Patent ID: 7725043
Filing Date: 2010-05-25
Classification: H01S,H04B

Abstract:
1. A system for controlling noise in a laser source comprising: first means for providing external feedback to said laser source such that noise in a laser output generated by said laser source varies depending on a bias current of said laser source, wherein said bias current is a current applied to a laser diode of said laser source to produce said laser output, and second means for adjusting said bias current such that said noise is at a desired level, wherein said second means includes a noise measuring circuit adapted to detect noise in said laser output and in accordance therewith generate noise measurements, and wherein said noise measuring circuit includes means for detecting said laser output and converting it to an electrical signal and means for rejecting signals in said electrical signal that are located at frequencies of said input signal and means for amplifying said electrical signal and means for integrating said electrical signal over a selected frequency bandwidth to generate said noise measurements.