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As a modulation-format transparent nonlinear process, FWM is capable of generating complex optical signal constellations. In experiments and simulations, optical ASK-DPSK and 8-QAM signals are generated with one-step or two cascaded FWM processes, respectively.
We experimentally demonstrate a novel decision-aided maximum likelihood phase estimation in an 8-Channel 42.8-Gbit/s DWDM coherent PolMux QPSK system. The results show that our proposed algorithm can achieve a comparable performance as the Mth-power while having much lower computational complexity.
Dual-polarization operation of all-optical IFFT/FFT elements is demonstrated for the first time employing coupler interferometry. All-optical OFDM transmission at 100-Gb/s for two QPSK-PDM sub-carriers was experimentally performed using two matched 25 G DMZIs and coherent detection.
We propose a PON architecture based on orthogonal frequency division multiple access (OFDMA) technologies. The system produces transparent pipes for transmission of heterogeneous services. A virtual PON scheme based on OFDMA is further introduced.
Heavily Yb-doped (14300 ppm) preforms and fibers were prepared by the sol-gel method and dip coating-rapid thermal annealing technique. Optical properties of these preforms and fibers were measured and discussed. A fiber laser at a 1053-nm wavelength was realized and its slope efficiency was measured to be 88.4%. The excellent performance of the fiber laser and repeatability show that the novel approach...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
We experimentally demonstrate spectral efficient transmission of 40Gbps per channel in 50GHz-spaced DWDM exploiting optical carrier suppression and separation technique and optical duobinary modulation with less than 2.0dB power penalties at 10-10 BER and transmission distnces of over 200km.
By using multiple time modulation in the optical domain, we experimentally demonstrate a novel scheme employing different radio frequencies (RF) at the adjacent areas for reducing signal interference in a DWDM radio-over-fiber system.
We investigate the impact of off-center optical filtering plus electronic equalization for 10-Gb/s directly-modulated systems. Simulation results show the transmission distance over standard single-mode fiber is increased >6-times (from <25-km to >150-km) without optical dispersion compensation.
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