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As far as research publications are concerned, we believe in quality rather than quantity. Our research scholars are encouraged for subjective understanding, careful fabrication process optimizations and experimental observation, and publish only the breakthrough research outcomes. In this page, you may find some of our interesting research publications along with their appropriate download links.

  1. Kumar Piyush, Pawan Kumar Pandit, Ashitosh Velamuri, Arnab Goswami, Janakiraman Viraraghavan, and Bijoy Krishna Das,"Diode-assisted microheaters for programmable photonic integrated circuits" Optics Express, Vol. 34, No. 4 / 09 Feb 2026

  2. Sarad Subhra Bhakat,Kumar Piyush, Chintapalli Sam, Riddhi Goswami,Arnab Goswami,Eloi Marigo Ferrer, Hor Chee Hoong, Ng Chew Yan, and Bijoy Krishna Das,"CMOS Compatible Low-loss Optical Tunnel Vias for 3D Photonic Integration" , IEEE Journal of Seleted Topics in Quantum Electronics, VOL. 32, NO. 2, MARCH/APRIL 2026

  3. Ashitosh Velamuri, Kumar Piyush, Yash Raj, Arnab Goswami, Anandha Padmanabhan, Nitin Ghodaonkar, Dinanath Soni, Janakiraman Virraghavan and Bijoy Krishna Das, "Demonstration and Performance Evaluation of Reconfigurable Multiband Microwave Filters using Programmable Photonic Integrated Circuit" , Photonics Research, Vol. 13, Issue 12, pp. 3341, 2025 [Editor Pick]

  4. Suvarna Parvathy, Pawan Kumar Pandit, and Bijoy Krishna Das, "Silicon microdisc resonator for thermo-optically efficient widely tunable microwave photonic filters" , Optics Letters, Vol. 50, Issue 18, pp. 5590-5593, 2025.

  5. Pranita Kumari Swain, Arnab Goswami, and Bijoy Krishna Das, "An Investigation on Designing Narrow-Linewidth DBR Filters with SiN Waveguides" , IEEE Photonic Technology Letters, Vol. 37, Issue. 17, pp. 981-984, 2025.

  6. Anushka Tiwari, Ashitosh Velamuri, Ram Mohan Rao Boyapati, Arnab Goswami, Enakshi Bhattacharya, and Bijoy Krishna Das, "Widely Tunable Microwave Photonic Oscillator with a High-Q Silicon Nitride Microring Resonator" , IEEE/OPTICA Journal of Lightwave Technology, Vol. 43, Issue. 14, pp. 6589-6604, 2025.

  7. Arnab Goswami, Yash raj and Bijoy Krishna Das, "Four-wave mixing in silicon nanophotonicwaveguides and microring resonators: influence of two-photon absorption" , J. Opt. Microsyst. Vol. 4, Issue. 4, pp. 041404-1-16, 2024, doi: 10.1117/1.JOM.4.4.041404.

  8. Pratyasha Priyadarshini, Arnab Goswami, Bijoy Krishna Das, "Distributed Bragg reflector based resonance filters for silicon photonics: design and demonstration" , J. Opt. Microsyst. Vol. 4, Issue. 4, pp. 041403-1-12, 2024, doi: 10.1117/1.JOM.4.4.041403.

  9. Pratyasha Priyadarshini, Arnab Goswami, Ashitosh Velamuri, and Bijoy Krishna Das, "Distributed Bragg reflector based ASE noise removal pump wavelength filters for futuristic chip-scale quantum photonic circuits" , Opt. Express, Vol. 32, Issue. 16, pp. 27409-27430, 2024

  10. Ashitosh Velamuri and Bijoy Krishna Das, "Programmable Silicon Photonic RF Filters with Symmetric Out-of-Band Rejection" , IEEE/OPTICA Journal of Lightwave Technology, Vol. 42, Issue. 5, pp- 1586-1596, 2024.

  11. Arnab Goswami and Bijoy Krishna Das, "Design and demonstration of an efficient pump rejection filter for silicon photonic applications" , Optics Letters, Vol. 47, Issue. 6, pp. 1474-1477, 2022.

  12. Riddhi Nandi, Arnab Goswami and Bijoy Krishna Das, "Phase Controlled Bistability in Silicon Microring Resonators for Nonlinear Photonics" , IEEE Journal of Selected Topics in Quantum Electronics, Vol. 27, Issue. 2, pp- 6100409-1-6100409-9, 2021.

  13. Sumi R, Nandita DasGupta, and Bijoy Krishna Das, "Integrated optical linear edge filters using apodized sub-wavelength grating waveguides in SOI", IEEE Photonics Technology Letters, Vol. 31, Issue. 17, pp.1449-1452, 2019.

  14. Sumi R, Ramesh K. Gupta, Nandita DasGupta and Bijoy Krishna Das, "Ultra-Broadband Add-Drop Filter/Switch Circuit Using Subwavelength Grating Waveguides", IEEE Journal of Selected Topics in Quantum Electronics, Vol. 25, Issue 3, pp. 8300111-1-8300111-11, 2019.

  15. Ramesh K. Gupta and Bijoy Krishna Das, "Performance analysis of metal-microheater integrated silicon waveguide phase-shifters" , OSA Continuum, Vol. 1, Issue 2, pp. 703-714, 2018.

  16. Parimal Sah and Bijoy Krishna Das, "Photonic bandpass filter characteristics of multimode SOI waveguides integrated with submicron gratings", Applied Optics, Vol. 57, Issue 9, pp. 2277-2281, 2018.

  17. Ramesh K. Gupta, Sujith Chandran and Bijoy Krishna Das, "Wavelength Independent Directional Couplers for Integrated Silicon Photonics", IEEE/OSA  Jounal of Lightwave Technology, Vol. 35, No. 22, pp. 4916-4923, 2017.

