Mode-locked laser diodes and their monolithic integration

Marsh, J. H. and Hou, L. (2017) Mode-locked laser diodes and their monolithic integration. IEEE Journal of Selected Topics in Quantum Electronics, 23(6), 1100611. (doi: 10.1109/JSTQE.2017.2693020)

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We describe mode locked laser diodes (MLLDs) operating from 40 GHz to >1 THz. Below 40 GHz, operation at the fundamental cavity frequency is appropriate, but at higher frequencies harmonic mode-locking (HML) is used. To increase output power and control nonlinear behavior, the gain needs to be modified, and an AlGaInAs/InP structure with a three-quantum-well active layer and passive far-field reduction layer is presented. In 40-GHz all-active MLLDs, this structure offers improvements in internal loss, slope efficiency, mode locking (ML) range, RF linewidth, timing jitter, far field pattern, and coupling efficiency to a single-mode fiber. By creating a transparent passive waveguide in part of the cavity, a 490-fs pulse width was achieved, the shortest reported from any quantum well MLLD. Several approaches are described for HML: colliding pulse ML operating up to 240 GHz, coupled cavity ML up to 160 GHz, and sampled Bragg grating constructions up to 1.28 THz. This latter approach offers stable HML over a wide range of bias conditions. Finally, we report a synchronized multicolor ML laser array, containing four 40-GHz lasers with designated wavelength registration for optical code division multiple access or optical time division multiple access applications.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Marsh, Professor John and Hou, Dr Lianping
Authors: Marsh, J. H., and Hou, L.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Journal of Selected Topics in Quantum Electronics
ISSN (Online):1558-4542
Published Online:12 April 2017
Copyright Holders:Copyright © 2017 IEEE
First Published:First published in IEEE Journal of Selected Topics in Quantum Electronics 23(6):1100611
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
453111High power, high frequency mode-locked semiconductor lasersAnn BryceEngineering & Physical Sciences Research Council (EPSRC)EP/E065112/1ENG - ENGINEERING ELECTRONICS & NANO ENG