Patent ID: 7623790
Filing Date: 2009-11-24
Classification: H04B

Abstract:
1. A method for identifying characteristics of an optical signal, comprising: receiving a data sample representing a first optical signal; said receiving step comprising the steps of: comparing the data sample to a set of pre-stored model curves, each model curve representing at least one signal characteristic using a curve-fit analysis; determining, for each comparison, an error value representing a quantity of difference between the data sample and a particular one of the pre-stored model curves; selecting one of the pre-stored model curves with an error value having a least quantity of difference; attributing to the first optical signal the at least one signal characteristic of the selected one of the pre-stored model curves; and determining center frequency detuning from an ITU grid for the optical signal by performing a least-squares estimate for each characteristic functional form several times with small discrete frequency shifts to the functional form applied each time.