Abstract
A novel ultrahigh-speed all-optical demultiplexer (DMUX) with
polarization-shift-keying (PolSK) modulation input signals is proposed. This design
is based on four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). For
analyzing each amplifier, we use finite-difference method (FDM) based on solution of
the traveling wave coupled equations. Using numerical simulation, the all-optical
DMUX is theoretically realized at 40 Gb/s. We also study the relation between
optical confinement factor and thickness of active layer of the SOA section
successfully, and investigate the increasing effect of confinement factor on the
DMUX optical output power. With this work, the confinement factor is increased from
0.3 to 0.48, and as a result, the output power approximately twice ofits initial
value is achieved. Moreover, the effects of polarization dependence of SOA on the
output performance of all-optical DMUX for PolSK signal are theoretically
investigated in detail.
© 2012 Chinese Optics Letters
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