Abstract
Based on the computed exact probability density functions (PDFs), we
analyze the conventional Gaussian approximation (GA) method and the
thresholding-based bit error rate (BER) measurement method in back-to-back
optical differential phase shift keying (DPSK) systems with balanced
detection for the purpose of margin measurement in noise-loading
experiments. We show that the GA method fails when used with DPSK systems in
contrast to its success in the case of on-off keyed (OOK) systems, and as a
result, the thresholding method is not as robust for DPSK systems as it is
for OOK systems. Still, our results show that the thresholding method, when
using reasonably small threshold bias, can measure large performance margins
for DPSK systems with a wide range of $E_b/N_0$ (the energy bit to noise power spectral density ratio) and
optical bandpass filter (BPF) bandwidth, and receiver imperfections such as
the PIN responsivity imbalance and frequency detuning. We further discuss
briefly on BER estimation for nonlinear fiber transmission.
© 2010 IEEE
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