The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2005
Filed:
Apr. 24, 2002
Hideaki Fujita, Shiki-gun, JP;
Yorishige Ishii, Yamatotakada, JP;
Toshihiro Tamura, Shiki-gun, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A bidirectional optical communication device satisfies a condition of θ≦0≦θor θ≦0≦θwhen θand θare angles of inclination between an optical axis of an optical fiber and transmission light after incidence with a numerical aperture NA at an outermost periphery, and θand θare expressed as the follows:θ=SinSin(θ+Sin()/+θ)}/]−θθ=SinSin(θ−Sin()/+θ)}/]−θwhere nand ndenote refractive indexes of a core of the optical fiber and air, respectively. The bidirectional optical communication device is capable of decreasing restraint of a transmission distance by reducing fluctuation of reception efficiency by the transmission distance and reducing interference between transmission light and reception light.