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:
Jun. 02, 2009
Filed:
Apr. 21, 2008
Kazushige Yonenaga, Kanagawa, JP;
Yutaka Miyamoto, Kanagawa, JP;
Akihiko Matsuura, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal () for accepting an electrical binary signal, an amplifier () for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter () such as a Mach Zehnder light modulator, a bandwidth restriction means () which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means () such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter () between an output of the amplifier () and the Mach Zehnder light modulator (), the amplifier () may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter () is applied to the Mach Zehnder light modulator () with excellent waveform. The invention is useful for long distance, large capacity and low cost optical transmission system.