Qualification: Ph. D.

Dr. Kaustav Bhowmick currently serves as Assistant Professor(SG) at the department of Electronics and Communication Engineering, Amrita School of Engineering, Bengaluru campus.


  • Ph. D. Scholar, University of Nottingham, UK
  • Research Fellow, Nanyang Technological University, Singapore
  • Assistant Professor (Ad Hoc), National Institute of Technology, Sikkim 
  • Assistant Professor (Selection Grade), Amrita Vishwa Vidyapeetham

Awards and Recognition

Year Name of Award Awarding Agency
2016- Till Date  IEEE Photonics Execom Member, Collaborations Coordinator IEEE Execom Chair, Prof. T. Srinivas (IISc., Bangalore)
2016 Chartered Engineer, Institution of Engineers, India IE- India
2015 Member Institution of Engineers, India IE- India
2008 Nottingham Research Scholarship University of Nottingham
2006 Nottingham-British Council Joint Chevening Scholarship British Council


Publication Type: Journal Article

Year of Publication Title


T. Sreenivasulu, Dr. Kaustav Bhowmick, Samad, S. Abdul, Yadunath, T. Illam Rame, Badrinarayana, T., Hegde, G. M., and Srinivas, T., “Photonic crystal ring resonator-based four-channel dense wavelength division multiplexing demultiplexer on silicon on insulator platform: design and analysis”, Optical Engineering, vol. 57, no. 4, pp. 1 - 9 - 9, 2018.[Abstract]

A micro/nanofabrication feasible compact photonic crystal (PC) ring-resonator-based channel drop filter has been designed and analyzed for operation in C and L bands of communication window. The four-channel demultiplexer consists of ring resonators of holes in two-dimensional PC slab. The proposed assembly design of dense wavelength division multiplexing setup is shown to achieve optimal quality factor, without altering the lattice parameters or resonator size or inclusion of scattering holes. Transmission characteristics are analyzed using the three-dimensional finite-difference time-domain simulation approach. The radiation loss of the ring resonator was minimized by forced cancelation of radiation fields by fine-tuning the air holes inside the ring resonator. An average cross talk of −34  dB has been achieved between the adjacent channels maintaining an average quality factor of 5000. Demultiplexing is achieved by engineering only the air holes inside the ring, which makes it a simple and tolerant design from the fabrication perspective. Also, the device footprint of 500  μm2 on silicon on insulator platform makes it easy to fabricate the device using e-beam lithography technique.

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Dr. Kaustav Bhowmick, Furniss, D., Morvan, H. P., Seddon, A. B., and Benson, T. M., “Predictive, Miniature Co-Extrusion of Multilayered Glass Fiber-Optic Preforms”, Journal of the American Ceramic Society, vol. 99, no. 1, pp. 106-114, 2016.[Abstract]

A miniature co-extrusion technique, to produce a concentric multilayered glass fiber-optic preform of 3 mm diameter, is modeled and experimentally demonstrated. A three-dimensional, incompressible, noncavitating, and nonisothermal Computational Fluid Dynamics (CFD) model, similar to one developed in our previous work, is used to predict the dimensions of an alternating four-layer glass stack feed required to produce the desired layer dimensions in a multilayered-glass preform extrudate, using a miniaturized and thus more economical co-extrusion. Strong agreement in the cross-sectional geometrical proportions of the simulated and experimentally obtained preform supports the prowess of the predictive modeling. Nevertheless, some small deviations between the simulated and experimentally obtained dimensions indicate topics for future rheological study. Performing the co-extrusion process under vacuum helps to minimize the inter-layer defects in the multi-layered fiber-optic preform. The miniature co-extrusion potentially removes the need for a postextrusion draw-down prior to fiber drawing, avoiding devitrification issues possible in non-oxide novel glass compositions. More »»


Dr. Kaustav Bhowmick, Morvan, H. P., Furniss, D., Seddon, A. B., and Benson, T. M., “Co-Extrusion of Multilayer Glass Fiber-Optic Preforms: Prediction of Layer Dimensions in the Extrudate”, Journal of the American Ceramic Society, vol. 96, no. 1, pp. 118-124, 2013.[Abstract]

