Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2326884
