the highest power coupled into an SMF from a single semiconductor laser at this wavelength. Tolerance measurements on all of the coupling elements of a three-lens system are reported for the first time; an unexpected very large tolerance an the axial displacement of the second lens was measured. Results and interpretation with the aid of Gaussian and aberration simulations are also presented.

Keywords

aberrations; laser accessories; laser beams; laser modes; laser stability; microlenses; optical fibre couplers; optical fibre losses; ridge waveguides; semiconductor lasers; waveguide lasers; 1.48 mum; 550 mW; Gaussian simulations; aberration simulations; apertures; axial displacement; biconvex lens; coupling elements; lenses; low-loss three-lens coupling system; microlenses; plano-convex lens; reproducible coupling; semiconductor laser; single-mode fiber; three-lens system; tolerance measurements; unstable-cavity lasers; Apertures; Displacement measurement; Fiber lasers; Lenses; Microoptics; Optical coupling; Power lasers; Semiconductor lasers; Time measurement; Wavelength measurement;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.826905

Filename

826905