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Wavelength dependence of 1/f noise in the light output of laser diodes: an experimental study

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1 Author(s)
Fronen, R.J. ; Eindhoven Univ. of Technol., Netherlands

The optical power emitted by a monomode GaAlAs laser is filtered with a monochromator. The 1/f noise in the filtered emission is found to be directly dependent on the noncoherent emission, such as SpαPncm. Here sp is the spectral density of the 1/f fluctuations, Pnc is the average noncoherent power, m=3/2 under spontaneous emission, and m=4 in the superradiation and laser regions. Study of the 1/f noise in the optical power in a band centered at the laser wavelength and with variable bandwidth shows three operating regions. (1) LED region (at low currents): the fluctuations with a 1/f spectrum are uncorrelated in wavelength. (2) Superradiation region (at currents close to the threshold): the fluctuations are correlated. (3) Laser region: the 1/f noise apparently is dominated by noncoherent emission within a small optical band around the laser wavelength

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Quantum Electronics, IEEE Journal of  (Volume:26 ,  Issue: 10 )