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. 24, 2006
Filed:
Jun. 05, 2002
Jun-ichi Kani, Yokohama, JP;
Katsuhiro Araya, Yokohama, JP;
Noboru Takachio, Yokosuka, JP;
Koji Akimoto, Yokosuka, JP;
Mitsuhiro Teshima, Yokosuka, JP;
Masamichi Fujiwara, Yokosuka, JP;
Hiroo Suzuki, Yokohama, JP;
Shingo Kawai, Yokosuka, JP;
Katsumi Iwatsuki, Yokohama, JP;
Jun-ichi Kani, Yokohama, JP;
Katsuhiro Araya, Yokohama, JP;
Noboru Takachio, Yokosuka, JP;
Koji Akimoto, Yokosuka, JP;
Mitsuhiro Teshima, Yokosuka, JP;
Masamichi Fujiwara, Yokosuka, JP;
Hiroo Suzuki, Yokohama, JP;
Shingo Kawai, Yokosuka, JP;
Katsumi Iwatsuki, Yokohama, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
Multi-wavelength light having a frequency band equal to or greater than the FSR of an AWG is demultiplexed into individual wavelength channels, and power level deviations between wavelength channels are suppressed. An optical demultiplexer includes a wavelength-group demultiplexer that demultiplexes multi-wavelength light into wavelength groups formed from wavelength channels, and channel demultiplexers that demultiplex each wavelength group into wavelength channels light. An optical multiplexer includes channel multiplexers that multiplex modulated signal light of each wavelength channel for each wavelength group, and a wavelength-group multiplexer that multiplexes, for each wavelength group, WDM signal light output from the channel multiplexers. The FSR of the wavelength-group multiplexer/demultiplexer is set to be equal to or greater than the frequency band of the multi-wavelength light. The channel multiplexer/demultiplexer is an AWG in which the FSR is approximately the full width at half maximum of the transmission characteristics of each port of the wavelength-group multiplexer/demultiplexer.