Demultiplexing and/or multiplexing optical circuit
AssigneeNippon Sheet Glass Co., Ltd.
InventorsMasafumi Seki, Yoshiyuki Hanada, Ryoichi Sugawara
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Abstract
In a demultiplexing and/or multiplexing optical circuit of the invention, a groove for arranging a filter in an optical waveguide is arranged to be perpendicular to a pair of parallel opposing sides of a substrate for constituting the optical circuit. A plurality of demultiplexer and/or multiplexer can be formed simultaneously, and a high machining precision can be obtained relatively easily.
Claims8
A demultiplexing and/or multiplexing optical circuit wherein an optical waveguide, including branching portions for dividing an incident optical path into transmitting and reflecting optical paths, is formed in a substrate, a groove for crossing said optical waveguide and said branching portions and a portion midway along one of said optical paths as needed is formed, and filters are fitted in said groove, and wherein said optical waveguide is embedded in said substrate, said groove is formed from one of a pair of opposing parallel sides of said substrate to the other thereof straight and perpendicularly thereto, and a filler having a refractive index greater than one, is filled in a portion of said groove where said groove crosses said optical waveguide and said filter is not fitted.
A demultiplexing and/or multiplexing optical circuit wherein an optical waveguide, including branching portions for dividing an incident optical path into transmitting and reflecting optical paths, is formed in a substrate, a groove for crossing said optical waveguide at said branching portions and a portion midway along one of said optical paths as needed is formed, and filters are fitted in said groove, and wherein said optical waveguide is embedded in said substrate, said groove is formed from one of a pair of opposing parallel sides of said substrate to the other thereof straight and perpendicularly thereto, a filler, having a refractive index greater than one, is filled in a portion of said groove where said groove crosses said optical waveguide and said filter is not fitted, and at least one of said filters has a 23-layer structure indicated by HLH (3HLHLHL3H).sup.3 HLH where H is a layer having a relatively high refractive index and a layer thickness corresponding to .lambda./4 and L is a layer having a relatively low refractive index and a layer thickness corresponding to .lambda./4.
Dependencies are inferred from the claim text.