The Furukawa Electric Co., Ltd.

Naoki Hashizume

Takeshi Nakajima

Kanji Tanaka

Hiroyuki Koshi

The present invention relates to an optical wavelength multiplexing and dividing device of an array waveguide type diffraction lattice, which is capable of separating and picking up wavelength-multiplexed signals of various wavelengths, which are used in optical transmissions. An input side slab waveguide ( ), a plurality of juxtaposed array waveguides ( ), an output side slab waveguide ( ) and a plurality of optical output waveguides ( ) are connected, in order, to the outgoing sides of a plurality of optical input waveguides ( ), thereby forming a waveguide pattern. The array waveguides ( ) are formed so as to have lengths different from each other to cause the phases of individual lights to be deviated after propagating through the respective array type waveguides ( ), wherein different lights as per wavelength are condensed at the incident ends ( ) of optical output waveguides by passing through the output side slab waveguides ( ) and are outputted through the optical output waveguides ( ). The incident ends ( ) of the optical output waveguides ( ) are provided at a light condensing predicted position of lights of the respective wavelengths where the lights are predicted to be condensed through the output side slab waveguide ( ), and the incident ends ( ) of the optical output waveguides ( ) are provided at a light condensing prediction corrected position where the light condensing position is shifted with respect to the light condensing predicted position.

Optical wavelength multiplexing and dividing device

An optical multiplexer/demultiplexer having a plurality of first waveguides a first slab waveguide an arrayed waveguide grating having a plurality of waveguides, a second slab waveguide and a plurality of second waveguides the individual waveguides being connected in the above order. The ratio of a distance between the plurality of first waveguides at a connecting portion with the first slab waveguide to a distance between the plurality of second waveguides at a connecting portion with the second slab waveguide differs from a ratio of a focal length of the first slab waveguide to a focal length of the second slab waveguide

Optical multiplexer/demultiplexer

An arrayed waveguide grating type optical multiplexer/demultiplexer includes input waveguides, an input-side slab waveguide, an arrayed waveguide diffraction grating, an output-side slab waveguide, and output waveguides. A junction between each input waveguide and the input-side slab waveguide is tapered such that the end portion of the input waveguide gradually widens in the width direction of the path toward the input-side slab waveguide, and includes two separate small-width waveguide portions arranged separately from the end portion of the input waveguide and extending in a line with taper of the tapered end portion, and a single large-width waveguide portion arranged separately from the small-width waveguide portions.

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Tokyo, Japan

Naoki Hashizume