  18. Riddhi Nandi, Sreevatsa Kurudi and Bijoy Krishna Das, "Diffusion doped p-i-n/p-n diodes for scalable silicon photonics devices", Proc. of SPIE, Integrated Photonics: Materials, Devices, and Applications IV, Vol. 10249, 102490Q-1-102490Q-12, 2017.

  19. Sujith Chandran, Meenatchi Sundaram, Sreevatsa Kurudi and Bijoy Krishna Das,  "Design and fabrication of surface trimmed silicon-on-insulator waveguide with adiabatic spot-size converters", Applied Optics, Vol. 56, Issue. 9, pp. 1708-1716, 2017.

  20. Ramesh K. Gupta and Bijoy Krishna Das, "Multi-input and multi-output SOI (MIMO-SOI) platform for silicon photonics", CSI Transactions on ICT, Vol. 5, No. 2, pp. 189-193, 2017.

  21. Sujith Chandran, Ramesh K. Gupta and  and Bijoy Krishna Das, "Dispersion Enhanced Critically Coupled Ring Resonator for Wide Range Refractive Index Sensing", IEEE Journal of  Selected Topics in Quantum Electronics, Vol. 23, No. 2, pp. 8200109-1-8200109-9, 2017.

  22. Parimal Sah and Bijoy Krishna Das, "Integrated Optical Rectangular-Edge Filter Devices in SOI", IEEE/OSA Journal of Light Wave Technology, Vol. 35, No. 2, pp. 128-135, 2017.

  23. Bijoy Krishna Das, Nandita DasGupta, Sujith Chandran, Sreevatsa Kurudi, Parimal Sah, R Nandi, Ramesh K, Sumi Radhakrishnan, Shantanu Pal, S Kaushal, Meenatchi Sundaram , Pavadai Sakthivel, Sidharth R, Rashmi Joshi, Harish Sasikumar, Uppu Karthik, Solomon Krubhakar, G R Bhatt, J P George, R K Navalakhe, Narendran R, and I Seethalakshmi, "Silicon Photonics Technology", Ten Years of Research at IIT Madras”, Asian Journal of Physics, Vol. 25, No. 7, pp. 923 – 955, 2016

  24. Saket Kaushal and Bijoy Krishna Das, "Modelling and experimental investigation of an integrated optical microheater in silicon-on-insulator",, Applied Optics, Vol. 55, No.11, pp. 2837-2842, 2016.

  25. Shantanu Pal, Bijoy Krishna Das and Wolfgang Sohler, "Photorefractive damage resistance in Ti:PPLN waveguides with ridge geometry", Applied Physics B: Lasers and Optics, Vol. 120, pp. 737-749, 2015.

  26. Sujith Chandran and Bijoy Krishna Das, "Surface trimming of silicon photonics devices using controlled reactive ion etching chemistry", Photonics and Nanostructures – Fundamentals and Applications, Vol. 15, pp. 32-40, 2015.

  27. Sidharth and Bijoy Krishna Das, "Semi-analytical model of arrayed waveguide grating in SOI using Gaussian beam approximation" , Applied Optics, Vol. 54, pp. 2158-2163, 2015.

  28. Harish, Deepa Venkitesh and Bijoy Krishna Das, "Highly efficient DBR in silicon waveguides with eleventh order diffraction", Proc. of SPIE, pp. 86290H- 86290H, 2013.

  29. Uppu Karthik and Bijoy Krishna Das, "Polarization-independent and dispersion-free integrated optical MZI in SOI substrate for DWDM applications" , Proc. of SPIE, Silicon Photonics VIII, Vol. 8629, pp.862910, 2013.

  30. G.R. Bhatt and Bijoy Krishna Das, "Improvement of polarization extinction in silicon waveguide devices", Optics Communication, Vol. 285, No. 8, pp. 2067-2070, 2012.

  31. G.R. Bhatt, R. Sharma, Uppu Karthik and Bijoy Krishna Das, "Dispersion-free SOI interleaver for DWDM applications" , IEEE/OSA Journal of Lightwave Technology, Vol. 30, No. 1, pp. 140-146, 2012.

  32. I.S. Krubhakar, R. Narendran, and Bijoy Krishna Das, "Design and fabrication of integrated optical 1×8 power splitter in SOI substrate using large cross-section single-mode waveguides", Proc. of SPIE, Vol. 8173, pp. 81730C, 2011.

  33. Shantanu Pal and Bijoy Krishna Das, "Fabrication of ridge waveguide in X-cut LiNbO3  for nonlinear optic applications" , Proc. of SPIE, Vol. 8173, pp. 81730W, 2011.

  34. G.R. Bhatt and Bijoy Krishna Das, "Demonstration of  ITU channel interleaver in SOI with large cross section single mode waveguides", Proc. of SPIE, Vol. 8069, pp. 806904, 2011.

  35. John P. George, Nandita Dasgupta, and Bijoy Krishna Das, "Compact integrated optical directional coupler with large cross section silicon waveguides", Proc. of SPIE, Vol. 7719, pp. 77191X, 2010.

  36. Rupesh Kumar Navalakhe, Nandita DasGupta, and Bijoy Krishna Das, "Fabrication and characterization of straight and compact S-bend optical waveguides on a silicon-on-insulator platform", Applied Optics, Vol. 48, No. 31, pp. G125-G130, 2009.

