公开(公告)号：JP2002131568A

公开(公告)日：2002-05-09

申请号：JP2001262680

申请日：2001-08-31

Applicant: AGERE SYSTEMS INC

Inventor： CHANDRASEKHAR SETHUMADHAVAN ,  DENTAI ANDREW GOMPERZ ,  LEVINE BARRY F ,  THOMAS GORDON BECK MASON ,  OLA SOJORANDO

IPC: H01L31/10 ,  G02B6/12 ,  G02B6/122 ,  G02B6/30 ,  G02B6/42 ,  H01L31/0232

Abstract: PROBLEM TO BE SOLVED: To provide a high speed photodetector having both excellent optical coupling efficiency and high internal efficiency. SOLUTION: This optical device is provided with a first waveguide 204 having a capability for supporting an optical mode. The optical mode has a first size in the inside of the first waveguide 204. The first waveguide 204 is optically coupled to a second waveguide 207. The second waveguide 207 has a capability for supporting the optical mode and the optical mode has a second size in the inside of the second waveguide 207. The photodetector is optically coupled to the second waveguide 207. As a strong point, the first mode size is larger than the second mode size. The first waveguide 204 is capable of being efficiently coupled to an optical source, for example, an optical fiber. The second waveguide 207 is capable of being efficiently coupled to the detector.