uah p 18020

Docket: UAH-P-18020


Phase modulation (PM) and frequency modulation (FM) ubiquitously exist in most electronic and optical signals. Precisely recognizing different modulation scenarios is important for analyzing complex signals. However, conventional methods of spectral analysis rely on direct measurement of power spectral density (PSD), which lacks the necessary specificity to differentiate certain modulation scenarios without ambiguity.

Using electronic frequency dividers (EFD), a common type of electronic component, researchers at UAH have developed an EFD-aided PSD measurement that allows for quantitative assessment of wideband frequency-modulation parameters, which is not possible with conventional spectral analysis. They also demonstrate a modified scheme aimed at improving the specificity in laser frequency analysis with the introduction of an EFD prior to the spectrum analyzer. Through monitoring spectral changes caused by the EFD, the proposed technique shows that common scenarios of PM and FM can be differentiated without ambiguity.

This enhanced spectral specificity of EFD-aided measurement benefits the field of frequency control by helping system designers more effectively identify potential fluctuation sources and their scales. It could also be applied in modulation recognition, radar technologies, laser frequency metrology, and microwave photonics. EFD-aided laser frequency analysis could aid in the development of laser frequency locking systems, radio frequency photonics, optical sending, and more.


  • Frequency metrology
  • Microwave photonics
  • Optical sensing
  • Radar technology
  • Modulation recognition


  • Quantitative assessment of wideband FM parameters


  • State of Development: Prototype
  • Licensing Status: Available for licensing
  • Patent Status: Proprietary