Telefonaktiebolaget Lm Ericsson (publ)

Erin Seder

Fabio Cavaliere

Francesco Testa

A method () is disclosed for filtering an optical signal to generate at least one electrical output. The method comprises receiving an optical signal () and directing at least a part of the optical signal through an n&#xd7;m array of wavelength selective elements (), the n&#xd7;m array comprising n parallel groups, each group comprising m coupled wavelength selective elements. The method further comprises photodetecting an output from each of the n groups of coupled wavelength selective elements (), and electrically selecting at least one of the photodetected outputs (). Also disclosed are an optical filtering module () a controller () for an optical filtering module and a computer program.

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Pisa, Italy

Erin Seder