Patent ID: 8743458

Claim:
Optical insulator comprising: a Faraday rotator comprising one or more Faraday media and a magnet arrangement which enables accommodation of several Faraday media ( 4 ); and a first polarizer arrangement upstream of the Faraday media ( 4 ); a second polarizer arrangement downstream of the Faraday media, wherein the magnet arrangement comprising magnets forming a free aperture wherein the Faraday media is located within the free aperture, and wherein the first polarization arrangement splits the optical radiation into two radiation parts, which are polarized perpendicularly with respect to one another, at an exactly defined angle and offset, or superimposes two radiation parts, which are polarized perpendicularly with respect to one another, at an exactly defined angle and offset, and the first and second polarizer arrangements enable alignment of the polarizer surfaces with respect to one another of better than 10″.