List of Publications/Patents
Book Authored
1.
“Fiber
optic communications: fundamentals and applications”, S. Kumar and M. J. Deen,
John Wiley and Sons, NY, May 2014.
Book Edited:
1. “Impact of nonlinearities on fiber-optic
communication systems,” Ed. S. Kumar, Springer, NY, 2011.
Book Chapters:
1.
“Optical back propagation for compensation of
dispersion and nonlinearity in fiber optic transmission systems,” X. Liang, J. Shao and S. Kumar, in the book “Odyssey of Light in Nonlinear Optical Fibers: Theory and Applications”
edited by K. Porsezian and R. Ganapathy, Springer,
Dec. 2015.
2.
“Analysis
of nonlinear phase noise in single carrier and OFDM systems,” S. Kumar and X.
Zhu, in the book “Impact of nonlinearities on fiber-optic communication
systems”, pp. 293-324, Springer, NY, 2011.
3.
“Model
for optical propagation in randomly coupled birefringent fiber and its
implementation,” D. Chowdhury, M. Mlejnek and S. Kumar, in the book “Optical
Processes in Microparticles and Nanostructures”, World Scientific Publishing,
2010.
4.
“Temporal
filtering techniques using time lenses for fiber-optic transmission systems”,
D. Yang and
5.
“Collision-induced
impairments in dispersion managed fibers” S. Kumar and A.F. Evans, in “Massive
WDM and TDM Soliton Transmission Systems”, Kluwer Publications, Amsterdam, p.
351-363 (2000).
6.
“Quasi-soliton
collisions” S. Kumar and A. Hasegawa, in “New Trends in Optical Soliton
Transmission”, Kluwer Publications,
7.
“Adiabatic
soliton transmission” Y. Kodama, S. Kumar and A. Hasegawa, in “Physics and
Application of Optical Solitons” Kluwer Publications,
Invited Papers/Review Articles:
1. S. Kumar, J. Mauro,
2.
A.
Belahlou, D. Chowdhury, J. Grochocinski,
S. Kumar, J. Mauro, G. Luther, S. Raghavan …. and S. Tsuda, “Fibers for 40 Gb/s optical
transmission systems”, invited paper, IEEE/OSA Journal of Light Wave Technology, Dec.
2002, vol. 20 p. 2290-2305.
Journal
Publications:
3.
M. M. T. Maghrabi, H. Swaminathan, S. Kumar,
M. H. Bakr and S.M. Ali,
“Enhanced performance of artificial neural network based equalization for short haul fiber optic communications,” Sensors, vol. 23, p. 5952, 2023.
4. M. Khajezadeh and S. Kumar, “Soliton trapping and harmonic oscillations in the
presence of a dark soliton in optical fibers,” IEEE Photonics, vol. 15, pp.1-6,
2023.
5. M. Naghsvarianjahromi, S. Kumar and J. M. Deen, ”Natural intelligence as the brain of intelligent systems,” Sensors, vol. 23, p. 2859, 2023.
6. J. Liu, W. Jiang, S. Kumar and M.J. Deen, “Time
controlled SPAD receivers in optical wireless communication systems,” IEEE
Photonics, vol. 15, pp. 1-13, Oct. 2023.
7. M. Naghsvarianjahromi, S. Kumar and J. M. Deen, “Freespace
ground to satellite optical communications using Kramers-Kronig
transceiver in the presence of turbulence,” Sensors, vol. 22, p. 3435, 2022.
8.
M. M. T. Maghrabi, M. H.
Bakr, and S. Kumar, “Adaptive digital back propagation
exploiting adjoint based optimization for fiber optic communications,” Opt.
Exp., vol. 30, pp. 16264-16288, 2022.
9.
M. Naghshvarianjahromi,
S. Kumar and J. M. Deen, "Software-Defined Fiber Optic
Communications for Ultrahigh-Speed Optical Pulse Transmission Systems,"
in IEEE
Journal of Selected Topics in Quantum Electronics, vol. 28, pp.
1-10, 2022.
10.
M. Naghshvarianjahromi,
S. Majumder, S. Kumar, N. Naghshvarianjahromi and M.
J. Deen, "Natural Brain-Inspired Intelligence for Screening in Healthcare
Applications," in IEEE
Access, vol. 9, pp. 67957-67973, 2021.
