The throughput of a single fiber-coupled whispering-gallery microresonator, such as a fused-silica microsphere, can exhibit induced transparency or absorption, leading to pulse delay or advancement, through the interaction of two coresonant orthogonally polarized whispering-gallery modes having very different quality factors (Q). There are two ways by which these behaviors may be realized. The first method, coupled-mode induced transparency and absorption (CMIT, CMIA), relies on intracavity cross-polarization coupling when only one mode is driven. The second method, coresonant polarization induced transparency and absorption (CPIT, CPIA), uses a simple superposition of orthogonal throughputs (in the absence of intracavity cross-polarization mode coupling) when the two modes are simultaneously driven. In both cases, the throughput behavior is observed on the same polarization component as that of the linearly polarized input. The pulse delay or advancement can be enhanced by taking advantage of the multimode capability of the tapered-fiber coupler, an advantage that is not available to free-space-beam-driven ring resonators. Some predictions of a numerical model for this enhancement, which assumes experimentally realistic conditions, are presented here.

Date Published: 21 February 2014
PDF: 8 pages
Proc. SPIE 8998, Advances in Slow and Fast Light VII, 899813 (21 February 2014); doi: 10.1117/12.2047532

Published in SPIE Proceedings Vol. 8998:
Advances in Slow and Fast Light VII
Selim M. Shahriar; Frank A. Narducci, Editor(s)