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Dual optical frequency comb using a multi-functional PIC based on fully integrated injection locked gain-switched
Alejandro Rosado1,2, M Deseada Gutierrez-Pascual3, Gaurav Jain3
1Photonics Systems and Sensing Lab., School of Electronic Engineering, Dublin City University, Dublin, D09 V209, Ireland. alejandro.rosado@dcu.ie.
Scientific Reports
|December 26, 2025
Summary
This study presents a compact photonic integrated circuit (PIC) capable of generating a stable dual optical frequency comb (DOFC). This versatile device offers flexible configurations for advanced photonic sensing applications.
Area of Science:
- Photonics
- Integrated Optics
- Optical Frequency Combs
Background:
- Photonic integrated circuits (PICs) offer miniaturization potential for complex optical systems.
- Optical frequency combs (OFCs) are crucial for high-precision measurements and communications.
- Dual optical frequency combs (DOFCs) enable advanced sensing techniques like RF signal generation.
Purpose of the Study:
- To demonstrate a versatile PIC for dual optical frequency comb (DOFC) generation.
- To showcase the flexibility and compact nature of the integrated DOFC.
- To evaluate the performance of the generated RF comb for sensing applications.
Main Methods:
- Fabrication and characterization of a versatile PIC.
- Configuration of the PIC for DOFC generation with flexible free spectral ranges (FSRs).
- Heterodyning of two phase-correlated OFCs on a photodiode to generate an RF comb.
Main Results:
- The PIC successfully generated a DOFC with flexible FSRs using integrated components.
- The downconverted RF comb exhibited high amplitude stability (<0.4 dB fluctuations over 30 minutes).
- The RF-DOFC featured over 50 lines with a carrier-to-noise ratio (CNR) exceeding 20 dB.
Conclusions:
- The integrated PIC offers a compact and flexible platform for DOFC generation.
- The demonstrated DOFC exhibits excellent stability and performance characteristics.
- This technology holds significant potential for space-constrained photonic sensing applications.
