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:
Feb. 15, 2005
Filed:
Oct. 03, 2002
Masahiro Oikawa, Osaka, JP;
Ken Yamashita, Osaka, JP;
Chandrasekhar Roychoudhuri, Storrs, CT (US);
Vladimir V. Serikov, Bonita, CA (US);
Masahiro Oikawa, Osaka, JP;
Ken Yamashita, Osaka, JP;
Chandrasekhar Roychoudhuri, Storrs, CT (US);
Vladimir V. Serikov, Bonita, CA (US);
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
An optical communication system is designed to suppress the generation of cross talk even in the case of small wavelength spacing and high bit-rate modulation. An Nth order harmonic generating device where N is an integer of 2 or larger is positioned before a demultiplexer to upconver the frequency or down convert the wavetlength of the light wave by N times. The frequency spacing between the carriers is increased and allows easier separation of the optical signal and permits denser WDM channels and/or higher data rate per channel. In addition, Si or GaAs based photodiodes may be used instead of InP based photodiodes since the 1550 nm bands are converted to 780 nm bands.