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AssigneeFujitsu Limited
InventorsGeorge Ishikawa, Hideyuki Miyata, Hiroshi Onaka, Motoyoshi Sekiya, Kazue Otsuka
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The invention provides an optical wavelength multiplex transmission method wherein a band in the proximity of a zero dispersion wavelength of an optical fiber is used and optical signals are disposed at efficient channel spacings taking an influence of the band, the wavelength dispersion and the four wave mixing into consideration to realize an optical communication system of an increased capacity which is not influenced by crosstalk by FWM. When optical signals of a plurality of channels having different wavelengths are to be multiplexed and transmitted using an optical fiber, a four wave mixing suppressing guard band of a predetermined bandwidth including the zero-dispersion wavelength .lambda..sub.0 of the optical fiber is set, and signal light waves of the plurality of channels to be multiplexed are arranged on one of the shorter wavelength side and the longer wavelength side outside the guard band.
An optical dispersion compensation method for compensating for a dispersion amount of an optical transmission system which includes a transmitter, a repeater and a receiver and transmits, from the transmitter to the receiver by way of the repeater using an optical fiber, signal light which is arranged, taking a zero-dispersion wavelength .lambda..sub.0 of the optical fiber and a zero-dispersion wavelength deviation range .+-..DELTA..lambda..sub.0 of the optical fiber in its longitudinal direction into consideration, within a transmissible band which is defined by an allowable dispersion value determined from a synergetic effect of self phase modulation and group velocity dispersion in the optical fiber and is set on a shorter wavelength side than a shorter wavelength end .lambda..sub.0 -.DELTA..lambda..sub.0 or on a longer wavelength side than a longer wavelength end .lambda..sub.0 +.DELTA..lambda. of the zero-dispersion wavelength deviation range of the optical fiber, said method comprising the steps of:
An optical dispersion compensation method for compensating for a dispersion amount of an optical transmission system which includes a transmitter, a repeater and a receiver and transmits signal light from said transmitter to said receiver by way of said repeater, comprising the steps of:
Dependencies are inferred from the claim text.