Academic literature on the topic 'Serially Coupled Double Microring Resonator'

Free spectral range (FSR) of reflection spectrum of micro-ring resonator restricts the improvement in user capacity of the optical code division multiple access (OCDMA) system using micro-ring resonator array. Vernier effects can expand FSR of cascaded optical microring resonator. Based on vernier effect, a novel two-dimensional coherent optical en/decoder using serially coupled dumbbell micro-ring resonator is proposed in this paper. The theoretical model of optical transmission for series dumbbell-shaped microring resonators is established. The relation between the suppression of pseudo-modes in optical reflection spectrum and the coupling coefficient is analyzed in detail. The effects of coupling coefficient, processing error and chip rate on the performance of series dumbbell microring resonator optical en/decoder are studied. The en/decoding simulation experiments are carried out on a series dumbbell-shaped micro-ring resonator with radius of 40 μm-30 μm-40 μm respectively. The results show that comparing with the traditional series micro-ring resonator with radius of 40 μm-40 μm-40 μm respectively, the FSR value of dumbbell microcavity is increased by 4 times and the user capacity can increase exponentially. Meanwhile, the ratio of autocorrelation peak to maximum wing (<i>P</i>/<i>W</i>) and the cross-correlation ratio (<i>P</i>/<i>C</i>) are increased by about 33% and 8%, respectively.

In near future, silicon-on-insulator (SOI) microring resonator are expected to be basic components for wavelength filtering and switching due to their compact size and wide free spectral range (FSR). In this paper, a 2X2 optical switch by using active microring resonator is proposed. The switch is consists of second order serially cascaded microring coupled to a pair of waveguide. The ON/OFF state of the design is control by electric signal which will vary the refractive index. The device is design to operate at 1.55µm wavelength. With a 500nm x 200nm rib dimensions, the design is proven to have single mode behaviour. Finite-Difference Time-Domain (FDTD) method simulation by RSOFT software is use to characterize the device performance. The results show that the 2X2 optical switch proposed can be an efficient device to be functioning in WDM application.

AbstractA serially coupled double-ring resonator using the low loss multilayer silicon wire waveguide is presented that has featured high out-of-band rejection and high finesse. The round trip loss and Q factor has also been calculated and found moderate. However, extremely low loss waveguide has shown reduced coupling between the ring and the waveguide.

Microring resonators have rapidly emerged in the past few years as a new sensing platform for miniaturization of modern integrated optical devices. Ring resonator are having advantages of compactness, stability with respect to back reflections, do not need facets or gratings for optical feedback, strong optical field enhancement inside cavities, high wavelength selectivity, narrow line width, high Q-factor and high sensitivity. These unique characteristics made microring resonator as promising platform for integrated photonics.. A generic ring resonator consists of an optical waveguide which is looped back on it self and coupled with a single or double bus waveguide. In this thesis, a compact microring resonator (MRR) is proposed and optimized to exhibit high sensitivity and quality factor. Also, force and acceleration sensing applications of MRR are discussed. Electromagnetic computations are done using Finite Difference Time Domain (FDTD) method. Fabrication and characterization of microring is also carried out. While the main emphasis is on design and analysis, this experimental work supports better understanding of practical issues in study of microring resonators. Then, the force sensing application of the optimized microring resonator is presented. The design and modeling of the devices, including the mechanical properties of the microcantilever beam, are done by using a Finite Element Method (FEM). The force sensing characteristics are presented for the force range of 0 to 1 μN. The drawbacks of single MRR can be overcome by using serially coupled double microring resonator(SC-DMRR) and serially coupled double racetrack resonator (SC-DRTR) with vernier effect. They provide, high FSR, low FWHM, high Q-factor and high sensitivity. By using SC-DMRR as an optical sensing element, a novel IO MEMS SC-DMRR based force sensor is proposed, resulting in high Q-factor of 19000 and force sensitivity of 100 pm/ 1μN. Further, in order to increase the sensitivity, a novel SCDRTR based force sensor is proposed. The study is expanded to photonic crystal microring resonator (PC-MRR) structures, where a PCMRR is designed in a hexagonal lattice of air holes on a silicon slab. A novel approach is used to optimize PC-MRR to achieve high Q-factor. A high sensitive force sensor based on PC-MRR integrated with silicon micro cantilever is presented. The force sensing characteristics are presented for forces in the range of 0 to 1 μN. For forces which are in the range of few tens of μN, a force sensor with bilayer cantilever is considered. Further, the PC-MRR equivalent microring resonator is designed and analyzed for comparison between the force sensors. Finally, a novel IO MEMS serially coupled racetrack resonator based accelerometer is proposed and the required characteristics like sensitivity and dynamic range are reported. In conclusion, IO micro ring resonators are the best candidates to design and develop force and acceleration sensors in the sub-μN sensitivities.