High speed characterization of 1D-addressable multi-channel VCSELs with SPAD arrays for automotive LIDAR

Hemashilpa Kalagara; Ben Kesler; Eric Hegblom; Preethi Dacha; Matthew Peters; Guowei Zhao; Jun Yang; Daniel Shi; Kevin Yu

doi:10.1117/12.3015301

13 March 2024 High speed characterization of 1D-addressable multi-channel VCSELs with SPAD arrays for automotive LIDAR

Hemashilpa Kalagara, Ben Kesler, Eric Hegblom, Preethi Dacha, Matthew Peters, Guowei Zhao, Jun Yang, Daniel Shi, Kevin Yu

Author Affiliations +

Proceedings Volume 12904, Vertical-Cavity Surface-Emitting Lasers XXVIII; 129040G (2024) https://doi.org/10.1117/12.3015301
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

LUMENTUM’s multi-channel VCSELs in combination with SPAD (Single photon avalanche photodiode) receivers can perform “true” solid-state scanning in a single direction. The multi-channel VCSEL along with collimating lens and a horizontal diffuser can be matched with SPAD arrays of different sizes and aspect ratios. In this paper, we show the characterization results of the multi-channel VCSEL with 57 channels and 7J epi architecture, at 5ns pulse width, 0.1% duty cycle from temperature range of -40°C to 125°C. The L-I tests at 25°C yield a threshold current of 0.57A, optical power of 140W, and slope efficiency of 7.21W/A at 20A. The optical power, slope efficiency decreased by only 20% from -40°C to 125°C. The FF divergence at 25°C is about 25° and varies by 1.9° from -40°C to 125°C. The leakage current between different anodes/channels at 85ºC is only 0.27μA for a voltage difference of 50V between the channels. We continue to develop higher current drivers to characterize the VCSELs at higher currents. The next generation VCSELs will have higher junction-count epi, allowing for even higher power and slope efficiency. This scheme of addressable high speed and high power VCSELs tailored for operation with SPAD arrays is a very crucial step towards building allelectronic scanning automotive grade LIDARs.

Conference Presentation

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

Citation Download Citation

Hemashilpa Kalagara, Ben Kesler, Eric Hegblom, Preethi Dacha, Matthew Peters, Guowei Zhao, Jun Yang, Daniel Shi, and Kevin Yu "High speed characterization of 1D-addressable multi-channel VCSELs with SPAD arrays for automotive LIDAR", Proc. SPIE 12904, Vertical-Cavity Surface-Emitting Lasers XXVIII, 129040G (13 March 2024); https://doi.org/10.1117/12.3015301

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