METHODS AND SYSTEMS FOR REDUCING POLARIZATION DEPENDENT LOSS

摘要

An photonics integrated circuit (11) for processing radiation. The photonics integrated circuit (11) comprises a first two-dimensional grating coupler (14) for coupling in radiation, a second two-dimensional grating coupler (15) for coupling out radiation and a waveguide structure comprising two distinct waveguide arms (16, 17) for splitting radiation received from the first grating coupler (14) and recombining radiation in the second grating coupler (15). A phase shifting means (40) furthermore is provided for inducing an additional phase shift in at least one of the two distinct waveguide arms thereby inducing a relative phase shift of p between the two distinct waveguide arms (16, 17) so as to provide a TE/TM polarization switch for radiation between the first grating coupler (14) and the second grating coupler (15).