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Digital coherent optical communication technologies have shown superior performance in supporting high-bit-rate optical communications, including high fiber chromatic dispersion (CD) and polarization mode dispersion (PMD) tolerance, and high spectral efficiency. We review the typical system design and principles of dual-polarization digital coherent optical communications, and further show a new dual-stage...
Novel approach to generate optical quadrature duobinary (QDB) signals is experimentally achieved using single optical delay interferometer, which can simultaneously convert multiple WDM QPSK channels into optical QDB format, enabling better filtering tolerance and high scalability.
We have experimentally demonstrated 42.8 Gb/s DWDM transmission over 3900 km SMF-28 with 12.5-GHz channel spacing and coherent detection. Eight polarization-multiplexed-RZ-QPSK signals have been successfully transmitted over 3000 and 3900-km SMF-28 with BER< 8 ?? 10-4 and 2 ?? 10-3, repetitively.
We present a power-variable rate-adaptive LDPC-coded polarization multiplexed coherent OFDM scheme, suitable for use in optically-routed networks in which different lightwave paths experience different penalties due to deployment of ROADMs and WXCs. We demonstrate that channel capacity can be closely approached with proposed scheme.
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 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...
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