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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 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…
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.
The impact of channel multiplexing on system performance is investigated in case of high spectral efficiency systems emulation. Implications of band edge filtering, guard bands and passive coupler loss are studied.
We report the first wavelength-division-multiplexed transmission of 50-GHz-spaced single-carrier channels at 400Gb/s effective data-rate, achieving 8-b/s/Hz spectral efficiency. Twenty channels are sent over 600km with PDM-64QAM operating at 43Gbaud and received with cascaded blind equalization.
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.
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