Abstract

I propose and demonstrate the use of the recirculating delayed self-heterodyne (DSH) method for measuring FM noise power spectral densities (PSDs), which are the most fundamental measure characterizing the spectral purity of laser sources. By analyzing the DSH beat signals with 1, 10, and $160\mathrm{km}$ delays, the FM noise PSD of a narrow- linewidth fiber laser is evaluated for Fourier frequency range between $10\mathrm{Hz}$ and $100\mathrm{kHz}$, which exhibits flicker noise as the dominant contribution.

© 2011 Optical Society of America

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