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K. Thyagarajan

Indian Institute of Technology Delhi

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Prof. K. Thyagarajan
Professor, Department of Physics
Indian Institute of Technology Delhi
Office: MS436
E-mail:hod[at]physics.iitd.ac.in,
ktrajan[at]physics.iitd.ac.in,
krishna.thyagarajan[at]yahoo.com
Tel:91-11-26596529 (O),
91-11-26591328 (W),
91-11-26591930 (H),
91-11-26581549 (H),
Fax: 91-11-26581114

List of publications (since 2000)

  1. A novel design of an intrinsically gain flattened erbium doped fiber, K. Thyagarajan and Jagneet Kaur, Optics Communications, 183 (2000) 407-413.
  2. -1800 ps/km-nm Chromatic dispersion at 1.55 m in a dual concentric core fiber, J L Auguste, R Jindal, J M Blondy, M Clapeau, J Marcou, B Dussardier, G Monnom, D B Ostrowsky, B P Pal and K Thyagarajan, Electronics Letters, 36 (2000) 1689-1691.
  3. Dispersion compensation in transmission using uniform long period fiber gratings, Mini Das and K. Thyagarajan, Optics Communications, 190 (2001) 159-163.
  4. A dispersion flattening dispersion compensating fiber design for broadband dispersion compensation, P. Palai, R. K. Varshney and K. Thyagarajan, Fiber and Integrated Optics, 20 (2001) 21-28.
  5. Parametric amplification studies in 4-layered qpm leaky waveguides, Minu Vaya, K. Thyagarajan and Arun Kumar, Fiber and Integrated Optics, 20 (2001) 367-376.
  6. Nonlinear phase shift studies using parametric amplification in 4-layered qpm leaky waveguides, Minu Vaya, K. Thyagarajan and Arun Kumar, Fiber and Integrated Optics, 20 (2001) 377-384.
  7. Characterization and simulation of long period gratings fabricated using electric discharge, Parthasarathy Palai, M N Satyanarayan, Mini Das, K Thyagarajan and B P Pal, Optics Communications, 193 (2001) 181-185.
  8. A study on the performance of l band edfas under different pumping configurations, Jagneet Kaur and K Thyagarajan, Optics Communications, 194 (2001) 131-136.
  9. Wavelength division multiplexing isolation filter using concatenated chirped long period gratings, Mini Das and K. Thyagarajan, Optics Communications, 197 (2001) 67-71.
  10. Conception, realization and characterization of a very high negative chromatic dispersion fiber, J L Auguste, J M Blondy, J Maury, J Marcou, B Dussardier, G Monnom, R Jindal, K Thyagarajan and B P Pal, Optical Fiber Technology, 8 (2002) 89-105
  11. A simple and direct method to estimate long period grating parameters, K Thyagarajan, M Das and M N Satyanarayan, Optics Communications, 218 (2003) 67-72.
  12. Novel fiber design for broadband long period gratings, Charu Kakkar and K Thyagarajan, Optics Communications, 220 (2003) 309-314.
  13. Intrinsically gain-flattened staircase profile erbium doped fiber amplifier, K Thyagarajan and Jagneet Kaur Anand, Optics Communications, 222 (2003) 227-233.
  14. Fiber design for broadband, gain flattened raman fiber amplifier, K Thyagarajan and Charu Kakkar, IEEE Photonics Technology Letters, 15 (2003) 1701-1703.
  15. Edfa gain-flattening using side-polished fiber half-coupler with an overlay waveguide, R.K. Varshney, V. Singh, K. Pande, M.R. Shenoy, B.P. Pal, and K. Thyagarajan, , Acta Optica Sinica, vol. 23 (Suppl. 243), (2003), 243-244.
  16. Zero-loss broadband dispersion compensating scheme for g.652 fibers, K. Pande, M.R. Shenoy, B.P. Pal, and K. Thyagarajan, Acta Optica Sinica, vol. 23 (Suppl. 243), (2003), 92-93.
  17. Non-linear pulse propagation in dispersion decreasing fibers, Deepak Gupta, Gautam Kumar & K. Thyagarajan, Optics Communications,237 (2004) 309-317.
  18. Novel fiber design for flat gain raman amplification using single pump and dispersion compensation in s-band, K Thyagarajan and Charu Kakkar, J. Lightwave Technology, vol. 22 (2004) pp. 2279-2286
  19. S-band single stage edfa with 25 db gain using distributed ase suppression, K Thyagarajan and Charu Kakkar, IEEE Photonics Tech. Letts., 16 (2004) pp 2448 - 2450.
