US 6,486,993 B1Granted

Wavelength dispersion compensation apparatus in wavelength multiplex transmission system

AssigneeNEC Corporation

InventorJun Kuroshima

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Abstract

A wavelength dispersion compensation apparatus is provided which requires only a small number of dispersion compensation fibers for compensating for the wavelength dispersion of a wavelength multiplex signal caused in the transmission optical fibers. The dispersion compensation fibers are used for transmitting individual light signals which composes a wavelength multiplex signal, in order to give a wavelength dispersion in the opposite direction, the absolute value of which is the same as the dispersion which will be caused in the light signals during transmitting in the transmission optical fibers. At the output ends of the dispersion compensation fibers, a pair of two light signals with specific wavelengths is extracted by the light branching means composed of fiber gratings FG11 and FG12 and so on. The light signals extracted by the light branching means are multiplexed by the arrayed waveguide AWG2 and supplied to the transmission optical fibers after amplified by the light amplifiers AMP1 to AMP8.

Claims5

Dependent claims

A wavelength dispersion compensation apparatus for use in a wavelength multiplex transmission system, the apparatus compensating, in advance, for a wavelength dispersion induced in respective wavelengths of a wavelength multiplexed signal during transmission through a transmission optical fiber, the wavelength dispersion compensation apparatus comprising:

a plurality of dispersion compensation fibers coupled in series, said plurality of dispersion compensation fibers applying respective compensating wavelength dispersions to said respective wavelengths of said wavelength multiplexed signal in order to compensate for the wavelength dispersion that will occur during transmission in the transmission optical fiber;
a plurality of light branching devices, at least one of said light branching devices being disposed at an output end of each of said dispersion compensation fibers, said light branching devices separating and extracting individual light signals with specific wavelengths from said wavelength multiplexed signal;
and
a light multiplexer coupled to said plurality of light branching devices, said light multiplexer generating a compensated wavelength multiplexed signal by multiplexing said individual light signals, said light multiplexer further supplying said compensated wavelength multiplexed signal to the transmission optical fiber.

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Dependencies are inferred from the claim text.