Abstract
A novel method enabling the production of an ultrabroad dual-triangular filter (DTF) is proposed and numerically demonstrated, which is realized by using an optimized phase-modulated helical long-period fibre grating (PM-HLPG) operated especially at wavelengths near the dispersion-turning-point (DTP) of cladding-mode LP1,10. As a typical design example, four linearly spectral regions, each with dynamic ranges of ∼177 nm in wavelength and ∼82% in transmission loss, have been successfully achieved, which are the best results reported to date among all grating-based triangular filters. It is believed that the proposed DTF will find potential applications in broadband power-interrogated fibre sensing systems.
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