11. M. M. T. Maghrabi, M.
H. Bakr, and S. Kumar, "Nonlinear Schrödinger
equation-based adjoint sensitivity analysis," The Applied Computational
Electromagnetics Society (ACES) Journal, vol. 35, no. 11, pp. 1342-1343, 2021.
12.
S.
Kumar, “A general relativistic theory of electromagnetic field” Algebras,
Groups and Geometries, vol. 36, pp. 645-667, 2021.
13.
M. Naghsvarianjahromi, S. Kumar and J. M.
Deen, “Natural Brain-Inspired Intelligence for
Non-Gaussian and Nonlinear Environments with Finite Memory,” Applied Sciences,
vol. 10, issue 3, pp. 1150-1177, 2020.
14.
M.T.
Moghrabi, M.H. Bakr and S. Kumar, “FDTD-based adjoint sensitivity analysis of
high frequency nonlinear structures,” IEEE Transactions on Antennas and
Propagation, vol. 68, no. 6, pp. 4727-4737, June 2020.
15.
E. Bidaki and S. Kumar, “A
Raman-pumped dispersion and nonlinearity compensating fiber for fiber optic
communications,” IEEE Photonics journal, vol. 12, issue 1, Feb. 2020.
16.
M. Naghsvarianjahromi, S. Kumar and J. M.
Deen, “Brain-Inspired Intelligence for Real-Time Health Situation Understanding
in Smart e-Health Home Applications,” IEEE access, vol. 7, pp. 180106-180126,
2019.
17.
M. Naghsvarianjahromi, S. Kumar and J. M.
Deen, “Brain-Inspired Cognitive Decision Making for Nonlinear and Non-Gaussian
Environments,” IEEE access, vol. 7, pp. 180910-180922, 2019.
18.
M. Naghsvarianjahromi, S. Kumar and J. M.
Deen, “Brain inspired dynamic system for the quality of service control over
the long-haul nonlinear fiber optic networks,” Sensors, vol. 19, issue 9, pp.
2175-2200, 2019.
19.
M.T. Moghrabi, M.H. Bakr and S.
Kumar, “Adjoint sensitivity analysis approach for the nonlinear Schrodinger
equation,” OSA Opt. Lett., vol. 44, issue 16, pp. 3940-3943, 2019.
20.
S. Rahbarfam and S. Kumar, “Nonlinear phase noise reduction using digital back
propagation and midpoint optical phase conjugation,” OSA Opt. Exp., vol. 27,
issue 6, pp. 8968-8982, 2019.
21.
E. Bidaki and S. Kumar, “A
Raman-pumped dispersion and nonlinearity compensating fiber for fiber optic
communications,” IEEE photonics journal, 2019.
22.
E.
Bidaki and S. Kumar, “Nonlinear Fourier transform
using multistage perturbation technique for fiber optic systems”, J. Opt. Soc.
Am. B, vol. 35, issue 9, pp. 2286-2293, 2018.
23.
M.T.
Moghrabi, S. Kumar and M.H. Bakr, “Dispersion compensation of fiber optic
communication system with direct detection using artificial neural networks
(ANNs),” Opt. Comm., vol. 409, pp. 109-116, 2018.
24.
S.
Kumar, M. Nakazawa, “Discrete solitons in optical fibers with large
pre-dispersion,” Opt. Exp., vol. 25, pp. 19923-19945, Issue 17, 2017.
25.
X.
Liang and S. Kumar, “Optical back propagation for
fiber optic networks with hybrid EDFA Raman amplification,” Opt. Exp., vol. 25, issue 5, pp. 5031-4043, 2017.
26.
X.
Liang and S. Kumar, “Optical back propagation for compensating nonlinear
impairments in fiber optic links with ROADMS,” Opt.
Exp., vol. 24, issue 20, pp. 22682-22692, 2016.
27.
S.
Kumar and S. K. Biswas, “Impact of Kerr nonlinearity and
stimulated Raman scattering on the whispering gallery modes of an optical
microsphere,” J. of Optical Society of Am. B, vol. 33, issue 8, pp. 1677-1687,
2016.
28.
S.
Kumar and J. Shao, “Stochastic interference in a dispersive nonlinear optical
fiber system,” Opt. Exp., Vol. 24, issue 5, pp. 5638-5653, 2016.
29.
J.
Shao and S. Kumar, “Signal processing for fiber optic systems”, Recent patents
on signal processing, vol.
5, pp. 3- 15, April 2016.
30.
