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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

Complete list of research publications

  1. Perturbation theory for studying the effect of the term in lens like media, K Thyagarajan and A K Ghatak, Optics Communications 11, 417‑421 (1974).
  2. Modes in inhomogeneous slab waveguides, Arun Kumar, K Thyagarajan and A K Ghatak, IEEE J of Quantum Electronics, QE‑10, 902‑904 (1974).
  3. Ray and energy propagation in graded index media, A K Ghatak and K Thyagarajan, J. of Optical Society of America, 65, 169‑173 (1975).
  4. Hamiltonian theory of third order aberrations of inhomogeneous lenses, K Thyagarajan and A K Ghatak, Optik, 44, 329‑342 (1976).
  5. Theory of fifth order aberrations of graded index media, Anjana Gupta, K Thyagarajan, I C Goyal and A K Ghatak, J. of Optical Society of America, 66, 1320‑1326 (1976)
  6. Ray tracing in uniaxial and biaxial media, Enakshi Khular, K Thyagarajan and A K Ghatak, Optik, 46, 297‑307 (1976)
  7. Third order aberrations of conical selfoc fibers, K Thyagarajan, Aruna Rohra and A K Ghatak J Optics, 5,27‑31 (1976)
  8. A note on mirage formation, Enakshi Khular, K Thyagarajan and A K Ghatak, American Journal of Physics, 45, 90‑92 (1977)
  9. Pulse broadening in optical fibers, K Thyagarajan and A K Ghatak, Applied Optics, 16, 2583‑2585 (1977).
  10. Modes in optical waveguides formed by silver sodium ion exchange, A K Ghatak, Enakshi Khular and K Thyagarajan, IEEE J Quantum Electronics, QE‑14, 389-391 (1978)
  11. Efficient coupling of incoherent light into optical fibers and bundles, K Thyagarajan, Anurag Sharma and A K Ghatak, Applied Optics, 17, 2416‑2419 (1978): Errata APPLIED OPTICS 18, 607 (1979)
  12. Mode excitation by tilted and offset gaussian beams in W- type fibers, Ram Chandra, K Thyagarajan and A K Ghatak, Applied Optics, 17, 2842‑2847 (1978)
  13. Aberrations in curved graded index fibers, Aruna Rohra, K Thyagarajan and A K Ghatak, J Optical Society of America, 69, 300‑310 (1979)
  14. Coupling of two parallel multimode parabolic index waveguides‑an exact analysis in the weakly guiding approximation, Anurag Sharma, Enakshi Khular, K Thyagarajan and A K Ghatak, Optics Communications, 30, 166‑169 (1979)
  15. Aberrations in conically graded index media, K Thyagarajan, Aruna Rohra and A K Ghatak, Optica Acta, 26, 863‑871 (1979)
  16. Aberration losses of the microoptic directional coupler , K Thyagarajan, Aruna Rohra and A K Ghatak, Applied Optics, 19, 266‑269 (1980); Reprinted in Applied Optics (USA) 19, 1061‑1064 (1980)
  17. Exact analysis of the evanescent coupling between two indiffused optical waveguides, K Thyagarajan, Arun Kumar and I C Goyal, Applied Optics, 20, 1821‑1824 (1981)
  18. Perturbation analysis of the coupling between two cylindrical parabolic index waveguides, K Thyagarajan, Arun Kumar and A K Ghatak, Optics Communications, 39, 26‑30 (1981)
  19. Scattered light measurement of the circular birefringence in a twisted single mode fiber, P Graindorge, K Thyagarajan, H Arditty and M Papuchon, Optics Communications, 41, 164‑168 (1982)
  20. An analytical model for studying two mode fibers: splice loss predictions, K Thyagarajan, A Gupta, B P Pal and A K Ghatak, Optics Communications, 42, 92‑96 (1982)
  21. Coupling characteristics of diffused channel waveguide directional coupler, Uma Jain, Anurag Sharma, K Thyagarajan and A K Ghatak, J. Optical Society of America, 72, 1545‑1549 (1982)
  22. Estimation of the modal field profile of single mode graded index fibers from the far field pattern, Ramanand Tewari, K Thyagarajan, B P Pal and A K Ghatak, Optics Communications, 44, 94‑99 (1982)
