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An optimized all-fiber edge filter is developed, based on a one-turn macrobending bare fiber structure. The discrimination range is 16.32 dB over a wavelength range from 1500 to 1600 nm, which can be employed for wavelength measurement applications. It offers a simpler structure compared to the previously developed macrobending fiber loss edge filters, without an increase in the polarization-dependent loss.
Wang, P., Farrell, G., Wang, Q., Rajan, G.: An optimized macrobending fiber based edge filter. Photonics Technology Letters, 2007, Vol.19, no.15, pp.1136-1138. doi:10.1109/LPT.2007.901434