Full spectrum millimeter-wave modulation

Area of Science:

• Photonics and Optical Engineering
• Materials Science
• Telecommunications

Background:

• Advancements in lithium niobate (LiNbO3) electro-optic modulators are crucial for meeting the demand for faster optical networks.
• Existing modulator designs face limitations in operational bandwidth, hindering the progress of next-generation communication systems.

Purpose of the Study:

• To develop a novel lithium niobate electro-optic phase modulator with significantly enhanced operational bandwidth.
• To achieve bandwidths exceeding 300 GHz for future high-speed optical networks.

Main Methods:

• Designed a lithium niobate electro-optic phase modulator utilizing a coplanar waveguide ridged structure.
• Employed advanced material processing techniques to thin the lithium niobate substrate to less than 39 µm.
• Characterized modulator performance across the millimeter-wave spectrum.

Main Results:

• The developed modulator demonstrated operational bandwidths up to 300 GHz.
• Thinning the lithium niobate substrate effectively eliminated substrate modes.
• Optical sidebands were observed across the entire millimeter-wave spectrum, confirming high-frequency performance.

Conclusions:

• The novel ridged structure and substrate thinning technique enable unprecedented bandwidths in lithium niobate modulators.
• This advancement supports the development of ultra-high-speed optical networks and future communication technologies.
• The demonstrated performance paves the way for next-generation telecommunications infrastructure.