  23. Analysis of rectangular core dielectric waveguides: an accurate perturbation approach, Arun Kumar, K Thyagarajan and A K Ghatak, Optics Letters, 8, 63‑65 (1983)
  24. Accurate method for characterizing single mode fibers: theory and experiment, A K Ghatak, R Srivastava, I F Faria, K Thyagarajan and R Tiwari, Electronics Letters, 19, 97‑99 (1983)
  25. Scalar variational analysis of single mode fibers with gaussian and smoothed out profiles, Ramanand Tewari, S I Hosain and K Thyagarajan, Optics Communications, 48, 176‑180 (1983)
  26. Inverse wkb method for refractive index profile estimation of monomode graded index planar optical waveguides, A N Kaul and K Thyagarajan, Optics Communications, 48, 313‑318 (1984)
  27. Birefringence calculations in elliptical core optical fibers, Arun Kumar, R K Varshney and K Thyagarajan, Electronics Letters, 20, 112‑113 (1984)
  28. Gaussian approximation of the fundamental mode in single mode elliptic core fibers, Somenath Sarkar, K Thyagarajan and Arun Kumar, Optics Communications, 49, 178‑183 (1984)
  29. Novel refractometer using a tapered optical fiber, Arun Kumar, T V B Subrahmaniam, A D Sharma, K Thyagarajan, B P Pal and I C Goyal, Electronics Letters, 20, 534‑ 535 (1984)
  30. Modes in anisotropic rectangular waveguides: an accurate and simple perturbation approach, Arun Kumar, M R Shenoy and K Thyagarajan, IEEE Transactions on Microwave Theory and Techniques, MTT‑32, 1415‑1418 (1984).
  31. Accurate analysis of single mode graded index fiber directional couplers, K Thyagarajan and Ramanand Tiwari, IEEE Journal of Lightwave Technology, LT‑3, 59‑63 (1985)
  32. Experimental demonstration of tm mode attenuation resonance in planar metal clad optical waveguides, K Thyagarajan, Y Bourbin, A Enard, S Vatoux and M Papuchon, Optics Letters, 10, 288‑290 (1985)
  33. Energy levels of a finite step three-dimensional potential box: a perturbation approach, A K Ghatak, Arun Kumar and K Thyagarajan, American Journal of Physics, 53, 567 (1985)
  34. Coupling characteristics of a three channel waveguide directional coupler, A Kaul, K Thyagarajan and Arun Kumar, Optics Communications, 56, 95 (1985)
  35. Measurement of guided mode cutoff wavelengths in Ti: LiNbO3 channel waveguides, K Thyagarajan, A Enard, P Kayoun, D Papillon and M Papuchon, Integrated Optics (Eds. H P Nolting and R Ulrich) Vol.48, Springer series in Optical Sciences, 4, 236 (1985)
  36. A simple numerical method for studying the propagation characteristics of single mode graded index planar optical waveguides, A N Kaul, S I Hosain and K Thyagarajan, IEEE Transactions on Microwave Theory and Techniques, MTT‑34, 288 (1986)
  37. Analysis of tunable single mode fiber directional couplers using simple and accurate relations, Ramanand Tewari and K Thyagarajan, IEEE Journal of Lightwave Technology, LT‑4, 386 (1986)
  38. Beam propagation under frustrated total reflection, A K Ghatak, M R Shenoy, I C Goyal and K Thyagarajan, Optics Communications, 56, 313 (1986)
  39. An accurate analysis of directional couplers typical of electron beam writing techniques, Ramanand Tewari, Arun Kumar and K Thyagarajan, Optics Communications, 58, 95 (1986)
  40. calculation of relative single polarization bandwidth in side pit fibers, A N Kaul, Arun Kumar and K Thyagarajan, Electronics Letters, 22, 786 (1986)
  41. A novel method for characterization of single mode fibers and prediction of cross over wavelength and bandpass in non identical fiber directional couplers, Ramanand Tewari, K Thyagarajan and A K Ghatak, Electronics Letters, 22, 792 (1986)
