Broadband Mode Converters by Femtosecond-Laser-Light Refractive-Index Tailoring

Author

Savolainen, Juha-Matti ; Kristensen, P. ; Gruner-Nielsen, L. ; Balling, Peter

Author_Institution

Dept. of Phys. & Astron., Univ. of Aarhus, Aarhus, Denmark

Volume

26

Issue

14

fYear

2014

fDate

July15, 15 2014

Firstpage

1454

Lastpage

1457

Abstract

Possible designs for a new type of mode converters based on microstructuring the refractive-index profile of an optical fiber with ultrashort laser pulses are proposed and characterized numerically. Both LP₀₁-LP₀₂ and LP₀₁-LP₁₁ converters exhibit in excess of 20-dB extinction ratio over more than 200-nm bandwidth with moderate losses. The length of the converters is only a few hundred micrometers, making them some of the shortest mode converters available.

Keywords

extinction coefficients; laser materials processing; optical design techniques; optical fibre fabrication; optical fibre losses; refractive index; LP₀₁-LP₀₂ converter; LP₀₁-LP₁₁ converter; broadband mode converter design; converter length; extinction ratio; femtosecond-laser-light refractive-index tailoring; moderate losses; optical fiber; refractive-index profile microstructuring; ultrashort laser pulses; Couplings; Extinction ratio; Optical fiber communication; Optical fiber couplers; Optical fiber devices; Optical fiber dispersion; Material processing; optical fiber devices;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2326884

Filename

6826548