Journal
IEEE PHOTONICS JOURNAL
Volume 14, Issue 4, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3185888
Keywords
Optical waveguides; Silicon; Modulation; Radio frequency; Gratings; Optical distortion; Optical device fabrication; Grating; modulator; photonics; RF-photonics; slow-light
Funding
- ARL [W911NF-16-2-0049]
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An integrated RF-photonic link using a slow-light enhanced silicon electro-optic modulator, a single mode Si optical waveguide, and a silicon-germanium photodetector was fabricated. By optimizing the parameters of the Si Mach-Zehnder modulator, high SFDR and modulation efficiency were achieved in the slow-light region.
An integrated RF-photonic link that consists of a slow-light enhanced silicon (Si) electro-optic modulator, a single mode Si optical waveguide and a silicon-germanium (SiGe) photodetector was fabricated using a Si photonic standard foundry service. The third-order intermodulation distortion (IMD3) of the RF signals and the link spur-free dynamic range (SFDR) were characterized through a two-tone test method. The Si Mach-Zehnder modulator architecture is designed to have unequal arms to operate on a simplified driving scheme. As a result, on-chip thermal heaters can be omitted, and the modulator can configure near its quadrature point by adjusting the wavelength to the modulator. Owning to enhanced light-matter interaction in the slow-light region, an increased slope efficiency is observed in the modulator. By selecting the optimal DC bias to the grating and the reference arms of the modulator, a SFDR of 96 dB/Hz(2/3) can be obtained in the RF link at the slow light region. The slow-light modulator also displays increased modulation efficiency, allowing for a reduced footprint for large array integration.
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