S. K. Biswas and S. Kumar, “Impact
of Kerr Nonlinearity on whispering gallery modes of a microsphere,” Opt. Exp., vol. 23, issue 20, pp. 26738-26753, Oct. 2015.
31.
J. Shao and S. Kumar,
“Stochastic interference in a dispersive fiber excited by a partially coherent
source”, Opt. Exp., vol. 23, issue 22, pp.
29163-29173, Nov. 2015.
32. X. Liang and S. Kumar, “Correlated digital back propagation based on perturbation theory,” Opt. Exp., vol. 23, issue 11, pp. 14655-14665, 2015.
33. S. Kumar, J. Shao and X. Liang, “Impulse response of nonlinear Schrodinger equation and its implications for pre-dispersed fiber optic systems,” Opt. Exp., vol. 22, pp. 32282-32292, 2014.
34. X. Liang and S. Kumar, “Multistage perturbation theory for compensating intra-channel impairments in fiber optic systems,” Opt. Exp., vol. 22, pp. 29733-29745, 2014.
35. Z. Li, M.J. Deen,S. Kumar and P. R. Selvaganapathy, “Raman Spectroscopy for In-Line Water Quality Monitoring—Instrumentation and Potential,” Sensors, vol. 14, pp.17275-17303, 2014.
36. X. Liang, S. Kumar, J.
Shao, M. Malekiha and D.V. Plant, “Digital compensation of cross-phase modulation
distortions using perturbation techniques for dispersion-managed fiber-optic
system,” Opt. Exp., Vol. 22, Issue 17, pp. 20634-20645, 2014.
37. X. Liang and S.
Kumar, “Analytical modeling of
cross-phase modulation in dispersion-managed coherent fiber optic systems,” Opt. Exp., Vol. 22, Issue 9, pp.
10579-10592, 2014.
38.
J. Shao, S. Kumar and
X. Liang, “Comparison
of split-step Fourier schemes for simulating fiber optic systems”, IEEE
Photonics Journal, vol. 6, no. 4, p. 7200515, 2014.
39.
S.N. Shahi, S. Kumar and X. Liang, “Analytical modeling of
cross-phase modulation in coherent fiber optic systems,” OSA Opt. Exp, vol. 22,
pp. 1426-1439, 2014.
40.
J. Shao, S. Kumar and X. Liang, “Digital back propagation with
optimal step size for polarization multiplexed transmission,” IEEE Photon.
Tech. Lett., vol. 25, pp. 2325-2330, 2013.
41.
X. Liang, S. Kumar and J. Shao, “Ideal optical backpropagation
of scalar NLSE using dispersion-decreasing fibers for WDM transmission”, OSA
Opt. Exp., vol. 21, pp. 28668-28675, 2013.
42.
S. Kumar and J. Shao, “Optical back propagation with optimal step size for fiber
optic transmission systems, IEEE Photon. Tech. Lett., vol. 25, pp. 523-526,
2013.
43.
S.N. Shahi and S. Kumar, “A multi-core or
multi-fiber WDM system”, Opt. Comm., vol. 294, pp. 289-293, 2013.
44.
M. Malekiha, D.
Yang and S. Kumar, “Comparison of optical back propagation schemes for
fiber-optic communications,” Opt. Fib. Tech., Vol. 19, pp.4-9, 2013.
45.
S. Kumar, S.N. Shahi and D. Yang, “Analytical
modeling of single channel nonlinear fiber optic system based on QPSK,” Opt.
Exp., vol. 27, 277740, 2012.
46.
S.N. Shahi and S. Kumar,
“Reduction of nonlinear impairments in fiber transmission systems using fiber
and or transmitter diversity,” Opt. Comm.,vol. 285, pp.3553-3558, 2012.
47.
J. Shao and S. Kumar, “Optical
backpropagation for fiber optic communications using optical phase conjugation
at the receiver,” Opt.
Lett., vol. 285, pp. 3553-3558, 2012.
48.
S. Kumar and D. Yang, “Optical
backpropagation for fiber-optic communications using highly nonlinear fibers,”
Opt. Lett., vol. 36, pp. 1038-1040, 2011.
49.
Z. Chen and S. Kumar, “A fiber optic
transmission system based on differential polarization shift keying,” Opt.
Comm., vol. 284, pp. 4064-4069, 2011.
50.
D. Yang, S. Kumar and M. Nakazawa,
“Investigation and comparison of digital back propagation schemes for OFDM and
single-carrier fiber-optic transmission systems,” Opti. Fib. Tech., vol. 17,
pp. 84-90, 2011.
