  A linear regression algorithm is applied to a digital-supermode distributed
Bragg reflector laser to optimise wavelength switching times. The algorithm
uses the output of a digital coherent receiver as feedback to update the
pre-emphasis weights applied to the laser section currents. This permits
in-situ calculation without manual weight adjustments. The application of this
optimiser to a representative subsection of channels indicates this
commercially available laser can rapidly reconfigure over 6.05 THz, supporting
122 channels, in less than 10 ns.
