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Motivated by the interest in using light-emitting diode (LED) for underwater optical communication, experiments with low transmitting power and high receiving sensitivity are conducted. On-off keying (OOK) modulation is employed, and 7.5 Mbps and 500 kbps bit rates are achieved with transmitting distances of 10 m and 50 m respectively. For 10 m transmitting distance experiment, the bandwidth limitation...
A novel scheme of optical analog-to-digital conversion system is proposed based on compressive sampling and the recent electrical modulated wideband converter. The proposed optical solution is more stable and implementable in practice. Because of the ultranarrow optical pulseswidth, the proposed solution can provide a uniform signal-to-noise attenuate of all frequency bins, compared to its electrical...
A novel phase-shifted optical analog-to-digital conversion proposal is presented and analyzed. Using an unbalanced MZM and specifically designed filter array, the desired phase shift between adjacent quantization channels can be realized. Comparing with existing schemes, the main advantage of this scheme is only one EOM and two wavelengths needed, regardless of the quantization resolution. Utilizing...
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