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Proceedings Paper

All optical modulator based on silicon resonator
Author(s): Hadar Pinhas; Liron Bidani; Oded Baharav; Moshe Sinvani; Meir Danino; Zeev Zalevsky
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Paper Abstract

In this paper we present an all-optical silicon modulator, where a silicon slab (450 μm) thick is coated on both sides to get a Fabry-Perot resonator for laser beam at wavelength of 1550nm. Most of the modulators discussed in literature, are driven by electrical field rather than by light. We investigate new approaches regarding the dependence of the absorption of the optical signal on the control laser pulse at 532 nm having 5nm pulse width. Our silicon based Fabry-Perot resonator increases the intrinsic c-Si finesse to >10, instead of the uncoated silicon with natural finesse of 2.5. The improved finesse is shown to have significant effect on the modulation depth using a pulsed laser. A modulation of 12dB was attained. The modulation is ascribed to two different effects - The Plasma Dispersion Effect (PDE) and the Thermo- Optic Effect (TOE). The PDE causes increase in the signal absorption in silicon via the absorption of the control laser light. On top of that, the transmission of the signal can decrease dramatically in high finesse resonators due to change in the refractive index due to TOE. The changes in the signal's absorption coefficient and in the refractive index are the result of incremental change in the concentration of free carriers. The TOE gives rise to higher refractive index as opposed to the PDE which triggers a decrease in the refractive index. Finally, tradeoff considerations are presented on how to modify one effect to counter the other one, leading to an optimal device having reduced temperature dependence.

Paper Details

Date Published: 28 August 2015
PDF: 7 pages
Proc. SPIE 9609, Infrared Sensors, Devices, and Applications V, 96090L (28 August 2015); doi: 10.1117/12.2186781
Show Author Affiliations
Hadar Pinhas, Bar-Ilan Univ. (Israel)
Liron Bidani, Bar-Ilan Univ. (Israel)
Oded Baharav, Bar-Ilan Univ. (Israel)
Moshe Sinvani, Bar-Ilan Univ. (Israel)
Meir Danino, Bar-Ilan Univ. (Israel)
Zeev Zalevsky, Bar-Ilan Univ. (Israel)

Published in SPIE Proceedings Vol. 9609:
Infrared Sensors, Devices, and Applications V
Paul D. LeVan; Ashok K. Sood; Priyalal Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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