  1. Riddhi Goswami, Anushka Tiwari, Sarad Subhra Bhakat, Shamsul Hassan, Wee Ching Hwa, Hor Chee Hoong, Ng Chew Yan, and Bijoy Krishna Das,"Designing Compact and Low-loss Optical Delay-lines in Silicon Photonics Platform "  Poster Presentation, ECIO, Switzerland, 15th-17th June, 26

  2. Pawan Kumar Pandit, Kumar Piyush, Ram Mohan Rao Boyapati, Yusman Bin Mohd. Yusof, Hor Chee Hoong, Ng Chew Yan, and Bijoy Krishna Das,"Si-Ge Heterostructure Bipolar Transistors in Silicon Photonics Platform " Oral Presentation, ECIO ETH Zurich, Switzerland, 14th-17th June, 26

  3. Sarad Subhra Bhakat, Anjana James, Riddhi Goswami, Kumar Piyush, Shamsul Hassan, Eloi Marigo Ferrer, Hor Chee Hoong, Ng Chew Yan, and Bijoy Krishna Das,"Robust Design of a Low-Loss Vertical Coupler Between Single-Mode Si and SiN Waveguides " Poster Presentation, ECIO, ETH Zurich, Switzerland, 15th-17th June 26

  4. Anjana James, Yash Raj, Arnab Goswami, Pranjal Singh Tomar, Deleep Nair, Bijoy Krishna Das and Anjan Chakravorty,"Coupled Mode Theory Equivalent Circuit Model for Distributed Bragg Reflectors" Poster Presentation, ECIO, Switzerland, 15th-17th June, 26

  5. Pawan Kumar Pandit, Suvarna Parvathy K V, Rammohan Boyapati,Anjana James, D. Sahu, Arnab Goswami, Chee Hoong Hor, Chew Yan Ng, Deleep Nair, Anjan Chakravorty and Bijoy Krishna Das,"Optoelectronic Mixing of Micro/mm-wave Frequencies in Silicon Photonics Ge-Photodiodes" Oral Presentation, CLEO, USA, 17th-21st May, 26

  6. Yash Raj, P.K Swain, Arnab Goswami, Chee Hoong Hor, Chew Yan Ng and Bijoy Krishna Das,"Evaluation of Silicon Photonics Wafer-Scale Manufacturing Variability using DBR Filters"  Poster Presentation, CLEO, USA, 17th-21st May, 26

  7. Boyapati Rammohan, Sarad subhra Bhakat, Ankan Gayen, Chee Hoong Hor, Chew Yan Ng and Bijoy Krishna Das,"Single-Mode TE-Pass Waveguide Filter for Silicon Photonics Chips with Edge couplers" , Poster Presentation, CLEO, USA, 17th-21st May, 26

  8. Anjana James, Pawan Kumar Pandit, Arnab Goswami, Shamsul Hassan, Deleep Nair, Bijoy Krishna Das and Anjan Chakravorty, "Compact Modeling of Ge-on-Si Waveguide Photodetector Operating in Optical C-Band", Oral Presentation, IEEE ICEE, Bangalore, 13th-16th Dec, 25.

  9. Kumar Piyush, Siddhartha Chaganti1, Manu Maxim B R, Shamsul Hassan, Arnab Goswami, Yusman M Yusof, Ng Chew Yan, Deleep Nair, Bijoy Krishna Das and Anjan Chakravorty, "Compact Modeling of Lateral-Gate Transistors for Co-Integrated Electronics in Si-Photonic Platforms", Oral Presentation, IEEE ICEE, Bangalore, 13th-16th Dec, 25.

  10. Anushka Tiwari, Ashitosh Velamuri, Arnab Goswami and Bijoy Krishna Das, "Signal Power Dependant Performance of SiN Resonator Based Microwave Photonic Filters", Oral Presentation, IEEE IPC, Singapore, 9th-13th Nov 2025

  11. Sarad Subhra Bhakat, Kumar Piyush, Riddhi Goswami, Arnab Goswami, Marigo Eloi Ferrer, Gan Yih Loong,Ng Chew Yan, and Bijoy Krishna Das, "Compact Design of Low-Loss Optical Vias for 3DSilicon Photonic Integrated Circuits", Poster, IEEE IPC, Singapore, 9th-13th Nov 2025

  12. Suvarna Parvathy, Pawan Kumar pandit and Bijoy Krishna Das, " A Compact High-Q Microdisc Resonator for Widely Tunable Microwave Filters", Oral Presentation, European Conference on Integrated Optics (ECIO), The Cardiff University, UK,  10th  June- 12th  June, 2025.

  13. Ashitosh Velamuri, Anandha Padmanabhan, Nitin Ghodgaonkar, Dinanath Soni, Arnab Goswami and Bijoy Krishna Das, "Chip-Scale Demonstration of Tunable Two-Band Microwave Photonic Filter using Cascaded Microring Resonators" , Postdeadline Paper, 16th International Conference on Fiber Optics and Photonics - 2024, IIT Kharagpur, India,  12th  Dec- 15th  Dec, 2024.

  14. Kumar Piyush, Pawan Kumar Pandit, Ashitosh Velamuri, Arnab Goswami, Anandha Padmanabhan, Nitin Ghodgaonkar, Dinanath Soni, Janakiraman Viraraghavan and Bijoy Krishna Das, "Efficient Tuning of Silicon Photonic Power Splitters using Diode Integrated Microheaters" , Oral Presentation, 16th International Conference on Fiber Optics and Photonics - 2024, IIT Kharagpur, India,  12th  Dec- 15th  Dec, 2024.

  15. Shruti Pandey, Tarun Arumugham, Anjana James, Ashitosh Velamuri, Arnab Goswami, Gan Yih Loong, Ng Chew Yan, Deleep R Nair, Anjan Chakravorty, Bijoy Krishna Das, "Extraction of Silicon Photonic Wafer-Scale Process Variability Using ML-Enhanced Algorithm" , Oral Presentation, Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), Incheon, Republic of Korea,  04th  Aug- 09th  Aug, 2024.

