Chromatic dispersion characterization by direct instantaneous frequency measurement

Area of Science:

• Optics and Photonics
• Optical Metrology

Background:

• Chromatic dispersion is a critical parameter in optical systems.
• Accurate measurement of dispersion is essential for optical communication and instrumentation.

Purpose of the Study:

• To present a new concept for measuring chromatic dispersion.
• To enable direct group delay measurement using optical pulse analysis.

Main Methods:

• Utilizes temporal and spectral interferometry to obtain instantaneous frequency.
• Analyzes the frequency shift of a short optical pulse after device propagation.
• Employs temporal and spectral fringe encoding for enhanced accuracy.

Main Results:

• Directly obtains group delay from the instantaneous frequency.
• Demonstrates excellent accuracy and noise resistance.
• Successfully characterizes a wide range of dispersions, even with high insertion losses.

Conclusions:

• The proposed method offers a robust and accurate approach to chromatic dispersion measurement.
• It is suitable for characterizing diverse optical devices and challenging conditions.