Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Patent
1995-08-31
1997-05-13
Hellner, Mark
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
359161, 359176, H01S 300, H04B 1002
Patent
active
056297955
ABSTRACT:
An optical amplifying-repeating transmission system is disclosed which is composed of an optical fiber for transmitting a lightwave signal with digital information added to return-to-zero lightwave pulses and a plurality of optical amplifying repeaters inserted in the optical fiber for transmission use. The mean value of wavelengths at which the wavelength dispersion of the optical fiber is zero is smaller than the wavelength of the lightwave signal which is transmitted over the system. The accumulated wavelength dispersion value of the optical fiber tends to increase with the distance of transmission, from a macroscopic viewpoint. The optical fiber for transmission is divided into a plurality of sections. In accordance with the accumulated wavelength dispersion value of the optical fiber in each section except at least the last one, a wavelength dispersion medium, which locally changes the wavelength dispersion in a manner to cancel the accumulated wavelength dispersion in the section at the wavelength of the lightwave signal, is inserted in the section to eliminate the accumulation of the timing jitter.
REFERENCES:
patent: 5140452 (1992-08-01), Yamamoto et al.
patent: 5140656 (1992-08-01), Hasegawa et al.
patent: 5355240 (1994-10-01), Prigent et al.
patent: 5365362 (1994-11-01), Gnauck et al.
patent: 5471333 (1995-11-01), Taga et al.
Akiba Shigeyuki
Edagawa Noboru
Morita Itsuro
Suzuki Masatoshi
Taga Hidenori
Hellner Mark
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
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