  16. Kumar Piyush, Yash Raj, Akash Shekhar, Ashitosh Velamuri, Arnab Goswami, Naveen Raj Murugesan, Anandha Padmanabhan, Dinanath Soni, Janakiraman Viraraghavan, Bijoy Krishna Das, "Estimation of Local Phase Errors in Silicon Photonic MZI Mesh from Passive Measurements" , Oral Presentation, Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), Incheon, Republic of Korea,  04th  Aug- 09th  Aug, 2024.

  17. Arnab Goswami, Pratyasha Priyadarshini, Gan Yih Loong, Ng Chew Yan, Deleep Nair, Anjan Chakravorty, Bijoy Krishna Das, " Silicon Photonic Wafer-Scale Yield of Single Mode Resonator with Broadband DBR Mirrors" , Poster Presentation, European Conference on Integrated Optics, Aachen, Germany,  17th  June- 19th  June, 2024.

  18. Arnab Goswami, Anushka Tiwari, Riddhi Goswami, Sarad Subhra Bhakat, Enakshi Bhattacharya and Bijoy Krishna Das, " SiN Photonic Integrated Circuit for Pump Laser Suppressed Nonlinear Signal Generations" , Poster Presentation, IEEE Silicon Photonics 2024, Tokyo, Japan,  15th  April- 18th  April, 2024.

  19. Pranita Kumari Swain, Arnab Goswami, Anushka Tiwari, Riddhi Goswami, Sarad Subhra Bhakat, Enakshi Bhattacharya and Bijoy Krishna Das, " Cladding Modulated Distributed Bragg Filters in Single Mode Silicon Nitride Waveguide" , Poster Presentation, IEEE Silicon Photonics 2024, Tokyo, Japan,  15th  April- 18th  April, 2024.

  20. Anushka Tiwari, Ashitosh Velamuri, Arnab Goswami, Deepa Venkitesh, Enakshi Bhattacharya and Bijoy Krishna Das, "A Compact and High-Q value SiN Microring Resonator for Microwave Photonic Applications" , Poster Presentation, IEEE Silicon Photonics 2024, Tokyo, Japan,  15th  April- 18th  April, 2024.

  21. Ashitosh Velamuri and Bijoy Krishna Das, "Integrated Photonic Microring Resonator for FSR Dependent Microwave Bandpass Filters" , Oral Presentation, OFC 2024, San Diego, California, USA,  24th  March- 28th  March, 2024.

  22. Arnab Goswami, Ram Mohan Rao Boyapati and Bijoy Krishna Das, "Bistable Photon Pair Generation in Silicon Microring Resonator Integrated with Pump Rejection Filter" , Oral Presentation, IEEE EDTM 2024, Bangalore, India  3rd  March-6th  March, 2024.

  23. Ankan Gayen, Nagarajan Nallusamy, Gowtham Ezhilarasu, Shamsul Hassan, Vinoth Subramanian, Kumar Piyush, Arnab Goswami and Bijoy Krishna Das, "A Robust and Low-cost Fiber-optic Array Attachment Solution for Silicon Photonics Chips with Large Number of Input/Output Channels" , Poster Presentation, IEEE EDTM 2024, Bangalore, India  3rd  March- 6th  March, 2024.

  24. Arnab Goswami, Riddhi Goswami, Janakiraman Viraraghavan and Bijoy Krishna Das, " Programmable Silicon Photonic Microring Resonator for Nonlinear Applications" , Oral Presentation, Advanced Photonics Congress 2023, Busan, South Korea,  9th  July- 13th  July, 2023.


  25. Suvarna Parvathy K V, Arnab Goswami and Bijoy Krishna Das, " Temperature Dependent Performance Analysis Near Critical Coupling : Microdisc versus Microring Resonators" , Poster Presentation, Advanced Photonics Congress 2023, Busan, South Korea,  9th  July- 13th  July, 2023.


  26. Ashitosh Velamuri and Bijoy Krishna Das, " Integrated Programmable Microwave Photonic Bandpass Filter with Symmetric Rejection ", Poster Presentation, CLEO 2023, San Jose,California, United States,  7th  May- 12th  May, 2023.


  27. Pratyasha Priyadarshini, Arnab Goswami, Ashitosh Velamuri and Bijoy Krishna Das, " Thermo-optically Tunable DBR Resonator with Ultra-broad Rejection Band for Silicon Photonic Applications ", Oral Presentation, European Conference on Integrated Optics 2023, Enschede, The Netherlands,  19th  April- 21st  April, 2023.


  28. Anushka Tiwari, Sarad Subhra Bhakat, Riddhi Goswami, Pranita Kumari Swain, Arnab Goswami, Enakshi Bhattacharya and Bijoy Krishna Das, " In-house SiN process development for integrated photonic applications " , Oral Presentation, International Conference on Emerging Electronics (ICEE) 2022, Bengaluru, India,  11th  December- 14th  December, 2022.


  29. Pratyasha Priyadarshini, Arnab Goswami and Bijoy Krishna Das, "Flat-top and High Shape Factor DBR Based Resonant Filters for Integrated Silicon Photonics ", Poster Presentation, Frontiers in Optics 2022, Rochester, New York, United States,  17th  October- 20th  October, 2022.


  30. Ashitosh Velamuri and Bijoy Krishna Das, "Accurate Measurement of Optical Delay in a Programmable Microring Resonator " , Poster Presentation, Frontiers in Optics 2022, Rochester, New York, United States,  17th  October- 20th  October, 2022.


  31. Riddhi Nandi, Arnab Goswami and Bijoy Krishna Das, "Electrically Controlled Bistability in Microring Resonators for Nonlinear Photonic Applications", Poster Presentation, CLEO – Pacific Rim – 2020, Sydney, Australia,  3rd  August- 5th  August, 2020.