  20. Broadband, lossless dcf utilizing flat-gain raman amplification in asymmetrical twin-core fiber, Charu Kakkar and K Thyagarajan, Applied Optics 44 (2005) pp. 2396-2401.
  21. High gain raman amplifier with inherent gain flattening and dispersion compensation, Charu Kakkar and K. Thyagarajan, Optics Communications, 250 (2005) pp. 77-83.
  22. Segmented-clad fiber design for inherently gain flattened L+ band tdfa, Charu Kakkar, Gerard Monnom, K. Thyagarajan and Bernard Dussardier, IEEE Photonics Technology Letters, 17 (2005), pp. 1833-1835.
  23. Segmented-clad fiber design for tunable leakage loss, Charu Kakkar and K. Thyagarajan, J. Lightwave Technology-Special issue on Optical Fiber Design, 23, pp. 3444-3453 (2005)
  24. Inherently gain flattened L+ band tdfa based on W-fiber design, Charu Kakkar, Gérard Monnom, K. Thyagarajan, and Bernard Dussardier Optics Communications, Volume 262, pp.193-199 (2006).
  25. Polarization mode dispersion in single mode optical fibers due to core-ellipticity, Deepak Gupta, Arun Kumar and K Thyagarajan, Optics Communications, 263, pp. 36-41 (2006).
  26. Design optimisation for obtaining flat, high power supercontinuum source over C + L band, Charu Kakkar and K Thyagarajan, Optics Express, 14, pp. 10292-10297, (2006).
  27. Graphical representation of the supermode theory of a waveguide directional coupler, Naveen Kumar, M R Shenoy, K Thyagarajan and B P Pal, Fiber and Integrated Optics, In Press (2007)
  28. SHG in bragg reflection waveguides for enhanced bandwidth applications, Ritwick Das and K. Thyagarajan, Optics Communications, Volume 270, Issue 1, 1 February 2007, Pages 79-84
  29. Anomalous behaviour in a bragg reflection waveguide, Ritwick Das and K. Thyagarajan Optics Communications, Volume 273, 1 May 2007, Pages 84-88.
  30. Broadband parametric amplification in bragg reflection waveguide, Ritwick Das and K Thyagarajan, J. Modern Optics, 55 (2008) pp. 273-279
  31. Effect of second-order polarization mode dispersion on the performance of pmd emulators, Deepak Gupta, Arun Kumar and K. Thyagarajan, Optical Engineering, 46 (2007) 085006
  32. All-in-one measurement setup for fast and accurate linear characterization of guided-wave optical devices, DavideCastaldini, Paolo Bassi, Sorin Tascu, Gregory Sauder , Pierre Aschieri, Marc De Micheli, Pascal Baldi, Krishna Thyagarajan, Mangalpady R. Shenoy, Optical Engineering 46(12), 1 December 2007, 124601.
  33. A high efficiency scheme for phase matched shg in gan based bragg reflector waveguide, Ritwick Das and K Thyagarajan, IEEE Photonics Technology Letters, 17 (2007) 1526-1528.
  34. Mechanisms of generation of multi-peak and mode locked resembling pulses in q-switched yb-doped fiber lasers, B N Upadyaya, Usha Chakravarty, A Kuruvilla, S M Oak, K Thyagarajan and M R Shenoy, Optics Express, Vol. 15 Issue 18, pp.11576-11588 (2007)
  35. Effect of steady-state conditions on self-pulsing characteristics of Yb-doped cw fiber lasers, B.N. Upadhyaya, Usha Chakravarty, A. Kuruvilla and A.K. Nath, M.R. Shenoy and K. Thyagarajan, Optics Communications, Volume 281, Issue 1, 1 January 2008, Pages 146-153
  36. Broadening of the phase-matching bandwidth in quasi-phase matched second harmonic generation using gan based bragg reflection waveguide, Ritwick Das and K Thyagarajan, Optics Letters 32 (2007) pp. 3128-3130.
  37. Multichannel gain and noise figure evaluation of raman/edfa hybrid amplifiers, Umesh K Tiwari, K. Thyagarajan, Krishnan Rajan, Optics Communications Volume 281, Issue 6, 15 March 2008, Pages 1593-1597.
  38. Increased pump acceptance bandwidth in spontaneous parametric down conversion process using bragg reflection waveguides Krishna Thyagarajan, Ritwick Das, Olivier Alibart, Marc de Micheli, Daniel B. Ostrowsky, and Sébastien Tanzilli, , Optics Express Vol. 16 Issue 6, pp.3577-3582 (2008).
