Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-03-07
1999-01-12
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
385 31, G02B 632
Patent
active
058599401
ABSTRACT:
An optical device employing a GRIN rod lens, which optical device makes full use of the characteristics of a single-mode optical fiber and which permits extremely easy adjustment; an optical wavelength demultiplexer/multiplexer which utilizes a GRIN rod lens and a pass filter; and a bidirectional communications system which utilizes a pair of the aforesaid optical wavelength demultiplexers/multiplexers. The optical device is constructed by a GRIN rod lens, a reflecting surface which is disposed on one end surface of the GRIN rod lens, and a ferrule which supports the distal ends of a first optical fiber and a second optical fiber symmetrically with respect to a central axis thereof and which is connected to the other end surface of the GRIN rod lens with the central axis thereof aligned with the optical axis of the GRIN rod lens. The core diameter of the second optical fiber is made sufficiently larger than the core diameter of the first optical fiber. The first optical fiber is a single-mode optical fiber, while the second optical fiber is a multi-mode optical fiber.
REFERENCES:
patent: 3853384 (1974-12-01), Pinnow et al.
patent: 4946239 (1990-08-01), Garmon
patent: 5159481 (1992-10-01), Maeda
patent: 5420688 (1995-05-01), Farah
Takahashi Mitsuo
Wu Yuying
Seiko Giken Co., Ltd.
Ullah Akm E.
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