    32. >
  32. Arnab Goswami and Bijoy Krishna Das, "High Extinction Pump Rejection Bragg Filters for Silicon Quantum Photonic Devices" , Oral Presentation, CLEO – 2020, San  Jose, California, 11th May- 15th  May, 2020.

  33. Arnab Goswami and Bijoy Krishna Das, “Efficient Four Wave Mixing in a Silicon Photonic Wire Waveguide and Resonator” , Oral Presentation, International conference on optics and electro-optics (ICOL-2019) (XLIII Symposium of Optical Society of India); Instruments Research  Development Establishment Dehradun, Uttarakhand, India,19-22 October 2019.

  34.  Shivani  Sharma,  Arnab  Goswami,  Joyee  Ghosh,  Vivek  Venkataraman,  Bijoy  Krishna  Das,  “Telecom-band wavelength Conversion in Air-clad Silicon Waveguides” , Poster Presentation, International conference on optics and electro-optics (ICOL-2019) (XLIII Symposium of Optical Society of India); Instruments Research  Development Establishment Dehradun, Uttarakhand, India, 19-22 October 2019.

  35. Riddhi Nandi, Ramesh K. Gupta and Bijoy Krishna Das, "Thermo-optic Tuning of Microing Resonators using Diffusion Doped Microheaters in SOI"  , Poster Presentation, 14th International Conference on Fiber Optics and Photonics, IIT Delhi, India, 12-15 December  2018.

  36. B Meena, Sumi Radhakrishnan, and Bijoy Krishna Das, “Fabry-Perot Cavity Resonances in Apodized Sub-Wavelength Grating Waveguides”, Poster Presentation, 14th International Conference on Fiber Optics and Photonics, IIT Delhi, India , 12-15 December  2018.

  37. Ramesh K. Gupta and Bijoy Krishna Das, "Wideband MZI based Thermo-Optic Switch with Slab Integrated Microheater in SOI" , Poster Presentation, CLEO – 2018, Hong Kong, 29th July- 3rd  August, 2018.

  38.  Sumi Radhakrishnan, Nandita Dasgupta and Bijoy Krishna Das, "�Integrated optical Edge Filter using Apodized Sub – Wavelength Grating Waveguide in SOI" , Poster Presentation, ECIO – 2018, Valencia, Spain, 30th May-1st June, 2018.

  39. Sumi Radhakrishnan, Ramesh K Gupta, Nandita DasGupta and Bijoy Krishna Das, "Integrated Optical Ultra-Broadband Add-Drop Filter in Silicon-On-Insulator Platform", Oral OFC 2018, San Diego, USA, 11th -15th  March 2018.

  40. Ramesh K. Gupta and Bijoy Krishna Das, "Integrated Silicon Photonics Directional Couplers for WDM Applications", Oral Presentation, ICMAP-2018, IIT Dhanbad, 9-11 February 2018.

  41. Riddhi Nandi and Bijoy Krishna Das, "Polarization Dependent Electro-Optic Effect in SOI Waveguides with Laterally Diffused P-N Junction", Oral Presentation, ICMAP-2018, IIT Dhanbad, 9-11 February 2018.

  42. Sreevatsa Kurudi, Riddhi Nandi and Bijoy Krishna Das, "Scaling of Silicon PIN Waveguide Photodetector at 1550 nm Wavelength", Poster Presentation, IWPSD – 2017, IIT Delhi, India (11-15 December, 2017).

  43. Meenatchi Sundaram S, Sujith Chandran and Bijoy Krishna Das, "Loss Estimation of Adiabatically Tapered Silicon Waveguides" , Oral Presentation, ICAOP-2017 (41st OSI), Hisar, India (23-26 November 2017).

  44. Parimal Sah and Bijoy Krishna Das, "Integrated Optical λ/4 Phase-Shifted High-Q DBR Cavity in Silicon-On-Insulator", Oral Presentation, ICAOP-2017 (41st OSI), Hisar, India (23-26 November 2017).

  45. Sumi Radhakrishnan, Nandita DasGupta and Bijoy Krishna Das, "Integrated Optical Mach-Zehnder Interferometer with Sensing Arm of Sub-Wavelength Grating Waveguide in SOI", Poster Presentation, IEEE Sensors – 2017, Glasgow, Scotland, UK (29th October – 1st November, 2017).

  46. Riddhi Nandi, Sreevatsa Kurudi and Bijoy Krishna Das, "Diffusion doped p-i-n/p-n diodes for scalable silicon photonics devices", Poster presentation, SPIE Microtechnologies, Barcelona, Spain (8 – 10 May 2017).

  47. Parimal Sah and Bijoy Krishna Das, "Broadband wavelength filter device using a sidewall grating in multimode SOI rib waveguide"  , Oral Presentation in OFC 2017, Los Angeles, CA, USA (19-23 March 2017) .

  48. Sumi Radhakrishnan, Nandita DasGupta and Bijoy Krishna Das, "Demonstration of integrated optical 2D photonic crystal waveguides in SOI for sensing applications" , Oral Presentation, 13th International Conference on Fibre Optics and Photonics, IIT Kanpur, India (4-8 December 2016).

  49. Sreevatsa Kurudi and Bijoy Krishna Das, "Design and demonstration of polarization independent variable optical attenuator with SOI waveguides", Oral Presentation, 13th International Conference on Fibre Optics and Photonics, IIT Kanpur, India (4-8 December 2016) 

  50. Bijoy Krishna Das, "Silicon Photonics for High-Speed Optical Interconnects", General Talk – 2,2nd URSI Regional Conference on Radio Science (URSI-RCRS 2015),New Delhi, India (16-19 Nov. 2015) .

