Optical communications – Receiver – Including optical element
Reexamination Certificate
2007-01-10
2010-12-28
Curs, Nathan M (Department: 2613)
Optical communications
Receiver
Including optical element
C398S214000, C359S288000, C385S014000
Reexamination Certificate
active
07860408
ABSTRACT:
An interferometer for demodulating a differential M-phase shift keying signal includes a PLC type interferometer main body, a heating portion that heats the PLC type interferometer main body, and an intermediate member having a higher stiffness than that of the PLC type interferometer main body, for bonding the PLC type interferometer main body and the heating portion with each other while being sandwiched therebetween. A linear expansion coefficient difference between the PLC type interferometer main body and the intermediate member is equal to or smaller than 4.5×10−6/° C., and a thermal conductivity difference between the PLC type interferometer main body and the intermediate member is equal to or larger than 10 W/mK. A phase of an optical signal flowing through the interferometer is adjusted by using the heating portion and a second heating portion.
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Japanese Patent Office Notice of Reason for Rejection mailed May 18, 2010, in corresponding Japanese Patent Application No. 2006-019607.
Arai Hideaki
Hoshida Takeshi
Ishikawa George
Isomura Akihiko
Matsuura Hiroyuki
Curs Nathan M
Fujitsu Limited
Hitachi Cable Ltd.
Staas & Halsey , LLP
Yokogawa Electric Corporation
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