Patent ID: 6836575
Filing Date: 2004-12-28
Classification: G02B

Abstract:
An optical device comprising,a non-reciprocal combination-device having a principal direction and a reverse principal direction including (a) a first birefringent wedge having a first optical axis perpendicular to the principal direction, (b) a second birefringent wedge having a second optical axis perpendicular to the principal direction, the second optical axis forming a first angle with respect to the first optical axis, (c) a non-reciprocal rotating element optically coupled between the first and the second birefringent wedge and adapted to rotate a polarization of light passing there through by a second angle; and a polarizer adapted to polarize a first light signal traveling in the principal direction received from the second birefringent wedge and provide a polarized first light signal to a PM fiber and to a second light signal traveling in the reverse principal direction received from the PM fiber to provide a second polarized light signal.