  51. Saket Kaushal and Bijoy Krishna Das, "Design of maximally flat delay lines using apodized CROW structure in SOI", 12th International Conference on Fibre Optics and Photonics, Kharagpur, India (13-16 December 2014) .

  52. Sidharth Ravindran and Bijoy Krishna Das, "Modeling and Phase Error Analysis of AWG in SOI using Gaussian Beam Approximation", 12th International Conference on Fibre Optics and Photonics, Kharagpur, India (13-16 December 2014 )

  53. Sujith Chandran, Saket Kaushal, Parimal Sah and Bijoy Krishna Das, "Nanoscale Tolerance for Silicon Optical Interconnect Devices" ,Invited Talk, National Conference on Nanoscience and Nanotechnology (NS&NT – 2014), CRNN, University of Calcutta, Kolkata (18-19 September 2014).

  54. Sujith Chandran, Saket Kaushal and Bijoy Krishna Das, "Optical Interconnect devices with scalable waveguide cross-sections in SOI platform", Invited Talk, ICOL-2014, Dehradun, India (5-8 March 2014) .

  55. Sidharth Ravindran and Bijoy Krishna Das, "Design and fabrication of 8-channel AWGs with 2-µm-SOI for optical interconnects", SPIE Photonics West 2014, San Francisco, CA, USA (1-6 February 2014).

  56. Sujith Chandran, Saket Kaushal and Bijoy Krishna Das, "Monolithic integration of micron to submicron waveguides with 2D mode-size converters in SOI platform" , Invited Talk, SPIE Photonics West 2014, San Francisco, CA, USA (1-6 February 2014).

  57. Rashmi Joshi, Nandita DasGupta and Bijoy Krishna Das, "Design of 2D Photonic crystals for integrated optical slow light applications", IWPSD-2013, Noida, India (Dec 2013).

  58. I. Seethalakshmi, Rashmi Joshi, Nandita DasGupta and Bijoy Krishna Das, "Inductively coupled plasma etching of GaAs with high anisotropy for photonics applications" , IWPSD-2013, Noida, India (Dec 2013).

  59. Pavadai Sakthivel, Nandita Dasgupta and Bijoy Krishna Das, "Simulation and experimental studies of diffusion doped p-i-n structures for silicon photonics", SPIE Photonics West 2013, San Francisco, CA, USA (2-7 February 2013)

  60. Uppu Karthik and Bijoy Krishna Das, "Polarization-independent and dispersion-free integrated optical MZI in SOI substrate for DWDM applications", SPIE Photonics West 2013, San Francisco, CA, USA (2-7 February 2013)

  61. Harish Sasikumar, Deepa Venkitesh and Bijoy Krishna Das, "Highly efficient DBR in silicon waveguides with eleventh order diffraction", SPIE Photonics West 2013, San Francisco, CA, USA (2-7 February 2013)

  62. Sujith Chandran and Bijoy Krishna Das, "Tapering and Size Reduction of Single-mode Silicon Waveguides by maskless RIE", OECC 2012 – Optoelectronics Communication Conference, Bexco, Busan Korea, (02-06, July ,2012).

  63. G.R. Bhatt and Bijoy Krishna Das, "Demonstration of ITU channel interleaver in SOI with large cross section single mode waveguides", SPIE Microtechnologies, Prague, Czech Republic (18-20 April 2011).

  64. G.R. Bhatt, P.V. Vivek and Bijoy Krishna Das, "Attenuation of TM polarized light in metal coated SOI rib waveguides due to plasmonic absorption", Photonics 2010-International Conference on Fiber Optics and Photonics, Guwahati, India,  (12 – 15 December 2010).

  65. I. Solomon Krubhakar, R. Narendran, Y.K. Karthik and Bijoy Krishna Das, "Fabrication of 1X8 power splitter in SOI substrate with optimized design parameters", Photonics 2010-International Conference on Fiber Optics and Photonics, Guwahati, India (12 – 15 December 2010).

  66. Shantanu Pal and Bijoy Krishna Das, "Fabrication of ridge waveguide in X-cut lithium niobate for nonlinear optic applications", Photonics 2010-International Conference on Fiber Optics and Photonics, Guwahati, India,  (12 – 15 December 2010).

  67. John P. George, Nandita Dasgupta and Bijoy Krishna Das, "Compact Integrated Optical Directional Coupler with Large Cross Section Silicon Waveguides", Photonics Europe (SPIE), Brussels, Belgium (12 – 16 April 2010).

  68. John P. George, A. Manjusha and Bijoy Krishna Das, "Silicon Nitride ARC for SOI Integrated Optical Devices", IWPSD-2009 XVth International Workshop on Physics of Semiconductor Devices, New Delhi, India (15 – 19  December  2009).

  69. K. Rajneesh, Shantanu Pal and Bijoy Krishna Das, "Fabrication and Characterization of Integrated Optical TE-Pass Polarizer in LiNbO3", ICOP-2009 International Conference on Optics and Photonics, Chandigarh, India (30 October –  1 November 2009).

  1. “Material Platforms for Integrated Photonics and CPPICS Overview“ , ICAM 2025, St. Josephs Collge, Trichy, India, 30-31 January, 2025 (Talk given by Dr. Nagarajan Nallusamy). 

  2. “Silicon Photonics Enabled Quantum Circuits and Systems (SPEQCS): Prospects and Challenges“, Symposium on Quantum Computing and Artificial Intelligence, CDAC Pune, India, 29-30 January 2025. 

  3. “DBR Filters for Silicon Quantum Photonic Integrated Circuits“ , Photonics-2024, IIT Kharagpur, India, 12-15 December, 2024. 

