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Fabrication and characterization of a broadband long-period grating on a hollow optical fiber with femtosecond laser pulses

: Ha, W.; Oh, K.; Jung, Y.M.; Jun, K.K.; Shin, W.; Sohn, I.B.; Ko, D.K.; Lee, J.M.

Journal of the Korean Physical Society 53 (2008), No.6, pp.3814-3817
ISSN: 0374-4884 (Print)
ISSN: 1976-8524 (Online)
Journal Article
Fraunhofer IOF ()
long-period grating; hollow optical fiber; band rejection filter; femtosecond laser

We have fabricated broadband long-period gratings (LPGs) on hollow optical fibers (HOFs) by 15 corrugating slots with various widths by point-by-point exposure of a Ti:sapphire femotosecond laser. The corrugated LPGs showed unique broadband rejection whose FWHM extended to 190 nm with a low insertion loss of less than 1 dB. The maximum coupling strength was 8.5 dB, which is a significant improvement in comparison with previous HOF acousto-optic tunable filters (AOTFs). The center wavelength and coupling strength of the resonant peak could be systematically controlled by modulating the width of the corrugation.