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:
Jun. 09, 1998
Filed:
May. 08, 1996
The Furukawa Electric Co. Ltd., Tokyo, JP;
Abstract
The present invention proposes an optical wavelength division multiplexer device which has low through loss and low reflection loss, and also has high isolation. A filter member is made up from a filter base board upon which is formed a wavelength division filter 5, and is disposed so as to intersect an input and output optical waveguide 3 of rectilinear form part-way along it at an intersection angle .alpha.. When light which includes light of two different wavelengths .lambda..sub.1 and .lambda..sub.2 is incident through an incident light side of the input and output optical waveguide 3, the light of wavelength .lambda..sub.2 passes through the wavelength division filter 5 and is emitted through an emitted light side, while the light of wavelength .lambda..sub.1 is reflected by the wavelength division filter 5 in a direction separated from the input and output optical waveguide 3. A reflected light reception waveguide 1 is formed as rectilinear and is arranged in this reflection direction so as to receive the reflected light, with a gap being left between this reflected light reception waveguide 1 and the input and output optical waveguide 3, and the reflected light of wavelength .lambda..sub.1 is received into a reflected light reception end thereof and is emitted from a received light after end portion thereof. By providing this gap between the input and output optical waveguide 3 and the reflected light reception waveguide 1, increase of loss due to mutual action between the incident light and the reflected light is restrained.
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