Open AccessA semi-weakly confined erbium-doped waveguide amplifier with double-layered buffer/cladding
Author(s) -
Hengsheng Tang,
YiGang Li,
Yanwu Zhang,
Yingfeng Li,
Hao Li,
Xiaoguang Tu,
Xiang Wu,
Liying Liu,
Lei Xu
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.009844
Subject(s) - cladding (metalworking) , materials science , waveguide , optics , buffer (optical fiber) , erbium , core (optical fiber) , optical amplifier , optoelectronics , amplifier , doping , laser , physics , telecommunications , cmos , computer science , metallurgy , composite material
A semi-weakly confined waveguide structure was designed and fabricated. This waveguide structure has a 350 nm thin core layer. Its optical mode field is weakly confined in vertical direction but is strongly confined laterally. The waveguide can support a nearly circular optical field distribution that matches well with a single-mode fiber. An erbium-doped waveguide amplifier (EDWA) with the new waveguide structure was fabricated by sol-gel method. The EDWA has a passive core and double-layered buffer/cladding. A small coupling loss of 0.4 dB/facet and an internal gain of 1.9 dB via evanescent wave amplification near 1550 nm were obtained.