US 7,481,587 B2
	Optical element, mold for the optical element, method for manufacturing the optical element and bidirectional optical communication module
Hajime Kobayashi, Tokyo (Japan); Yayoi Eguro, Hachioji (Japan); Nobuyoshi Mori, Hachioji (Japan); Hiroyuki Hattori, Hachioji (Japan); Yoshiharu Masaki, Kodaira (Japan); Fumiaki Yoshida, Tama (Japan); Yuichi Atarashi, Hachioji (Japan); Kazuhiro Wada, Hachioji (Japan); and Kazuhiko Ishikawa, Kofu (Japan)
Assigned to Konica Minolta Opto, Inc., Tokyo (Japan)
Filed on Mar. 22, 2007, as Appl. No. 11/723,871.
Claims priority of application No. 2006-084966 (JP), filed on Mar. 27, 2006.
Prior Publication US 2007/0237458 A1, Oct. 11, 2007
Int. Cl. G02B 6/36 (2006.01)

U.S. Cl. 385—89  [385/37; 370/464]

6 Claims

1. An optical element used in a bidirectional optical communication module used for bidirectional optical fiber communication by a wavelength multiplex system, comprising a diffraction grating of binary structure prepared by molding, wherein a taper is formed at a portion of the diffraction grating where light entering the diffraction grating is intercepted by a convex part of the binary structure of the diffraction grating.