Optical measurement of the phase shift introduced by a slow-light medium based on coupled erbium-doped fiber resonators

Yannick Dumeige; Thi Kim Ngân Nguyên; Laura Ghisa; Stéphane Trebaol; Patrice Féron

doi:10.1117/12.763552

29 January 2008 Optical measurement of the phase shift introduced by a slow-light medium based on coupled erbium-doped fiber resonators

Yannick Dumeige, Thi Kim Ngân Nguyên, Laura Ghisa, Stéphane Trebaol, Patrice Féron

Author Affiliations +

Proceedings Volume 6904, Advances in Slow and Fast Light; 690407 (2008) https://doi.org/10.1117/12.763552
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

Since the proposition of D.D. Smith et al. [Phys. Rev. A 69 pp. 063804, 2004], the experimental demonstration of coupled resonator induced transparency has been made using passive fiber or whispering-gallery-mode microspheres. These demonstrations show that it is possible to integrate delay lines using high quality resonators. The maximal group delay that it can be introduced depends mainly on the relative value of the intrinsic losses with respect to the value of the coupling between the resonators. In this paper we experimentally show that the limit given by the intrinsic losses of the resonators can be circumvented by using active resonators. Our experimental setup consists in two coupled Er³⁺ doped fiber resonators. Each resonator can be pumped independently. Consequently, the values of the residual losses in the two resonators can also be modified independently. We then show that the transparency of the coupled resonators can be maximized using the right pumping rate in each resonator. By inserting this device into one arm of a fiber Mach-Zehnder interferometer we are able to optically measure the phase shift produced by the coupled resonators as a function of the optical frequency. The group delay can be deduced from this information.

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Yannick Dumeige, Thi Kim Ngân Nguyên, Laura Ghisa, Stéphane Trebaol, and Patrice Féron "Optical measurement of the phase shift introduced by a slow-light medium based on coupled erbium-doped fiber resonators", Proc. SPIE 6904, Advances in Slow and Fast Light, 690407 (29 January 2008); https://doi.org/10.1117/12.763552

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