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Photonics 2015, 2(2), 527-539; doi:10.3390/photonics2020527

Multi-Format Wavelength Conversion Using Quantum Dash Mode-Locked Laser Pumps

Department of Electrical and Computer Engineering, Center for Optics, Photonics and Lasers, Université Laval, Québec G1S 3A8, QC, Canada
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Received: 21 March 2015 / Accepted: 30 April 2015 / Published: 14 May 2015
(This article belongs to the Special Issue Nonlinear Fiber Optics)
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Abstract

We investigate and compare the performance of wavelength conversion for two different non-return-to-zero (NRZ) modulation formats at 40 Gb/s: on off keying (OOK) and differential phase-shift keying (DPSK). To achieve wide wavelength coverage and integrability, we use a dual pump scheme exploiting four-wave mixing in semiconductor optical amplifiers. For phase stability, we use a quantum-dash mode-locked laser (QD-MLL) as a multi-wavelength source for the dual pumps, with tunability provided by the output filter. The significant sidelobes of the DPSK spectrum (relative to OOK) require the balancing of the pump proximity to the original signal (facilitating high conversion efficiency) with the signal degradation from the pump spectrum overlapping the converted DPSK signal. We achieve a conversion efficiency near –3.6 dB for OOK and –5.4 dB for DPSK across a 12 nm tuning range with low input powers (1 dBm). We measure bit error rate (BER) and obtain error free transmission (BER < 109) with a power penalty less than 2 dB for OOK and 3 dB for DPSK. View Full-Text
Keywords: four wave mixing (FWM); mode-locked lasers; optical networks; packet switching; quantum-dash mode-locked laser (QD-MLL); wavelength converter four wave mixing (FWM); mode-locked lasers; optical networks; packet switching; quantum-dash mode-locked laser (QD-MLL); wavelength converter
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

M’Sallem, Y.B.; Park, C.S.; LaRochelle, S.; Rusch, L.A. Multi-Format Wavelength Conversion Using Quantum Dash Mode-Locked Laser Pumps. Photonics 2015, 2, 527-539.

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