Embedded ring resonators for microphotonic applications

Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Optics Letters (Impact Factor: 3.18). 10/2008; 33(17):1978-80. DOI: 10.1364/OL.33.001978
Source: PubMed

ABSTRACT We propose a new type of optical resonator that consists of embedded ring resonators (ERRs). The resonators exhibit unique amplitude and phase characteristics and allow designing compact filters, modulators, and delay elements. A basic configuration of the ERRs with two rings coupled in a point-to-point manner is discussed under two operating conditions. An ERR-based microring modulator shows a high operation speed up to 30 GHz. ERRs with distributed coupling are briefly described as well. (C) 2008 Optical Society of America.

Download full-text


Available from: Lin Zhang, Jul 01, 2015
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: High-$Q$ microresonators play an important role in developing fully integrated, highly sensitive, and cost-effective bio/chemical sensors. The Fano effect in doubly resonant physical systems may be used to improve sensing performance. In this paper, we show that coupled optical resonators (sometimes termed photonic molecules) in an embedded configuration can significantly enhance the sensitivity and limit of detection (LOD) of on-chip sensors by producing a reversed Fano effect. Improvement of one order in sensitivity, as compared to a sensor based on conventional Fano effect, can be achieved using embedded high- $Q$ resonators on a CMOS-compatible platform. We estimate the LOD by taking into account thermal drift, optical losses (material absorption, scattering, substrate leakage and bending loss), laser intensity noise, linewidth and frequency jitter, and link and detector signal-to-noise ratio (SNR). The overall LOD is found to be as low as 3.24 × 10$^{-8}$ RIU. Moreover, in the proposed sensor based on embedded rings, intensity SNR is no longer the limiting factor of the LOD, which could be further lowered with better thermal control and laser frequency stability.
    IEEE Journal of Selected Topics in Quantum Electronics 12/2013; 20(3):5200110. DOI:10.1109/JSTQE.2013.2294465 · 3.47 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We study both the intensity and phase responses in embedded rings operated in analogy to electromagnetically induced transparency. Different phase regimes have been identified, which correspond to different optical nonlinear enhancement characteristics.
    Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2013 Conference on, Kyoto; 06/2013
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We numerically analyze the characteristics of silicon-based microring modulators consisting of a single-ring resonator. Performance of the devices as digital intensity modulators is examined in terms of extinction ratio, pulsewidth, frequency chirp, spectral broadening, and signal quality. Three types of the modulators built in single-waveguide under-/overcoupling and dual-waveguide configurations are discussed. We show that cavity dynamics significantly affect the modulation properties. Data transmission performance over single-mode fibers is also presented. A silicon microring modulator with negative chirp could achieve 0.8 dB power penalty in 80-km fiber transmission without dispersion compensation.
    IEEE Journal of Selected Topics in Quantum Electronics 03/2010; DOI:10.1109/JSTQE.2009.2027816 · 3.47 Impact Factor