  4. “On-Chip Filters for Silicon Photonics Enabled Quantum Circuits & Systems (SPEQCS)“ ,OSI-OPTOIn-2024, Chandigarh, India, 24 October 2024. 

  5. “Silicon Photonics technology and applications “, IEEE NUSOD, New Delhi, India, 23-26 September, 2024. 

  6. “Silicon Photonics Technology at CoE-CPPICS, IIT Madras“ ,(ICOS) EU-India Joint Researchers Workshop on Semiconductors, Brussels, Belgium, 9 October, 2024. 

  7. “Silicon Photonics: Technology & Applications“, NSRTC-WPU, Pune, India, 20 July, 2024.  

  8. “Silicon Photonics: Technology & Applications“, SSPL, New Delhi, India, 04 July, 2024. 

  9. “Distributed Bragg Filters and Resonators for Silicon Quantum Photonic Circuits“, IMEC, Belgium, 29 April, 2024. 

  10. “Distributed Bragg Filters and Resonators for Silicon Quantum Photonic Circuits“, Photonics Lecture, Paderborn University, Germany, 24 April, 2024. 

  11. “Special Filters for Silicon Photonic Integrated Circuits “, PHOTONICS 2023, Bangaluru, India, 5-8 July, 2023. 

  12. “State-of-the-art technology and performance analysis of thermo-optic microheaters for silicon photonics applications “, 4th IEEE-ICEE, Bengaluru, India, 16-19 December, 2018. 

  13. “Thermo-Optic Phase-Shifters for Silicon Photonic Integrated Circuit, 14th International Conference on Fiber Optics and Photonics, IIT Delhi, India, 12-15 December, 2018.

  14. “Design and modeling of thermo-optic phase-shifters for integrated silicon photonics“, OSI-ISO 2018, International Symposium on Optics, IIT Kanpur, India, 2 September, 2018.

  15. “Thermo-Optically Tunable Silicon Photonics Devices“, ICMAP-2018, IIT Dhanbad, 9-11 February, 2018.

  16. “Silicon Photonics Devices with Ultra-Broad Optical Bandwidth“, IEEE WRAP-2017, Hyderabad, India, 18-19 December, 2017.

  17. B“Silicon Photonics: Technology and Applications“, ICAOP-2017 (41st OSI), Hisar, India, 23-26 November 2017.

  18. “Integrated 1D Photonic Crystal Devices with SOI Waveguides“, Symposium on Photonic Crystal: 30 Years of Photonic Crystals – the Indian Scenario, IIT Kanpur, 21-23 September,2017 .

  19. “Novel Wavelength Filter Devices in SOI for Optical Interconnect Applications“, ICMAT-2017, Suntec Singapore, 18-23 June, 2017.

  20. “Novel wavelength filter devices in SOI for sensing applications“, 13th International Conference on Fibre Optics and Photonics, IIT Kanpur, India, 4-8 December, 2016.

  21. “Active Phase-Shifters for Silicon Photonics“, Frontier in Light Matter Interaction (FiLMI – 2016), IIT Ropar, 4-6 March, 2016.

  22. “MIMO Platform for Silicon Photonics”, 2nd International Conference on Emerging Technologies : Micro to Nano (ETMN 2015), Jaipur, India, 24-15 October, 2015.

  23. “Compact Wavelength-Selective Switch Circuit for Integrated Optical Interconnect“, 12th International Conference on Fibre Optics and Photonics, Kharagpur, India  13-16 December, 2014.

  24. “Nanoscale Tolerance for Silicon Optical Interconnect Devices”, TU9-IIT Mandi Collaborative Workshop on Emerging Semiconductor Technologies, 26-27 September, 2014.

  25. “Optical Interconnect Devices in SOI Platform – Past, Present and The Future”, PAOMP 2014, Bhubaneswar, 26-28 March, 2014.

  26. “Monolithic integration of micron to submicron waveguides with 2D mode-size converters in SOI platform“, SPIE Photonics West 2014, San Francisco, CA, USA, 1-6 February, 2014 ( talk given by Sujith).

  27. “Silicon Photonics: Monolithic Integration of Micron to Sub-micron Waveguide Devices”, Focused Discussion Meeting on Metamaterials and Photonics Nanostructures“, IIT Kanpur, India, 16 – 17 August, 2013.

  28. “Silicon Photonics and Optical interconnect Technology“, ICOE – International Conference on Optical Engineering 2012,VTU, Belgaum, India, 26-28 July, 2012.

  29. “Prospect of Silicon Photonics without CMOS Technology”, Annual Photonics Workshop, CUSAT, Kochi, India,27 – 28 February, 2012.

  30. “Research Advances in SOI Based Waveguide Sensors“, IConTOP – Trends in Optics and Photonics II, Kolkatta, India,7-9 December  2011.

  31. “Silicon Photonics in SOI Platform: Problems with Waveguide dispersion and Birefringence Effects”, FOP 11 – Frontiers in Optics and Photonics, XXXVI OSI Symposium, New Delhi, India, 3-5 December  2011.

  32. “Advances in Silicon Photonics Research: The World Scenario and IIT Madras,”  ICCCD, Kharagpur, India 10 – 12, December 2010.

  33. “Integrated Optical Devices for Sensor Applications“, Workshop on Applications of Lasers in Sensing and Measurements, Chennai, India, 14 – 19 July, 2008.

  1. Bijoy Krishna Das, Deleep Ramachandran Nair, Anjan Chakravorty, Pawan Kumar Pandit, Suvarna Parvathy K V, Anushka Tiwari, Ram Mohan Rao Boyapati, Anjana James, Dibyanchal Sahu, and Arnab Goswami, “Method For Optoelectronic Mixing Of Radio Frequencies In Silicon Waveguide Integrated Germanium Photodiode", Indian Patent Application No. 202641092177, Dated 29/07/2026 (filed).

