Title :
Flat-top, wide-passband filter fabricated by CO2 laser engraved D-shaped structure within linearly chirped fibre Bragg grating
Author :
Dong, Xiaochun ; Zhao, Rong
Author_Institution :
State Key Lab. of All Opt. Network & Adv. Telecommun. Network, Beijing Jiaotong Univ., Beijing, China
Abstract :
A new, yet simple method for fabricating high-quality bandpass filters is proposed. Utilising the CO2 laser irradiation along the linearly chirped fibre Bragg grating, a D-shaped structure is engraved and a bandpass filter with nearly 100% transmissivity, >0.6 nm 3 dB bandwidth, <0.1 dB flat-top ripple and >71 dB/nm slope at 3 dB amplitude response is obtained.
Keywords :
Bragg gratings; band-pass filters; laser beam applications; optical fibre fabrication; optical fibre filters; CO2 laser irradiation; D-shaped structure; amplitude response; flat-top ripple; flat-top wide-passband filter; linearly chirped fibre Bragg grating; transmissivity;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2009.1970
