Phase controlled integrated interferometric single-sideband filter based on planar Bragg gratings implementing...

Area of Science:

• Photonics
• Optical Engineering
• Materials Science

Background:

• Integrated photonic devices are crucial for advanced optical signal processing.
• Single-sideband (SSB) modulation is essential for efficient communication systems.
• Photonic Hilbert transforms offer a novel approach to SSB filtering.

Purpose of the Study:

• To propose and demonstrate a monolithically integrated all-optical SSB filter.
• To achieve high SSB suppression and tunable sideband switching.
• To utilize photonic Hilbert transform and Bragg gratings for compact device design.

Main Methods:

• Device fabrication using silicon-on-silica substrate, direct UV grating writing, and photolithography.
• Integration of X-coupler, photonic Hilbert transformer, flat top reflector, and micro heater.
• Thermal tuning of the device via a micro heater for controlling optical characteristics.

Main Results:

• Experimental demonstration of the monolithically integrated all-optical SSB filter.
• Achieved SSB suppression of 12 dB at 6 GHz.
• Successful sideband switching demonstrated through thermal tuning.

Conclusions:

• The proposed device offers a compact and efficient solution for all-optical SSB filtering.
• Thermal tuning provides a practical method for controlling filter performance and enabling sideband switching.
• The integration of advanced photonic components on a single substrate paves the way for next-generation optical communication systems.