  39. Multi-channel gain and noise figure evaluation of Raman/EDFA hybrid amplifiers, Umesh Tiwari, Krishnan Rajan, K. Thyagarajan, Optics Communications, Volume 281, Issue 6, 15 March 2008, Pages 1593-1597
  40. Strong dispersive features of dual Bragg cladding waveguides using higher-order mode-coupling mechanism, Ritwick Das and K Thyagarajan, J. Opt. A: Pure Appl. Opt. 11 (2009) p. 105410
  41. Ultra-broadband mid-infrared generation by using group-velocity-dispersion tailoring in a Bragg reflection waveguide for difference-frequency-generation process, Ritwick Das and K Thyagarajan, APPLIED OPTICS , 48 (2009), p. 5678
  42. Broadband mid-infrared generation by difference-frequency-generation in strongly dispersive Bragg reflection waveguides, Ritwick Das and K Thyagarajan, JOURNAL OF APPLIED PHYSICS 106 (2009) 093101
  43. Simulation and experimental characterization of Raman/EDFA hybrid amplifier with enhanced performance, Umesh Tiwari, K. Thyagarajan, M.R. Shenoy, Optics Communications 282 (2009) 1563–1566
  44. Up-conversion detectors at 1550 nm for quantum communication: Review and recent advances, M. Tournier, O. Alibart, F. Doutre1, S. Tascu, M. P. De Micheli, D. B. Ostrowsky, K. Thyagarajan, S. Tanzilli, EAS Publications Series, Vol.37 (2009) pp.311-339
  45. Generation of polarization-entangled photons using type-II doubly periodically poled lithium niobate waveguides, K. Thyagarajan, J. Lugani, S. Ghosh, K.Sinha, A.Martin, O. Alibart, D.B. Ostrowsky, S. Tanzilli, Phys. Rev. A, Vol 80, 052321 (2009)
  46. Self-pulsing characteristics of a high-power single transverse mode Yb-dopedCW fiber laser, B.N. Upadhyaya a,*, Usha Chakravarty a, A. Kuruvilla a, S.M. Oak a, M.R. Shenoy b, K. Thyagarajan, Optics Communications 283 (2010) 2206–2213
  47. Non-diffracting Airy beams in planar optical waveguides: a convenient method for visualization, Vasudevan Lakshminarayanana* and Krishna Thyagarajan, J. Modern Optics, 2010, 1–4, iFirst
  48. Analysis of buried parabolic index segmented channel waveguides with z-dependent profile, Ruchi Garg, M.R. Shenoy, K. Thyagarajan, Optics Communications 284 (2011) 1202–1207
  49. Analysis of Output Pulse Characteristics in Q-switched Yb-doped Fiber Laser, B. N. Upadhyaya*, Arun Kumar, Usha Chakravarty and S. M. Oak, M. R. Shenoy and K. Thyagarajan, IEEE Journal of Quantum Electronics, 47 (2011)786-794
  50. Generation of modal and path entangled photons using domain engineered integrated optical waveguide device, Jasleen Lugani, Sankalpa Ghosh, and K. Thyagarajan, Phys. Rev. A 83 (2011) 062333
  51. Polarization-independent wavelength filter based on dual asymmetric long-period gratings in channel waveguides, Ruchi Garg and K. Thyagarajan, Journal of Modern Optics Vol. 58, No. 18, 20 October 2011, 1633–1637
  52. Tunable WDM channel isolation filter based on dual chirped long period fiber gratings, UmeshTiwari, Saurabh Mani Tripathi, Krishna Thyagarajan, Mangalpady Raj Shenoy, Vandana Mishra, Subhash Chander Jain, Nahar Singh and Pawan Kapur, Optics Letters, 36 (2011) 3747
  53. Multiple-Wavelength Quasi-Phase-Matching for Efficient Idler Generation in MgO:LiNbO3 based Nanosecond OPO, Om Prakash Naraniya, M. R. Shenoy, K. Thyagarajan, Applied Optics, 51 (2012) 1312
  54. Electro-optically switchable spatial-mode entangled photon pairs using a modified Mach–Zehnder interferometer, Jasleen Lugani, Sankalpa Ghosh, and Krishna Thyagarajan, Optics Letts., Vol. 37, (2012) 3729
  55. Fock-space exploration by angle-resolved transmission through a quantum diffraction grating of cold atoms in an optical lattice, Adhip Agarwala, Madhurima Nath, Jasleen Lugani, K. Thyagarajan, and Sankalpa Ghosh, PHYSICAL REVIEW A 85, 063606 (2012).
  56. Superimposed long period fiber grating based refractive index sensor, Ruchi Garg and K Thyagarajan, Journal of Modern Optics Vol. 59, 1856–1862 (2012)
  57. Long Period Fiber Grating based Temperature Insensitive High Performance Biosensor, Ruchi Garg, Saurabh Mani Tripathi, Krishna Thyagarajan, and Wojtek J. Bock, Sensors and Actuators B 176, 1121– 1127 (2013).
