Patent ID: 8620120
Filing Date: 2013-12-31
Classification: G01D,G02B,Y10T

Abstract:
1. A photonic integrated circuit comprising at least one signal processing circuit, the at least one signal processing circuit comprising at least one input coupling element for coupling incident light from a predetermined incoupling direction into the photonic integrated circuit, and at least one output coupling element for coupling light out of the photonic integrated circuit into an outcoupling direction, the photonic integrated circuit being configured such that light coupled into the photonic integrated circuit through the input coupling element is propagated through and processed in the signal processing circuit and coupled out of the output coupling element, wherein the relation between the incoupling direction and the outcoupling direction is different from a relation for reflection at a surface according to the law of reflection, the incoupling direction and the outcoupling direction being substantially opposite so that retro-reflective operation is obtained and the light is sent back into the direction it originated from.