“…In contrast to conventional step index single mode fibers, W-type fibers have the fundamental LP 01 mode cut-off at a long wavelength to provide a short wavelength pass filter characteristic as well as negative chromatic dispersion [6][7][8][9][10][11]. In particular, parametric analysis on waveguide structure and bending loss studies have been established in the silica glass window around 1550 nm for the application of low loss, passive transmission fibers.…”
“…In contrast to conventional step index single mode fibers, W-type fibers have the fundamental LP 01 mode cut-off at a long wavelength to provide a short wavelength pass filter characteristic as well as negative chromatic dispersion [6][7][8][9][10][11]. In particular, parametric analysis on waveguide structure and bending loss studies have been established in the silica glass window around 1550 nm for the application of low loss, passive transmission fibers.…”
“…W-type fibers are usually used as dispersion compensation fibers (DCFs) and dispersion shifted-fibers (DSFs). Now they are also used for the band shift in fiber amplifiers and fiber lasers [1][2][3][4][5][6][7] . Engineers of Lightwave Electronics (Mountain View, CA) reported a W-type erbium-doped fiber (EDF) operating in S-band [8] , which opened up a new field of EDF positive devices.…”
We give the characteristic equation of a W-type fiber by solving Maxwell's equations along with boundary conditions at the interfaces. The cutoff condition of the fundamental mode is examined, and a novel W-type fiber working in S-band is designed.
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