  42. Prism coupling technique: a method for measurement of propagation constant and beat length in single mode fibers, K Thyagarajan, M R Shenoy and M R Ramadas, Electronics Letters, 22, 832‑833 (1986)
  43. Attenuation characteristics of single mode metal clad graded index waveguides with a dielectric buffer: a simple and accurate method, K Thyagarajan, A N Kaul and S I Hosain, Optics Letters, 11, 479‑481 (1986)
  44. Lens coupling of laser diodes to monomode elliptic core fibers, S N Sarkar, B P Pal and K Thyagarajan Journal of Optical Communications, 7, 92‑96 (1986)
  45. Polarization characteristics of elliptic core fibers with stress induced anisotropy, Arun Kumar, M R Shenoy and K Thyagarajan IEEE Journal of Lightwave Technology, LT‑5, 193‑198 (1987)
  46. Numerical analysis of planar optical waveguides using matrix approach, A K Ghatak, K Thyagarajan and M R Shenoy, IEEE Journal of Lightwave Technology, LT‑5, 660‑667 (1987)
  47. The local absorption technique: a straightforward characterization method for many optical devices, Y Bourbin, A Enard, M Papuchon and K Thyagarajan, IEEE Journal of Lightwave Technology, LT‑5, 684‑688 (1987)
  48. Geometrical birefringence of polished and d shape fibers, Arun Kumar, Vineeta Gupta and K Thyagarajan, Optics Communications, 61, 195 (1987)
  49. An accurate method for the calculation of bending loss in optical waveguides using matrix approach, K Thyagarajan, M R Shenoy and A K Ghatak, Optics Letters, 12, 296‑298 (1987); ERRATUM, Optics Letters, April 1989.
  50. Equivalent step index (esi) model for elliptic core fibers, K Thyagarajan, S N Sarkar and B P Pal, IEEE Journal of Lightwave Technology, LT‑5, 1041‑1044 (1987)
  51. Analytical investigations of leaky and absorbing planar structures, K Thyagarajan, Supriya Diggavi and A K Ghatak, Optical and Quantum Electronics, 19, 131‑137 (1987)
  52. Polarization characteristics of side pit and side tunnel fibers using the effective index method, A N Kaul, Arun Kumar and K Thyagarajan, IEEE Journal of Lightwave Technology, LT‑5, 1610‑1612 (1987)
  53. Estimation of spot sizes from the far field measurement of a single mode fiber, B P Pal, Vishnu Priye, R N Tewari and K Thyagarajan Journal of Optical Communications, 8, 70‑73 (1987)
  54. Beat length measurement of birefringent optical fibers, K Thyagarajan, M R Ramadas and M R Shenoy, Optics Letters, 12, 935‑937 (1987)
  55. Numerical analysis of optical fibers using matrix approach, M R Shenoy, K Thyagarajan and A K Ghatak, IEEE Journal of Lightwave Technology, LT‑6, 1285‑1291 (1988)
  56. Design and analysis of a novel polarization splitting directional coupler, K Thyagarajan, Supriya Diggavi and A K Ghatak, Electronics Letters, 24, 869‑870 (1988)
  57. A novel matrix approach for solving multiple quantum well problem, A K Ghatak, K Thyagarajan and M R Shenoy, Thin Solid Films, 163, 461‑465 (1988).
  58. A novel numerical technique for solving the one dimensional schroedinger equation using matrix approach ‑ application to quantum well structures, A K Ghatak, K Thyagarajan and M R Shenoy, IEEE Journal of Quantum Electronics, QE‑24, 1524‑1531 (1988).
  59. Vector modes of an optical fiber in the weakly guiding approximation, K Thyagarajan, A K Ghatak and Anurag Sharma, IEEE Journal of Lightwave Technology, LT‑7, 51‑54 (1989).
  60. Analysis of leaky and absorbing planar waveguides, a novel method, M R Ramadas, E Garmire, A K Ghatak, K Thyagarajan and M R Shenoy, Optics Letters, 14 (1989) 376.
