Sanjoy Mandal

Off-axis optical quadruple racetrack resonator: performance optimization

Abstract Optical asymmetric off-axis quadruple racetrack resonator based on optical signal processing technique has been analyzed in this work for detecting its filter performance in terms of optimization of the crosstalk and resonance loss. The analytical approach utilized for deriving the transfer function of the filter is based on Mason’s gain formula and Vernier principle. The constituent material employed for developing this architecture is Silicon-on-Insulator (SOI). Light wave from the optical source at the in port enters the designed system and comes out through the drop port of two racetrack resonators that are in close proximity with output waveguide. Crosstalk level and resonance losses get minimal while calculating drop port transmittance at resonance. It is shown in this work that coupling coefficients largely contribute in crosstalk and resonance loss optimization. The extended FSR achieved in this architecture also proves its candidature in diverse fields of photonics, i.e. optical lasing and THz communication. The optimum resonance loss and crosstalk level, crosstalk suppression bandwidth are also investigated in this paper.

Analytical approach for modeling and performance analysis of microring resonators as optical filters with multiple output bus waveguides

Abstract. A quadruple micro-optical ring resonator (QMORR) with multiple output bus waveguides is mathematically modeled and analyzed by making use of the delay-line signal processing approach in Z-domain and Mason’s gain formula. The performances of QMORR with two output bus waveguides with vertical coupling are analyzed. This proposed structure is capable of providing wider free spectral response from both the output buses with appreciable cross talk. Thus, this configuration could provide increased capacity to insert a large number of communication channels. The simulated frequency response characteristic and its dispersion and group delay characteristics are graphically presented using the MATLAB environment.

Designing optical square resonator based filter and stability analysis

Design of Optical double square resonator, with constituent waveguide material as Silicon-on-Insulator, based optical filter and its stability analysis has been stated in this work. The frequency response has been analyzed using delay line signal processing technique in z-domain and Masons gain formula. On the basis of Vernier principle enhanced free spectral range has been obtained as much as 219.2 THz for drop port transmittance that is suited for THz communication in C-band. Here interstitial spurious transmission is around −100dB with negligible resonance loss. Round off noise power spectrum characteristics, depth of modulation, group delay are also determined for this architecture.