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Manipulation of optical signals with tunablity and reconfigurability is essential for high-speed systems or networks. We review tunable photonic microwave signal generation and filtering, followed by all-optical signal processing in polarization-division-multiplexed systems.
We have proposed a fiber-optic spectrum shaper that can generate optical spectrum with variable shapes. The simulation results verified the diversity of the output optical spectrum and the experimental results are shown to demonstrate the effectiveness of this spectrum shaper.
A photonic comb filter with digitally tunable bandwidth and frequency spacing is proposed. Using cascaded differential-group-delay (DGD) element and polarization switch based filters, we demonstrate independent tunability of both parameters with >; 12-dB first-sidelobe reduction for a 6-bit configuration. Limitations of such an approach are also discussed.
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