Regrowth-free AlGaInAs MQW polarization controller integrated with sidewall grating DFB laser

Sun, X. et al. (2023) Regrowth-free AlGaInAs MQW polarization controller integrated with sidewall grating DFB laser. Photonics Research, 11(4), pp. 622-630. (doi: 10.1364/PRJ.480676)

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Polarization control is at the heart of high-capacity data optical communication systems, such as polarization-division multiplexers and Stokes vector modulation transmitters. Despite passive polarization control being mature, the realization of monolithically integrated polarization controllers and single longitudinal mode light sources, such as distributed-feedback (DFB) lasers, is of importance. In this research, we report an AlGaInAs multiple-quantum-well photonic integrated circuit device which can control the state of polarization of the output light source, consisting of a polarization mode converter (PMC), a differential phase shifter (DPS), and a sidewall grating DFB laser. We demonstrate an asymmetrical stepped-height ridge waveguide PMC to realize TE to TM polarization conversion and a symmetrical straight waveguide DPS to enable polarization rotation from approximately counterclockwise circular polarization to linear polarization. Based on the identical epitaxial layer scheme, all the PMC, DPS, and DFB lasers can be integrated monolithically using only a single step of metalorganic vapor-phase epitaxy and two steps of III-V material dry etching. For the DFB-PMC device, a high TE to TM polarization conversion efficiency (98.4%) over a wide range of DFB injection currents is reported at 1555 nm wavelength. For the DFB-PMC-DPS device, a nearly 60° rotation of the Stokes vector on the Poincaré sphere was obtained with a range of bias voltage from 0 to −3.0 V at a laser drive current of 170 mA.

Item Type:Articles
Additional Information:This work was supported by the U.K. Engineering and Physical Sciences Research Council (EP/R042578/1) and the Chinese Ministry of Education collaborative project (B17023).
Glasgow Author(s) Enlighten ID:Sun, Yiming and Liu, Professor Xuefeng and Hou, Dr Lianping and Cheng, Weiqing and Marsh, Professor John and Sun, Xiao and Ye, Dr Shengwei
Authors: Sun, X., Liang, S., Cheng, W., Ye, S., Sun, Y., Huang, Y., Zhang, R., Xiong, J., Liu, X., Marsh, J. H., and Hou, L.
College/School:College of Science and Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Photonics Research
Publisher:Optical Society of America
Published Online:30 March 2023
Copyright Holders:Copyright © 2023 Chinese Laser Press
First Published:First published in Photonics Research
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302617Optically controlled THz phased array antennasJohn MarshEngineering and Physical Sciences Research Council (EPSRC)EP/R042578/1ENG - Electronics & Nanoscale Engineering