Optoelectronic oscillator using visible LEDs and plastic optical fibers

Area of Science:

• Optoelectronics
• Photonics
• RF Engineering

Background:

• Optoelectronic oscillators (OEOs) are crucial for generating radio-frequency (RF) carriers.
• Existing OEO designs can be complex and costly, limiting their accessibility.

Purpose of the Study:

• To describe a novel, low-cost, and easy-to-assemble optoelectronic oscillator (OEO).
• To demonstrate the generation of RF carriers using visible light sources and plastic optical fiber.

Main Methods:

• Utilized visible light-emitting diodes (LEDs) as the light source.
• Incorporated a standard 1 mm diameter plastic optical fiber within the oscillation ring.
• Employed a transimpedance pre-amplifier integrated with a photodetector for gain.
• Tuned fiber length and LED bias current to achieve self-oscillation.

Main Results:

• Successfully generated fundamental frequencies in the 7.7–26.5 MHz range.
• Achieved self-oscillation in the proposed OEO configuration.
• Demonstrated the feasibility of using low-cost components for OEO construction.

Conclusions:

• The developed OEO is a simple, cost-effective, and didactic tool.
• It is suitable for research and teaching laboratories, even for users with limited experience.
• This approach simplifies OEO construction without compromising functionality.