Thermally-efficient reconfigurable narrowband RF-photonic filter

Area of Science:

• Photonics
• Electrical Engineering
• Materials Science

Background:

• Radio-frequency (RF)-photonic filters are crucial for modern communication systems.
• Reconfigurable filters offer flexibility but often require significant power for tuning.
• Existing silicon-on-insulator (SOI) waveguide technologies present opportunities for integrated photonic devices.

Purpose of the Study:

• To design and fabricate thermally-efficient tuning structures for narrowband reconfigurable RF-photonic filters.
• To achieve diverse filter responses (IIR, FIR, mixed) within a single unit cell.
• To minimize power consumption for filter tuning.

Main Methods:

• Integration of thermally-efficient tuning structures into SOI waveguide optical delay lines.
• Implementation of thermal isolation trenching to enhance thermal management.
• Fabrication of a single RF-photonic unit cell filter.

Main Results:

• Demonstration of a narrowband reconfigurable RF-photonic filter.
• Achieved Infinite Impulse Response (IIR), Finite Impulse Response (FIR), or arbitrary mixed filter responses.
• Required less than 120 mW average tuning power per filter unit cell.

Conclusions:

• The developed thermally-efficient tuning structures enable low-power reconfigurable RF-photonic filters.
• The use of thermal isolation trenching is effective in achieving diverse filter responses.
• This technology advances the development of efficient and flexible photonic signal processing.