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We report an all-fiber wavelength tunable bandpass filter with multi-mode to single-mode converting property via serially concatenated structure of a helicoidal long-period fiber grating (HLPFG), a ring-core hollow optical fiber (rcHOF), and a multimode fiber (MMF).
All-optical wavelength tuning in a waveguide-type Solc filter based on a Ti:PPLN waveguide has been demonstrated for the first time by ultraviolet illumination. The measured wavelength tuning rate as a function of the UV intensity was about -26.42 nm/W cm-2.
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