W-type fiber design for application in U- and S-band amplifiers by controlling the LP01 mode long wavelength cut-off |
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Authors: | Seongwoo Yoo Yongmin Jung Junki Kim Jhang W Lee Kyunghwan Oh |
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Affiliation: | Department of Information and Communications, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea |
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Abstract: | We propose a novel passive band-pass filtering scheme to obtain a net gain in a band-competing system using a W-type fiber waveguide, slicing a shorter wavelength gain band out of a given stimulated emission cross-section. By controlling the location of the LP01 mode cut-off, fiber design parameters are presented for obtaining a U-band gain from Tm ions and S-band from Er ions. The tolerance of the LP01 mode cut-off wavelength and the accompanying bending loss are theoretically analyzed in terms of waveguide parameters. |
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Keywords: | Fiber amplifiers W-type fiber S-band amplifier U-band amplifier |
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