T. Srinivas

Design of MOEM vibration sensor using optical microring resonator and microcantilever beam

MEMS have made a great impact on sensing applications meeting the recent requirement for miniaturization. In this paper we propose and analyze an optical MEMS vibration sensor which exploits the photoelastic property of integrated optical microring resonator due to vibration of microcantilever beam. The sensor so designed is directed for use in determining engine vibrations up to the range of 8600g. 2D simulation has been performed for a microring resonator design of ring radius 6µm and waveguide width 0.5µm. The designed microcantilever beam is of dimensions 800µm × 300µm × 10µm. For the designed MOEMS vibration sensor, a wavelength shift of 100pm and 200pm has been observed for a force of 100µN and 400µN respectively. The sensitivity of the designed vibration sensor is found to be 0.0274pm/g for 7302.19g.

Analysis of integrated optofluidic lab-on-a-chip fluorescence biosensor based on transmittance of light through a fluidic gap

Sensitivity analysis is an important aspect to be looked into while designing lab-on-a-chip systems. In this paper we will be showing with appropriate design that the best sensitivity of the fluorescence biosensor is achieved for an optimal width of fluidic gap, corresponding to a particular mode spot size. We will be also showing that the sensitivity of the biosensor is affected by efficiency of light coupling, which is influenced by changes in the width of fluidic gap, refractive index of the fluid and higher order modes.

Comparison of Performance of ROADMs in Optical Networks with BPP Traffic Models

Reconfigurable Optical Add / Drop Multiplexer is a subsystem of All Optical Networks. In this paper we compare the performance analysis of ROADMs with one and two switches in between the multiplexers with different traffic means under different traffic models. To analyze the routing performance of different categories ROADMs, BPP model has been used. As per the simulated results, when traffic peakedness Z is increases Bernoulli model is preferred because it allows to get full routing power for more switches As the traffic mean increases, the full routing power value decreases only in Poisson and Pascal models.

Multiplexed Signal Distribution Using Fiber Network For Radar Applications

Most of the modern Active phased Array Radars consist of multiple receive modules in an Antenna array. This demands the distribution of various Local Oscillator Signals (LOs) for the down conversion of received signals to the Intermediate Frequency (IF) band signals. This is normally achieved through Radio Frequency (RF) cables with Complex distribution networks which adds additional weight to the Arrays. Similarly these kinds of receivers require Control/Clock signals which are digital in nature, for the synchronization of all receive modules of the radar system which are also distributed through electrical cables. In addition some of the control messages (Digital in nature) are distributed through Optical interfaces. During Transmit operation, the RF transmit Signal is also distributed through the same receiver modules which will in turn distribute to all the elements of the Array which require RF cables which are bulky in nature. So it is very essential to have a multiplexed Signal distribution scheme through the existing Optical Interface for distribution of these signals which are RF and Digital in nature. This paper discusses about various distribution schemes for the realization in detail. We propose a distribution network architecture where existing fibers can be further extended for the distribution of other types of signals also. In addition, it also briefs about a comparative analysis done on these schemes by considering the complexity and space constraint factors. Thus we bring out an optimum scheme which will lead to the reduction in both hardware complexity and weight of the array systems. In addition, being an Optical network it is free from Electromagnetic interference which is a crucial requirement in an array environment.

Routing Analysis and Flexibility of ROADMs in All Optical Networks

Reconfigurable Optical Add / Drop Multiplexer is a subsystem of All Optical Networks. In this paper we analyze the routing performance of different ROADMs at dynamic traffic using Bernoulli, Poisson and Pascal distribution models. A theoretical routing power model is considered and through simulation results, the routing power and blocking probability have been evaluated to achieve better performance and flexibility.

An analysis on WDM components in flat gain regions of EDFA

Wavelength-division multiplexing (WDM) technology, by which multiple optical channels can be simultaneously transmitted at different wavelengths through a single optical fiber, is a useful means of making full use of the low-loss characteristics of optical fibers over a wide-wavelength region. The present day multifunction RADARs with multiple transmit receive modules requires various kinds of signal distribution for real time operation. If the signal distribution can be achieved through optical networks by using Wavelength Division Multiplexing (WDM) methods, it results in a distribution scheme with less hardware complexity and leads to the reduction in the weight of the antenna arrays In addition, being an Optical network it is free from Electromagnetic interference which is a crucial requirement in an array environment. This paper discusses about the analysis performed on various WDM components of distribution optical network for radar applications. The analysis is performed by considering the feasible constant gain regions of Erbium doped fiber amplifier (EDFA) in Matlab environment. This will help the user in the selection of suitable components for WDM based optical distribution networks.

SOI strip waveguide microring resonator for homogeneous biosensing

We report the simulation and analytical results obtained for homogenous or bulk sensing of protein on Siliconon- insulator strip waveguide based microring resonator. The radii of the rings considered are 5 μm and 20 μm; the waveguide dimensions are 300 × 300 nm. A gap of (i) 200 nm and (ii) 300 nm exists between the ring and the bus waveguide. The biomaterial is uniformly distributed over a thickness which exceeds the evanescent field penetration depth of 150 nm. The sensitivities of the resonators are 32.5 nm/RIU and 17.5 nm/RIU (RIU - Refractive index unit) respectively.