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Flat-top, wide-passband filter fabricated by CO2 laser engraved D-shaped structure within linearly chirped fibre Bragg grating

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2 Author(s)
X. Dong ; (State Key Laboratory of All Optical Network & Advanced Telecommunication Network, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, People¿s Republic of China) E-mail: ; R. Zhao

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.

Published in:

Electronics Letters  (Volume:45 ,  Issue: 19 )