کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Aperture-Radius Optimization of 1.3-µm QD-VCSELs Using Photonic-Crystal-Assisted Single-Mode Control

نویسندگان :

Sara Alaei¹ Gholamreza Babaabbasi² Saeed Olyaee³ Mahmood Seifouri⁴

1- Shahid Rajaee Teacher Training University 2- University of Lorestan 3- Shahid Rajaee Teacher Training University 4- Shahid Rajaee Teacher Training University

کلمات کلیدی :

QD-VCSEL،photonic crystal mirror،oxide aperture radius،single-mode operation،modulation bandwidth،thermal roll-over

چکیده :

We propose a self-consistent carrier–photon–thermal model combined with TMM/FDTD optical analysis to optimize the oxide-aperture radius of 1.3-µm PhC-assisted QD-VCSELs for robust single-mode operation. The photonic-crystal top mirror provides strong lateral loss discrimination, keeping the higher-order transverse mode below threshold while allowing larger apertures. By sweeping the oxide-aperture radius (4–8 µm) and bias current, we quantify the trade-off between output power, 3-dB modulation bandwidth, and thermal roll-over. The results show that increasing the aperture shifts the optimum bias toward higher currents and improves the combined power–speed merit, while reducing active-region heating and delaying thermal roll-over. These findings provide a simulation-driven guideline for selecting oxide-aperture radii that maximize power and speed without sacrificing single-mode purity in 1.3-µm QD-VCSELs.