Abstract
Interferometric noise in optical communication systems employing reflective
modulation schemes can be mitigated by reshaping the data spectrum to reduce
the spectral overlap with backscattered and backreflected light. A novel analytical
model, capable of analyzing accurately the performance of modulation formats
with a wide optical spectrum, is derived here and applied to study the case
of interferometric noise caused by Rayleigh backscattering. Compared to more
complex models and simulations the new method is fast, simple to implement,
and gives clear insight into the physical phenomena involved. In addition,
the performance of practical systems can be easily analyzed and optimized
due to the capability of the model to include real component specifications
such as arbitrary optical and electrical filter responses. The specific case
of phase-modulated non-return to zero (PM-NRZ) modulation format is used to
validate the model against experimental results and excellent agreement is
obtained. The PM-NRZ performance is also investigated as a function of various
parameters, quantifying, for example, the trade-off between phase modulation
index and interferometric noise mitigation.
© 2008 IEEE
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