51.
S. Kazemlou, S. Hranilovic and S. Kumar, “All optical multi-hop free space
optical communication systems,” IEEE/OSA J. Lightwave Tech., vol.29, pp.
2663-2669, 2011.
52.
X. Zhu, and S. Kumar, "Nonlinear phase
noise in coherent optical OFDM transmission systems," Optics Express, vol.
18, no. 7, pp. 7347-7360, 2010.
53.
C. Sarkis and S. Kumar, “Significant Reach
Enhancement for Dispersion Limited Direct Detection Systems Using Offset
Carrier
and Linear Electrical Equalizers,” vol.
16, Optical Fiber Technlogy, pp. 110-
113, 2010.
54.
D. Yang and S. Kumar, “Analysis of intrachannel impairments for coherent systems based on
phase-shift keying,” IEEE/OSA J. Lightwave Tech., vol. 27, pp. 2916-2923, 2009.
55.
S. Kumar, “Analysis of nonlinear phase noise
in coherent fiber-optic transmission systems,” IEEE/OSA J. Lightwave Tech.,
vol. 27, pp. 4722-4733, 2009.
56.
D. Yang and S. Kumar, “Realization of optical
OFDM using timelenses and its comparison with optical
OFDM using FFT,” Opt. Exp., vol. 17, pp. 13711-13726, 2009.
57.
S. Kumar and D. Wang, “Optical implementation
of orthogonal frequency division multiplexing using time lenses” Opt. Lett,
vol. 33, p. 2002, 2008.
58.
H. Wang and S. Kumar “Reduction of multi-path
interference and differential group delay using spatial filtering” App. Opt.,
vol. 47, p. 2290, 2008.
59.
D. Yang, H. Wang and S. Kumar, “Temporal
filtering for optical communication systems,” Opt. Comm., vol. 281, p. 238,
2008.
60.
A. Akhtar, L. Pavel and S. Kumar, “Modeling
Inter-channel FWM with Walk-off in RZ-DPSK Single Span Links,” IEEE/OSA Journal of Lightwave Tech.,
p. 2142, 2008.
61.
X. Zhu and S. Kumar, “Impact of Rayleigh
scattering in single source bidirectional fiber-optic systems using different
modulation formats for upstream and downstream transmission”, Opt. Fib. Tech., vol. 14, pp. 185-195, 2007.
62.
S. Kumar, “Cancellation of third order
dispersion using time reversal”, OSA journal Opt. Lett., vol. 32, pp. 346-348, 2007.
63.
S. Kumar and L. Liu, “Cancellation of
nonlinear phase noise using optical phase conjugation and dispersion
inversion”, OSA journal, Opt. Exp., vol.
15, pp. 2166-2177, 2007.
64.
X.
Zhu, S. Kumar and X. Li, “Comparison between DPSK and OOK modulation schemes in
nonlinear optical transmission systems,” OSA journal App. Opt., vol. 45, p.
6812, 2006.
65.
A.
Akhtar, L. Pavel and S. Kumar, “Modeling and analysis of channel walk-off
contributions to four wave mixing in optical transmission systems,” IEEE/OSA
Journal of Lightwave Technology, vol. 24, p. 4269, 2006.
66.
S.
Kumar, “Impact of dispersion on nonlinear phase noise,” Virtual Journal of
Ultrafast Science, Vol. 5, 2006.
67.
S.
Kumar, “Analysis of intra-channel four wave mixing in DPSK optical transmission
systems”, OSA journal Opt. Lett, vo.
30, p. 2053, Aug. 2005.
68.
A. Kobyakov, S. Kumar, D.Q. Chowdhury, A.B.
Ruffin, M.Sauer and S. Bickham, “Design concept for
optical fibers with enhanced SBS threshold”,
OSA journal, Optics Express, vol. 13, p. 5338, July 2005.
69.
S. Kumar and D. Yang, “Second order theory
for self-phase modulation and cross-phase modulation in optical fibers”,
IEEE/OSA J. Lightwave Technology, vol. 23, p. 2073-81, June 2005.
70.
S. Kumar , “Impact
of dispersion on the nonlinear phase noise in optical transmission
systems”, Opt. Lett., vol. 30, p. 3278,
2005.
71.
