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Characterization of the noise and correlations in harmonically mode-locked lasers

Summary: Characterization of the noise and correlations in
harmonically mode-locked lasers
Farhan Rana, Harry L. T. Lee, Rajeev J. Ram, Matthew E. Grein, Leaf A. Jiang, Erich P. Ippen, and
Hermann A. Haus
Research Laboratory for Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Received December 11, 2001; revised manuscript received April 16, 2002
In a harmonically mode-locked laser multiple optical pulses propagate inside the laser cavity. The noise in
different pulses inside the laser cavity is in general correlated. Information regarding the sign and magni-
tude of the noise correlations is contained in the distribution of the spectral weight among the supermode noise
peaks that appear in the pulse energy and timing noise spectral densities. We show that the supermode noise
spectrum obtained experimentally by measurement of the photodetector current noise spectral density can be
used to determine the correlations in the energy and the timing noise of different pulses in the laser cavity.
We also present simple models for the timing noise in harmonically mode-locked lasers that demonstrate the
relationship between the noise correlations and the supermode noise peaks. 2002 Optical Society of
OCIS codes: 140.4050, 270.2500, 320.5550.
Harmonically mode-locked lasers are attractive as
sources of high-repetition-rate optical pulses that can be
used in electro-optic sampling, optical analog-to-digital


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


Collections: Engineering