Influence of extrinsic FM noise on laser diode linewidth measured by self-heterodyning

Ries, R.; Favre, F.; Guen, D. Le

doi:10.1016/0030-4018(86)90096-9

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…In this limit the ratio of the spectral intensity in the flat part of the spectrum over that residing underneath the delta function is a direct measure for the quantum-limited contribution to the laser linewidth where fRsW is the (radio) bandwidth of the filter used in the spectrum analyzer. When the FM noise is not white but colored, the self-heterodyne spectrum is unfortunately much harder to calculate [9].…”

Section: Theory Of Self-heterodyne Detectionmentioning

confidence: 99%

Excess phase noise in self-heterodyne detection

Exter

Kuppens

Woerdman

1992

IEEE J. Quantum Electron.

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Self-heterodyne detection is a popular method to determine the linewidth of a laser. However, the interpretation of self-heterodyne spectra is difficult if, apart from spontaneous emission, additional noise sources are present. Measurements on an external-cavity semiconductor laser show how, for a reiatively 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 lineing the optical spectrum non-lorentzian and the self-heterodyne signal hard to interpret. This phase noise Often has ''few" high-frequency components so the tical spectrum will still have "Lorentzian" wings, dropping off like 1 /f2, wherefis the frequency deviation from line center, but its peak will be flattened and broadened.We have studied these issues experimentally for light from an extemal-cavity semiconductor laser. The heterodyne Spectrum of this laser light could not be fitted width is larger than this due to excess low-frequency fluctuations, which are shown to result from the presence of side modes.

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Section: Theory Of Self-heterodyne Detectionmentioning

confidence: 99%

Excess phase noise in self-heterodyne detection

Exter

Kuppens

Woerdman

1992

IEEE J. Quantum Electron.

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Frequency noise analysis of optically self-locked diode lasers

Laurent

Clairon

Bréant

1989

IEEE J. Quantum Electron.

226

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Laser frequency stabilization by means of optical self-heterodyne beat-frequency control

et al. 1998

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We propose and demonstrate a novel frequency-stabilization scheme that provides linewidth narrowing and at the same time is compatible with high-speed frequency agility. The method relies on sensing and control of a heterodyne beat signal derived from a fiber interferometer and functions in the absence of a fixed reference frequency. Our demonstration utilizes a short-external-cavity diode laser equipped with an intracavity electro-optic crystal for frequency correction. The stabilization method is shown to suppress impressed laser frequency modulation by nearly 2 orders of magnitude. Without further modification of our scheme we also demonstrate laser frequency tuning control.

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Influence of extrinsic FM noise on laser diode linewidth measured by self-heterodyning

Cited by 3 publications

References 6 publications

Excess phase noise in self-heterodyne detection

Excess phase noise in self-heterodyne detection

Frequency noise analysis of optically self-locked diode lasers

Laser frequency stabilization by means of optical self-heterodyne beat-frequency control

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