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This document describes a method for measuring laser phase noise using a digital coherent receiver. It records the beat signals between a laser under test and two independent reference lasers. It explains how to extract the frequency modulation (FM) noise spectrum of just the test laser from the three recorded beat signals, after correcting for measurement equipment non-idealities. The method is demonstrated by presenting the FM noise spectra of a distributed feedback laser and an external cavity grating-tu

Author

Jesus Perez

Language

EN