US 7,627,207 B2 · Dispersion compensating method and dispersion compensating apparatus

Abstract

A dispersion compensating method for carrying out automatic level control with the use of target output power and an ASE correction value corresponding to the number of wavelengths to multiplex and making output power of a wavelength multiplexed signal constant, comprising the steps of: switching into automatic gain control in which the output power of the wavelength multiplexed signal is made constant, to carry out increase/decrease of the wavelengths to multiplex; varying a dispersion compensating amount based on the increase/decrease of the wavelengths by the automatic gain control; calculating an ASE variation amount due to the change in the dispersion compensating amount; and reflecting the ASE variation amount on the ASE correction value and switching into the automatic level control.

Claims16

Dependent claims

A method comprising:

variably compensating for dispersion in a wavelength division multiplexed (WDM) signal by a dispersion compensation amount;
optically amplifying the WDM signal, to thereby provide a WDM signal having been optically amplified and variably dispersion compensated;
and
controlling said amplifying in accordance with a power variation in the provided WDM signal due to variation in the dispersion compensation amount.

1 more element

An apparatus comprising:

a first optical amplifier optically amplifying a wavelength division multiplexed (WDM) signal;
a variable dispersion compensator variably compensating for dispersion in the WDM signal amplified by the first optical amplifier;
a second optical amplifier optically amplifying the WDM signal after being variably compensated for dispersion by the variable dispersion compensator;
and
a controller controlling the amplification of the first optical amplifier and the amplification of the second optical amplifier in accordance with a power variation in the WDM signal after being amplified by the second optical amplifier due to variation in the dispersion compensation amount.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/689,946Filed 22 Mar 2007 · division

Priority

20 Feb 2004

Published

US 2007/0177878 A12 Aug 2007

Granted

1 Dec 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04B 10/2935
Considering the whole optical path: with a cascade of amplifiers
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
H04J 14/02212
Power control, e.g. to keep the total optical power constant: by addition of a dummy signal

Family

PCT/JP2004/001980Parent of this continuation · filed 20 Feb 2004

Application11/437,803Parent of this division · filed 22 May 2006

US 2007/0177878 A1Pre-grant publication · published 2 Aug 2007

Application11/437,803Parent of this continuation

US 2006/0210220 A1Published application

US 7,627,207 B2This patent

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

Dispersion compensating method and dispersion compensating apparatus

Life of this patent

Dispersion compensating method and dispersion compensating apparatus

Life of this patent

Abstract

Claims16