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Area of Science:

Photonics
Materials Science
Electrical Engineering

Background:

Integrated electro-optic modulators are crucial for high-fidelity broadband signal transmission in integrated microwave photonic (IMWP) links.
Achieving large bandwidth, high linearity, and low driving voltage simultaneously remains a challenge.

Purpose of the Study:

To propose and demonstrate a novel thin-film lithium niobate electro-optic modulator.
To achieve a high spurious-free dynamic range (SFDR) with large bandwidth and low half-wave voltage.

Main Methods:

Utilized a thin-film lithium niobate platform.
Incorporated a thermo-optic reconfigurable coupler.
Employed a dual-parallel Mach-Zehnder modulation scheme.

Main Results:

Demonstrated a spurious-free dynamic range of 112.87/107.71 dB·Hz^2/3 at 1/10 GHz.
Achieved a large bandwidth exceeding 67 GHz.
Maintained a low half-wave voltage of 2.7 V.

Conclusions:

The developed modulator offers a new pathway for high-performance electro-optic modulators.
This device is suitable for future functional integrated microwave photonic systems.
The simultaneous achievement of high SFDR, bandwidth, and low voltage is a significant advancement.