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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...
In visible light communications (VLCs) relying on intensity-modulation and direct detection (IM/DD), the conversion from electrical signals to optical signals and the limited dynamic range of the light-emitting diodes (LEDs) constitute the fundamental impediments in the way of high-integrity communications, especially when orthogonal frequency-division multiplexing (OFDM) is employed. In IM/DD VLCs,...
The impulse response and frequency response of indoor visible light communication diffuse channels are characterized experimentally in this paper. Both the short pulse technique and frequency sweep technique are adopted for experimental investigation. The iterative site-based modeling is also carried out to simulate the channel impulse response, and good conformity is observed between the experimental...
A novel balanced detection threshold scheme for all-optical analog-to-digital conversion is experimentally demonstrated. A 4-bit 10-GSamples/s all-optical analog-to-digital converter based on phase-shifted optical quantization and a balanced detection threshold scheme is realized to quantize a 9.9-GHz sinusoidal electrical signal, achieving a spur-free dynamic range of 24.2 dB. Compared with single-ended...
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