NDLI: Fabrication of wide-bandpass filters based on phase-shifted long-period fiber gratings inscribed by focused pulses of CO/sub 2/ laser

Content Provider	IEEE Xplore Digital Library
Author	Yinian Zhu Ping Shum Hui-Wen Bay Xiaoyan Chen Ching-Hwee Tan Min Yan Chao Lu
Copyright Year	2004
Description	Author affiliation: Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore (Yinian Zhu; Ping Shum; Hui-Wen Bay; Xiaoyan Chen; Ching-Hwee Tan; Min Yan; Chao Lu)
Abstract	We demonstrate the first fabrication of wide-bandpass filters based on phase-shifted long-period gratings inscribed by the mechanism of macro-deformation with focused pulses of $CO_{2}$ laser and a point-by-point technique. By introducing the π-phase shift in the middle of the grating with 500 μm of a period-length and with total number of 20 periods, the notch of resonance wavelength at 1318.55 nm of an initial long-period fiber grating is split into two symmetrical notches that are located at 1282.45 nm and 1349.75 nm, respectively, in the transmission spectrum. The passband bandwidth is as wide as 36.55 nm measured at -3 dB from maximum transmission between them, and the resonance strength of those two notches is almost the same as ~-12 dB. The temperature sensitivity is 8.8 pm/°C at a range of 23-190°C. Such fiber grating components could be used as an all-fiber filter in a laser cavity. Long-period gratings with different phase shifts are also investigated with different notches of resonance attenuations. All gratings fabricated are of a compactness to be packaged into fiber-optic based devices.
Sponsorship	Ministry of Educ. (MOE) of PR China City Univ. of Hong Kong K.C. Wong Educ. Found
Starting Page	604
Ending Page	608
File Size	279473
Page Count	5
File Format	PDF
ISBN	0780386477
DOI	10.1109/ICCCAS.2004.1346211
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-06-27
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Filters Wavelength measurement Optical device fabrication Bandwidth Fiber gratings Resonance Optical fiber devices Passband Fiber lasers Optical pulses
Content Type	Text
Resource Type	Article

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