Spurious Tone Reduction and Signal Stabilization of Optoelectronic Oscillators by Low-Frequency RF Signal Modulationopen access
- Authors
- Cho, Jun-Hyung; Jeong, Hyo-Sang; Sung, Hyuk-Kee
- Issue Date
- 1-May-2022
- Publisher
- MDPI
- Keywords
- optoelectronic oscillator; direct modulation; spurious tone suppression; side-mode suppression ratio
- Citation
- PHOTONICS, v.9, no.5
- Journal Title
- PHOTONICS
- Volume
- 9
- Number
- 5
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/29484
- DOI
- 10.3390/photonics9050339
- ISSN
- 2304-6732
- Abstract
- In this study, the oscillation signal stabilization and spurious tone suppression of a directly modulated optoelectronic oscillator (DM-OEO) are simultaneously achieved by modulating a laser with a low-frequency radio frequency (RF) signal. The laser in the DM-OEO is modulated by a rectangular wave with a period inversely proportional to the frequency interval of the spurious tones and a duty cycle of 50%. The optical sidebands of the rectangular wave-modulated laser pulled the optical gain of the spurious tones of the DM-OEO, resulting in a spurious tone suppression and time stabilization in the DM-OEO signal. We achieve a 15 GHz DM-OEO with a 40.14 dB side-mode suppression ratio (SMSR) and 2.55 dB improvement in the oscillation power stability compared to that without RF modulation.
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Collections - College of Engineering > School of Electronic & Electrical Engineering > 1. Journal Articles
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