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We identify experimentally the effects of laser linewidth and intensity noise on optical OFDM systems, and show that commercial DFB lasers are suitable transmitters even when operated at low powers.
A novel polarization-frequency-multiplexing scheme is implemented to suppress noise in a fiber-based Gaussian-modulated coherent-state quantum key distribution system. The achievable secrete key rate is 0.30 bit/pulse with a 5 km-fiber and 0.05 bit/pulse with a 20 km-fiber.
We use the cost-effective APM technique to increase the non-linear tolerance of NRZ-OOK, and we demonstrate, in a recirculating loop experiment, the transmission over 2800 km SSMF of 16 NRZ-OOK 40 Gb/s channels with 100 GHz spacing.
An on-line monitoring and auto-restorable scheme for injection-locking of FPLD by using an integrated monitoring photodiode to achieve auto locking restoration in 50 seconds with Q factor >7 and SMSR >35 dB at 2.5 Gbit/s.
We experimentally demonstrate a scheme for reshaping 40 Gb/s packets that is wavelength-preserving. The scheme, based on cross-gain-compression in an SOA, is polarization-independent and does not suffer from any transient effect at packet edges.
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