S. Kumar “Analysis of degenerate four wave mixing in RZ optical
transmission systems including walk-off”,
IEEE/OSA J. Lightwave Technology,
vol. 23, p. 310, Jan.2005.
72.
D. Chowdhury, M. Mlejnek and S. Kumar, “Analytic
estimation of penalty due to filter function variations in WDM systems”, IEEE
Photon. Tech. Lett., vol. 16, p.2168, Sept. 2004.
73.
S. Kumar, S. Raghavan and J. Mauro, “Impact
of modulation format and filtering on the calculation of amplified spontaneous
emission noise penalty” Journal of Optical Communications, vol.
25, p. 945, 2004.
74.
S. Kumar, “Noise suppression using dispersion
decreasing fibers for RZ transmission systems”, IEEE Photon. Techn. Lett., vol.
16, p. 810, Mar. 2004.
75.
M. Muktoyuk and S.
Kumar, “Amplitude jitter due to stimulated Raman scattering among channels of a
wavelength division multiplexed system”, IEEE Photon. Techn. Lett, vol. 15, p. 1222-1224, 2003.
76.
S. Raghavan, S. Kumar, G. Giuidice
and J. Hurley, “ASE and receiver induced penalty: Analytical models and
experimental validation in NRZ/RZ systems”, Optical Fiber Technology, vol.
9, 143-147, 2003.
77.
I. Tomkos, D.
Chowdhury, J. Conradi, C. Giroux and S. Kumar “Demonstration of Negative
Dispersion Fibers for DWDM Metropolitan Area Networks” IEEE Selcted
Topics in J. of Quantum
Electronics, vol. 7, p. 439-460,
2001.
78.
S. Kumar, “Intra-channel four wave mixing in
dispersion managed transmission systems”, IEEE Photon. Techn. Lett., vol. 13, p
800-802, August 2001.
79.
S.
Kumar, “Influence of Raman effects in wavelength division multiplexed soliton
systems”, Opt. Lett., vol. 23, p 1450-1452, 1998.
80.
S.
Kumar, M. Wald and F. Lederer, “Soliton interaction in strongly dispersion
managed fibers”, Opt. Lett., vol. 23, 1019-21, 1998.
81.
T. Hirooka, N. Takeshi, S. Kumar and A. Hasegawa, “Analyses of
ultra-fast quasi-soliton transmission systems,” Technical report of IEICE-LQE,
vol. 35, pp. 61-66, 1997.
82.
S.
Kumar and F. Lederer, “Gordon-Haus effect in dispersion managed soliton
system”, Opt. Lett., vol. 22, p. 1878-80 1997.
83.
Y. Kodama, S. Kumar and A. Maruta, “Chirped
nonlinear pulse propagation in a dispersion compensated system”, Opt. Lett.,
vol. 22, p.1689-1691, 1997.
84.
S. Kumar, Y. Kodama
and A. Hasegawa, “Optimum dispersion management for soliton WDM systems”, IEE
Electron. Lett., vol. 33, p 459-460 1997.
85.
S. Kumar, A. Hasegawa and Y. Kodama,
“Adiabatic soliton transmission in fibers with lumped amplifiers by using
dispersion management scheme”, J. Opt. Soc. Am. B, vol. 14, p. 888-894, 1997.
86.
S.
Kumar and A. Hasegawa, “Quasi-soliton propagation in dispersion managed
fibers”, Opt. Lett., vol. 22, p 372-374, 1997.
87.
S. Kumar and A. Hasegawa, “Reduction of
initial collision effects by adiabatic expansion in soliton wavelength-division
multiplexed systems”, Opt. Lett., vol. 21, p 1903, 1996.
88.
C.S.
Aparna, S. Kumar and A. Selvarajan, “Suppression of
self-frequency shift by pairing of solitons”, Opt. Comm., vol. 131, p 267,
1996.
89.
A. Hasegawa, S. Kumar and Y. Kodama,
“Reduction of collision induced timing jitter in dispersion managed soliton
transmission systems”, Opt. Lett., vol. 21, p 1903, 1996.
90.
A. Hasegawa, S. Kumar and Y. Kodama, “Adiabatic transmission of optical solitons by means of dispersion
management,”, Technical report of IEICE-LQE, pp.43-50, 1995.
91.
S. Kumar and A. Hasegawa, “Suppression of
Gordon-Haus shift by modulated Raman pump”,
Opt. Lett, vol. 20, p 1856, 1995.
92.
