Filtered Multicarrier OFDM Encoding on Blue Laser Diode for 14.8-Gbps Seawater Transmission

A GaN blue laser diode (BLD)-based visible-light communication link is demonstrated in a seawater environment to provide 16-quadrature amplitude modulation orthogonal frequency-division multiplexing (QAM OFDM) data transmission at 14.8 Gbps over 1.7 m. Lengthening the seawater distance to 10.2 m onl...

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Bibliographic Details
Published in:Journal of lightwave technology 2018-05, Vol.36 (9), p.1739-1745
Main Authors: Huang, Yu-Fang, Tsai, Chen-Ting, Chi, Yu-Chieh, Huang, Ding-Wei, Lin, Gong-Ru
Format: Article
Language:English
Subjects:
Aliasing
Atmospheric and oceanic optics
Avalanche diodes
Background noise
Bandwidth
Bandwidths
Coding
Crosstalk
Data transmission
Diodes
Encoding
Filtration
Frequency division multiplexing
Gallium nitrides
GaN laser diodes
laser beam transmission
Lasers
Light emitting diodes
OFDM modulation
Optical communication
optical communications
Optical filters
Orthogonal Frequency Division Multiplexing
Oversampling
Peak to average power ratio
Quadrature amplitude modulation
Sampling
Seawater
Semiconductor lasers
Sidelobes
Signal to noise ratio
Subcarriers
visible laser or blue laser
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Summary:A GaN blue laser diode (BLD)-based visible-light communication link is demonstrated in a seawater environment to provide 16-quadrature amplitude modulation orthogonal frequency-division multiplexing (QAM OFDM) data transmission at 14.8 Gbps over 1.7 m. Lengthening the seawater distance to 10.2 m only decreases the transmission data rate by 4 Gbps, as caused by the frquency response limitation of the used avalanche photodiode. To optimize the QAM-OFDM transmission, the sampling rate of the encoded data is compromised to avoid the aliasing and oversampling effects during the waveform extraction procedure. The sampling rate is optimized to 3-5 times of the encoded data bandwidth for suppressing peak-to-average power ratio. Oversampling not only filters out background noise but also attenuates data amplitude to degrade transmission performance. Without using the multicarrier spectrally filtered OFDM, the 16-QAM OFDM data format only promotes the transmission capacity of BLD up to 7.6 Gbps in seawater. With spectrally filtering out the sidelobes of each OFDM subcarrier, the allowable modulation bandwidth is greatly improved from 1.9 to 2.7 GHz, as the intercarrier interference induced crosstalk between subbands is relieved to improve the SNR of the carried data with a raw data rate of up to 10.8 Gbps.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2017.2782840