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We report experimental results of Probabilistically Shaped 64QAM (PS-64QAM) Single-Carrier 400G transmission over SSMF, in a 50 GHz wavelength grid. Up to 300% reach enhancement over regular 64QAM is achieved, thanks to probabilistic shaping.
We propose a novel polarization recovery method and probabilistically shaped 64QAM-OFDM for Stokes-vector direct detection enabling high Baud rate and cost-effective short reach application. A single-λ 176-Gb/s signal was successfully received after 20km SMF transmission.
We propose an adaptive noise whitening filter to suppress the noise enhancement caused by linear equalizers in a band-limited channel. Its adaptivity and effectiveness with MLSE are experimentally verified with a strongly-filtered 40.7-GBd regular 8QAM signal.
We propose and experimentally demonstrate a 3.5-bits/symbol/polarization 12QAMo modulation format. This new format is shown to out-perform both 8QAM and 16QAM formats in 200G transmissions over 15×80 km of SSMF impaired by cascaded WSS filtering.
We propose a novel carrier-assisted dual-polarization (CA-DP) modulation system with Stokes vector direct detection (SV-DD). Results show that 192-Gb/s DP-16QAM-OFDM signal can be received after 160-km using the proposed scheme with BER below 7% HD-FEC.
56Gb/s ODB signal is generated using 28G silicon photonic modulator, demonstrating 12dB better sensitivity than 56Gb/s NRZ format. High tolerance to dispersion and MPI effects are verified by numerical simulation or experiment without pre/post equalization.
A new training method to determine perturbation coefficients for fiber nonlinearity mitigation is proposed and experimentally demonstrated. This method can deliver reliable coefficients for arbitrary pulse shapes, CD and power profiles without the full knowledge of system parameters.
We investigate performances of two digital methods for suppression of clock tone leakages of an 80GS/s high-speed DAC supporting single-carrier 400G. A novel clock leakage mitigation technique is experimentally demonstrated for the first time.
We present OpenFlow-enabled dynamic restoration in elastic optical networks, detailing the restoration framework and algorithm, failure isolation mechanism, OpenFlow protocol extensions, and quantitatively presenting the restoration performance via the experimental validation on the Global Environment for Network Innovations (GENI) testbed.
For 16QAM, we propose a QAM decomposition method enabling simple processing of perturbative nonlinearity mitigation. After 1920-km SSMF, our simple approach exhibits only ∼0.1-dB penalty compared with the complex conventional method and ∼0.5-dB gain over the degenerate method.
MMSE-based optimum quantization of the perturbation coefficients for the perturbative nonlinearity mitigation is proposed and experimentally demonstrated. Computational term reduction by a factor of 20 is realized in 2400km ULAF 16QAM transmission with <0.2dB Q degradation.
In this paper we review the prior works on DDO-OFDM systems, including the traditional DDO-OFDM that utilizes single band and single polarization, the multiband DDO-OFDM superchannel, and the dual-polarization (PDM) DDO-OFDM.
We propose a modified Walsh-Hadamard transform (MWHT) that reduces the PDL penalty by equalizing the performance of both polarization tributaries. The realization of MWHT requires just one piece of PMF and therefore exhibits a very low-cost PDL solution.
We propose a practically-implementable nonlinear noise cancellation (NLNC) method that effectively removes the “1st-order” fiber nonlinearities. After 6720-km (84×80-km) SSMF transmission, the signal performance in terms of Q-factor is improved by ∼1.4 dB with the proposed NLNC method.
We design and deploy an extended OpenFlow-based control plane for elastic optical networks with DDO-OFDM transmission, detailing the network architecture, the two-phase routing and spectrum assignment algorithm, OpenFlow protocol extensions and the experimental validation.
We present a node architecture and its control techniques for future terabit-class optical transport networks with the router offloading capability, which enables the cost-effectiveness and energy saving.
In this paper we numerically investigate the impacts of 1) pulse width, 2) pulse chirp, 3) power imbalance, and 4) timing offset, for a 16-QAM, 448-Gb/s signal that uses optical time-division-multiplexing and electronic time-division-demultiplexing (OMED) scheme.
Optical OFDM is a promising technology for highly spectrally efficient (SE) wavelength-division-multiplexing (WDM) system. Furthermore, the bit-rate 400 Gbit/s per WDM channel with SE of 8 bit/s/Hz is expected to be adopted for the next generation WDM system. For the application, optical OFDM is one of promising candidates because of the scalability for higher SE and higher bit-rate using multi-band...
In this paper we will review our recent works on DAC-free-generated 41-GBd PDM-64QAM (∼497 Gb/s) using one single I/Q modulator. Reaches from 720 to 1200 km on SSMF can be achieved by different receiving algorithms.
We have successfully demonstrated 3 × 458-Gbit/s Optical Multi-band OFDM transmission over 160 km of SSMF with EDFA-only amplification at 50 GHz WDM spacing by utilizing narrowband optical filter.
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