  61. Measurements on variation of birefringence with depth of polishing in elliptic core fibers, Arun Kumar, Saeed Pilevar and K Thyagarajan, Optics Communications, 72 (1989) 187‑189.
  62. A matrix approach to study the propagation characteristics of a general nonlinear planar waveguide, M R Ramadas, R K Varshney, K Thyagarajan and A K Ghatak, IEEE J. Lightwave Technology, LT‑7 (1989) 1901.
  63. Perturbation analysis of polarization splitting directional couplers, Supriya Diggavi, K. Thyagarajan and A.K. Ghatak, Applied Optics, 28 (1989) 3450.
  64. Integrated optic polarization splitting direction coupler, K. Thyagarajan, Supriya Diggavi and A.K. Ghatak, Optics Letters, 14 (1989) 1333.
  65. Simple prism coupling technique to measure the refractive index of a liquid and its variation with temperature, M.R. Shenoy, Sukhdev Roy and K. Thyagarajan, Reviews of Scientific Instruments, 61 (1990) 1010‑1013.
  66. Thin metal clad waveguide polarizers: analysis and comparison with experiment, K. Thyagarajan, Supriya Diggavi, A.K. Ghatak, W. Johnstone, G. Stewart and B. Culshaw, Optics Letters, 15 (1990) 1041‑1043.
  67. Analysis of dual metal coated in line fiber optic polarizer, S. Pilevar, K. Thyagarajan and Arun Kumar, Journal of Optical Communications, 12 (1991) 22‑25.
  68. Accurate empirical relations for characterizing a single mode matched clad fiber from its far field pattern, Sukhdev Roy, Ramanand Tewari and K. Thyagarajan, Journal of Optical Communications, 12 (1991) 26‑28.
  69. Waveguide polarizer based on resonant tunnelling, K. Thyagarajan, Supriya Diggavi and A.K. Ghatak, IEEE J. Lightwave Technology, 9 (1991) 315‑317.
  70. Polarization characteristics of a metal clad elliptic core fiber polarizer, Saeed Pilevar, Arun Kumar and K. Thyagarajan, Optics Communication, 83 (1991) 31.
  71. A simple numerical technique for the analysis of cylindrically symmetric refractive index profile optical fibers, K. Thyagarajan, Supriya Diggavi, Anju Taneja and A.K. Ghatak, Applied Optics, 30 (1991) 3877.
  72. Analysis of metal clad uniaxial waveguides, J. Singh and K. Thyagarajan, Optics Communications, 85, (1991) 397‑402.
  73. Band stop filter characteristics of non identical waveguide directional couplers: a comparison of three methods, S. Pilevar, Arun Kumar and K. Thyagarajan, Optics Communications, 84, (1991) 144‑148.
  74. Design considerations of a dual mode/single mode waveguide modal filter, Saeed Ghadirli, Arun Kumar, and K. Thyagarajan, International J. Optoelectronics, 7 (1992) 409-415.
  75. Performance of a dual mode/single mode waveguide coupler as a modal filter, Arun Kumar, Saeed Ghadirli & K. Thyagarajan, Applied Optics, 31 (1992) pp.5092-5095.
  76. Resonant tunnelling three waveguide polarization splitter , K. Thyagarajan & Saeed Pilevar, IEEE J. Lightwave Technology 10 (1992) pp 1334-1337.
  77. Waveguide length dependence of cerenkov shg in LiNbO3 waveguides having finite loss, M.R. Shenoy, V. Mahalakshmi and K. Thyagarajan, J. Modern Optics, 40 (1993) pp 281-288.
  78. Performance comparison of different configurations for shg in planar waveguides, K. Thyagarajan, V. Mahalakshmi and M.R. Shenoy, Int. J. Optoelectronics, 8 (1993) pp. 319-332.
  79. Proton exchanged periodically segmented waveguides in LiNbO3, K. Thyagarajan, R.V. Ramaswamy, H.S. Kim C. W. Chien and H.C. Cheng, Optics Letts., 19 (1994) pp 880-882.
  80. Propagation characteristics of planar segmented waveguides with parabolic index segments, K. Thyagarajan, V. Mahalakshmi & M.R. Shenoy, Optics Letts., 19 (1994) pp 2113-2215.
