Method of adjusting power for a wavelength-division multiplexed optical transmission system
AssigneeCorvis Algety SA
InventorThierry Georges
Life of this patent
Estimating the term…
Abstract
Adjusting power for a WDM optical transmission system comprising emitter means, an optical transmission line, and receiver means, the method being characterized in that for each wavelength channel, the power emitted for said channel by the emitter means is adjusted as a function of the optical powers received for said channel at a plurality of points distributed along the transmission line.
Claims9
A method of adjusting power for a WDM optical transmission system comprising emitter means, an optical transmission line, and receiver means, comprising adjusting for each wavelength channel, the power emitted for said channel by the emitter means as a function of the optical powers received for said channel at the inlet to the first amplifier, wherein for each channel a reference power is continuously determined as a function of the optical powers received for said channel at the inlet to the first amplifier, said reference power being the power that ought to be received for said channel at the inlet to the first amplifier, and the emitter means are controlled so as to servo-control the power at said inlet on said reference power, wherein for each channel i, a parameter fi is determined which is a function of the powers received at the inlet to the first amplifier, and in that the reference power is modified by replacing its preceding value with a reference value that is a function of said preceding value and also of the parameter fi, wherein the parameter fi is such that:
- f
- i
- =
- ∑
- j
- =
- l
- ,
- m
-
-
- P
- ij
- -
- 1
- where Pij represents the power at the jth point of the transmission line for channel i and where m is the number of points of said line.
A method of adjusting power for a WDM optical transmission system comprising emitter means, an optical transmission line, and receiver means, comprising adjusting for each wavelength channel, the power emitted for said channel by the emitter means as a function of the optical powers received for said channel at the inlet to the first amplifier, wherein for each channel a reference power is continuously determined as a function of the optical powers received for said channel at the inlet to the first amplifier, said reference power being the power that ought to be received for said channel at the inlet to the first amplifier, and the emitter means are controlled so as to servo-control the power at said inlet on said reference power, wherein for each channel i, a parameter fi is determined which is a function of the powers received at the inlet to the first amplifier, and in that the reference power is modified by replacing its preceding value with a reference value that is a function of said preceding value and also of the parameter fi, characterized in that the parameter fi is such that:
- fi=1/(Pi1·Pim)1/2
- wherein,
- Pi1 is the power of the ith channel at the 1st amplifier and
- Pim is the power of the ith channel at the mth amplifier.
A method of adjusting power for a WDM optical transmission system comprising emitter means, an optical transmission line, and receiver means, comprising adjusting for each wavelength channel, the power emitted for said channel by the emitter means as a function of the optical powers received for said channel at the inlet to the first amplifier, wherein for each channel a reference power is continuously determined as a function of the optical powers received for said channel at the inlet to the first amplifier, said reference power being the power that ought to be received for said channel at the inlet to the first amplifier, and the emitter means are controlled so as to servo-control the power at said inlet on said reference power, wherein for each channel i, a parameter fi is determined which is a function of the powers received at the inlet to the first amplifier, and in that the reference power is modified by replacing its preceding value with a reference value that is a function of said preceding value and also of the parameter fi, wherein the new reference power is the product of the preceding reference value and a function of fi, wherein the function is a product η·fi, η being a weighting factor selected so that the total power received by the first amplifier is constant.
Dependencies are inferred from the claim text.