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We report on the potential of coded modulation to enable capacity transport optimization for short-reach interconnects. Using 2D-coded formats we demonstrate single wavelength 25Gb/s-granularity multi-rate transmission over distances ranging from 2 to 5 km.
We report on the non linear tolerance of multicarrier modulation versus the size of the WDM bandwidth. At high bandwidth efficiency, our results indicate that the gain of multicarrier is dependent on the WDM bandwidth.
We report on the use of 4-Dimension coded modulation for short-reach interfaces. With low extra complexity, 4D-coded PAM4 enables a performance improvement when associated with low-latency and low-complexity FEC, as demonstrated by experimental results.
We review single-carrier 400 Gb/s transponder design and experiments. Requirements in terms of opto-electronic devices, modulation formats, error correction codes to push the transmission reach beyond transatlantic distances are described.
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.
124 GBaud single-carrier based on 4-sub-band transmitter is compared experimentally with 4×30.25 GBaud super-channel solution. Using QPSK and 16QAM in a 125 GHz grid, we evaluate implementation penalties and performance in back-to-back and after long-haul transmission.
We report on the experimental comparison of the non linear tolerance of multicarrier and single-carrier modulations in WDM scenarios while varying the bandwidth efficiency. Non linear tolerance improvement of multicarrier approach decreases with bandwidth efficiency.
Using a transmitter based on sub-band synthesis, we generate and transmit over long-haul distance a record 1-Tb/s net data-rate single-carrier PDM-32QAM 124-GBd Nyquist-shaped signal with a spectral efficiency of 8 b/s/Hz.
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.
Based on recent Terabit-class transmission experiment, we discuss the design of 1Tb/s transceivers for long-haul optical systems involving complex tradeoffs between constellation complexity, opto-electronics bandwidth limitations, ROADM cascade, advanced FEC…
This paper will review the progresses in high capacity submarine transmission systems and the key technologies used to increase channel bit rate as well as fiber capacity.
We report on the non-linear performance comparison between two 8QAM modulation formats using Nyquist pulse shaping. Although less tolerant to phase noise and frequency detuning, we show that the Circular-8QAM format outperforms the Star-8QAM by 0.5 dB after transmission.
We report on transmission of 1Tb/s superchannel occupying 150 GHz bandwidth under constraints of legacy optical networks. Using standard 50-GHz grid WSS, we assess the impact of filtering stemming from add/drop nodes over a 1Tb/s superchannel with 6.7-bit/s/Hz spectral efficiency.
We report on a complex-valued MIMO 4×2 blind adaptive equalizer that can compensate for IQ skew of coherent optical receivers and is tolerant to accumulated chromatic dispersion. Excellent tolerance to skew between sampling channels is demonstrated using experimental data.
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.
A novel monolithic QPSK-ready transmitter source based on prefixed phase switching by fast EAMs has been realized on InP using a flexible photonic integrating circuit technology. It has been used up to 56Gb/s in DPSK coherent transmission experiments.
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 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.
A real-time FPGA-based receiver of 21Gb/s PS-QPSK signal is reported and tested against optical noise, chromatic dispersion (CD), polarization mode dispersion (PMD) and state of polarization (SOP) scrambling. A comparison with PDM-QPSK realized with equivalent parameterized setup and signal processing confirm the greater tolerance of PS-QPSK over PDM-QPSK.
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