S. Kumar, A. Selvarajan
and G.V. Anand, “Nonlinear copropagation of two
optical pulses of different frequencies in birefringent fibers”, J. Opt. Soc.
Am. B, vol. 11, p 810, 1994.
93.
S. Kumar, A. Selvarajan
and G.V. Anand, “Influence of Raman scattering on cross-phase modulation in
optical fibers”, Opt. Comm., vol. 102, p. 329, 1993.
94.
S. Kumar, G.V. Anand and A. Selvarajan, “Spectral approach for optical solitons and
periodic solutions of nonlinear wave equation”, J. Opt. Soc. Am. B, vol. 10, p
697, 1993.
95.
S. Kumar, G.V. Anand and A. Selvarajan, “Interaction of two optical waves in a
cubically nonlinear medium resulting in Bragg diffraction”, Opt. Comm., vol.
94, p 477, 1992.
96.
S. Kumar, T. Srinivas and A. Selvarajan, “Transform Techniques for planar optical
waveguides”, J. Opt. Soc. Am. A, vol. 8, p 1681, 1991
97.
S. Kumar, T. Srinivas and A. Selvarajan, “Beam propagation method and its application to
integrated and fiber optic structures”, Pramana J. Phys., vol. 34, p. 347, 1990.
Invited
Talks/KeyNote
1. M. Khajezadeh and S. Kumar, “Bright pulse trapping by dark soliton and its harmonic oscillations in optical fibers,” Invited talk in the Symposium on 50th Anniversary of optical solitons, Kyoto, Nov. 2023.
2. S. Kumar, “Optical signal processing for fiber communication systems,” Invited talk in the Computers and Devices for Communication (CODEC)-2023, Kolkata, India, Dec. 2023. 3. S. Kumar, “Optical Back Propagation for Mitigation of Linear and Nonlinear Impairments in Optical Networks,” Invited Talk in the International Conference and Expo on Lasers, Optics and Photonics, Valencia, Spain, Nov 2022.4. S. Kumar, M. Naghshvarianjahromi and J. Deen, “Cognitive Fiber Communications,” Keynote Speech, 3rd International Symposium on AI and Electronics, Sendai, Tohoku University, Feb. 2022.5. S. Kumar, “Digital and Optical compensation of fiber nonlinear effects,” Invited Talk in the Colloquium at Institute of Optics, University of Rochester, Feb 2021.
6. S. Kumar, “Compensation of impairments in fiber optic systems,” Organized by IEEE MCE Photonics and ComSoc Chapter and IEEE Calcutta University Photonics Chapter, Mar 2021.
7. S. Kumar, “Optical Back Propagation for Fiber Optic Communication Systems,” Invited Talk in the Photonics North, Virtual conference, May 2021, sponsored by SPIE.
8. S. Kumar, “A general relativistic theory of electromagnetic field,” Invited Talk at International Conference on Einstein's argument that 'Quantum Mechanics is not a complete theory', Sept. 2020.
9. S. Kumar, “Mitigation of nonlinear impairments in fiber optic systems,” Invited Talk in International Conference on Electrical and Electronics Engineering (ICEEE), held in Rome, July 22-23, 2019.
10. S. Kumar, “Nonlinear effects in photonic
devices and systems”, Keynote speach, International
Conference on Engineering Physics and Optoelectronics Engineering, held at
Bangkok, Thailand, Apr. 2017.
11. M.T. Moghrabi, S. Kumar and M.H. Bakr, “Adjoint sensitivity of nonlinear structures using the FDTD Method", Advances in Electromagnetics Symposium (AES)-2017, held at Seoul, Korea, July 2017.
12. S. Kumar, “Nonlinear effects in photonic
devices and systems,” presentation in Research Institute of Electronic
Communication, Tohoku University, Japan, Dec. 2016.
13. S. Kumar and X. Liang, “Optical
backpropagation for mitigation of linear and nonlinear impairments in fiber
optic networks,” Invited Talk, Optics-2016, held at Atlanta, Nov. 2016.
Sponsored by OSA.
14. S. Kumar and S. K. Biswas, “Nonlinear effects in optical microcavity and their
applications,” Plenary Talk, Indo-Canadian symposium on nanoscience and
technology, Mysore, India, Feb. 2016.
15. S. Kumar and S. K. Biswas, “Nanoparticle detection using the optical
microcavity,” presentation in Ambedkar College of Engineering, Bangalore, Feb.
2016.
