Optical isolator for fiber-optic communication

Abstract

The utility model relates to an optical isolator for fiber-optic communication, which is characterized in that a positive polarization state control component, an insulator component and a negative polarization state control component are parallelly arranged along a light transmission direction in turn.The positive polarization state control component is comprised of a first linear polarizer and a first quarter wave plate, which are parallelly arranged along the light transmission direction in turn.The isolator component is comprised of a first high-reflectivity reflector, a Faraday rotator, a second high-reflectivity reflector and a permanent magnet, which are parallelly arranged along the light transmission direction in turn.The negative polarization state control component is comprised of a second quarter wave plate and a second linear polarizer, which are parallelly arranged along the light transmission direction in turn.The optical isolator has the advantages that the change in a Faraday rotation angle does not deteriorate the performance of the optical isolator seriously, so that the requirements on the temperature stability of Faraday magneto-optic materials are lowered.A 40 to 65dB or above isolation degree requirement can be met by simply using single-stage isolation.Light beams do not displace transversely, the light path is short, and the miniaturization of elements can be realized.