Optical signal processing apparatus, optical signal processing method and computer program

An optical signal processing method for separating and detecting an optical signal transmitted in a mode division multiplexing optical communication method by signal processing based on a multi-input multi-output (MIMO)-type linear filter, wherein the optical signal processing method comprises:

• estimating weighting factors of the MIMO-type linear filter by sequential calculation based on an affine projection method, and
• in the sequential calculation, an output signal by the sequential calculation is expressed by
• a correlation vector indicating a correlation between the plurality of input signals,
• a smoothing prefilter vector indicating, of smoothing prefilter factors indicating a relationship between the weighting factors at current time and input signals from a first time being a past predetermined time to the current time, smoothing prefilter factors corresponding to each time from the first time to a second time that corresponds to an affine projection order in the affine projection method, and
• input signals from the first time to the second time.

A non-transitory computer-readable storage medium that stores a computer program when executed by a computer causing the computer functioning as an optical signal processing apparatus for separating and detecting an optical signal transmitted in a mode division multiplexing optical communication method by signal processing based on a multi-input multi-output (MIMO)-type linear filter to execute,

• estimating weighting factors of the MIMO-type linear filter by sequential calculation based on an affine projection method, and
• in the sequential calculation, an output signal by the sequential calculation is expressed by
• a correlation vector indicating a correlation between the plurality of input signals,
• a smoothing prefilter vector indicating, of smoothing prefilter factors indicating a relationship between the weighting factors at current time and input signals from a first time being a past predetermined time to the current time, smoothing prefilter factors corresponding to each time from the first time to a second time that corresponds to an affine projection order in the affine projection method, and
• input signals from the first time to the second time.