Patent ID: 9207517
Filing Date: 2015-12-08
Classification: G02F,H01S

Abstract:
1. An optical isolator for optically isolating an optical system, the optical system outputting electromagnetic radiation at predetermined ranges of frequencies, the optical isolator comprising: a filter optically coupled via a fiber after the output of said optical system, said filter receiving said electromagnetic radiation of predetermined ranges of frequencies from said optical system, said filter allowing only electromagnetic radiation of said predetermined ranges of frequencies to pass therethrough, and blocking electromagnetic radiation outside said predetermined ranges of frequencies; and a Raman shifter, optically coupled via a fiber after the output of said filter, said Raman shifter receiving said electromagnetic radiation of predetermined ranges of frequencies from said filter, said Raman shifter shifting the frequencies of said electromagnetic radiation through Raman scattering into a plurality of shifted frequencies outside said predetermined ranges of frequencies, for enabling filtering said plurality of shifted frequencies in case of back reflections toward said optical system, wherein said plurality of shifted frequencies traveling in free space after said Raman shifter, wherein a portion of said plurality of shifted frequencies are back-reflected via free space toward said Raman shifter and said filter from an external object in an environment of said optical system located after said Raman shifter.