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Sub-gigahertz bandwidth all-optical tunable differentiator with high-energy efficiency based on a micro-ring
Optics Letters
|March 1, 2024
Summary
We developed a tunable photonic differentiator for processing sub-gigahertz bandwidth pulses. This device achieves high energy efficiency using silicon photonics, outperforming previous methods for optical differentiation.
Area of Science:
- Photonics
- Optical Signal Processing
- Silicon Photonics
Background:
- Fractional-order differentiation is crucial for advanced optical signal processing.
- Existing methods often lack tunability or efficiency for sub-gigahertz bandwidth signals.
Purpose of the Study:
- To propose and demonstrate a tunable fractional-order photonic differentiator (DIFF).
- To achieve high energy efficiency in optical differentiation for sub-gigahertz bandwidth pulses.
Main Methods:
- Utilizing the self-induced optical modulation effect in a silicon-on-insulator micro-ring resonator.
- Employing Gaussian-like pulses with varying widths (7.5-20 ns) for differentiation.
- Conducting simulations for temporal dynamics and employing an all-optical pump-probe technique for order adjustment.
Main Results:
- Demonstrated a tunable photonic differentiator capable of processing sub-gigahertz bandwidth pulses.
- Achieved over 45% energy efficiency, surpassing previous schemes for this bandwidth.
- Successfully adjusted the differentiation order using an all-optical pump-probe technique.
Conclusions:
- The proposed tunable photonic differentiator offers a highly efficient solution for optical signal processing.
- Silicon-on-insulator micro-ring resonators are effective platforms for implementing advanced photonic functions.
- The developed method provides a pathway for flexible and efficient optical differentiation.
