METHOD AND APPARATUS FOR CALCULATING NONLINEAR TRANSMISSION IMPAIRMENT OF OPTICAL FIBER LINK

摘要

The present invention relates to the field of network communications and discloses a method for calculating a nonlinear transmission impairment, including: determining that no pump channel exists in an optical fiber link, obtaining a factor of intra-band nonlinear noise that does not pass through an optical filter, and obtaining integral power in signal light bandwidth of a span; correcting the factor of intra-band nonlinear noise that does not pass through an optical filter, to obtain a factor of intra-band nonlinear noise of the span that passes through an optical filter; calculating nonlinear noise of the span; and obtaining total nonlinear noise of the optical fiber link according to the nonlinear noise of the span, and obtaining a nonlinear transmission impairment of the optical fiber link. Embodiments of the present invention further provide an apparatus for calculating a nonlinear transmission impairment of an optical fiber link.

主权项

1. A method for calculating a nonlinear transmission impairment of an optical fiber link, comprising:
determining that no pump channel exists in an optical fiber link, obtaining a factor of intra-band nonlinear noise that is in the optical fiber link and does not pass through an optical filter, and obtaining integral power in signal light bandwidth of a span in the optical fiber link; correcting the factor of intra-band nonlinear noise that does not pass through an optical filter, to obtain a factor of intra-band nonlinear noise of the span in the optical fiber link that passes through an optical filter; calculating nonlinear noise of the span in the optical fiber link by using the following formula:
PNL=αintra(n)·(PS)3; wherein, PNL represents the nonlinear noise of the span; αintra(n) represents the factor of intra-band nonlinear noise of the span that passes through an optical filter; n represents the number of optical filters through which a signal light of the span passes; and PS represents the integral power in the signal light bandwidth of the span; and obtaining total nonlinear noise of the optical fiber link according to the nonlinear noise of the span in the optical fiber link, and obtaining a nonlinear transmission impairment of the optical fiber link.