Patent ID: 9397749
Filing Date: 2016-07-19
CPC Classification: H04B,H04J

Claim Text:
1. A method for performing an automatic power adjustment of a signal power level of one optical channel transmitted by an optical transceiver, comprising: automatically adjusting, in response to a determined span loss of at least one optical span, the signal power level of the one optical channel transmitted by the optical transceiver via the at least one optical span to a far-end device to achieve a predetermined desired receive signal power level of the optical channel at the far-end-device; wherein said automatic adjusting is performed by said optical transceiver in real time to compensate for changes of the transmission capability of said optical span; wherein the signal power level of the one optical channel is adjusted automatically such that the signal power level of the one optical channel is balanced with respect to signal power levels of other optical channels transmitted over the same optical span at different wavelengths, making the signal power levels have a substantially flat optical power spectrum; wherein each optical channel is transmitted via a different wavelength; wherein the span loss is determined by comparing a measured signal power level of an optical channel received by the optical transceiver via a fibre of said optical span from said far-end-device with a predetermined desired receive signal power level of the optical channel transmitted by said far-end-device; wherein the far-end-device is an optical transceiver; and wherein at least one communication channel is established via said optical span between said optical transceiver and said far-end-device.