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.:

US 9851504 B1

Date of Patent:

Dec. 26, 2017

Filed:

Sep. 30, 2016

Planar optical waveguide device, dp-qpsk modulator, coherent receiver, and polarization diversity

Applicant:

Fujikura Ltd., Tokyo, JP;

Inventor:

Akira Oka, Sakura, JP;

Assignee:

FUJIKURA LTD., Koto-ku, Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Omar R Rojas

Int. Cl.

CPC ...

G02B 6/126 (2006.01); G02B 6/122 (2006.01); G02B 6/14 (2006.01); G02B 6/125 (2006.01); G02B 6/12 (2006.01);

U.S. Cl.

CPC ...

G02B 6/126 (2013.01); G02B 6/122 (2013.01); G02B 6/125 (2013.01); G02B 6/1228 (2013.01); G02B 6/14 (2013.01); G02B 2006/12097 (2013.01);

Abstract

A planar optical waveguide device includes: a substrate; a core that forms a first waveguide and a second waveguide that are arranged in parallel on the substrate; and a cladding that covers the core and has a refractive index smaller than that of the core. The core includes a first rib portion that forms the first waveguide, a second rib portion that forms the second waveguide, and a slab portion that is provided only on one side of the first rib portion and the second rib portion in a width direction to have a thickness smaller than the thicknesses of the first rib portion and the second rib portion and is shared between the first rib portion and the second rib portion.

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