Mitigation of optical signal to noise ratio degradation arising from polarization dependent loss

摘要

Methods and systems for mitigating degradation of an optical signal-to-noise ratio (OSNR) induced by polarization dependent loss (PDL) in an optical network include determining an increase in power (ΔP) corresponding to a PDL-induced decrease in OSNR for a given channel being transmitted over an optical signal transmission path. The increase in power (ΔP) may be adjusted for at least some of the network nodes in the optical signal transmission path. At certain network nodes, the increase in power (ΔP) may be realized with a combination of attenuation and gain.

主权项

1. A method for mitigating optical signal-to-noise ratio degradation in an optical network, comprising:
identifying an optical signal transmission path carrying an optical channel over the optical network, wherein the optical signal transmission path comprises N number of network nodes; determining an increase in optical power (ΔP) for the optical channel corresponding to a decrease in an optical signal-to-noise ratio (OSNR) for the optical channel, the decrease in the optical signal-to-noise ratio being a result of polarization dependent loss (PDL) along the optical signal transmission path; calculating a node power increase (ΔPnode) for each respective network node for the optical channel based on the increase in optical power (ΔP); and sending instructions to at least some of the N number of network nodes to adjust an in-line power level for the optical channel by the node power increase (ΔPnode), respectively, wherein the optical channel has a dual polarization.