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We propose to use adaptive bit and power loading in digital subcarrier-multiplexing (SCM) systems based on time-domain hybrid QAM to increase optical filtering tolerance. 17.5% capacity improvement is achieved in experimental demonstrations.
We present a joint carrier phase recovery algorithm that can detect and correct cycle slips for coherent subcarrier multiplexing systems. The effectiveness of the proposed algorithm is demonstrated in both simulations and experiments.
We numerically show that the laser linewidth tolerance of Stokes-vector direct detection systems is limited by equalization-enhanced phase noise (EEPN). We also demonstrate the mitigation of the EEPN influence using maximum likelihood phase compensation.
Metasurfaces in metal/insulator/metal configuration have been widely used in photonics, with applications ranging from perfect absorption to phase modulation, but why and when such structures can realize what functionalities are not yet fully understood. Here, we establish a complete phase diagram in which the optical properties of such systems are fully controlled by two simple parameters (i.e.,...
Metal/insulator/metal metasurfaces have widely applications ranging from perfect absorption to phase modulation, but the mechanism of these functionalities are not yet fully understood. Here, based on a coupled-mode analysis, we establish a complete phase diagram through two simple parameters, which lays a solid basis for realizing functional and tunable photonic devices with such structures.
Metasurfaces in metal/insulator/metal configuration have recently been widely used in photonics research, with applications ranging from perfect absorption to phase modulation [1, 2], but why and when such structures can realize what kinds of functionalities are not fully understood. Here, based on coupled-model analysis, we establish a complete phase diagram for such systems, in which their optical...
An advanced digital backpropagation algorithm is proposed for subcarrier-multiplexing systems. Efficient intra-channel nonlinear compensation is experimentally demonstrated using this algorithm with 40 spans/step and 16 spans/step for QPSK and 16QAM formats, respectively.
We present advanced flexible modulation formats and reduced-complexity digital nonlinear compensation schemes to increase the capacity of next generation optical networks.
A new fuzzy active-disturbance rejection position controller of permanent magnet synchronous motor (PMSM) servo system is presented in this paper. The improved position and speed loop controller not only maintains the original features of controller, but also reduces the adjustable parameters, which makes control performance better. Through the analysis of cross-axis output equation, a new position...
A frequency domain M-shaped pulse with roll-off factors less than 1 is proposed and experimentally demonstrated to achieve a better nonlinearity tolerance than the RRC pulse for both PDM-QPSK and PDM-16QAM transmission systems.
We experimentally generate subcarrier multiplexed signals using high-speed DACs and demonstrate the improved nonlinearity tolerance over single carrier signals in long-haul coherent optical transmission systems.
An adaptive channel estimation method is proposed for zero-guard-interval CO-OFDM. The improvement in nonlinear tolerance, SOP tracking ability and residual CD tolerance compared to intra-frequency domain averaging is numerically and experimentally demonstrated.
We propose a wide-range, low-complexity frequency offset tracking algorithm for single carrier transmission systems. Its effectiveness is validated numerically and experimentally in a 112 Gb/s DP-QPSK system.
A new ISI-free frequency domain M-shaped pulse is proposed and experimentally verified to have better SPM tolerance than both RRC and optimized pulses in a 14Gbaud 56Gbit/s DP-QPSK system over dispersion unmanaged links.
We present the transmission of time domain hybrid QAM signals in order to maximize spectral efficiency according to link conditions. Single carrier (28 Gbaud) and superchannel (up to 1.15 Tb/s) transmission is demonstrated.
Advanced DSP algorithms for channel estimation and equalization, carrier phase recovery and nonlinearity mitigation for flexible transceivers are discussed for both single carrier and OFDM systems.
We derived an effective model to describe the plasmonic couplings between nanoparticles of general shape, and verified the model with full wave simulations.
Many existing trust management frameworks for Web services are built on the basic idea that the system maintains reputation or trust-level of the servers and users, and makes them available to other interested entities to make decisions on weather to engage in a transaction. In this case the quality of the reputation value depends on the quality of the feedback provided by transacting participants...
The objective is to propose a cost estimating method which is fitted to recent continuously producing industrial context evolution. In order to quote the steel product price and control cost before production, estimating steel product cost accurately is important for steel enterprise. After analyzing the existing cost estimation methods, steel product cost estimation was given based on steel product...
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