Chaotic-cavity surface-emitting laser array for optical wireless communication and low-speckle illumination

Boon S. Ooi; Hang Lu; Omar Alkhazragi; Tien Khee Ng

doi:10.1117/12.3001492

8 March 2024 Chaotic-cavity surface-emitting laser array for optical wireless communication and low-speckle illumination

Boon S. Ooi, Hang Lu, Omar Alkhazragi, Tien Khee Ng

Author Affiliations +

Proceedings Volume 12890, Smart Photonic and Optoelectronic Integrated Circuits 2024; 128900E (2024) https://doi.org/10.1117/12.3001492
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

While highly coherent light has its advantages in certain applications, it also leads to some unwanted effects, such as the formation of speckles, negatively impacting imaging, lighting, and projection/display quality. This has prompted the development of edge-emitting semiconductor light sources with partial coherence, such as broadband lasers and superluminescent diodes (SLDs), which have found use in display applications, optical coherence tomography, and random bit generation. However, the edge-emission design of these sources complicates the fabrication of two-dimensional arrays, preventing their use in many applications. On the other hand, vertical-cavity surface-emitting lasers (VCSELs) have gained popularity in consumer electronics due to the unique benefits of surface emission. Yet, they face challenges related to high coherence. We demonstrate that by leveraging the distinctive properties of chaotic cavities, we can reduce the coherence of VCSELs without enlarging their emission area. This enables high-speed wireless communication with low-speckle illumination, as confirmed through comprehensive interference studies and high-speed testing. We show that the chaotic-cavity VCSELs can provide better illumination quality while maintaining high data rates (12.6 Gb/s over short distances and 6.5 Gb/s over 3 m). In addition, the use of a carefully designed AC signal for communication can further lower the speckle contrast, which improves the illumination performance. This paves the way for the potential use of chaotic-cavity VCSELs as versatile light sources for illumination, imaging, projection, communication, and various other applications.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Boon S. Ooi, Hang Lu, Omar Alkhazragi, and Tien Khee Ng "Chaotic-cavity surface-emitting laser array for optical wireless communication and low-speckle illumination", Proc. SPIE 12890, Smart Photonic and Optoelectronic Integrated Circuits 2024, 128900E (8 March 2024); https://doi.org/10.1117/12.3001492

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