Open AccessTheoretical study of line narrowing in a sub‐terahertz monolithic dual laser source with an integrated reflector
Author(s) -
Yang Zhen,
Wonfor Adrian,
Penty Richard V.,
White Ian H.
Publication year - 2014
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2013.0070
Subject(s) - reflector (photography) , optics , terahertz radiation , laser , line (geometry) , materials science , transmission line , signal (programming language) , optoelectronics , semiconductor laser theory , computer science , physics , telecommunications , light source , geometry , mathematics , programming language
A monolithic design is proposed for low‐noise sub‐THz signal generation by integrating a reflector onto a dual laser source. The reflectivity and the position of such a reflector can be adjusted to obtain constructive feedback from the reflector to both lasers, thus causing a Vernier feedback effect. As a result, 10‐fold line narrowing, the narrowing being limited by the resolution of the simulation, is predicted using a transmission line model. Finally, a simple control scheme using an electrical feedback loop to adjust laser biases is proposed to maintain the line narrowing performance. This line narrowing technique, comprising a passive integrated reflector, could allow the development of a low‐cost, compact and energy‐efficient solution for high‐purity sub‐THz signal generation.