论文信息 - Excess phase noise in self-heterodyne detection

Excess phase noise in self-heterodyne detection

The interpretation of self-heterodyne spectra is difficult if, apart from spontaneous emission, additional noise sources are presented. Measurements on an external-cavity semiconductor laser show how, for a relatively long delay, the high-frequency (Lorentzian) wings of the self-heterodyne spectrum are a sensitive measure for the quantum-limited (Schawlow-Townes) laser linewidth. The quantum-limited laser linewidth is shown to be inversely proportional to the output power. Values below 5 kHz are routinely measured. The full width at half maximum (FWHM) laser linewidth is larger than this due to excess low-frequency fluctuations, which are shown to result from the presence of side modes. >

J. P. Woerdman | M. P. Exter | M. P. van Exter | S.J.M. Kuppens | S. Kuppens

[1] Roy,et al. Noise in nearly-single-mode semiconductor lasers. , 1989, Physical review. A, General physics.

[2] F. Favre,et al. 82 nm of continuous tunability for an external cavity semiconductor laser , 1991 .

[3] Philippe Gallion,et al. Quantum phase noise and field correlation in single frequency semiconductor laser systems , 1984 .

[4] Hamel,et al. Observation of enhanced fundamental linewidth of a laser due to nonorthogonality of its longitudinal eigenmodes. , 1990, Physical review letters.

[6] K. R. Manes,et al. Observation of quantum phase fluctuations in infrared gas lasers , 1971 .

[7] Takeshi Kamijoh,et al. Narrow linewidth (85 kHz) operation in long cavity 1.5 mu m-MQW DBR laser , 1991 .

[8] A. Clairon,et al. Frequency noise analysis of optically self-locked diode lasers , 1989 .

[9] K. Kikuchi. Effect of 1/f-type FM noise on semiconductor-laser linewidth residual in high-power limit , 1989 .

[10] Influence of extrinsic FM noise on laser diode linewidth measured by self-heterodyning , 1986 .

[11] E. Bødtker,et al. Measurement of Rayleigh backscatter-induced linewidth reduction , 1985 .

[12] L. Richter,et al. Linewidth determination from self-heterodyne measurements with subcoherence delay times , 1986 .

[13] Dependence of the linewidth of a semiconductor laser on the mode distribution , 1990 .