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.:
Date of Patent:
Oct. 25, 2011
Filed:
Dec. 19, 2006
Takumi Nomura, Tokyo, JP;
Hiromi Ueda, Tokyo, JP;
Kunitetsu Makino, Kanagawa, JP;
Hiroaki Kurokawa, Tokyo, JP;
Toshinori Tsuboi, Tokyo, JP;
Hiroyuki Kasai, Tokyo, JP;
Hirokazu Kobayashi, Kanagawa, JP;
Takumi Nomura, Tokyo, JP;
Hiromi Ueda, Tokyo, JP;
Kunitetsu Makino, Kanagawa, JP;
Hiroaki Kurokawa, Tokyo, JP;
Toshinori Tsuboi, Tokyo, JP;
Hiroyuki Kasai, Tokyo, JP;
Hirokazu Kobayashi, Kanagawa, JP;
NEC Communications Systems, Ltd., Tokyo, JP;
Abstract
In an optical access network using an optical switching device, a 2×1 optical splitter in the uplink and downlink directions is eliminated to extend the transmission distance between the OLT and the ONU. An optical switching device includes a downlink optical switch element for switching a downlink optical signal sent by an OLT, an uplink optical switch element for switching an uplink optical signal sent by a plurality of ONU, an O/E for converting a downlink optical signal to a first electrical signal, an E/O for converting the first electrical signal to a downlink optical signal and inputting the downlink optical signal to the downlink optical element, an O/E for converting an uplink optical signal output from the uplink optical switch element to a second electrical signal, and an E/O for converting the second electrical signal to an uplink optical signal and sending the uplink optical signal to the OLT.