Patent ID: 6813027
Filing Date: 2004-11-02
Classification: G01M

Abstract:
A method of determination of an optical property of an optical device under test comprising:splitting an incoming light beam into a first initial light beam and a second initial light beam; splitting said first initial light beam into a first light beam and a second light beam; coupling the first light beam into the optical device under test; letting the second light beam travel a different path from the first light beam; superimposing the first and the second light beam to produce interference between the first light beam and the second light beam in a resulting first superimposed light beam; detecting the power of the first superimposed light beam for deriving a first signal over time containing information about the optical property of the device under test when tuning a frequency of the incoming light beam over a given frequency range; splitting the second initial light beam into a third light beam and a fourth light beam; superimposing the third and the fourth light beam after the third and fourth light beams have traveled a different path, to produce interference between the third and the fourth light beam in a resulting second superimposed light beam; detecting the power of the resulting second superimposed light beam for deriving a second signal over time containing information about a time dependence of a frequency when tuning a frequency of the incoming light over a given frequency range; compensating a time-delay between the first and the second signal; and deriving a frequency dependency of the first signal for deriving the optical property of the optical device under test.