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We experimentally demonstrate a 260-meter security free-space optical data transmission link using orbital angular momentum (OAM) beams multiplexing and 16-ary quadrature amplitude modulation (16-QAM) signals. We study the beam wandering, power fluctuation, channel crosstalk, bit-error rate (BER) performance, and link security.
We design and fabricate a vertical hybrid SPP waveguide. The suitability of ultrahigh-bandwidth data transmission through the proposed waveguide by transmitting 1.8-Tbit/s (161 wavelength 11.2-Gbit/s) WDM OFDM 16-QAM is studied. The BERs of all 161 channels are less than 1e−3.
We present ultrahigh-speed transmission of 3.84-Tbit/s 64-QAM signal in Si ridge and Si slot waveguides. Si slot waveguide confining light in air slot region features reduced nonlinearity and resultant superior transmission performance with low penalty for varied input signal power from 1 to 250 mW.
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