Abstract
Schemes for high bit rate transmission of fibre-optic signal using LEDS with bipolar pulsing and duo-binary signalling have been discussed. The reverse pulsing together with preshaping of driving pulses has been found to increase the LED modulation bandwidth by a factor of four while with duo-binary signalling the bit-rate can be increased by a factor of two with 4–5 dB power penalty. A combination of the two techniques can thus lead to significant improvement in the bit-rate of transmission.
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