Kavli Affiliate: John E. Bowers
| First 5 Authors: Sadra Rahimi Kari, Paolo Pintus, John E. Bowers, Matt Robbins, Nathan Youngblood
| Summary:
We present a compact, resonant-based coherent modulator on a thin-film
lithium niobate (TFLN) platform, addressing the growing demand for high-speed,
energy-efficient modulators in modern telecommunications. The design
incorporates Mach-Zehnder Interferometers (MZIs) with a Gires-Tournois etalon
in each arm with a modulation region of only ~80 micrometers, eliminating the
need for traveling-wave electrodes and enabling compatibility with
wavelength-division multiplexing (WDM). Experimental results demonstrate a
modulation bandwidth of 29 GHz, while ensuring low optical loss and high
scalability. Our architecture supports in-phase and out-of-phase modulation,
enabling differential control of amplitude and phase for advanced modulation
formats such as quadrature amplitude modulation (QAM). Compared to previous
designs, our approach enhances throughput, modulation density, and scalability,
making it ideal for applications in coherent communications and optical
computing. By combining the advantages of the TFLN platform with innovative
resonator engineering, this work advances the development of compact,
high-performance modulators for high-density on-chip communication networks.
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