We have qualitatively studied the impact of the number of
speckle patterns on the SNR. To do so, a diaphragm has been
placed in the Fourier plane of the output multimode fiber in
order to vary the number of signal beam speckle patterns on
the OASLM. For a constant average signal intensity on the
OASLM, SNR is measured as a function of diaphragm
diameter (Figure 10), evidencing up to 10dB SNR gain
between 2.8mm diameter diaphragm and 1.3mm diameter
diaphragm.