Optical device with slab waveguide and channel waveguides on substrate

(19)

(11)

EP 1 978 385 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A2)

(48)	Corrigendum issued on:
	09.06.2010 Bulletin 2010/23

(43)	Date of publication:
	08.10.2008 Bulletin 2008/41

(21)	Application number: 08006891.9

(22)	Date of filing: 19.08.2003

(51)

International Patent Classification (IPC):

G02B 6/293^(2006.01)

(84)	Designated Contracting States:
	DE FR GB

(30)

Priority:

04.02.2003 JP 2003026614

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	03018619.1 / 1445631

(71)	Applicant: FUJITSU LIMITED
	Kawasaki-shi, Kanagawa 211-8588 (JP)

(72)	Inventors:
	Tabuchi, Haruhiko Kawasaki-shi Kanagawa 211-8588 (JP) Naruse, Terukaza Kawasaki-shi Kanagawa 211-8588 (JP) Terada, Koji Kawasaki-shi Kanagawa 211-8588 (JP) Shibata, Kohei Kawasaki-shi Kanagawa 211-8588 (JP)

(74)	Representative: HOFFMANN EITLE
	Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)


	Remarks:
	This application was filed on 04-04-2008 as a divisional application to the application mentioned under INID code 62.

(54)	Optical device with slab waveguide and channel waveguides on substrate

(57) An optical device used, for example, in an add/drop multiplexer, a dynamic gain equalizer or a optical power monitor. The optical device includes (a) a substrate; (b)a a first slab waveguide formed on the substrate; (c) channel waveguides of differing lengths formed on the substrate, light output from the first slab waveguide being input to the channel waveguides; and (d) a second slab waveguide formed on the substrate, light output from the channel waveguides being input to the second slab waveguide. An end face of the second slab waveguide shares a face with an end face of the substrate. The optical device has low loss characteristics.