| US 7,421,209 B2 | ||
| Optical wavelength multiplexing FSK modulation method | ||
| Tetsuya Kawanishi, Koganei (Japan); and Masayuki Izutsu, Koganei (Japan) | ||
| Assigned to National Institute of Information and Communications Technology, Incorporated Administrative Agency, Tokyo (Japan) | ||
| Filed on Feb. 14, 2005, as Appl. No. 11/56,395. | ||
| Claims priority of application No. 2004-039059 (JP), filed on Feb. 16, 2004. | ||
| Prior Publication US 2005/0180761 A1, Aug. 18, 2005 | ||
| Int. Cl. H04B 10/04 (2006.01) | ||
| U.S. Cl. 398—183 [398/182; 398/184; 398/185; 398/186; 398/187; 398/188; 398/192; 398/193; 398/194; 398/200; 398/201; 398/202; 398/79; 398/81; 398/147; 398/158; 398/159; 398/91; 398/141; 398/140] | 37 Claims |
| 1. An optical wavelength multiplexing frequency shift keying modulation system comprising:
optical wavelength multiplexing signal acquisition means for outputting an optical wavelength multiplexing signal;
optical frequency shift keying modulation means for acquiring an optical frequency shift keying signal including an upper
side band signal and a lower side band signal by performing frequency modulation to the optical wavelength multiplexing signal
output from the optical wavelength multiplexing signal acquisition means; and
optical frequency shift keying signal separation means for separating the optical frequency shift keying signal output from
the optical frequency shift keying modulation means into an upper side band signal and a lower side band signal; and wherein
an optical wavelength multiplexing signal output from the optical wavelength multiplexing signal acquisition means is subjected
to frequency modulation by the optical frequency shift keying modulation means to obtain an optical frequency shift keying
signal, and the optical frequency shift keying signal separation means separates the optical frequency shift keying signal
into an upper side band signal and a lower side band signal to obtain an optical frequency shift keying modulation signal.
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