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A multi-functional photonic circuit implemented
on silicon on insulator (SOI) platform is reported. Eight phase modulators are
connected to provide four Mach-Zehnder interferometer structure in parallel.
Multimode interference couplers are used as the splitter/combiner of the MZI
structures to provide static DC bias. This architecture generates two principle
spatially separated 1st order harmonics from a single light source,
which may be collected from separate ports without using any optical
demultiplexing filters which permits remote heterodyning. A carrier suppression
of >20 dB and spurious sideband suppression > 12 dB relative to the
principle harmonics is achieved with bias voltage tuning only. In addition to
the frequency conversion, the circuit can also perform as a sub-carrier
generator, IQ modulator and frequency multiplier.