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In this paper, we present an optical wireless communication system with cells linearly distributed along the railways continuously, which could provide seamless-access high speed data networks for passengers on the high speed railways (HSR). Using three different wavelengths, 10 Gb/s data rates networks access has been obtained in simulations.
We demonstrate W-band photonic transmitters-mixers, which are composed of near-ballistic-uni-traveling-carrier-photodiodes and quasi-Yagi antennas without integrating Si-lens. By utilizing it, data-transmission at W-band can be achieved under bias modulation of 1.25-Gb/s BPSK with 5GHz IF signals.
By integrating near-ballistic uni-traveling-carrier photodiodes with planar W-band bandpass filters, the demonstrated devices under optical local-oscillator and intermediate-frequency signals injection can exhibit high internal up-conversion-gain (14.2 dB) with a high output photocurrent (19 mA) at W-band (100 GHz).
We utilize the Zn-diffusion technique to fabricate a single-mode high-speed 850-nm vertical-cavity surface-emitting laser. With this technique, we are able to minimize the thermal effect without greatly scaling down the diameter of the oxide-confined aperture. The demonstrated device has a 9-mum active diameter with which we can attain a bandwidth of 8 GHz, a small differential resistance (~47 Omega),...
We demonstrate a high-speed green GaN light-emitting-diode for plastic optical fiber communication. By use of n-type doping in barrier layers, superior performance of modulation-speed and output-power to undoped control has been observed.
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