  81. Equivalent waveguide model for parabolic index planar segmented waveguides, K. Thyagarajan, V. Mahalakshmi and M. R. Shenoy, Optics Comm. 121 (1995) 27.
  82. Propagation characteristics of novel gain guided segmented planar waveguides, K. Thyagarajan, Vipul Rastogi, V. Mahalakshmi and M. R. Shenoy, Optics Comm. 121 (1995) 19.
  83. Role of bend on the optimization of 980 nm pumped erbium doped fiber amplifiers, P. Palai, K. Thyagarajan, Anil K Roy and B. P. Pal, Optical Fiber Technology, 1 (1995) 341.
  84. Modelling of parametric amplification in the cerenkov-idler configuration in planar waveguides, K. Thyagarajan, Vipul Rastogi, M R Shenoy, D. B. Ostrowsky, M De Micheli and P.Baldi, Optics Letters, 21 (1996) 1631.
  85. A novel design of a dispersion compensating fiber, K. Thyagarajan. ,R. K. Varshney, P. Palai, A. K. Ghatak and I. C. Goyal, Photonics Technology Letters, 8 (1996)1510.
  86. Evolution of the intensity profile of cerenkov second harmonic radiation with propagation distance in planar waveguides, V. Mahalakshmi, M. R. Shenoy and K. Thyagarajan, IEEE J. Quantum Electron. 32 (1996) 137.
  87. Recent advances in fiber optics, A. Ghatak and K. Thyagarajan, IETE Technical review, 14 (1997) 21-31.
  88. Modelling of large bandwidth parametric amplification in the cerenkov idler configuration in planar waveguides, Vipul Rastogi, K. Thyagarajan, M R Shenoy, P.Baldi, , M De Micheli and D. B. Ostrowsky, J. Optical Society of America 14(1997)3191-3196.
  89. Coupled mode analysis to study cascading in the qpm cerenkov regime in waveguides, K. Thyagarajan, Minu Vaya and Arun Kumar, Optics Communications 140(1997)316-322.
  90. Effect of self-phase modulation on a dispersion compensated link employing dispersion compensating fiber, P. Palai and K. Thyagarajan, Optics Communications 143(1997)203-208
  91. Erbium doped dispersion compensating fiber for simultaneous compensation of loss and dispersion, P. Palai, K. Thyagarajan and B. P. Pal, Optical Fiber Technology, 3(1997)149-153.
  92. Analysis and design of a novel leaky yig film guided wave optical isolator, Vishnu Priye, B. P. Pal and K. Thyagarajan, J. Lightwave Tech., 16 (1998) pp. 246-250.
  93. Leaky waveguide configuration for quasi phase matdched second harmonic generation, Minu Vaya, K. Thyagarajan and Arun Kumar, J. Optical Society of America, 15 (1998) pp. 1322-1328.
  94. Propagation characteristics of a novel complementary structure planar segmented waveguide, Vipul Rastogi, M. R. Shenoy and K. Thyagarajan, Optics Communications 148 (1998) pp. 230-235.
  95. Ray analysis of parabolic index segmented planar waveguides, Vipul Rastogi, A. K. Ghatak, D.B. Ostrowsky, K. Thyagarajan and M. R. Shenoy, Applied Optics, 37 (1998) pp. 4851-4856.
  96. Polarizer based on a PbSe-clad optical waveguide in the infrared: role of a buffer layer, G. R.Chakravarty, Vishnu Priye, B.P.Pal and K. Thyagarajan, IEE Proc.-Optoelectronics, 145 (1998) pp. 223-226.
  97. Spectral measurements of the film substrate index difference in proton exchanged linbo3 waveguides, K. El Hadi, Vipul Rastogi, M. R. Shenoy, K. Thyagarajan, M. De Micheli and D. B. Ostrowsky, Applied Optics, 37 (1998) pp. 6463-6467.
