標題: 450-nm GaN laser diode enables high-speed visible light communication with 9-Gbps QAM-OFDM
作者: Chi, Yu-Chieh
Hsieh, Dan-Hua
Tsai, Cheng-Ting
Chen, Hsiang-Yu
Kuo, Hao-Chung
Lin, Gong-Ru
光電工程學系
Department of Photonics
公開日期: 18-May-2015
摘要: A TO-38-can packaged Gallium nitride (GaN) blue laser diode (LD) based free-space visible light communication (VLC) with 64-quadrature amplitude modulation (QAM) and 32-subcarrier orthogonal frequency division multiplexing (OFDM) transmission at 9 Gbps is preliminarily demonstrated over a 5-m free-space link. The 3-dB analog modulation bandwidth of the TO-38-can packaged GaN blue LD biased at 65 mA and controlled at 25 degrees C is only 900 MHz, which can be extended to 1.5 GHz for OFDM encoding after throughput intensity optimization. When delivering the 4-Gbps 16-QAM OFDM data within 1-GHz bandwidth, the error vector magnitude (EVM), signal-to-noise ratio (SNR) and bit-error-rate (BER) of the received data are observed as 8.4%, 22.4 dB and 3.5 x 10(-8), respectively. By increasing the encoded bandwidth to 1.5 GHz, the TO-38-can packaged GaN blue LD enlarges its transmission capacity to 6 Gbps but degrades its transmitted BER to 1.7 x 10(-3). The same transmission capacity of 6 Gbps can also be achieved with a BER of 1 x 10(-6) by encoding 64-QAM OFDM data within 1-GHz bandwidth. Using the 1.5-GHz full bandwidth of the TO-38-can packaged GaN blue LD provides the 64-QAM OFDM transmission up to 9 Gbps, which successfully delivers data with an EVM of 5.1%, an SNR of 22 dB and a BER of 3.6 x 10(-3) passed the forward error correction (FEC) criterion. (C) 2015 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.23.013051
http://hdl.handle.net/11536/124806
ISSN: 1094-4087
DOI: 10.1364/OE.23.013051
期刊: OPTICS EXPRESS
Volume: 23
Issue: 10
起始頁: 13051
結束頁: 13059
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