Millimeter-wave generation based on four phase-shifted sampled Moiré grating dual-wavelength DFB laser

Fan, Y., Yuan, B., Al-Rubaiee, M., Sun, Y., Zhu, S., Akbar, J., Marsh, J. and Hou, L. (2024) Millimeter-wave generation based on four phase-shifted sampled Moiré grating dual-wavelength DFB laser. IEEE Photonics Technology Letters, 36(4), pp. 282-285. (doi: 10.1109/LPT.2024.3351531)

Abstract

We propose and demonstrate experimentally a dual-wavelength DFB laser based on a four phase-shifted sampled Moiré grating (4PS-SMG). By designing 4PS gratings with different sampling periods on each side of the ridge waveguide, an equivalent introduction of two π phase shifts within the cavity is achieved, enabling the device to exhibit dual-wavelength lasing. The sampling periods of the 4PS-SMG on each side of the ridge waveguide are 4668 nm and 4609 nm, respectively. The 59 nm difference in sampling periods can be realized with high quality through electron beam lithography (EBL). Additionally, the sidewall grating structure requires only one exposure to define both the ridge waveguide and the grating, avoiding issues related to misalignment between the grating and the ridge waveguide. When injecting current into the DFB laser within the 130 mA to 210 mA range, the device delivers exceptional dual-wavelength performance, featuring a power difference of less than 2 dB between the two primary modes. The device provides a high-quality radio frequency (RF) signal at 39.4 GHz, with a narrow linewidth of around 5.0 MHz.

• Item Type: Articles
• Additional Information: This work was supported by the U.K. Engineering and Physical Sciences Research Council (EP/R042578/1).
• Keywords: Millimeter-wave, dual-wavelength DFB laser, DFB semiconductor laser, sampled Moiré grating.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sun, Yiming and ZHU, Simeng and Marsh, Professor John and Akbar, Mr Jehan and Fan, Mr Yizhe and Hou, Dr Lianping and Al Rubaiee, Mohanad Jamal Abbas and Yuan, Mr Bocheng
• Authors: Fan, Y., Yuan, B., Al-Rubaiee, M., Sun, Y., Zhu, S., Akbar, J., Marsh, J., and Hou, L.
• College/School: College of Science and Engineering > School of Engineering; 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: 08 January 2024
• Copyright Holders: Copyright: © 2024 IEEE
• First Published: First published in IEEE Photonics Technology Letters 36(4): 282-285
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
302617		Optically controlled THz phased array antennas	John Marsh	Engineering and Physical Sciences Research Council (EPSRC)	EP/R042578/1	ENG - Electronics & Nanoscale Engineering