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Proceedings Paper

A new technique to monitor the long-term stability of an optoelectronic oscillator.
Author(s): Toan Thang Pham; Isabelle Ledoux-Rak; Bernard Journet; Van Yem Vu
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Paper Abstract

The main advantage of an optoelectronic oscillator (OEO) is the ability to synthesize directly very high spectral purity frequency in microwave domain. Beside applications in radar, telecommunication and satellite systems, OEO can also be used in sensor applications such as refractive index or distance measurements. However, the long-term stability of the OEO is easily affected by ambient environment variations. The optical fiber loop effective refractive index varies corresponding to its surrounding temperature changes. Consequently, it makes the optical transmission path inside the fiber loop differ from the initial state, leading to oscillation frequency changes. To stabilize the single loop OEO, it is essential to keep its high Q elements in a well-controlled thermal box as much as possible. Unfortunately, in the real implementation condition, this requirement is difficult to be satisfied. In this paper, we present a new technique to estimate the oscillation frequency variation under the room temperature by using a vector network analyzer (VNA). Experimental results show a good correlation between OEO oscillation frequency drift and the phase measured by the VNA. This technique can be implemented to apply corrections when using the OEO as a distance variation or a refractive index measurement tool. We also tracked the temperature of the fiber loop at the same time with the VNAbased experiment to compare two correlations of temperature and phase with OEO oscillation frequency.

Paper Details

Date Published: 6 January 2015
PDF: 9 pages
Proc. SPIE 9450, Photonics, Devices, and Systems VI, 94500C (6 January 2015); doi: 10.1117/12.2070357
Show Author Affiliations
Toan Thang Pham, Lab. de Photonique Quantique et Moléculaire, CNRS, École Normale Supérieure de Cachan (France)
Isabelle Ledoux-Rak, Lab. de Photonique Quantique et Moléculaire, CNRS, École Normale Supérieure de Cachan (France)
Bernard Journet, Lab. de Photonique Quantique et Moléculaire, CNRS, École Normale Supérieure de Cachan (France)
Van Yem Vu, Hanoi Univ. of Technology (Viet Nam)


Published in SPIE Proceedings Vol. 9450:
Photonics, Devices, and Systems VI
Pavel Tománek; Dagmar Senderáková; Petr Páta, Editor(s)

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