1 Gbps free-space deep ultraviolet communications based on III-nitride micro-LEDs emitting at 262 nm

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He, Xiangyu and Xie, Enyuan and Islim, Mohamed Sufyan and Purwita, Ardimas Andi and McKendry, Jonathan J. D. and Gu, Erdan and Haas, Harald and Dawson, Martin D. (2019) 1 Gbps free-space deep ultraviolet communications based on III-nitride micro-LEDs emitting at 262 nm. Photonics Research, 7 (7). B41-B47. ISSN 2327-9125 (https://doi.org/10.1364/PRJ.7.000B41)

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Abstract

The low modulation bandwidth of deep-ultraviolet (UV) light sources is considered as the main reason limiting the data transmission rate of deep-UV communications. Here, we present high-bandwidth III-nitride microlight- emitting diodes (µLEDs) emitting in the UV-C region and their applications in deep-UV communication systems. The fabricated UV-C µLEDs with 566 µm2 emission area produce an optical power of 196 µW at the 3400 A/cm 2 current density. The measured 3 dB modulation bandwidth of these µLEDs initially increases linearly with the driving current density and then saturates as 438 MHz at a current density of 71 A/cm 2, which is limited by the cutoff frequency of the commercial avalanche photodiode used for the measurement. A deep-UV communication system is further demonstrated. By using the UV-C µLED, up to 800 Mbps and 1.1 Gbps data transmission rates at bit error ratio of 3.8 × 10-3 are achieved assuming on-off keying and orthogonal frequency-division multiplexing modulation schemes, respectively.

ORCID iDs

He, Xiangyu, Xie, Enyuan ORCID logoORCID: https://orcid.org/0000-0001-7776-8091, Islim, Mohamed Sufyan, Purwita, Ardimas Andi, McKendry, Jonathan J. D. ORCID logoORCID: https://orcid.org/0000-0002-6379-3955, Gu, Erdan ORCID logoORCID: https://orcid.org/0000-0002-7607-9902, Haas, Harald and Dawson, Martin D. ORCID logoORCID: https://orcid.org/0000-0002-6639-2989;
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