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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsNeil T. Kamikawa, Arthur T. Nakagawa
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An improved dual-mode optical fiber provides for an improved combination of spectral attenuation, bending losses and modal noise and modal dispersion for long-haul transmission at 1550 nm. The dual-mode optical fiber has a pure-silica core and a silica cladding depressed with fluorine so that the core and cladding have a relative refractive index difference, .DELTA., of about 0.72% and a second-mode cutoff wavelength, .lambda..sub.c, at 1630 nm. Optionally, a non-silica core and cladding can be used for long-haul transmission at 1550 nm. when the core and cladding have a relative refractive index difference, .DELTA., of about 0.72% and a second-mode cutoff wavelength, .lambda..sub.c, at 1630 nm.
An improved dual-mode optical fiber in which dual-mode propagation having a cutoff wavelength greater than an operating wavelength of both the fundamental LP.sub.01 and second-order LP.sub.11 modes to provide an improved combination of spectral attenuation, bending losses and modal noise and modal dispersion for long-haul transmission at said operating wavelength of about 1550 nm comprising:
An improved dual-mode optical fiber in which dual-mode propagation having a cutoff wavelength greater than an operating wavelength of both the fundamental LP.sub.01 and second-order LP.sub.11 modes to provide an improved combination of spectral attenuation, bending losses and modal noise and modal dispersion for long-haul transmission at about 1550 nm comprising:
Dependencies are inferred from the claim text.