Demonstration of a chip-based optical isolator with parametric amplification.

Area of Science:

• Integrated photonics
• Nonlinear optics
• Optoelectronics

Background:

• Achieving chip-based light non-reciprocity is critical for optical communications and signal processing.
• Conventional Faraday effect isolators face material incompatibility issues.
• Nonlinear optical approaches are limited by dynamic reciprocity.

Purpose of the Study:

• To demonstrate a novel chip-based optical isolator overcoming dynamic reciprocity limitations.
• To realize non-reciprocal light transport on a silicon platform.
• To develop a magnetic-free solution for integrated photonic devices.

Main Methods:

• Utilizing phase-matched parametric amplification via four-wave mixing.
• Employing a high-Q microtoroid resonator for enhanced light-matter interaction.
• Integrating the device with complementary metal-oxide-semiconductor (CMOS) compatible fabrication.

Main Results:

• Demonstrated highly non-reciprocal light transport at 1,550 nm wavelength.
• Achieved convincing isolation performance with low insertion loss across various input power levels.
• Verified functionality in two distinct operating configurations for bidirectional wave injection.

Conclusions:

• Successfully designed and fabricated a chip-based, magnetic-free optical isolator.
• The demonstrated device is compatible with existing CMOS technology.
• This work paves the way for advanced optical information processing and laser protection systems.