Patent ID: 6559946
Filing Date: 2003-05-06
Classification: G01M

Abstract:
A method for minimizing the effects of noise when measuring a response of a device under test to laser light comprising:imparting time-varying interference modulations to a laser light to produce a time-varying interference modulated test laser light and a time-varying interference modulated reference laser light; propagating the time-varying interference modulated test laser light to the device under test so as to cause the device under test to propagate responsive time-varying interference modulated test laser light; converting the responsive time-varying interference modulated test laser light to a responsive amplitude modulated electrical test signal; high pass filtering the responsive amplitude modulated electrical test signal; and processing the high pass filtered amplitude modulated electrical test signal so as to produce a time-varying electrical signal that represents the responsive time-varying interference modulated test laser light propagated by the device under test in response to the time varying interference modulated test laser light.