  98. Experimental observation of longitudinal modulation of mode fields in periodically segmented waveguides, Pierre Aschieri, Vipul Rastogi, Loic Chanvilliard, Pascal Baldi, Marc P.De Micheli, D. B. Ostrowsky, B. Bellanca, Paolo Bassi, K. Thyagarajan and M. R. Shenoy, Applied Optics, 38(27) (1999), 5734-5737.
  99. Estimation of cut off wavelength of rare earth doped single mode fibers, Jagneet Kaur, K. Thyagarajan and B. P. Pal, Optics Communications, 170 (1999), 355-359.
  100. Role of an optical isolator in optimization of forward conversion efficiency in an er doped sfs source at 1.55 mm, Jagneet Kaur, Suparna Sinha Roy, K. Thyagarajan and B.P.Pal, Optical Fiber Technology, 5(1999), 390-402.
  101. A novel design of an intrinsically gain flattened erbium doped fiber, K. Thyagarajan and Jagneet Kaur, Optics Communications, 183 (2000) 407-413.
  102. -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.
  103. Dispersion compensation in transmission using uniform long period fiber gratings, Mini Das and K. Thyagarajan, Optics Communications, 190 (2001) 159-163.
  104. 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.
  105. Parametric amplification studies in 4-layered qpm leaky waveguides, Minu Vaya, K. Thyagarajan and Arun Kumar, Fiber and Integrated Optics, 20 (2001) 367-376.
  106. 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.
  107. 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.
  108. A study on the performance of l band edfas under different pumping configurations, Jagneet Kaur and K Thyagarajan, Optics Communications, 194 (2001) 131-136.
  109. Wavelength division multiplexing isolation filter using concatenated chirped long period gratings, Mini Das and K. Thyagarajan, Optics Communications, 197 (2001) 67-71.
  110. 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
  111. 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.
  112. Novel fiber design for broadband long period gratings, Charu Kakkar and K Thyagarajan, Optics Communications, 220 (2003) 309-314.
  113. Intrinsically gain-flattened staircase profile erbium doped fiber amplifier, K Thyagarajan and Jagneet Kaur Anand, Optics Communications, 222 (2003) 227-233.
  114. Fiber design for broadband, gain flattened raman fiber amplifier, K Thyagarajan and Charu Kakkar, IEEE Photonics Technology Letters, 15 (2003) 1701-1703.
  115. 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.
  116. 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.
  117. Non-linear pulse propagation in dispersion decreasing fibers, Deepak Gupta, Gautam Kumar & K. Thyagarajan, Optics Communications,237 (2004) 309-317.
  118. 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
  119. 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.
  120. 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.
  121. High gain raman amplifier with inherent gain flattening and dispersion compensation, Charu Kakkar and K. Thyagarajan, Optics Communications, 250 (2005) pp. 77-83.
  122. 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.
  123. 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)
  124. 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).
  125. 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).
  126. 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).
  127. 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)
  128. 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
  129. Anomalous behaviour in a bragg reflection waveguide, Ritwick Das and K. Thyagarajan Optics Communications, Volume 273, 1 May 2007, Pages 84-88.
  130. Broadband parametric amplification in bragg reflection waveguide, Ritwick Das and K Thyagarajan, J. Modern Optics, 55 (2008) pp. 273-279
  131. 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
  132. 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.
  133. 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.
  134. 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)
  135. 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
  136. 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.
  137. 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.
  138. 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).
  139. 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
  140. 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
  141. 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
  142. 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
  143. 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
  144. 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
  145. 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)
  146. 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
  147. 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
  148. 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
  149. 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
  150. 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
  151. 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
  152. 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
  153. 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
  154. 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
  155. 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).
  156. 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)
  157. 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)
  158. Cascaded coupling: realization and application to spectral maneuvering, Ruchi Garg and K Thyagarajan, Optical Fiber Technology 19 (2013) 148153
  159. 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.
  160. 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
  161. 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.
  162. 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
  163. 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
  164. 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
  165. 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)
  166. 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)
  167. 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)
  168. 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)
  169. Coherent tunneling adiabatic passage in optical fibers using superimposed long period fiber gratings, K Thyagarajan and Ruchi Gupta, J Modern Optics, 1-9 (2016)
  170. 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)

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