The IUP Journal of Electrical and Electronics Engineering
Enhanced FSR Asymmetrical Triple Optical Ring Resonator

Article Details
Pub. Date : Apr, 2020
Product Name : The IUP Journal of Electrical and Electronics Engineering
Product Type : Article
Product Code : IJEEE10420
Author Name : Parnab Saha, Sumanta Kundu, Sanjoy Mandal
Availability : YES
Subject/Domain : Engineering
Download Format : PDF Format
No. of Pages : 10

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Abstract

The paper proposes an Asymmetrical Triple Optical Ring Resonator (ATORR) and investigates its performances. Delay line signal processing scheme along with Mason's Gain Formula is implemented to develop the transfer function of this configuration. Two different materials are used for this model, i.e., SOI (2.0167) and SIN (2.811), and their frequency responses are analyzed and compared to obtain different Free Spectral Range (FSR) outputs on MATLAB. Along with widening of FSR, crosstalks and resonance loss are also reduced. The extended FSR output is in THz range that has wide application in the field of photonics.


Description

Optical ring resonator operates as type of bandpass or bandstop filter which generally operates in ranges of gigahertz and above (much higher than our standard frequency supply). In modern times, these resonators have found wide places of application like in sensors, filters, etc. The concepts of the ring resonators were first coined in 1969 by Marcatili (1969). Delay line signal processing for designing of transfer function using the Signal Flow Graph (SFG) and Mason's gain was developed by Moslehi et al. (1984) and Jackson et al. (1985). The brainstorming of technologies, i.e., advancement of fabrication technologies and software in this present era have attracted high interests on these ring resonators based on the waveguides propagation and related utilization. We all know that the stability of a system is always of prime concern; thus the stability of an optical ring resonator is also essential which is characterized by their frequency response analysis having the Free Spectral Range (FSR) as one of the main parameters. Optical ring resonator of increased FSR is always desirable as it allows a number of channels to be incorporated in them. This frequency response analysis of Single Ring Resonator (SRR) was first put forward by Suzuki et al. (1995). Digital s ignal processing approach using SFG and Mason's gain formula is used to obtain an FSR enhancement of Double Ring Resonator (DRR) and a Triple Optical Ring Resonator (TORR) was proposed by Mandal et al. (2006) with an FSR of 100 GHz with 200 GHz correspondingly. Further enhancement of FSR beyond GHz range to THz range to increase the performances was done by Sabita and Sanjoy (2012) in Quadruple Optical Ring Resonator (QORR) and in pentuple micro resonator (PORR) (Sabita et al., 2012) having their usual FSR's of 342.4 THz and 3,527 THz, respectively. Increasing the number of rings by adding one after another increases the FSR, but at the same time, the size of optical ring resonator increases, which leads to an increase in the size of ring resonators. To overcome this problem, an increase in the number of layers or entire size of ring resonator was done by Suman (2016a, 2018a and 2018b).


Keywords

Free Spectral Range (FSR), Asymmetrical Triple Optical Ring Resonator (ATORR), Transfer function

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