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For efficiently transferring radio-frequency (RF) signals to remote places using Radio-over-Fiber (RoF) techniques, it is important to increase optical power of RoF signals launched to optical fiber links. Fiber nonlinearity is going to be a critical obstacle against such high-power operation. To cope with this problem, we have proposed a transfer system of digitally data-modulated RF signals over...
We experimentally demonstrate fiber-nonlinearity-tolerant conjugated-paired radio-on-fiber (C-RoF) system for the first time. A C-RoF signal is simply generated by dual-sideband modulation and fiber nonlinearity is cancelled through asymmetric photonic heterodyne down-conversion. A QPSK-C-RoF signal is transferred over 20-km SMF fiber.
We experimentally demonstrate generation of polarization-multiplexed phase-conjugated twin signals by using oppositely-biased dual-polarization IQ modulators, compensating for nonlinear signal distortion in fiber transmission. Bias condition is optimized investigating nonlinearity tolerance of the generated signals transmitted over SMF.
We propose and demonstrate phase-conjugated twin signals generation using oppositely-biased paired IQ modulators. Phase conjugation is electro-optically realized without relying on electrical-domain processing. Nonlinear phase shift of 20-Gb/s QPSK is experimentally compensated for.
Optical quadrature-amplitude modulation (QAM) enables high-spectral-efficiency transmission, where we can generate high-order optical multilevel signals, combined from multiple low-order multilevel signals (like binary streams). This signal combining approach is useful because it is difficult to directly generate multilevel signals at high symbol rate beyond ∼10 Gbaud. Electrical combining is one...
Instead of using eight-level electronics or highly-integrated optics, 64QAM generation is experimentally demonstrated using two tandem IQ modulators with four-level electronics. The complexity in electronics and optics is well-balanced. 16QAM and 36QAM are also synthesized.
We experimentally investigate the nonlinear distortion in QAM constellation due to the imbalance detection in intradyne coherent receivers. The nonlinear distortion causes symbol spread, especially in the outer and inner symbols in the reconstructed constellation.
We experimentally demonstrate a 160-Gb/s tunable and phase-transparent wavelength conversion using cSFG-DFG in a linear-chirped PPLN. Thanks to the enhanced conversion bandwidth, no any optical equalizer was required to compensate the spectrum distortion.
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