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We experimentally demonstrate 18×64-Gb/s Nyquist PDM-16QAM signal transmission over 800-km single-mode fiber. The receiver matched filtering and channel's linear impairment compensation are jointly processed with a single linear filter, greatly reducing the computational complexity.
We show that fiber nonlinearity compensation of just the training sequence improves the nonlinearity-limited performance of training-aided m-QAM systems. Experimental results demonstrate transmission performance improvement by 0.4 dB for a 120-Gb/s 64-QAM 800-km system.
We experimentally demonstrate a flexible method of generating wide bandwidth OFDM superchannels using a software-programmable wavelength selective switch to combine modulated pulses. We transmit 279 × 40 Gbit/s over 400 km as a proof of concept.
A LCOS WSS implements an optical inverse Fourier transform for 10-Tb/s OFDM signal generation and cyclic prefix insertion. After 857.4 km of dispersion uncompensated transmission, a second WSS implemented optically-banded digital subcarrier demultiplexing.
We experimentally demonstrate a flexible signal generator that can simultaneously generate arbitrary mixes of variable-bandwidth OFDM superchannels, and gridless WDM and OTDM channels. The device is based on reconfigurable multi-input pulse-shaping of data-modulated pulses.
We report a two-stage frequency domain equalization method for non-data-aided coherent polarizationmultiplexed 16-QAM system. Robust performance against polarization-mode-dispersion and long-haul transmission is experimentally demonstrated using cascaded blind CD compensation and dual-mode adaptive equalization.
We propose a technique for polarization-mode-dispersion (PMD) estimation in 16-QAM coherent polarization-multiplexed single-carrier system using complementary Golay training sequences and channel response filter analysis. The technique is experimentally proved to be fast and highly accurate.
We experimentally demonstrate coherent polarization-multiplexed QPSK and 16QAM single-carrier system with frequency-domain-equalization over 800-km in-line transmission using binary training sequences. The sequences are designed to be practical and achieve accurate channel estimation in full-system demonstration.
We present a novel moments-based method for optical signal-to-noise ratio (OSNR) monitoring in polarization-multiplexed coherent optical systems. The method is experimentally demonstrated to show high accuracy in OSNR monitoring over a large range for both constant and non-constant modulus modulation formats.
We propose and experimentally demonstrate a novel frequency-domain blind equalizer based on the multi-modulus algorithm for the 16 QAM coherent optical system. The algorithm is shown to have good performance over a long transmission distance.
We present a dual-stage equalization method for long-haul coherent polarization-multiplexed systems. Blind CD compensation and adaptive multi-modulus equalization are both implemented in frequency-domain to allow zero overhead transmission with least complexity. Experiment is conducted to show good performance for both QPSK and 16-QAM systems.
We propose using low bandwidth coherent receivers for distributed optical performance monitoring. We demonstrate OSNR monitoring of a 40-Gbit/s polarization multiplexed CO-OFDM signal with a 0.8-GHz receiver using both data aided and blind approaches.
In the past decades, it has become clear that superoxide radical (O2·−) can be generated from photosystem II (PSII) during photosynthesis. Depending on the extent of its accumulation, O2·− plays an important role in plant physiology and pathology. The photoinhibition/repair cycle is a typical process in PSII which is mainly responsible for the survival of plants under the photoinihibition condition...
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