CMOS integrated high speed light sensors for optical wireless communication applications

Nakhkoob, Behrooz; Ray, Sagar; Hella, Mona M.

doi:10.1109/icsens.2012.6411496

Cited by 2 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison, VLC receivers are much faster: able to achieve bandwidths of several GHz [5]. Furthermore, in dual-use VLC-lighting systems, lighting quality and energy-efficiency requirements can constrain VLC transmitters, reducing their individual throughput.…”

Section: Introductionmentioning

confidence: 99%

Scalable imaging VLC receivers with token-based pixel selection for spatial multiplexing

Chau

Little

2014

Proceedings of the 1st ACM MobiCom Workshop on Visible Light Communication Systems

View full text Add to dashboard Cite

Abstract-Visible light communications (VLC) can be adopted in lighting infrastructure to provide ubiquitous wireless access in spaces where light is consumed by humans. Unfortunately, the requirement to provide high-quality diffuse illumination reduces the potential capacity of the free space links and we seek ways to accommodate both the lighting and data rate goals. We investigate the combination of multiple VLC transmissions through spatial multiplexing (SM), a MIMO technique, to meet our data rate goals. Specifically, this paper deals with receiver designs intended to receive and decode increasing numbers of SM/MIMO VLC data streams.Conventional imaging (camera) sensors have been used as VLC receivers; however, they are intended to capture frames at relatively low speeds and their architectures do not translate well for receiving multiple high-rate VLC streams. Thus we consider new techniques to optimize imaging receivers to meet the capacity requirements of multiple SM streams.In this paper, we propose token-based pixel selection (TBPS) for CMOS image sensors as a scalable alternative to mitigate this decrease in sampling rate. We show that in many cases, TBPSbased image sensors sample transmissions several times more frequently than windowing image sensors, yielding higher VLC data rates. Assuming the same reset, integration, and read times, TBPS always performs as well as, and often better than, windowing.

show abstract

Section: Introductionmentioning

confidence: 99%

Scalable imaging VLC receivers with token-based pixel selection for spatial multiplexing

Chau

Little

2014

Proceedings of the 1st ACM MobiCom Workshop on Visible Light Communication Systems

View full text Add to dashboard Cite

show abstract

Large Active Area, Low Capacitance Multi-Dot PIN Photodiode in 0.35 m CMOS Technology

Poushi,

Goll,

Schneider-Hornstein

et al. 2024

IEEE Photonics J.

View full text Add to dashboard Cite

This paper presents a multi-dot PIN photodiode structure that addresses the inherent trade-off between the lightsensitive area and capacitance in conventional planar photodiodes commonly used in optical communication systems. This structure is a combination of several connected cathode dots and with a shared anode. The radial distribution of the electric field surrounding each cathode dot facilitates both vertical and peripheral charge collection, and accordingly, enables the region beneath and between the dots to function as a light-sensitive area with fast carrier drift. The key innovation of this work lies in the flexibility of the multi-dot structure for easy enlargement of the lightsensitive area by expanding the dot array, while still maintaining a small capacitance. Experimental results show that a 5 × 5 multi-dot PIN photodiode with a pitch of 20 µm corresponding to an active area of 100 µm × 100 µm achieves a capacitance of 48.8 fF, a responsivity of 0.294 A/W at a wavelength of 675 nm, and a bandwidth of 660 MHz at an operating voltage of 10 V. With a pitch of 15 µm that provides a light-sensitive area of 70 µm × 70 µm, the bandwidth increases to 930 MHz.

show abstract

CMOS integrated high speed light sensors for optical wireless communication applications

Cited by 2 publications

References 13 publications

Scalable imaging VLC receivers with token-based pixel selection for spatial multiplexing

Scalable imaging VLC receivers with token-based pixel selection for spatial multiplexing

Large Active Area, Low Capacitance Multi-Dot PIN Photodiode in 0.35 m CMOS Technology

Contact Info

Product

Resources

About