Patents by Inventor Arthur T. Nakagawa

Arthur T. Nakagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pure-silica core dual-mode optical fiber
    Patent number: 5329607
    Abstract: 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.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: July 12, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Neil T. Kamikawa, Arthur T. Nakagawa