Abstract
Optical blue filter is usually regarded as a critical optical component for high speed phosphor-based white light emitting diode (LED) visible-light-communication (VLC). However, the optical blue filter plays different roles in VLC when using modulations of on-off keying (OOK) or discrete multi-tone (DMT). We show that in the DMT VLC system, the blue optical filter may be unnecessary, and even degrade the transmission performance (by reducing the optical signal-to-noise ratio (SNR)). Analyses and verifications by experiments are performed. To the best of our knowledge, this is the first time the function of blue filters in VLC is explicitly analyzed.
Highlights
Prosperous development of light emitting diode (LED) technology makes LED an economical choice of light source
When this phosphor-based LED is used for the visible light communication (VLC), the modulation bandwidth is limited by the long relaxation time of the phosphor; limiting the transmission capacity of the VLC
Optical blue filter is usually regarded as a critical optical component for high speed phosphorbased white LED VLC
Summary
Prosperous development of light emitting diode (LED) technology makes LED an economical choice of light source. In order to increase the LED modulation bandwidth, it is claimed to use a blue filter before the photo-diode (PD) in the VLC system to eliminate the slow-response yellow light component [8,9,10]. Using high spectral-efficient modulation formats is one common approach to mitigate the bandwidth starvation issue of LED VLC systems Among these spectral-efficient modulation formats, discrete multi-tone (DMT) is a popular choice since adaptive bit-loading and simple equalization can be used to highly utilize the available bandwidth of the LED; higher capacity and acceptable bit error rate (BER) can be obtained [10,11,12]. To the best of our knowledge, this is the first time the function of blue filter in VLC is explicitly analyzed
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