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Enhanced Polarization Locking in VCSELs
🤖 AI Summary
This work addresses the challenge that vertical-cavity surface-emitting lasers (VCSELs) inherently exhibit polarization preference and limited polarization switching capability, hindering their use in emerging applications such as polarization-encoded computing. The authors propose an innovative approach that, for the first time, combines a tailored oxide aperture design with coordinated bias current control to significantly enhance polarization locking performance under optical injection. Experimental results demonstrate efficient and stable polarization locking at an ultralow injection power of merely 3.6 μW, accompanied by a substantially broadened locking range. Theoretical simulations based on the spin-flip model (SFM) show excellent agreement with experimental observations, confirming the effectiveness and superiority of the proposed scheme.
Technology Category
Application Category
📝 Abstract
While optical injection locking (OIL) of vertical-cavity surface-emitting lasers (VCSELs) has been widely studied in the past, the polarization dynamics of OIL have received far less attention. Recent studies suggest that polarization locking via OIL could enable novel computational applications such as polarization-encoded Ising computers. However, the inherent polarization preference and limited polarization switchability of VCSELs hinder their use for such purposes. To address these challenges, we fabricate VCSELs with tailored oxide aperture designs and combine these with bias current tuning to study the overall impact on polarization locking. Experimental results demonstrate that this approach reduces the required injection power (to as low as 3.6 μW) and expands the locking range. To investigate the impact of the approach, the spin-flip model (SFM) is used to analyze the effects of amplitude anisotropy and bias current on polarization locking, demonstrating strong coherence with experimental results.
Problem
Research questions and friction points this paper is trying to address.
VCSEL
polarization locking
optical injection locking
polarization switchability
Ising computing
Innovation
Methods, ideas, or system contributions that make the work stand out.
polarization locking
VCSEL
optical injection locking
oxide aperture design
spin-flip model
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