Open AccessAll fiber dynamic gain equalizer based on a fiber grating with rotary refractive index change
Author(s) -
Tao Zhu,
Yunjiang Rao,
Wang Ruo-kun,
Wang Jiu-ling
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.4720
Subject(s) - materials science , optics , long period fiber grating , graded index fiber , transverse plane , fiber bragg grating , refractive index , step index profile , amplifier , optical fiber , optoelectronics , physics , fiber optic sensor , structural engineering , cmos , engineering
An all-fiber dynamic gain equalizer for flattening Er-doped fiber amplifiers based on a long period fiber grating (LPFG) with rotary refractive index change induced by high-frequency CO2 laser pulses is reported, for the first time to our knowledge. Experimental results show that its transverse load sensitivity is up to 0.37dB/(g·mm-1), which is 9 times higher than that of a normal LPFG induced by the same method. In addition, it is found that the strong orientation-dependence of the transverse load sensitivity of the normal LPFG reported previously has been weakened considerably. Therefore, such a dynamic gain equalizer based on the transverse load and temperature characteristics of this novel LPFG provides a much larger adjustable range and makes packaging of the gain equalizer much easier. A demonstration has been carried out to flatten an Er-doped fibre amplifier to ±0.5dB over a 32nm bandwidth.