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Proceedings Paper

Compact optoelectronic oscillators using WGM modes on fused silica and MgF2 mini-disks resonators
Author(s): P. Salzenstein; K. Volyanskiy; H. Tavernier; E. Rubiola; L. Larger
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Paper Abstract

This study deals with a design, fabrication and characterization of compact optoelectronic oscillators (OEO). Resonator behaves as a sphere because energy is trapped in whispering-gallery-modes in the equatorial region. For this purpose, Fused-silica and MgF2 are suitable, due to their mechanical characteristics and their low attenuation at 1.55 μm wavelength. In fact, 6-7 degrees Mohs hardness of these materials allows us to obtain a quite easy precision-processing. Our prototype owns a quality factor of approximately 3×108, which is certainly limited by the available technology. Resonator is coupled to an optical fiber including a taper-waveguide-based on a nm-position resolution. Microwave carrier is generated by locking optical phase modulation to a free-spectral-range (FSR) resonator, which occurs in the X-band. Moreover, this carrier is detected by a standard low-noise InGaAs p-i-n telecom photodiode. Oscillator prototype is assembled on a 0.12 m2 optical breadboard. In principle, this surface can be reduced to those of the oscillator main parts (resonator, laser, photodiode, amplifier and optical modulator). Oscillator phase noise measured by a dual-delay-line instrument, which has been developed in Besançon, corresponds to -90 dBrad2/Hz at 10 kHz off carrier. According to this result, oscillator suffers from severe noise-limitations due to several reasons: the thermal coefficient of the resonator, the low power that the resonator can accept, and the small volume of the energy-confinement region in the resonator (≈2×1014 m3) but our oscillator is packaged in a small volume, contrarily to classic OEO based on an optical fiber of a few km.

Paper Details

Date Published: 13 May 2010
PDF: 9 pages
Proc. SPIE 7716, Micro-Optics 2010, 77162C (13 May 2010); doi: 10.1117/12.854392
Show Author Affiliations
P. Salzenstein, Ctr. National de la Recherche Scientifique (France)
K. Volyanskiy, Ctr. National de la Recherche Scientifique (France)
State Univ. of Aerocosmic and Instrumentration (Russian Federation)
H. Tavernier, Ctr. National de la Recherche Scientifique (France)
E. Rubiola, Ctr. National de la Recherche Scientifique (France)
L. Larger, Ctr. National de la Recherche Scientifique (France)

Published in SPIE Proceedings Vol. 7716:
Micro-Optics 2010
Hugo Thienpont; Peter Van Daele; Jürgen Mohr; Hans Zappe, Editor(s)

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