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We demonstrate a single-polarization driver-free, direct-detection 56-GBaud PAM-8 transceiver enabled by a high-speed selector power DAC fabricated in InP DHBT, and successfully transmit 168 Gbit/s line-rate over 2 km distance without optical amplification.
We experimentally evaluate performances of QPSK, 8- and 16-QAM signals after traversing a long cascade of up to 50 SOAs and assess system design rules for an optical packet-switched SOA-based network.
We synthesize a single-carrier optical signal at a record 1-Tb/s line-rate, out of multiple spectral slices by joint optical and digital signal processing. The 127.9-GBd signal is successfully transmitted and detected after 3,000km distance.
We propose a novel algorithm mitigating cross-polarization modulation based on a joint blind channel estimation and symbol detection. Using Nyquist pulse shaping and PDM-QPSK modulation, experiments are in accordance with simulations and show up to 0.7dB improvement in Q-factor.
Accounting for tight filtering impairments, we show why the ideal extra capacity of 33% brought by 37.5GHz channel spacing (compared to 50GHz) may be significantly reduced under physical constraints of fully transparent meshed networks.
We study the performance of multicarrier offset modulation and root-raised-cosine shaped multicarrier modulation with aggregate 32.5 GBd symbol rate and show that offset modulation is preferable for non-zero rolloff factors.
We present a transmission experiment over transoceanic distance using multi-level modulation format and an error correcting code optimized for 200 Gb/s channel rate. A record capacity is obtained using 155 channels over C+L bands.
We evaluate the benefits and limitations of semi-conductor optical amplifiers (SOAs) and reflective SOAs, when used as logic gates in a 10 Gbit/s per wavelength WDM packet-switched network. We compare three components with different internal structures and provide estimation of the maximum number of cascaded packet-blocker-based nodes.
We present a numerical investigation for the use of semiconductor optical amplifiers (SOA) as broadband amplifiers in a context of quasi-Nyquist WDM long-haul transmission using PDM-QPSK, 8-QAM and 16-QAM modulation formats. The SOAs nonlinear behavior is assessed for each format considering different numbers of channels and cumulative dispersion.
We studied the system benefits of applying dispersion pre-compensation using programmable DAC, on the performance of 32.5 Gbaud root-raised-cosine pulse-shaped PDM-WDM BPSK, QPSK, and 16QAM. With 50% dispersion pre-compensation, for BPSK 1.5 dB improvemement of optimum Q2-factor is observed while for QPSK and 16QAM no improvement was observed.
We propose to use decision feedback equalization (DFE) for ISI mitigation on 28Gbaud PDM-8QAM bandwidth-constrained Nyquist WDM. We compare DFE and maximum a posteriori (MAP) detection and show that DFE offers a more interesting performance/complexity trade-off than MAP.
We study the impact of tight optical filtering on the performance of 28 GBaud Nyquist WDM PDM-8QAM. Performance degradation and its mitigation using maximum-a-posteriori (MAP) detection are investigated. System sensitivity to laser frequency detuning, and Gaussianity of statistics are studied as well.
We study experimentally PDM-QPSK, PDM-8QAM and PDM-16QAM signals with Nyquist pulse-shaping at 28 Gbaud for undersea transmissions. We compare their noise sensitivity, nonlinear tolerance, transmission reach and assess their performance depending on channel spacing.
We report the experimental transmission of 4-D coded modulation formats based on set-partitioning of two 16QAM 2-D constellations. Using Nyquist-pulse-shaping, 32SP-DP-16QAM and 128SP-DP-16QAM signals are transmitted over long-haul distance and compared with PDM-16QAM.
We experimentally demonstrate the performance of a computationally efficient digital filter back-propagation scheme for post-compensating SOA nonlinearities in coherent detection of 16-QAM signal at 16 Gbaud, and compare the results with simulations.
We propose a concept of flexible PON and show with experiments and network dimensioning how burst-mode, software-defined coherent transponders can more than double the average capacity per user in TDMA access networks.
We report on the long-haul transmission of 1-Tb/s superchannels using PDM-16QAM modulation and Nyquist pulse shaping. Based on flexible grid wavelength selective switch technology, we transmit three 1-Tb/s superchannels spaced by 175-GHz over 1600 km of SSMF and four ROADM, with a spectral efficiency of 5.7 bit/s/Hz.
We report on the performance comparison between two modulation formats carrying each 2.5 bits per transmitted 2D-symbol. Using Nyquist pulse shaping and a 33-GHz spacing grid, we show that the 4D-32SP-16QAM format outperforms the Hybrid-QPSK/8QAM format over a transmission link made of standard single mode fiber.
We propose a novel blind feed-forward compensator of cross-polarization modulation for PDM-QPSK signals. Simulations show an improvement of 1 dB in Q-factor in a 112Gbit/s 2000km SMF dispersion-managed link.
Thanks to simulations, we discuss the choice of the optimal rolloff in realistic Nyquist-WDM systems, while accounting for transmitter/receiver impairments, namely the finite impulse response length of root-raised-cosine pulse shapes, jitter and vertical DAC/ADC resolution.
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