One aspect of the invention relates to a waveguide assembly. The waveguide assembly comprises a waveguide (120) provided on a substrate (126), a waveguide housing (100) and an embedding layer (138) embedding at 5 least part of the waveguide housing (100). The waveguide housing (100) comprises a waveguide channel (102) for guiding the waveguide (120) from the substrate (126) through the embedding layer (138).