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Dual-wavelength DFB lasers based on continuous-phase-shift gratings for MMW/THz photomixing

Year: 2026

Type: article

Abstract: We demonstrate five dual-wavelength DFB lasers based on continuous-phase-shift gratings (CPSGs). The CPSG design preserves an effective coupling coefficient comparable to that of uniform Bragg gratings, while enabling deterministic control of the dual-mode spacing via a global phase ramp implemented in a single lithography step. Beat-note spacings ranging from 50 GHz to 1 THz are achieved, with dual‑mode operation exhibiting a side‑mode suppression ratio (SMSR) above 33 dB over a DFB drive current range exceeding 40 mA, albeit with increased threshold and reduced slope efficiency for the smallest 50 GHz spacing. These results establish CPSG-based dual-wavelength DFB lasers as compact optical beat sources for millimeter-wave/THz photomixing and heterodyne systems.

Source: Optics Letters

DOI: 10.1364/ol.593301

Authors: Zhefan Wang, Yiming Sun, Mohanad Al-Rubaiee, Ahmet Seckin Hezarfen, Yizhe Fan, Simeng Zhu, Bocheng Yuan, Weiwei Huang, Xiao Sun, John H. Marsh, Anthony Kelly, Lianping Hou

Language: English

Topic: Semiconductor Lasers and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Funders: University of Glasgow, Engineering and Physical Sciences Research Council

Award: Optically controlled THz phased array antennas

OpenAlex ID: W7155178198

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