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23 May 2006 Analysis and fabrication by electric-arc technique of high performance bandpass filters based on phase-shifted long period fiber gratings
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Abstract
Bandpass filters based on π-phase-shifted long-period fiber grating have been theoretically analyzed and experimentally fabricated by the electric-arc technique. Calculations and numerical simulations, based on coupled mode theory associated with the F-matrix method, have shown that the isolation of lateral rejected bands is maximum when the total length of the grating is optimised and the π-phase-shift inserted when the transmission at the desired resonance wavelength is -6.9dB. Two π-phase-shifts are introduced at optimised positions to obtain a large bandwidth of the badpass filter. We have fabricated the first bandpass filters that have lateral rejected bands isolation higher than 20 dB and bandpass filters with very large flat-top bandwidths (FWHM =19.5 nm) around 1538 nm peak, the fabricated filters are characterized by a very low insertion loss (<0.5 dB).
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Abdelrafik Malki and Georges Humbert "Analysis and fabrication by electric-arc technique of high performance bandpass filters based on phase-shifted long period fiber gratings", Proc. SPIE 6193, Reliability of Optical Fiber Components, Devices, Systems, and Networks III, 61930P (23 May 2006); https://doi.org/10.1117/12.661252
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