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We propose and demonstrate a scheme that suppresses degradation induced by in-band crosstalk and amplified spontaneous emission (ASE) noise in differential phase shift keying signal, using feedforward control. Though in-band crosstalk in wavelength division multiplexing networks or ASE from optical amplifiers degrades system performance, we can suppress the degradation using the feedforward control.
We demonstrate optical carrier regeneration for wavelength reuse in a multicarrier distributed OADM network. It is possible to achieve a high-quality regenerated signal even though the employed data signal for wavelength reuse is drastically degraded.
A full-duplex CATV/Radio-over-fiber (ROF) transport system employing a phase modulator as wavelength reuse and remodulation schemes is proposed and demonstrated. Good performances were achieved for downstream and upstream over a 20-km transmission.
We experimentally demonstrate vector signals transmission over 60-GHz RoF systems using single-sideband modulation based on an injection-locked DFB laser. Both 1-Gb/s QPSK and 1.2-Gb/s 16QAM transmission over 50-km SSMF are realized successfully.
We experimentally demonstrate simultaneous two-channel wavelength conversion of 40-Gbit/s RZ-DPSK WDM signals using four-wave mixing (FWM) in a highly nonlinear fiber (HNLF) without additional pumps. A power penalty of <1 dB is observed as channel spacing varies from 200 GHz to 1 THz.
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