Patent ID: 6449091
Filing Date: 2002-09-10
Classification: G02F,Y10S

Abstract:
A method of tuning a polarization independent optical isolator, having an input end, an output end and an isolating portion, for providing a maximum isolation response at a predetermined wavelength in a reverse direction from the output end towards the input end when light is launched into the optical isolator, the isolating portion comprising a first polarizing element, a second polarizing element and a polarization rotating element disposed there between, the method comprising the steps of:a) launching a beam of light, having a longitudinal axis, into an end of the optical isolator and directed at another end so that the beam of light traverses the isolating poition; and b) varying the orientation of all the elements in the isolating portion, simultaneously, with respect to said beam of light including rotating the isolating portion about a longitudinal axis thereof, and varying the angle at which the beam of light is incident upon the isolating portion to tune the optical isolator until a desired wavelength, other than the predetermined wavelength, is measured for a substantially maximum isolation peak.