Reduction of Spurious Tones and Phase Noise in Dual-Loop OEO by Loop-Gain Control
- Authors
- Cho, Jun-Hyung; Kim, Hyungtak; Sung, Hyuk-Kee
- Issue Date
- 1-Jul-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Dual-loop; loop gain; optoelectronic oscillators; phase noise; spurious modes
- Citation
- IEEE PHOTONICS TECHNOLOGY LETTERS, v.27, no.13, pp.1391 - 1393
- Journal Title
- IEEE PHOTONICS TECHNOLOGY LETTERS
- Volume
- 27
- Number
- 13
- Start Page
- 1391
- End Page
- 1393
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/9666
- DOI
- 10.1109/LPT.2015.2421892
- ISSN
- 1041-1135
- Abstract
- Although a long loop delay in an optoelectronic oscillator (OEO) is essential for achieving a low-phase-noise signal, it generates narrowly spaced spurious modes that cannot be filtered out. Conventional dual-loop OEOs proposed to suppress the spurious modes exhibit degraded phase-noise performance compared with single-loop OEOs because of the short fiber loop in dual-loop OEOs. To overcome the decrease in phase-noise performance, we investigated both theoretically and experimentally the open-loop characteristics of the dual-loop OEO. We found that the spurious modes can be eliminated without degradation in the phase-noise performance by properly controlling the open-loop gain of the OEO. Through gain control, we successfully demonstrated the suppression of spurious modes by more than 21 dB.
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Collections - College of Engineering > School of Electronic & Electrical Engineering > 1. Journal Articles
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