Z-domain modeling approach of a multilayer sextuple-coupled micro-ring resonator with 1 × 5 input-output bus waveguides as optical filters.

This paper introduces the modeling approach of a new micro-ring resonator configuration composite of six asymmetrical rings with one input and five output bus waveguides. This multilayer sextuple-coupled micro-ring resonator (MSCMRR) is modelled in the z domain by practicing the delay line signal approach and Mason's gain formula. Both lateral coupling and vertical coupling are used to design this MSCMRR structure to confine it up to four layers.

Performance analysis of triple asymmetrical optical multiple ring resonator with a 1 × 3 input-output waveguide for application as an optical filter.

Modelling of a triple asymmetrical optical multiple ring resonator (TAOMRR) with a 1×3 input-output waveguide has been carried out in the present paper, and its performance as an optical filter is analyzed. The mathematical modelling of the proposed configuration is carried out in the z domain using a delay line signal processing technique. Free spectral range (FSR), group delay, and dispersion characteristics of the proposed TAOMRR are evaluated from the frequency response plot obtained in MATLAB from all the possible input-output port configurations.

Modeling and performance analysis of vertically coupled triple microring resonator in the Z domain.

A theoretical model of vertically coupled triple microring resonators (VCTMRRs) in the Z domain is presented in this work. Delay line signal processing approach in Z-domain modeling is used for the performance analysis of waveguide-based VCTMRRs. Overall transmittance of the VCTMRR is determined in the Z domain, and frequency response is evaluated in a MATLAB environment.

Enhancement of free spectral range using pentuple microresonator.

The work addresses the issues of the ever-expanding demand of wide free spectral range (FSR) compatible integrated optic passive devices used in commercial communication systems like dense wavelength division multiplexing and a host of other applications. FSR expansion has been achieved by using the Vernier principle. The analysis has been carried out using Mason's rule and the delay line signal processing approach.

Rabeto plus: a valuable drug for managing functional dyspepsia.

The aim of the study was to evaluate and document the efficacy and tolerability of rabeto plus (FDC of rabeprazole and itopride) in management of functional dyspepsia. It was an open, prospective, non-comparative, multidose study. The patients with functional dyspepsia (NERD or non-erosive reflux disease) attending OPD of a leading, tertiary care, teaching hospital in West Bengal (BS Medical College, Bankura) were inducted in the study.

Gallbladder cancer with duodenal infiltration: is it still resectable?

Objective: To assess the resectability and the long-term survival in patients of gallbladder cancer with duodenal involvement.

Background: Duodenal infiltration in patients of carcinoma gallbladder is generally regarded as a sign of advanced disease and an indicator of unresectable disease.

Methods: A total of 252 patients of gallbladder cancer (GBC) who underwent surgery over a 5-year period were studied for duodenal involvement.

Biliary obstruction in gall bladder cancer is not sine qua non of inoperability.

Background: The presence of biliary obstruction in patients with gallbladder cancer (GBC) is generally viewed as an indicator of advanced disease, inoperability and poor prognosis.

Methods: Data was collected from patients with GBC with obstructive jaundice who underwent resection during the period January 2001 to October 2003. Systematic analysis of prospective data was undertaken; patients were analyzed for resectability, post-operative morbidity, mortality and disease-free survival.

Modeling and analysis of an extrinsic Fabry-Perot interferometer cavity.

A schematic representation of optical feedback between two resonator mirrors undergoing a phase shift each round trip as a function of the separation of the mirrors is studied. A transfer function modeling of the extrinsic Fabry-Perot interferometer (EFPI) is presented. Nyquist analysis has been used to forecast the operational stability and possibility of interference in an EFPI.

Unusual complication of internal jugular vein cannulation.

Internal jugular cannulation is a common procedure in the hospitals. We report a rare complication where the guide wire was pushed into the internal jugular vein without threading the catheter through. Complications due to central venous cannulation are also discussed.