Abstract
Silicon photonics which is compatible with mature complementary metal oxide
semiconductor (CMOS) fabrication process has been extensively demonstrated for
monolithic integration of photonic and electrical circuits. We show that an integrated
silicon Mach-Zehnder modulator (MZM) may be used for advanced modulation formats despite
the nonlinear dependence of refractive index change with applied voltage in the
free-carrier depletion modulator. We experimentally demonstrated the use of a silicon
MZM for direct detection optical orthogonal frequency division multiplexing (DDO-OFDM)
modulation with advanced data formats of quadrature phase-shift keying (QPSK), 8
phase-shift keying (8PSK) and 16-quadrature amplitude modulation (16-QAM). The measured
bit error rate performance of the back-to-back and 50 km single mode fiber transmission
of each format is well below the forward error correction limit.
© 2013 IEEE
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