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We report an optical–electrical (OE) oscillator using two new key components (a high-power integrated photoreceiver module and a low-driving-voltage lithium niobite (LN) Mach–Zehnder modulator (MZM)) to configure key parts of the entire OE oscillator system. A 60-GHz narrowband photoreceiver module integrated with a 60-GHz photodetector chip with a gain emphasis circuit and a 60-GHz high-power amplifier chip was designed and fabricated. By increasing the input photocurrent to 5 mA at 60 GHz, we successfully achieved a 1-dB power compression level of +16 dBm with good output linearity. The LN-based bulk MZM was specially designed to decrease the driving voltage to 1.5 V by optimizing both the waveguide and electrode length at high frequencies. Excellent performance with a -5 dB insertion loss at 60 GHz was achieved. The OE oscillator system was configured via a feedback loop using optical and electrical components, which primarily consisted of the newly developed photoreceiver and MZM through a 100 m–1 km long optical fiber. We successfully demonstrated -106 dBc/Hz at a 10-kHz offset near 60 GHz. The design and fabrication of the OE system are discussed in detail herein.
Conference Presentation
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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T. Umezawa, Y. Yamaguchi, A. Matsumoto, A. Kanno, K. Akahane, N. Yamamoto, "60-GHz low-phase noise optical-electrical oscillator using newly developed high-power photoreceiver module," Proc. SPIE 12885, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII, 128850E (11 March 2024); https://doi.org/10.1117/12.2691056