Patrick Brindel

Two mode transmission at 2x100Gb/s, over 40km-long prototype few-mode fiber, using LCOS-based programmable mode multiplexer and demultiplexer

We present a novel optical transmission system to experimentally demonstrate the possibility of mode division multiplexing. Its key components are mode multiplexer and demultiplexer based on a programmable liquid crystal on silicon panel, a prototype few-mode fiber, and a 4×4 multiple input multiple output algorithm processing the information of two polarization diversity coherent receivers. Using this system, we transmit two 100 Gb/s PDM-QPSK data streams modulated on two different modes of the prototype few-mode fiber. After 40 km, we obtain Q(2)-factors about 1 dB above the limit for forward error correction.

Mode-Division Multiplexing of 2

We demonstrate one of the first experiments of optical transmission based on mode-division multiplexing over a few-mode optical fiber. The mode multiplexer and demultiplexer are based on a programmable liquid crystal on silicon panel. Using this system, we transmit two 100 Gb/s polarization division multiplexed quaternary phase-shift keying data streams modulated on two different modes of the prototype few-mode fiber. At the receiver, a set of optical coherent detectors with DSP including multiple-input multiple-output algorithms recover the signal and permit to mitigate the crosstalk stemming from imperfect mode conversion.

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We transmit two 100Gb/s PDM-QPSK data streams over two different modes of a 40km-long prototype few-mode fiber. Our experiment is performed with an LCOS-based mode multiplexer/demultiplexer and 4×4 MIMO algorithm in a coherent receiver.

100 Gb/s Channels Using an LCOS-Based Spatial Modulator

We demonstrated 40 Gbit/s optical link by coupling a silicon (Si) optical modulator to a germanium (Ge) photo-detector from two separate photonic chips. The optical modulator was based on carrier depletion in a pn diode integrated in a 950-µm long Mach-Zehnder interferometer. The Ge photo-detector was a lateral pin diode butt coupled to a silicon waveguide. The overall loss, which is mainly due to coupling (3 grating couplers times ~4 dB) was estimated to be lower than 18 dB. That also included modulator loss (4.9-dB) and propagation loss (<1 dB/cm). Both optoelectronic devices have been fabricated on a 300-mm CMOS platform to address high volume production markets.

Transmission at 2×100Gb/s, over two modes of 40km-long prototype few-mode fiber, using LCOS-based mode multiplexer and demultiplexer

We demonstrate 52.9Tb/s transmission over transoceanic distances thanks to spectrum shaped PDM 16QAM modulation, nonlinear mitigation, C and L band amplification and adaptive multi FECs with optimized code rates to maximize the total capacity.

A 40 Gbit/s optical link on a 300-mm silicon platform

We demonstrate a single carrier modulated 400-Gb/s transceiver, leveraging an optimization procedure of inter-symbol interference mitigation and forward error correction. We validate its design by transporting five channels over 6600-km with 6-bit/s/Hz spectral efficiency.

52.9 Tb/s transmission over transoceanic distances using adaptive multi-rate FEC

We study, for the first time, the impact of applying multiple forward error correction codes (FEC) with rates adapted to channel performance fluctuations of a wavelength-division-multiplexed C+L-band PDM-16QAM transmission system over transoceanic distances, with EDFA-only amplification. The extra capacity, due to adaptive multirate FEC, as a function of system reach is quantified, both with and without digital postcompensation of nonlinearity.

Optimized spectrally efficient transceiver for 400-Gb/s single carrier transport

Since the advent of wavelength division multiplexed optical systems, increasing the bit rate per optical carrier has proved to be the most effective method to drive the overall cost of optical systems down. However, multicarrier approaches have gained momentum for 400-Gb/s transport to cope with bandwidth limitations of optoelectronic components. In this paper, single carrier modulated 400-Gb/s transport over transatlantic distances is demonstrated for the first time. Using high-speed digital-to-analog converters, we successfully generated a 64 GBaud dual-polarization signal modulated using 16-ary quadrature amplitude modulation. Thanks to Nyquist pulse shaping, our channels are closely packed with 66.7 and 75 GHz channel spacing, resulting on 6 and 5.33-bit/s/Hz of spectral efficiencies, respectively. Transceiver design is based on an optimization procedure of inter-symbol interference mitigation and forward error correction overhead. A spatially-coupled low density parity check code with decoder-aware degree optimization is used to reduce the gap to capacity. We validated our transceiver design by transporting five channels over 6600 and 7200-km with 6 and 5.33-bit/s/Hz of spectral efficiency, respectively. We analyze as well the performance gain provided by non-linear mitigation using filtered digital back-propagation algorithm.

Transoceanic Transmission Systems Using Adaptive Multirate FECs

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.

Spectrally-Efficient 400-Gb/s Single Carrier Transport Over 7 200 km

We report on a full C + L-band erbium-doped fiber amplified (EDFA) submarine transmission experiment of 178 wavelength-division multiplexed channels of 49-GBd polarization multiplexed 16QAM signals, achieving 54.2 Tb/s after 6600 km, with a record per-channel average net bit rate of 304.5 Gb/s. Digital backpropagation and time-domain perturbative nonlinearity compensation were alternatively applied to all channels and their respective benefits, in terms of throughput increase, reach increase, and complexity, were addressed. Multiple-rate spatially coupled low density parity check forward error correction codes with a novel rate optimization algorithm were employed. The power consumption of the power feeding equipment of our EDFA-only amplification scheme was analyzed and compared with that of hybrid EDFA Raman amplification. We also provided numerical and theoretical performance analysis of nonlinear uncompensated/compensated systems.