  58. EDF-Based Edge-Filter Interrogation Scheme for FBG Sensors, Umesh Tiwari, Krishna Thyagarajan, Mangalpady R. Shenoy, and Subhash C. Jain, IEEE SENSORS JOURNAL, VOL. 13 , 1315 (2013)
  59. Switchable hyperentangled photon pairs from an integrated optic waveguide device, Jasleen Lugani, Sankalpa Ghosh and K Thyagarajan, J. Opt. Soc. Am. B Vol. 30, 795 (2013)
  60. Cascaded coupling: realization and application to spectral maneuvering, Ruchi Garg and K Thyagarajan, Optical Fiber Technology 19 (2013) 148–153
  61. Polarization based refractive index sensor using dual asymmetric long-period gratings in ridge waveguides, Ruchi Garg and K Thyagarajan, Applied Optics, 52, pp. 2086-2092 (2013). Also selected for publication in Virtual Journal of Biomedical Optics, 8, Iss. 5- Jun. 6, 2013.
  62. Efficiency Improvement in MgO:PPLN Based Optical Parametric Generation Using Soft-Edge Top-Hat Transverse Intensity Profile for the Pump Beam, Om Prakash Naraniya, M. R Shenoy, K. Thyagarajan, Optics Communications, 316 (2013) pp. 74-79
  63. Strain and temperature discrimination technique by use of A FBG written in erbium doped fiber, Umesh Tiwari, Krishna Thyagarajan, Mangalpady R. Shenoy, Optik 125 (2014) 235– 237.
  64. Generation of N-partite single and two photon W states with enhanced tolerance using waveguide arrays, Surajit Paul and K Thyagarajan, J. Opt. 16 (2014) 105503
  65. Long Period Fiber Grating Based Novel Optical Fiber Devices, K Thyagarajan and Ruchi Gupta, J. Indian Institute of Science, VOL 94:3 Jul.Sep. 2014, 311
  66. Identifying insulating states of ultra cold atoms with cavity transmission spectrum, Jasleen Lugani, K Thyagarajan and Sankalpa Ghosh, J. Phys. B: At. Mol. Opt. Phys. 47 (2014) 045301
  67. Generation of Higher Dimensional Modal Entanglement Using a Three Waveguide Directional Coupler, Divya Bharadwaj, K Thyagarajan, Michal Karpinski and Konrad Banaszek, Physical Review A, 91, 033824 (2015)
  68. Mimicking photon propagation through 2-D waveguide array by a 1-D waveguide array, Surajit Paul and K Thyagarajan, J. Optical Society of America A, J Opt Soc. Am. A 32, 1032-1039 (2015)
  69. Numerical study of high-energy optical parametric oscillator with top-hat pump intensity profile and quasi phase matched crystal with wedge shaped domain, O P Naraniya, M R Shenoy and K Thyagarajan, J. Nonlinear and optical Physics and Materials, 24, 1550035 (2015)
  70. Efficient scheme for mid-infrared generation using simultaneous optical parametric oscillations and DFG processes in a double-pass configuration, O P Naraniya, M R Shenoy and K Thyagarajan, Applied Optics, 54, 7234-7239 (2015)
  71. Coherent tunneling adiabatic passage in optical fibers using superimposed long period fiber gratings, K Thyagarajan and Ruchi Gupta, J Modern Optics, 1-9 (2016)
  72. Scheme for on chip verification of transverse mode entanglement using the electro-optic effect, D Bharadwaj, K Thyagarajan, M Jachura, M Karpinski and K Banaszek, Optics Express, 23, 33087-33098 (2016)
  73. Coherent tunnelling adiabatic passage in optical fibres using superimposed long-period fiber gratings, K Thyagarajan and Ruchi Gupta, Journal of Modern optics, Vol. 63, no. 14, 13311339 (2016)
  74. Highly efficient broadband waveguide adiabatic polarization converter with apodization, Pragati Aashna and K Thyagarajan, IEEE Photonics Technology Letters, (In Press) 2016
  75. Generation of polarization entangled photon pairs in a planar waveguide, Divya Bharadwaj and K. Thyagarajan, Physical Review A (In Press) 2016
  76. Generation and characterization of discrete spatial entanglement in multimode nonlinear waveguides, Michal Jachura, Michal Karpinski, Konrad Banaszek, Divya Bharadwaj, Jasleen Lugani, and K. Thyagarajan, Physical Review A (In Press) 2017

Indian Institute of Technology Delhi