Silicon photonic microresonator-based high-resolution line-by-line pulse shaping

Area of Science:

• Photonics and Ultrafast Optics
• Quantum Communications
• Integrated Photonics

Background:

• Traditional optical pulse shapers face limitations in spectral resolution and scalability.
• Bulk optics and planar waveguides struggle with fine (sub-GHz) spectrum control, leading to phase errors and losses.

Purpose of the Study:

• To present a novel foundry-fabricated silicon photonic shaper for high-resolution optical pulse shaping.
• To address the limitations of existing methods by offering a compact and scalable solution.

Main Methods:

• Utilized a six-channel silicon photonic chip with microresonator filter banks and inline phase control.
• Employed comb-based spectroscopic techniques to mitigate thermal crosstalk and enable versatile on-chip shaping.
• Demonstrated phase compensation of six comb lines at tunable channel spacings (3, 4, and 5 GHz).

Main Results:

• Achieved arbitrary waveform generation in the time domain at a 3 GHz channel spacing.
• Successfully demonstrated phase compensation for multiple spectral lines with high precision.
• Validated the shaper's capability for fine spectral control and tunable channel spacing.

Conclusions:

• The developed silicon photonic shaper offers a scalable and high-precision solution for optical pulse shaping.
• This technology has significant potential for applications in ultrafast optics, radio-frequency photonics, and quantum communications.
• The design and control scheme pave the way for future advancements in spectral shaping capabilities.