US 5,675,429 AGranted

Optical communication transmission system

AssigneeNEC Corporation

InventorsNaoya Henmi, Shogo Nakaya, Tomoki Saito

Life of this patent

Estimating the term…

Loading patent…

Abstract

An optical communication transmission system including an optical amplifier lumped repeater system of the present invention includes, for the purpose of preventing degradation of the transmission characteristic arising from wavelength dispersion of optical fibers due to raised power of the optical signal, transmission optical fibers provided for all or most of the repeating sections and having wavelength dispersion values set to different values from zero, and optical fibers provided for the individual sections to compensate for the sum of wavelength dispersion of the sections so as to reduce the total wavelength dispersion to zero. The optical fiber for compensation for each section may be replaced by a substitutive compensation element. Alternatively, very small wavelength dispersion which remains due to failure in compensating to zero dispersion may be compensated for using a dispersion equalizer of an electric system in the reception section.

Claims4

Dependent claims

A long-haul optical amplifier lumped repeater communication system comprising:

an optical transmitter generating a light signal;
a first optical transmission link connected to said optical transmitter and having a zero dispersion wavelength of a value different from the transmission wavelength of the optical transmitter;
a plurality of optical amplifier-repeaters, one of the optical amplifier-repeaters being connected to the first optical link;
a plurality of intermediate optical transmission links interconnecting the plurality of amplifier-repeaters, each of said plurality of optical transmission links having a zero dispersion wavelength of a value different from the transmission wavelength of the optical transmitter;
an optical receiver;
a terminating optical transmission link connected between one of the optical amplifier-repeaters and the optical receiver and having a zero dispersion wavelength of a value different from the transmission wavelength of the optical transmitter;
a plurality of dispersion compensating means, each connected to respective one of said first, intermediate and terminating optical links so that the total dispersion of the system is approximately equal to zero.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/452,728Filed 30 May 1995 · continuation
Priority: JP 4-16233822 Jun 1992
Granted: 7 Oct 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G02B 6/29377
Coupling light guides for controlling wavelength dispersion, e.g. by concatenation of two light guides having different dispersion properties:…
H04B 10/25133
Due to chromatic dispersion: including a lumped electrical or optical dispersion compensator
H04B 10/25253
Using dispersion-compensating fibres: with dispersion management, i.e. using a combination of different kind of fibres in the transmission system
H04B 10/2935
Considering the whole optical path: with a cascade of amplifiers