title: Compact tunable multibandpass filters based on liquid-filled photonic crystal fibers.
abstract: We demonstrated a compact tunable multibandpass filter with a short size of about 9 mm and a high wavelength-tuning sensitivity of up to -2.194  nm/°C by means of filling a liquid with a high refractive index of 1.700 into the air holes of a photonic crystal fiber (PCF). Such a PCF-based filter maintains an almost constant bandwidth and a large extinction ratio of more than 40 dB within the whole wavelength tuning range of more than 100 nm. Moreover, the transmission spectrum of the PCF-based filter is insensitive to the stretch force and the curvature of the fiber.
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Liu
authors.forename: Yiping
authors.initials: Y
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Sun
authors.forename: Changrui
authors.initials: C
authors.lastname: Liao
authors.forename: Jun
authors.initials: J
authors.lastname: Song
authors.forename: Kaiming
authors.initials: K
authors.lastname: Yang
authors.forename: Guanjun
authors.initials: G
authors.lastname: Wang
authors.forename: Qiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Guolu
authors.initials: G
authors.lastname: Yin
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Zhou