Patent ID: 9081090
Filing Date: 2015-07-14
Classification: G01J,G01S,G02B,H01S

Abstract:
1. A system for compensating for a phase variance of a laser source comprising: a phase difference detector configured to receive a reference arm signal and to detect a phase difference of the reference arm signal, the phase difference corresponding to a difference in the phase of the reference arm signal at two points in time; a phase correction estimator configured to receive the phase difference from the phase difference detector and to estimate a phase correction to be applied to a target arm signal, wherein the phase correction compensates for the phase variance of the laser source; a phase modulator configured to receive the phase correction from the phase correction estimator, to modulate the target arm signal with the phase correction, and to output a phase corrected target arm signal; and a delay coupled either to the reference arm signal and configured to introduce a delay time into the reference arm signal prior to being received by the phase difference detector or to the target arm signal prior to being received by the phase modulator, wherein the delay time comprises at least a round trip path delay.