Theoretical and experimental studies of a spot-size transformer with integrated waveguide for polarization insensitive optical amplifiers

Author

Mersali, Boumedi?©nne ; Bruckner, Hans Josef ; Feuillade, Monique ; Sainson, Serge ; Ougazzaden, Abdallah ; Carenco, Alain

Author_Institution

Lab. de Bagneux, CNET, Bagneux, France

Volume

13

Issue

9

fYear

1995

fDate

9/1/1995 12:00:00 AM

Firstpage

1865

Lastpage

1872

Abstract

The simple fabrication technology of an active waveguide for polarization insensitive optical amplifiers, integrated with tapers and a passive waveguide for fiber coupling, is presented. The spot size transformation along the taper, yielding a mode expansion factor of more than 9 in horizontal direction and about 2 in vertical direction, is experimentally verified and the results are compared to theoretical computations. Using a cleaved single mode fiber, the coupling loss is as low as 2.6 dB with -1-dB positional tolerances of 2.2 μm and 1.5 μm in vertical and horizontal directions. Besides relaxing on fiber coupling, the large spot size transformation in horizontal direction allows for a drastic reduction of the reflection coefficient to less than 10^-3 at a facet tilted by 4° with respect to the waveguide axis

Keywords

III-V semiconductors; gallium arsenide; gallium compounds; indium compounds; integrated optoelectronics; light polarisation; optical fibre couplers; semiconductor lasers; waveguide lasers; 1.5 mum; 2.2 mum; InP-InGaAsP; InP-InGaAsP spot size transformer; active waveguide; cleaved single mode fiber; coupling loss; fabrication technology; fiber coupling; horizontal direction; integrated waveguide; mode expansion factor; passive waveguide; photonic integrated circuits; polarization insensitive optical amplifiers; positional tolerance; reflection coefficient; spot size transformation; spot-size transformer; tapers; vertical direction; waveguide axis; Integrated optics; Optical coupling; Optical device fabrication; Optical fiber amplifiers; Optical fiber polarization; Optical reflection; Optical waveguide theory; Optical waveguides; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

Conference_Location

9/1/1995 12:00:00 AM

ISSN

0733-8724

Type

jour

DOI

10.1109/50.464736

Filename

464736