Wavelength referencing in single-mode microbend sensors

Area of Science:

• Optics and Photonics
• Materials Science
• Sensor Technology

Background:

• Microbending losses in optical fibers exhibit strong wavelength dependence.
• This phenomenon can be exploited for advanced sensor applications.
• Existing microbend sensors face challenges with fluctuations and accuracy.

Purpose of the Study:

• To utilize the wavelength dependence of microbending losses for fluctuation-free microbend sensing.
• To optimize this wavelength dependence through control of fiber parameters.
• To demonstrate a practical method for providing reference and signal wavelengths.

Main Methods:

• Investigated the wavelength dependence of microbending losses in single-mode optical fibers.
• Optimized fiber size and microbend periodicity to enhance wavelength dependence.
• Employed a light-emitting diode (LED) to provide reference and signal wavelengths.

Main Results:

• Demonstrated a strong wavelength dependence of microbending losses.
• Achieved significant optimization of this dependence by adjusting fiber size and microbend periodicity.
• Successfully utilized an LED spectrum for providing necessary wavelengths for sensing.

Conclusions:

• The wavelength dependence of microbending losses is a viable mechanism for fluctuation-free microbend sensing.
• Fiber parameters offer a powerful tool for optimizing sensor performance.
• LEDs provide a practical light source for implementing such sensors.