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Photon noise and correlations in semiconductor cascade lasers Farhan Ranaa)

Summary: Photon noise and correlations in semiconductor cascade lasers
Farhan Ranaa)
and Rajeev J. Ram
Research Laboratory for Electronics, Massachusetts Institute of Technology, Cambridge,
Massachusetts 02139
Received 24 August 1999; accepted for publication 4 January 2000
A comprehensive model for photon noise and correlations in semiconductor cascade lasers is
presented. Photon emission events in different gain sections of cascade lasers are correlated. These
correlations are found to be positive and arise because the gain sections are connected electrically.
The scaling of photon correlations and intensity noise with the number of cascade sections is
discussed. The model presented in this letter is applicable to a variety of cascade laser structures
including bipolar interband cascade lasers and unipolar intersubband cascade lasers. For
comparison, photon noise and correlations in parallel lasers arrays are also discussed. 2000
American Institute of Physics. S0003-6951 00 03109-0
In semiconductor lasers, each electron or hole injected
into the device emits at best a single photon. In semiconduc-
tor cascade lasers, electrons or holes are recycled from one
gain stage to the next such that each carrier injected into the
device is capable of producing as many photons as the num-
ber of cascaded gain stages. The slope efficiency W/A of


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


Collections: Engineering