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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).
We propose 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 hollow optical fiber (HOF), and a multimode fiber (MMF).
An optimized high refractive index overlay can be coated on the surface of a thin cladding long period fiber grating to achieve an enhanced tuning range and a stable resonant peak depth.
We have fabricated a broadband long period grating (LPG) on hollow optical fiber (HOF) by using femtosecond laser pulses of 785.5 nm. The filter showed a low insertion loss of 1.7 dB, coupling strength more than 8 dB, and very broad full width at half maximum (FWHM) of 160 nm.
We fabricated 1-D diffraction grating on the end surface of cleaved hollow optical fibers with a direct inscribing method using femtosecond laser pulses, and measured the beam shape patterns in near and far fields. We confirmed near and far fields beam patterns generated by diffraction grating and ring shaped core.
We propose a new type of all-fiber bandwidth tunable rejection filter using cascaded helicoidal long-period fiber gratings in single-mode optical fiber and report controllable broadband rejection characteristic with low insertion loss and polarization dependent loss.
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