We investigate the generation of random numbers via the quantum process of spontaneous Raman
scattering. Spontaneous Raman photons are produced by illuminating a highly nonlinear
chalcogenide glass (As2S3) fiber with a CW laser at a power well below the stimulated Raman
threshold. Single Raman photons are collected and separated into two discrete wavelength
detuning bins of equal scattering probability. The sequence of photon detection clicks is converted
into a random bit stream. Postprocessing is applied to remove detector bias, resulting in a final bit
rate of 650 kb/s. The collected random bit-sequences pass the NIST statistical test suite for one
hundred 1 Mb samples, with the significance level set to a ¼ 0:01. The fiber is stable, robust and
the high nonlinearity (compared to silica) allows for a short fiber length and low pump power
favourable for real world application.