Polarization-multiplexed 2×2 phosphor-LED wireless light communication without using analog equalization and optical blue filter

Abstract We propose and experimentally demonstrate a 380 (2×190) Mbps phosphor-light-emitting-diode (LED) based visible light communication (VLC) system by using 2×2 polarization-multiplexing design for in-building access applications. To the best of our knowledge, this is the first time of employing polarization-multiplexing to achieve a high VLC transmission capacity by using phosphor-based white-LED without optical blue filter. Besides, utilizing the optimum resistor–inductor–capacity (RLC) bias-tee design, it can not only perform the function of combining the direct-current (DC) and the electrical data signal, but also act as a simple LED-Tx circuit. No optical blue filter and complicated post-equalization are required at the Rx. Here, the orthogonal-frequency-division-multiplexing (OFDM) quadrature-amplitude-modulation (QAM) with bit-loading is employed to enhance the transmission data rate.

[1]  Osamu Takyu,et al.  A High-Speed LED Driver That Sweeps Out the Remaining Carriers for Visible Light Communications , 2014, Journal of Lightwave Technology.

[2]  Changyuan Yu,et al.  Performance improvement by tilting receiver plane in M-QAM OFDM visible light communications. , 2011, Optics express.

[3]  Nan Chi,et al.  High-speed quasi-balanced detection OFDM in visible light communication. , 2013, Optics express.

[4]  Chi-Wai Chow,et al.  Investigation of 4-ASK modulation with digital filtering to increase 20 times of direct modulation speed of white-light LED visible light communication system , 2012 .

[5]  Jianjun Yu,et al.  Demonstration of 575-Mb/s downlink and 225-Mb/s uplink bi-directional SCM-WDM visible light communication using RGB LED and phosphor-based LED. , 2013, Optics express.

[6]  Chi-Wai Chow,et al.  Real-time white-light phosphor-LED visible light communication (VLC) with compact size. , 2013, Optics express.

[7]  Chia-Yi Chen,et al.  Bidirectional 16-QAM OFDM in-building network over SMF and free-space VLC transport. , 2013, Optics letters.

[8]  Chi-Wai Chow,et al.  Improved modulation speed of LED visible light communication system integrated to main electricity network , 2011 .

[9]  C. W. Chow,et al.  Background Optical Noises Circumvention in LED Optical Wireless Systems Using OFDM , 2013, IEEE Photonics Journal.

[10]  Y. Liu,et al.  Mitigation of Optical Background Noise in Light-Emitting Diode (LED) Optical Wireless Communication Systems , 2013, IEEE Photonics Journal.

[11]  Avner Safrani,et al.  Liquid-crystal polarization rotator and a tunable polarizer. , 2009, Optics letters.

[12]  Hai-Han Lu,et al.  Optical free-space wavelength-division-multiplexing transport system. , 2014, Optics letters.