Demonstration of a compact wavelength tracker using a tunable silicon resonator

Area of Science:

• Photonics
• Integrated optics
• Optical sensing

Background:

• Traditional optical wavelength trackers often have slow response times, limiting their use in dynamic systems.
• Thermo-optic (TO) effects provide wide wavelength tunability but are typically slow (~10 μs).
• Electro-optic (EO) effects offer fast modulation but are often limited in tuning range.

Purpose of the Study:

• To develop a chip-scale integrated optical wavelength tracker with significantly improved response speed and a compact form factor.
• To leverage both electro-optic (EO) and thermo-optic (TO) effects for enhanced performance.
• To demonstrate a device suitable for advanced DWDM networks, tunable lasers, and optical sensors.

Main Methods:

• Utilized a silicon micro-ring resonator filter controlled by both thermo-optic (TO) and electro-optic (EO) effects.
• Integrated a photodiode onto the photonics chip for a complete, compact system.
• Exploited the EO effect to achieve fast wavelength tracking (< 1 ns).

Main Results:

• Demonstrated a chip-scale optical wavelength tracker with a footprint of 0.5 mm × 1.5 mm.
• Achieved a fast response time of tracking within 1 nanosecond (ns), a significant improvement over traditional TO methods (~10 μs).
• The tracker operates over a wide wavelength range due to the TO effect, enhanced by the EO effect for speed.

Conclusions:

• The proposed integrated optical wavelength tracker offers a fast and compact solution for wavelength monitoring.
• The combined EO and TO effects provide a powerful approach for high-performance optical tracking.
• This technology has strong potential for applications in advanced telecommunications and sensing.