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

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

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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.