Reduction of Spurious Tones and Phase Noise in Dual-Loop OEO by Loop-Gain Control

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...

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Bibliographic Details
Published in:IEEE photonics technology letters 2015-07, Vol.27 (13), p.1391-1393
Main Authors: Cho, Jun-Hyung, Kim, Hyungtak, Sung, Hyuk-Kee
Format: Article
Language:English
Subjects:
Degradation
Delay
Dual-loop
Gain
Gain control
Loop gain
Noise
Optical amplifiers
Optical fiber amplifiers
Optoelectronic oscillators
Optoelectronics
Oscillators
Phase noise
Photonics
Short fibers
Spurious modes
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2015.2421892