Abstract
Polarization-based optical communications are attracting more
attention recently, where the crucial points are polarization features and
their measurements. Based on the Müller matrix method, we obtain
measurable expressions for the polarization-dependent gain (PDG) and the
loss of polarization orthogonality (LPO), while give the boundary of the
LPO for any PDG devices. We experimentally demonstrate that non-linear LPO
can be created in a semiconductor optical amplifier and find that the LPO
will slightly skim over the boundary near the threshold of the injected
current. Furthermore, an empirical formula is achieved to gauge the
LPO-induced power penalty, which is proven to be valid in differential
polarization shift-keying transmission by executing a bit error rate
measurement. Our conclusions are applicable to non-orthogonal polarization
cases and valuable to polarization-related communications, even orbital
angular momentum multiplexing.
© 2016 Chinese Laser Press
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