Abstract: A device for a sending and receiving unit of a communication arrangement is provided. The device includes: a first passage for electromagnetic waves and a second passage for electromagnetic waves; a partially transparent surface which is transparent for electromagnetic waves of a first wave length range and which is reflective for electromagnetic waves of a second wave length range, wherein the second wave length range differs from the first wave length range; and a first retroreflective surface which is retroreflective for electromagnetic waves of the first wave length range. A direction of reflection of the electromagnetic waves of the first wave length range differs from a direction of reflection of the electromagnetic waves of the second wave length range if the electromagnetic waves of the first wave length range as well as the electromagnetic waves of the second wave length range are incoming through the same passage.

Abstract: A device for a sending and receiving unit of a communication arrangement is provided. The device includes: a first passage for electromagnetic waves and a second passage for electromagnetic waves; a partially transparent surface which is transparent for electromagnetic waves of a first wave length range and which is reflective for electromagnetic waves of a second wave length range, wherein the second wave length range differs from the first wave length range; and a first retroreflective surface which is retroreflective for electromagnetic waves of the first wave length range. A direction of reflection of the electromagnetic waves of the first wave length range differs from a direction of reflection of the electromagnetic waves of the second wave length range if the electromagnetic waves of the first wave length range as well as the electromagnetic waves of the second wave length range are incoming through the same passage.

Abstract: An optical detector with an arrangement of several semiconductor layers has at least one zone absorbing in a predetermined wavelength region, at least one zone which is at least partially light-permeable in the predetermined wavelength region, one semiconductor layer which is absorbing in the predetermined wavelength region, a semiconductor layer which is located under the first mentioned semiconductor layer and is at least partially light-permeable in the predetermined wavelength region, the at least one light-permeable zone is formed as an interruption in the absorbing semiconductor layer, and a throughgoing doping provided on an upper surface of the absorbing semiconductor layer which surrounds the interruption and at least a part of an upper surface of the at least partially light-permeable semiconductor layer, wherein, the optical detector is produced by a new method and used for various applications.

Abstract: An optical detector with an arrangement of several semiconductor layers has at least one zone absorbing in a predetermined wavelength region, at least one zone which is at least partially light-permeable in the predetermined wavelength region, one semiconductor layer which is absorbing in the predetermined wavelength region, a semiconductor layer which is located under the first mentioned semiconductor layer and is at least partially light-permeable in the predetermined wavelength region, the at least one light-permeable zone is formed as an interruption in the absorbing semiconductor layer, and a throughgoing doping provided on an upper surface of the absorbing semiconductor layer which surrounds the interruption and at least a part of an upper surface of the at least partially light-permeable semiconductor layer, wherein the optical detector is produced by a new method and used for various applications.

Abstract: The optical signal transmission system includes one or more optical wave guide switches (11 to 15) for switching between transmission paths for transmission of light signals and an optical level adjusting device (16 to 24) connected with the one or more optical wave guide switches in at least one of the transmission paths. The optical level adjusting device (16 to 24) controls its own light transmittance with a thermooptic device (22,24) and the one or more optical wave guide switches (11 to 15) switch between transmission paths by a similar thermooptic device (14,15). The one or more optical wave guide switches and the optical level adjusting device are arranged in an integrated thermooptic circuit in a common substrate.