Optical system coupling a rectangular light source to a circular light receiver

摘要: A light source of rectangular outline, such as a semiconductor laser, is coupled to receiver circular outline be illuminated thereby, an end optical fiber, by anamorphotic system including pair spherical lenses and afocal cylindrical interposed in telecentric field therebetween. When the used for measuring attenuation fiber back-scattering technique, semireflecting prism inserted between fiber-side lens directs part returning beam toward photodetector; effect spurious reflections at may minimized use polarization-sensitive Glan and/or positioning flat transparent plate front end.