A three-dimensional, incompressible and noncavitating model of a glass-stack coextrusion process, under isothermal and non-isothermal conditions is numerically simulated by means of computational fluid dynamics. A dynamic mesh approach is taken in a domain-subdomain type setup to simulate the transient steps in the steady-velocity phase of the experimental co-extrusion. The multiphase setup consists of a glass-stack which is composed of different glass compositions. Experimentally measured glass properties, such as the temperature coefficient of the viscosity of the supercooled glass melts are used to define the flow behavior of the glasses in the starting stack when extruded. The modeled extrudate is numerically verified for transient and spatial errors, leading to the choice of a suitable mesh. Excellent agreement is found between modeling and experiment when plotting the core/cladding dimensions of a step-index extruded fiber-optic preform along the length of the preform. This approach can identify the stable part of the preform, in terms of constant core/cladding layer geometry, obviating costly and time-consuming experimental iteration. Also, the modeling allows prediction of the starting glass-stack dimensions for a specified fiber design.

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Publication Type: Book Chapter

Year of Publication Title


R. R. Sathya Narayanan, Srinivasulu, T., Kaul, C., Narendran, A., Sharma, A., Ghosh, J., Acharjee, N., and Dr. Kaustav Bhowmick, “Dimensional Modification Induced Band Gap Tuning in 2D-Photonic Crystal for Advanced Communication and Other Application”, in Ubiquitous Communications and Network Computing, Springer Lecture Notes, vol. 218, N. Kumar and Thakre, A., Eds. Cham: Springer International Publishing, 2018.[Abstract]

We present a systematic simulation study of dimension-induced photonic band-gap tuning in two-dimensional (2-D), hexagonal lattice photonic crystals, consisting of air-holes in dielectric slabs. Photonic crystals are interesting candidates for application in various fields e.g. communication ranging from optical to THz regime, sensing, spectroscopy, imaging etc., using their property to trap and harness light and to produce high-Q resonances by the principle of localization and photonic bandgap formation. The insensitivity towards launched light wavelength shown herein by the bandgap response of a given 2-D planar photonic crystal is promising for enabling cheaper visible or NIR light sources to produce desired response in Mid-IR wavelengths with ease. The structures and material studied lie within the range of popular fabrication methodology. The results show that silicon photonic crystals, operated at 1.55 µm, can produce sharp resonances and large band transmission in Mid-IR wavelengths (3–5 µm) as well.

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Publication Type: Conference Paper

Year of Publication Title


P. Padmini, Tripathi, S., and Dr. Kaustav Bhowmick, “Sensor based speech production system without use of glottis”, in 2017 International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2017.[Abstract]

The present work proposes a speech production mechanism using source-filter (Vocal tract) model, with the help of sensors placed in the oral cavity to synthesize speech. The speech is produced without involvement of glottis. This is achieved by exciting the articulatory system (Oral cavity) with sensor based input. The proposed system creates a virtual voice for a person who lost his voice due to some disability in vocal tract. The Vocal tract model and articulatory system has been tested with English alphabets (Vowels and consonants) using LabView, which has been validated by perceptual test. The present work mainly focuses on the role of the tongue as speech articulator.

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P. Padmini, Tripathi, S., and Dr. Kaustav Bhowmick, “Identification of correlation between blood relations using speech signal”, in 2017 IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), 2017.[Abstract]

This paper presents a study of how speech features have comparable parameters amongst blood relations. Mel Frequency Cepstral Coefficients (MFCC) has been used for extracting the features of input speech signal, along with vector quantization through modified k-means LBG (Linde, Buzo, and Gray) algorithm are implemented to analyse and estimate the similarity to perform related studies. The study is concentrated on database using 12 families from which voice databases were collected from all users, of different age groups, of each family. The Finding of the study shows a high correlation (Max 95%) between similar genders of the family and low correlation (Min 80%) between dissimilar genders of the family.

