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We present a simple ultraviolet sub-nanosecond pulse generator using commercial ultraviolet light-emitting diodes with peak emission wavelengths of 290 nm, 318 nm, 338 nm, and 405 nm. The generator is based on step recovery diode, short-circuited transmission line, and current-shaping circuit. The narrowest pulses achieved have 630 ps full width at half maximum at repetition rate of 80 MHz. Optical pulse power in the range of several hundreds of microwatts depends on the applied bias voltage. The bias voltage dependences of the output optical pulse width and peak power are analysed and discussed. Compared to commercial UV sub-nanosecond generators, the proposed generator can produce much higher pulse repetition rate and peak power.

A high‐speed fiber optic transceiver using 650 nm resonant‐cavity light‐emitting diode (RC‐LED) and silicon pin photodiode for polymer optical fiber (POF) systems is presented. The transmitter exploits peaking and carrier sweep‐out effects to improve on‐off keying modulation rate of 100 MHz bandwidth RC‐LEDs by over 250%. An error‐free data transmission over 50 m graded‐index POF is demonstrated at 500 Mbit/s data rate. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:826–830, 2015

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