Extracting coupling and loss coefficients from a ring resonator

Area of Science:

• Photonics and Optical Engineering
• Integrated Optics
• Resonator Devices

Background:

• Ring resonators are fundamental components in integrated photonics.
• Accurate characterization of coupling and loss coefficients is crucial for device design and performance optimization.
• Existing methods may require multiple resonators or complex setups.

Purpose of the Study:

• To develop a novel method for extracting optical coupling and loss coefficients from a single ring resonator.
• To provide a simplified approach for characterizing resonator performance.
• To enable disentanglement of coupling and loss parameters from resonance spectra.

Main Methods:

• Analysis of resonance peak widths, depths, and spacings within a single ring resonator.
• Application of derived formulas to extract characteristic coefficients.
• Investigation of the wavelength and device parameter dependence of the coefficients to distinguish between coupling and loss.

Main Results:

• Successfully extracted coupling and loss coefficients from single resonator spectra.
• Demonstrated a method to differentiate between coupling and loss coefficients.
• Validated the technique's reliance on spectral variations with wavelength or device parameters.

Conclusions:

• The developed method offers an efficient way to determine critical optical parameters of ring resonators.
• This technique simplifies the characterization process, requiring only a single resonator.
• Understanding the disentanglement based on spectral variations is key for accurate coefficient assignment.