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S. Saseendran, Dr. Kaustav Bhowmick, and Sreenivasulu, T., “Design of photonic crystal based demultiplexer for CWDM technology”, in 2017 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS), Bhubaneswar, India, 2017.[Abstract]

We present a silicon 2.5D Photonic crystal based CWDM (Coarse Wavelength Division Multiplexer) design, suitable for fabrication by lithography techniques. Particularly, a 3-channel, near-infrared wavelength range CWDM design has been achieved, with the wavelength spacing in accordance with ITU-T G.694.2 standards, i.e. 20 nm. A hexagonal lattice of holes-in-slab has been used for the design with a L-type drop waveguide. Plane wave expansion and FDTD methods were employed for the design.

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Dr. Kaustav Bhowmick, “ANSYS for fiber-optics and novel photonic glass extrusion”, in 9th ASEAN ANSYS Conference, Singapore, 2013.[Abstract]

A general, three-dimensional, incompressible and non-cavitating model of a glass stack coextrusion was developed and simulated using ANSYS-CFX. The model was used to simulate a core/clad chalcogenide glass-pair coextrusion, previously accomplished towards the first multilayer chalcogenide glass fiber. Experimentally measured essential chalcogenide glass properties like thermal expansion coefficient, were used to define the respective glass material models. A dynamic mesh approach was applied to simulate the transient steps of the extrusion. The dimensions in the resulting structure of the simulated extrudate were compared with experimental results and a very close agreement was obtained. This indicates that such computational fluid dynamics modelling can potentially be used as a predictive tool for complicated fiber-optic structures involving multiple material.

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Dr. Kaustav Bhowmick, Benson, T. M., Boriskina, S. V., Kuhl, U., and Stöckmann, H. J., “Spectral Response and Emission Characteristics of Isolated and Clustered Micro-resonators”, in PIERS 2008, Cambridge, USA., 2008.[Abstract]

Photonic structures with dimensions comparable to the operating wavelength have been studied widely of late, especially the performance of micro-resonators supporting Whispering Gallery modes (WGMs). Coupled assemblies of two or more resonators have also proved of great interest in the optical regime where they have been shown to offer further control over pertinent properties such as Q-factor, modal volume and emission or sensing properties. These coupled resonator structures have been called photonic molecules (PMs) due to the similarity between their mode structure and the electron orbital structure found in the chemical molecules that they resemble in structural geometry. Microwave scale models of optical micro-resonators, excited at microwave frequencies, demonstrate similar resonant features to the corresponding optical structures and so provide an extremely useful experimental tool with which to explore the properties of photonic molecules [1, 2]. Dielectric materials used to fabricate the microwave models are easily available and comparatively inexpensive. Further, the dimensions being in the larger centimetre-scale, the structures can be conveniently fabricated with high precision. In this presentation we describe the results of such microwave-scale experiments to determine the resonant and directional emission properties of (i) single resonators with various geometries, including notched microdisk resonators [3], and (ii) an assortment of geometrical arrangements of similar and dissimilar (size-mismatched) microresonators.
Comparisons are made with the predictions of numerical simulations based on an integral equation analysis.

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International Ph. D. Thesis Co-guided

  • Jun Hui Ho, 2013, “Design, fabrication and assessment of multi-layered optical fibre based on chalcogenide glass,” MSc thesis, University of Nottingham, UK.
    Supervisor: Prof. T. M. Benson
    Co-supervisor: Dr. K. Bhowmick

Professional Body Membership

  • Reviewer for Journal of American Ceramic Society
  • Reviewer for Optical and Quantum Electronics Journal, Springer
  • Member and Chartered Engineer (CEng), Institution of Engineers, India

Amrita Statistics

Tag Lead: Optics and Photonics

  • Photonics Research Laboratory (Amrita School of Engineering Bengaluru): Theoretical research in Photonics, Optical communication, Optical materials, Quantum communication technology, Photonics for energy (Solar cells etc) – Extra facilities: commercial software FDTD from RSoft, with solar cell utility enhancement.
  • Present PhD students: 4
  • * Present MTech student: 1
  • * Present BTech students: 7
    * Students are selected by personal interaction and on the basis of demonstrated learnability. Past students placed in respectable positions and/or pursuing higher studies abroad with scholarships.


  • On-going: Visvesvaraya PhD scheme – Ministry of IT and Electronics, New Delhi
  • Completed: Amrita Seed Grant Project

Course Levels Taken

  • B. Tech., M. Tech., Ph. D. coursework
Faculty Research Interest: