Patent ID: 6430338
Filing Date: 2002-08-06
Classification: G02B

Abstract:
An optical measuring device comprising an optical fiber, andan optical detector adapted to receive and measure an incident optical signal from the optical fiber, wherein: at least one of the optical fiber and the optical detector comprises an interface between optical media with different refractive indices, the interface is arranged angular with respect to the incident optical signal for reducing a return reflection in the direction of the incident optical signal, the transmission of light with a polarization perpendicular to the plane of incidence of the optical signal substantially equals the transmission of light with a polarization parallel to the plane of incidence of the optical signal, so that the transmission of the incident optical signal through the interface is substantially independent of the state of polarization of the incident optical signal, the transmissions of light with a polarization perpendicular and parallel to the plane of incidence of the optical signal being substantially balanced for a plurality of different wave lengths or for one or more wave length bands.