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Optoelectronic Oscillator Using Visible LEDs and Plastic Optical Fibers

Applied Optics

Vitor Ferreira, Vanessa Magri, Alexandre Santos, and Ricardo Ribeiro
received 10/02/2024; accepted 11/05/2024; posted 11/07/2024; Doc. ID 542580
Abstract: This Note describes an optoelectronic oscillator (OEO) capable of accepting CW light as input and providing radio-frequency (RF) carriers as output. To the best of our knowledge, we are the first describe an easy-to-assemble and low-cost OEO that uses visible LED sources with a standard 1 mm diameter plastic optical fiber as part of the oscillation ring. The gain is solely provided by a transimpedance pre-amplifier integrated with a photodetector. Self-oscillations occurred. Fundamental frequencies in the 7.7 - 26.5 MHz range was generated, since the length of the fiber and the bias current feeding the LED are both correctly tuned. A comprehensive approach is used to explain the operation of the OEO. The proposed OEO may be didactically useful for use in research or teaching laboratories by untrained people.