Title:
OPTICAL TRANSMITTER AND OPTICAL MODULATION METHOD
Document Type and Number:
Japanese Patent JP3900874
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the nonlinear resistance of optical signal of an optical communication system.
SOLUTION: Related to an optical transmitter, CW light emitted from a light source 1 is phase modulated by an electric clock signal with a frequency which is a half of the bit rate frequency at an optical phase modulator 24. The phase-modulated light is so limited in pass band by an optical filter 25 so as to extract only a carrier wave and both of first sideband waves. The optical signal, after having passed the optical filter 25, is amplified by a first optical amplifier 2, and then data modulated by an optical intensity modulator 21. The data-modulated optical signal is amplified by a second optical amplifier 3, and then transmitted to a transmission path.
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Inventors:
Rika Ohira
Application Number:
JP2001275853A
Publication Date:
April 04, 2007
Filing Date:
September 12, 2001
Export Citation:
Assignee:
NEC
International Classes:
G02F1/01; H04B10/2507; H04B10/40; H04B10/50; H04B10/556; H04B10/60; (IPC1-7): H04B10/04; G02F1/01; H04B10/00; H04B10/06; H04B10/14; H04B10/26; H04B10/28
Other References:
K.Yonenaga 他,320Gbit/s WDM field experiment using 40Gbit/s ETDM channels over 176km dispersion-shifted fibre with,ELECTRONICS LETTERS,米国,IEEE,2000年 1月20日,Vol.36, No.2,p.153-155
Y.Miyamoto 他,320Gbit/s(8×40Gbit/s) WDM transmission over 367km with 120km repeater spaceing using carrier-suppre,ELECTRONICS LETTERS,米国,IEEE,1999年11月11日,Vol.35, No.23,p.2041-2042
Yonenaga et.al,320Gbit/s WDM field experiment using 40Gbit/s ETDM channels over 176km dispersion-shifted fibre with,Electronics Letters,米国,IEEE,2000年 1月20日,Vol.36, Issue.2,pages 153-155
Hirano et.al,40Gbit/s L-band transmission experiment using SPM-tolerant carrier-suppressed RZ format,Electronics Letters,米国,IEEE,1999年12月 9日,Vol.35, Issue.25,pages 2213-2215
関谷かや人 他,CS-RZ変調方式を用いた1.6Tb/s(40Gb/s×40波WDM)SMF480km伝送実験,2000年電子情報通信学会講演論文集,日本,電子情報通信学会,2000年 9月 7日,ソサイエティ大会,第298頁
Y.Miyamoto 他,320Gbit/s(8×40Gbit/s) WDM transmission over 367km with 120km repeater spaceing using carrier-suppre,ELECTRONICS LETTERS,米国,IEEE,1999年11月11日,Vol.35, No.23,p.2041-2042
Yonenaga et.al,320Gbit/s WDM field experiment using 40Gbit/s ETDM channels over 176km dispersion-shifted fibre with,Electronics Letters,米国,IEEE,2000年 1月20日,Vol.36, Issue.2,pages 153-155
Hirano et.al,40Gbit/s L-band transmission experiment using SPM-tolerant carrier-suppressed RZ format,Electronics Letters,米国,IEEE,1999年12月 9日,Vol.35, Issue.25,pages 2213-2215
関谷かや人 他,CS-RZ変調方式を用いた1.6Tb/s(40Gb/s×40波WDM)SMF480km伝送実験,2000年電子情報通信学会講演論文集,日本,電子情報通信学会,2000年 9月 7日,ソサイエティ大会,第298頁
Attorney, Agent or Firm:
Masahiko Desk
Masashi Kudo
Yasuhisa Tanizawa
Masashi Kudo
Yasuhisa Tanizawa