The modulation bandwidth of a light-emitting diode is inversely proportional to the carrier lifetime, which changes with varying injected current. However, in conventional implementations of visible light communications, the influence of bias current is always emphasized, while the effects of modulation indices and signal components are ignored. In this Letter, it is the first time, to the best of our knowledge, that the mechanism on how modulated signal components impact modulation bandwidth is clarified. We reveal and interpret this impact by featuring the response at different modulation indices and intensity distributions mathematically and experimentally, proposing a series of theoretical approaches for the insight of modulation at a high index. This Letter donates a novel perspective on deciding appropriate configurations for modulators according to the modulation characteristics at a high index of the input signal.
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| http://dx.doi.org/10.1364/OL.43.004570 | DOI Listing |
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