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Design and simulation of a tunable parity-time symmetric optoelectronic oscillator utilizing integrated components
Farnaz Ahmadfard1, S Esmail Hosseini2
1Department of Communications and Electronics, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran. f.ahmadfard@shirazu.ac.ir.
Scientific Reports
|July 11, 2024
Summary
This study demonstrates a novel optoelectronic oscillator (OEO) using integrated photonics and parity-time (PT) symmetry for single-frequency mode selection. This approach simplifies OEOs, reducing size and cost for broader applications.
Area of Science:
- Photonics
- Non-Hermitian systems
- Optoelectronics
Background:
- Non-Hermitian photonics leverage parity-time (PT) symmetry for mode selection in optical and microwave oscillations.
- Traditional optoelectronic oscillators (OEOs) use discrete components, leading to challenges in size, weight, power consumption, and cost.
- Achieving single-mode oscillation in OEOs typically requires narrowband microwave filters.
Purpose of the Study:
- To propose and demonstrate an integrated optoelectronic oscillator (OEO) that utilizes parity-time (PT) symmetry for single-frequency mode selection.
- To leverage integrated photonic components to overcome the limitations of traditional discrete OEO implementations.
- To eliminate the need for narrowband microwave filters by integrating PT-symmetry and high-Q-factor resonators.
Main Methods:
- Implementation of an OEO loop incorporating an integrated micro-ring resonator (MRR) acting as both modulator and resonator.
- Utilization of an adjustable integrated power splitter with a micro heater to balance gain and loss in coupled OEO loops.
- Integration of two photodiodes (PDs) for signal detection within the PT-symmetric framework.
Main Results:
- Successful single-frequency mode identification by combining PT-symmetry and an integrated high-Q-factor resonator.
- Demonstration of wide-range frequency tunability by adjusting the microwave photonic filter (MPF) center frequency.
- Achieved a generated microwave signal frequency of 11.5 GHz with measured phase noise of -76.5 dBc/Hz at a 10-kHz offset and a side mode suppression ratio (SMSR) of 40 dB.
Conclusions:
- The proposed integrated OEO design effectively achieves single-frequency mode selection using PT-symmetry and integrated components.
- This approach offers a compact, cost-effective, and versatile solution for microwave signal generation, obviating the need for external filters.
- The demonstrated performance highlights the potential of integrated non-Hermitian photonics for advanced OEO applications.
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