INTEGRATED LIGHT ABSORBER

摘要

The integrated light absorber comprises a light chamber (2) integrated in an optical chip, the chamber (2) having upper (3A) and lower walls lying substantially parallel to the chip and peripheral walls (3B) extending therebetween and a light input port in a peripheral wall (3B) for receiving light to be absorbed, e.g. from a rib waveguide (1). At least some of the walls have light absorbing properties and the chamber (2) is shaped so that the majority of light which enters the chamber (2) through the light input port undergoes multiple reflections and so is absorbed by the walls of the chamber (2). Circular and star-shaped chambers (2) are described.