Bidirectional optical communication device and bidirectional...

Details Bidirectional optical communication device and bidirectional... Bidirectional optical communication device and bidirectional...

2005-08-23

2005-08-23

Sedighian, M. R. (Department: 2633)

Optical communications

Transmitter and receiver system

Including optical waveguide

C398S207000, C398S214000

Reexamination Certificate

active

06934478

ABSTRACT:
A bidirectional optical communication device satisfies a condition of θfb≦0≦θfaor θfa≦0≦θfbwhen θfaand θfbare 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 θfaand θfbare expressed as the follows:in-line-formulae description="In-line Formulae" end="lead"?θfa=Sin−1[{n0Sin(θL+Sin−1(NA)
0+θT)}
f]−θTin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?θfb=Sin−1[{n0Sin(θL−Sin−1(NA)
0+θT)}
f]−θTin-line-formulae description="In-line Formulae" end="tail"?where nfand nodenote 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.

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Copy of Japanese Office Action issued on Dec. 14, 2004.

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