US 7,116,913 B2Granted

Optical transmission system and dispersion compensator

AssigneeFujitsu Limited

InventorsAkira Miyauchi, Kazuo Yamane, Yumiko Kawasaki, Satoru Okano

Life of this patent

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Abstract

In an optical transmission system comprising a transmitter, a receiver, and a transmission line that connects the transmitter and the receiver, a dispersion compensator is disposed in the receiver. The transmitter comprises an E/O (electro-optical signal converter) and a post-amplifier. An optical signal that has been RZ-coded is supplied to the E/O. The transmitter pre-chirps the optical signal. The pre-chirp is performed by red-chirp of which the value of the chirping parameter α is positive. When the pre-chirp is performed, the non-linear effect of the optical signal on the transmission line can be canceled. In addition, with the RZ coded signal, the inter-symbol interference can be alleviated. Thus, the total dispersion amount of the dispersion compensator can be suppressed. In addition, the power of the optical output can be increased.

Claims3

Dependent claims

A dispersion compensator for use with an optical transmission system to compensate for dispersion of an optical signal propagated on a transmission line, comprising:

a plurality of dispersion compensation units releasably connected together, each having the substantially the same dispersion compensation amount wherein each dispersion compensation unit has first and second sides, the first side having input and output terminals thereon and the second side having bypass terminals thereon, each dispersion compensation unit having a switch mechanism such that if the bypass terminals of a first dispersion compensation unit are connected to the input and output terminals of a second dispersion compensation unit, an optical path between the input and output terminals of the first dispersion compensation unit is opened and optical paths are closed in the first dispersion compensation unit between the input and output terminals and the bypass terminals, respectively.

Dependencies are inferred from the claim text.

Facts

Application: 10/958,277Filed 6 Oct 2004 · division
Priority: JP 9-04440627 Feb 1997
Published: US 2005/0047792 A13 Mar 2005
Granted: 3 Oct 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04B 10/25137
Due to chromatic dispersion: using pulse shaping at the transmitter, e.g. pre-chirping or dispersion supported transmission [DST]
H04B 10/25133
Due to chromatic dispersion: including a lumped electrical or optical dispersion compensator
H04B 2210/252
Distortion or dispersion compensation: after the transmission line, i.e. post-compensation
H04B
Transmission

Family

Application08/922,677Parent of this continuation · filed 3 Sep 1997
Application09/749,774Parent of this division · filed 28 Dec 2000
US 2005/0047792 A1Pre-grant publication · published 3 Mar 2005
US 6,823,141 B2Parent of this division
Application09/749,774Parent of this continuation
US 2001/0015843 A1Published application
US 7,116,913 B2This patent

From the US filing history. Foreign family members aren’t listed.