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We propose a novel scheme for accurately determining hundred-hertz linewidthby delayed self-heterodyne method in which delay time far less than the laser'scoherence time. That exceeds the former understanding as to the delayedself-heterodyne technique which requiring a prohibitively long fiber. Theself-heterodyne autocorrelation function and power spectrum are evaluated andby numerical analysis we ensure that -3dB of power spectrum is applied to theself-heterodyne linewidth measurements. For laser linewidth less than 100 Hz,linewidth can be measured directly by 10 km fiber, and in more general caselinewidth can be deduced from -20 dB or -40 dB of the fitting Lorentzian curve.

A novel scheme for hundred-hertz linewidth measurements with self-heterodyne method