  2. Bijoy Krishna Das, Pawan Kumar Pandit, Ram Mohan Rao Boyapati and Kumar Piyush, “Silicon-Germanium Heterostructures Bipolar Junction Transistor (BJT) In Silicoc Photonic Platform", Indian Patent Application No. 202641081667, Dated 02/07/2026 (filed).

  3. Bijoy Krishna Das, Deleep Ramachandran Nair, Anjan Chakravorty, Pawan Kumar Pandit, Anushka Tiwari, Suvarna Parvathy K V, Ram Mohan Rao Boyapati, Anjana James and Arnab Goswami, “System And Method For Radio Frequency Mixing Using A Chip-scale Photonic Integrated Circuit", Indian Patent Application No. 202641041368, Dated 31/03/2026 (filed).

  4. Bijoy Krishna Das, Ram Mohan Rao Boyapati, Kumar Piyush and Arnab Goswami, “Photonic Integrated Circuit and Method for Multiprotocol Quantum Key Distribution", Indian Patent Application No. 202641008276, Dated 28/01/2026 (filed).

  5. Bijoy Krishna Das, Anjan Chakravorty, Deleep Ramachandran Nair, Shruti Pandey and Arnab Goswami, “Equivalent Circuit Model for Simulating Photonic Directional Couplers", Indian Patent Application No. 202541130961, Dated 23/12/2025 (filed).

  6. Bijoy Krishna Das, Janakiraman Viraraghavan, Kumar Piyush, Riddhi Goswami, Sarad Subhra Bhakat, Anushka Tiwari, Ram Mohan Rao Boyapati, Pawan Kumar Pandit, Arnab Goswami, “Multipurpose Programmable Photonic Processor Based on a Modified Square-Mesh Architecture", Provisional Indian Patent Application No. 202541125488, Dated 11/12/2025 (filed).

  7. Bijoy Krishna Das, Ankan Gayen, Shamsul Hassan, Nagarajan Nallusamy, Kumar Piyush, Kavimani A and Arnab Goswami “Real-Time High-Speed Multi-Channel Quantum Random Number Generation System and Method Therefor”, [Application No.: 202541068346] has been published on the Indian Patent Office (IPO) on 05/12/2025, in Official Journal No. 49/2025.

  8. Bijoy Krishna Das, Anjan Chakravorty, Deleep Ramachandran Nair, Shruti Pandey and Arnab Goswami, “Circuitry for simulating transmission phase delay and loss for photonic waveguide”, Indian Patent Application No. 202541088992, Dated 22/09/2025.

  9. Bijoy Krishna Das, Anushka Tiwari, Pawan Kumar Pandit, Ridhhi Goswami, Ram Mohan Rao Boyapati, Kumar Piyush, Pawan Kumar Pandit, Sarad Subhra Bhakat, Suvarna Parvathy K V and Arnab Goswami, “System and method for operating a chip-scale microwave photonic scaning receiver”, Patent App.No. 202541088992, Dated 18/09/2025 (filed).

  10. Bijoy Krishna Das, Sarad Subhra Bhakat, Kumar Piyush, Riddhi Goswami, Chintapalli Sam, Arnab Goswami, Marigio Eloi Ferrer, Hor Chee Hoong and Ng Chew Yan, “Optical Tunneling Via For A 3D Photonic Integrated Circuit And Method Of Fabricating The Same”, Indian Patent Application No. 202541079043, Dated 20/08/2025 (filed), and also patent filed in Taiwan Application No. 115133528, Dated 20/08/2026 (filed)

  11. Bijoy Krishna Das, Janakiraman Viraraghavan, Kumar Piyush, Pawan Kumar Pandit, Ashitosh Venkatasai Velamuri, Arnab Goswami, “A Device for Diode-Assisted Phase Shifting in Photonic Integrated Circuits”, Provisional Indian Patent Application No. 202541079075, Dated 20/08/2025 (filed).

  12. Anushka Tiwari, Ashitosh Velamuri, Ram Mohan Rao Boyapati, Pranita Kumari Swain, Suvarna Parthy K V, Pawan Kumar Pandit, Sarad Subhra Bhakat, Arnab Goswami, and Bijoy Krishna Das, “Chip-Scale and Tunable Microwave Photonic Oscillator”, Patent App.No. 202541038736, Dated 22/04/2025 (filed).

  13. Ankan Gayen, Nagarajan Nallusamy, Goutham Ezhilarasu, Shamsul Hassan, Vinoth Subramanian, Arnab Goswami and Bijoy Krishna Das, “System and method for attaching optical fiber array modules to photonic chips”, Indian Patent Grant No.566248, Dated of Grand - 14th May 2025.

  14. Pratyasha Priyadarshini, Arnab Goswami and Bijoy Krishna Das, “A system and method for anultra-compact DBR cavity design for photonics technology applications”, Application No. 202241075651, Dated 26-12-2022.

  15. Sujith Chandran, Subramanian Meenatchi Sundaram and Bijoy Krishna Das, “Method and apparatus for modifying dimensions of a waveguide”, Indian Patent No. 469080 (Published on 23-07-2015), US Patent No. US10168479B2 (Published on 01-01-2019) https://patents.google.com/patent/US10168479B2/en

  16. Parimal Sah and Bijoy Krishna Das, “Design and implementation of an integrated optical razor-edge filter in silicon-on-insulator”, Patent No. IN201641031641A, Published on 23-03-2018.

  1. Arnab Goswami, Shamsul Hassan, Nagarajan Nallusamy and Bijoy Krishna Das, " Chapter-4: Material platforms for integrated photonics" , On-Chip Photonics Principles, Technology and Applications, Pages 91-131, 2024.


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