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Photon noise correlations in electrically coupled semiconductor lasers P. M. Mayer,a)

Summary: Photon noise correlations in electrically coupled semiconductor lasers
P. M. Mayer,a)
F. Rana, and R. J. Ram
Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue,
Cambridge, Massachusetts 02139
Received 26 September 2002; accepted 27 November 2002
Measurements of the correlation between the photon noise of two semiconductor lasers sharing a
bias circuit are presented. The photon noise of the electrically coupled lasers is found to be
correlated by as much as 70%. The photon noise correlations are measured at low frequencies as a
function of the bias current for lasers connected in series and in parallel, and for high and low
impedance biases. The magnitude and sign of the noise correlations are consistent with theoretical
expectations. 2003 American Institute of Physics. DOI: 10.1063/1.1539548
In semiconductor lasers, the noise in the emitted photon
stream depends on both the internal dynamics of the laser
and the electrical circuit used to bias the laser.1,2
the noise on the bias current of the laser receives contribu-
tions not only from external sources such as the thermal
noise of resistances in the bias circuit, but also from the laser
itself. In cascade lasers, or when multiple lasers are biased in


Source: Afshari, Ehsan - School of Electrical and Computer Engineering, Cornell University


Collections: Engineering