Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 31,
  • Issue 11,
  • pp. 1734-1743
  • (2013)

Optical Wireless Transmitter Employing Discrete Power Level Stepping

Not Accessible

Your library or personal account may give you access

Abstract

A major shortcoming of light-emitting diodes (LEDs) is their highly non-linear optical-power-versus-current characteristic. This non-linearity largely restricts the dynamic range and the transmission power of common optical wireless transmitters. This restriction degrades the performance of optical wireless communication (OWC) systems. In this paper, a novel transmitter concept for OWC is proposed which employs discrete power level stepping. The transmitter consists of several on-off-switchable emitter groups. These groups are individually controlled and emit fixed specific optical intensities in parallel. As optical intensities constructively add up, the total emitted intensity is generated by the sum of the emitted intensities of all activated emitter groups. Therefore, the proposed transmitter solution can generate several discrete optical intensity levels which can be used for optical wireless signal transmission. The transmitter design allows the utilisation of the full dynamic range of LEDs or laser diodes by avoiding non-linearity issues. Moreover, costs and complexity of the optical front-end are significantly reduced as neither a (DAC) nor high-speed current controllers are required. This simple design also provides improved power efficiency. Transmission experiments prove the functionality of the implemented optical transmitter. It is shown that the practical performance of the transmitter closely matches the expected performance determined by computer simulations. Moreover, the implemented optical transmitter is compared to an electrical transmission which provides ideal linearity characteristics, and therefore corresponds to an ideal conventional optical transceiver.

© 2013 IEEE

PDF Article
More Like This
CMOS-integrated GaN LED array for discrete power level stepping in visible light communications

Alexander D. Griffiths, Mohamed Sufyan Islim, Johannes Herrnsdorf, Jonathan J. D. McKendry, Robert Henderson, Harald Haas, Erdan Gu, and Martin D. Dawson
Opt. Express 25(8) A338-A345 (2017)

Unitary checkerboard precoded OFDM for low-PAPR optical wireless communications

Traian E. Abrudan, Stepan Kucera, and Holger Claussen
J. Opt. Commun. Netw. 14(4) 153-164 (2022)

On the Performance of Different OFDM Based Optical Wireless Communication Systems

Raed Mesleh, Hany Elgala, and Harald Haas
J. Opt. Commun. Netw. 3(8) 620-628 (2011)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved