Optical waveguides – Optical fiber waveguide with cladding – Utilizing nonsolid core or cladding
Reexamination Certificate
2007-06-05
2007-06-05
Connelly-Cushwa, Michelle (Department: 2874)
Optical waveguides
Optical fiber waveguide with cladding
Utilizing nonsolid core or cladding
C385S123000
Reexamination Certificate
active
10523460
ABSTRACT:
A single mode fiber is provided which is suitable for high-speed, large-capacity optical communication and for optical wiring. The single mode fiber has a first cladding region with a uniform refractive index, a core region with a refractive index higher than that of the first cladding region, and a second cladding region including at least four air hole regions placed in the first cladding region. Optimization can be achieved by making the distance from the center of the core region to the air hole regions equal to 2–4.5 times the core radius, and the air hole radius equal to or greater than 0.2 times the core radius. It is preferable the core radius be 3.7–4.8 μm, the relative index difference of the core region from the first cladding region be 0.3–0.55 %.
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Hogari Kazuo
Nakajima Kazuhide
Sankawa Izumi
Tajima Katsusuke
Zhou Jian
Connelly-Cushwa Michelle
Nippon Telegraph and Telephone Corporation
Workman Nydegger
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