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Publication . Article . Other literature type . 2020

32QAM WDM transmission at 12 Tbit/s using a quantum-dash mode-locked laser diode (QD-MLLD) with external-cavity feedback

Juned N. Kemal; Pablo Marin-Palomo; Kamel Merghem; Guy Aubin; Francois Lelarge; Abderrahim Ramdane; Sebastian Randel; +2 Authors
Open Access
English
Abstract

International audience; Chip-scale frequency comb generators lend themselves as multi-wavelength light sources in highly scalable wavelength-division multiplexing (WDM) transmitters and coherent receivers. Among different options, quantum-dash (QD) mode-locked laser diodes (MLLD) stand out due to their compactness and simple operation along with the ability to provide a flat and broadband comb spectrum with dozens of equally spaced optical tones. However, the devices suffer from strong phase noise, which impairs transmission performance of coherent links, in particular when higher-order modulation formats are to be used. Here we exploit coherent feedback from an external cavity to drastically reduce the phase noise of QD-MLLD tones, thereby greatly improving the transmission performance. In our experiments, we demonstrate 32QAM WDM transmission on 60 carriers derived from a single QD-MLLD, leading to an aggregate line rate (net data rate) of 12 Tbit/s (11.215 Tbit/s) at a net spectral efficiency (SE) of 7.5 bit/s/Hz. To the best of our knowledge, this is the first time that a QD-MLLD optical frequency comb has been used to transmit an optical 32QAM signal. Based on our experimental findings, we perform simulations that show that feedback-stabilized QD-MLLD should also support 64QAM transmission with a performance close to the theoretical optimum across a wide range of technically relevant symbol rates.

Subjects by Vocabulary

Microsoft Academic Graph classification: Spectral efficiency Frequency comb Transmission (telecommunications) Modulation Polarization-division multiplexing Physics Optics business.industry business Wavelength-division multiplexing Phase noise Laser diode law.invention law

Dewey Decimal Classification: ddc:600

Subjects

[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Atomic and Molecular Physics, and Optics, Technology, [SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic

Funded by
EC| TeraSHAPE
Project
TeraSHAPE
Terahertz Waveform Synthesis and Analysis Using Hybrid Photonic-Electronic Circuits
  • Funder: European Commission (EC)
  • Project Code: 773248
  • Funding stream: H2020 | ERC | ERC-COG
Validated by funder
,
EC| MICROCOMB
Project
MICROCOMB
Applications and Fundamentals of Microresonator Frequency Combs
  • Funder: European Commission (EC)
  • Project Code: 812818
  • Funding stream: H2020 | MSCA-ITN-ETN
Validated by funder
,
EC| TeraSlice
Project
TeraSlice
Terahertz Analogue-to-Digital Conversion Using Photonic Chipscale Soliton Frequency Combs and Massively Parallel Spectrally Sliced Detection
  • Funder: European Commission (EC)
  • Project Code: 863322
  • Funding stream: H2020 | RIA
Validated by funder
,
EC| BIG PIPES
Project
BIG PIPES
Broadband Integrated and Green Photonic Interconnects for High-Performance Computing and Enterprise Systems
  • Funder: European Commission (EC)
  • Project Code: 619591
  • Funding stream: FP7 | SP1 | ICT
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