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Browsing by Author "Wu, Tsai-Chen"

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    Backscattering Effect of Phosphor Diffuser on the Blue Laser Diode Based 5.2-Gbps Li-Fi Communication Link
    (2016)
    Chi, Yu-Chieh
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    Wu, Tsai-Chen
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    Hsieh, Dan-Hua
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    Kuo, Hao-Chung
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    Lin, Gong-Ru
    A laser diode (LD) based Li-Fi transmitter using phosphor diffuser diverged 450-nm blue LD for white-lighting and 5.2-Gbit/s OFDM with EVM of 17.3%, SNR of 15.3 dB and FEC qualified BER of 3.1x10(-3) is demonstrated.
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    Impedance Matched GaN LD Package for Direct OFDM Communication at 14 Gbps
    (2016)
    Huang, Yu-Fang
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    Wu, Tsai-Chen
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    Chi, Yu-Chieh
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    Tsai, Cheng-Ting
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    Wang, Wei
    A transmission line aided impedance matching package for 450-nm GaN laser diode is employed to increase the directly encoded 16-QAM OFDM transmission up to 14-Gbps over 7 m in free-space after modulation throughput intensity optimization.
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    The Effect of Phosphor Concentration on Laser-Based White Light Communication System
    (2016)
    Hsieh, Dan-Hua
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    Wu, Tsai-Chen
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    Chi, Yu-Chieh
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    Chen, Yi-Rou
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    Huang, Chia-Yen
    Laser-based white light communication system with free-standing phosphor film is demonstrated, and the effect of phosphor concentration on white light quality and data quality is discussed to achieve the highest data rate of 6.8 Gbit/s.
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    Underwater 6.4-m Optical Wireless Communication with 8.8-Gbps Encoded 450-nm GaN Laser Diode
    (2016)
    Chi, Yu-Chieh
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    Wu, Tsai-Chen
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    Lin, Che-Yu
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    Lu, Hai-Han
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    Kuo, Hao-Chung
    6.4-m underwater optical wireless communication based on a GaN blue laser diode under direct 8.8-Gbps QAM-OFDM encoding is demonstrated with an average signal-to-noise ratio of 16 dB and a bit error rate of 3.8 x 10(-3).
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    Violet Laser Diode Enables Lighting Communication
    (2017-09-05)
    Chi, Yu-Chieh
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    Huang, Yu-Fang
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    Wu, Tsai-Chen
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    Tsai, Cheng-Ting
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    Chen, Li-Yin
    Violet laser diode (VLD) based white-light source with high color rendering index (CRI) for lighting communication is implemented by covering with Y3Al5O12:Ce3+ (YAG:Ce) or Lu3Al5O12:Ce3+/CaAlSiN3: Eu2+ (LuAG: Ce/CASN: Eu) phosphorous diffuser plates. After passing the beam of VLD biased at 70 mA (similar to 2I(th)) through the YAG: Ce phosphorous diffuser, a daylight with a correlated color temperature (CCT) of 5068 K and a CRI of 65 is acquired to provide a forward error correction (FEC) certified data rate of 4.4 Gbit/s. By using the VLD biased at 122 mA (similar to 3.5I(th)) to excite the LuAG: Ce/CASN: Eu phosphorous diffuser with 0.85-mm thickness, a warm white-light source with a CCT of 2700 K and a CRI of 87.9 is obtained at a cost of decreasing transmission capacity to 2.4 Gbit/s. Thinning the phosphor thickness to 0.75 mm effectively reduces the required bias current by 32 mA to achieve the same CCT for the delivered white light, which offers an enlarged CRI of 89.1 and an increased data rate of 4.4 Gbit/s. Further enlarging the bias current to 105 mA remains the white-light transmission capacity at 4.4 Gbit/s but reveals an increased CCT of 3023 K and an upgraded CRI of 91.5.