EML based on identical epitaxial layer, side-wall grating and HSQ planarization

Al-Moathin, A. et al. (2022) EML based on identical epitaxial layer, side-wall grating and HSQ planarization. IEEE Photonics Technology Letters, 34(6), pp. 317-320. (doi: 10.1109/LPT.2022.3155730)

Abstract

We present an electroabsorption modulated laser based on an identical epitaxial scheme, side-wall grating, on-chip microwave probe interface, and a new low-permittivity planarization method. The modulation speed is significantly increased by reducing the electrode capacitance by planarizing with a 5-μm-thick HSQ layer. Furthermore, implementing the electrode with a direct ground-signal-ground probe interface provides a straightforward interconnection that obviates the need for an external circuit and bonding wires. The device operates at 1565 nm wavelength with stable single-mode lasing, no mode-hopping, and a side mode suppression ratio above 35 dB. An extinction ratio of 19.5 dB was recorded at the maximum modulator bias of –4 V. The electrical to optical power response of the modulated signal at –3-dBo demonstrated a 19 GHz bandwidth at an extinction ratio of 7 dB, which supports error-free data transmission up to 27 Gbit/s.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Al-Taai, Dr Qusay and Watson, Dr Scott and Marsh, Professor John and Li, Professor Chong and Al-Moathin, Mr Ali and Tang, Song and Kelly, Professor Anthony and Hou, Dr Lianping and Di Gaetano, Dr Eugenio and Ye, Dr Shengwei
• Authors: Al-Moathin, A., Watson, S., Tang, S., Ye, S., Di Gaetano, E., Al-Taai, Q. R. A., Eddie, I., Huang, Y., Zhang, R., Li, C., Hou, L., Kelly, A., and Marsh, J. H.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Photonics Technology Letters
• Publisher: IEEE
• ISSN: 1041-1135
• ISSN (Online): 1941-0174
• Published Online: 02 March 2022
• Copyright Holders: Copyright © 2022 The Authors
• First Published: First published in IEEE Photonics Technology Letters 34(6): 317-320
• Publisher Policy: Reproduced under a Creative Commons License

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
172610		External engagement manager: CDT Photonic Integration for Advanced Data Storage	John Marsh	Engineering and Physical Sciences Research Council (EPSRC)	EP/L015323/1	ENG - Electronics & Nanoscale Engineering
302617		Optically controlled THz phased array antennas	John Marsh	Engineering and Physical Sciences Research Council (EPSRC)	EP/R042578/1	ENG - Electronics & Nanoscale Engineering