16. X.
Liang and S. Kumar,
“Optical and digital mitigation of fiber dispersion and nonlinearities in fiber
transmission systems,” Invited Talk, Asilomar Conference on signals, systems
and computers held at Pacific Grove, CA, Nov. 2015. Co-sponsored by IEEE.
17. S. Kumar, “Our recent activities on
fiber communication systems”, presentation at Corning Inc., New York, Oct.
2015.
18. S. Kumar, “Nonlinear effects in photonic
devices and systems”, presentation at Dept. of Electrical and Computer
Engineering, McGill University as a speaker of IEEE chapter, Aug. 2015.
19. S. Kumar, “Digital signal processing for
fiber optic communications,” Plenary Talk, Signal processing and communication
engineering systems (SPACES), held at Vijayawada, India, Jan. 2015. Sponsored
by IEEE.
20. S. Kumar, X. Liang and J. Shao, “Digital and optical compensation of optical
nonlinearities in coherent fiber optic communication systems”, Invited Talk, EMN
meeting on opto-electronics, held in Apr. 2015, Beijing, China. Sponsored by
Institute of Semiconductors (CAS) and Springer.
21. S. Kumar, “Analysis of nonlinear
impairments in fiber-optic systems”, presented to fiber-communications group of
NEC, New Jersey, USA, Feb. 2013.
22. S. Kumar, “Digital and optical back
propagation in fiber-optic systems”, presented to Dept. of Electrical and
Computer Engineering, McGill University as a speaker of IEEE chapter, Aug.
2013.
23. S. Kumar, S.N. Shahi
and J. Shao “Analysis and
compensation of nonlinear impairments in fiber optic systems,” Invited Talk in
the International conference on optical engineering (ICOE12) held in Belgaum,
India, July 2012, sponsored by IEEE.
24.
S.
Kumar, “Modeling fiber optic communication systems,” presented to Electrical
Communication Engineering, Indian Institute of Science, July 2012.
25. S.
Kumar, “Applications of space-time dualities for fiber-optic communication
systems”, Invited Talk, International Conference on Computers and Devices for
Communication (CODEC-09), held at Kolkata, India, December 16-18, 2009.
Sponsored by IEEE/LEOS.
26. S.
Kumar, “Optical Communication Systems” presented as a panelist at
“Communication theory workshop” held in
27. S.
Kumar and A.F. Evans, “Collision-induce impairments in dispersion managed fiber
systems” ” invited talk,
International ROSC conference on “TDM and WDM of soliton transmission systems”
held at
28. S.
Kumar, “Interaction of dispersion managed solitons” invited talk, Photonics
Technologies-98, sponsored by SPIE, held at New Delhi, India, Dec. 1998.
29. S.
Kumar and A. Hasegawa, “Transmission and collision of quasi-solitons” invited
talk in the international ROSC
conference on “Recent progress in soliton communications” held at
30. S.
Kumar and A. Hasegawa, “Quasi-soliton transmission in optical fibers” invited talk, International conference on “ultrashort
pulse generation and WDM applications” held at
31.
32. S.
Kumar, Y. Kodama and A. Hasegawa, “Adiabatic soliton
transmission by using a dispersion management scheme” invited talk, Lasers and
Quantum Electronics Meeting held at
33. Y.
Kodama, S. Kumar and A. Hasegawa, “Dispersion management on soliton
transmission system with lumped amplifiers” invited talk in international conference on optical solitons,
Conference
Publications
1. Y. Nasrollahzadeh, S. Kumar and M.J. Deen, “Kramers-Kronig versus self-coherent transceivers for freespace optical communications,” Oral Presentation, Photonics North, Montreal, June 2023. Sponsored by Optica and IEEE.
2. A. Yazdanpour, M. Khajezadeh and S. Kumar, “Comparison between homodyne and PNR detection schemes for quantum key distribution,” Oral Presentation, Photonics North, Montreal, June 2023. Sponsored by Optica and IEEE.3. M. Khajezadeh and S. Kumar, “Soliton trapping and harmonic oscillations due to nonlinear interaction in optical fibers,” Oral Presentation, Photonics North, Montreal, June 2023. Sponsored by Optica and IEEE. 4. Y. Nasrollahzadeh, S. Kumar and M.J. Deen, “Self-coherent vs Kramers-Kronig transceivers for FSO communications,” Poster presentation at the Optical Satellite Consortium, Ottawa, Feb 2023. Sponsored by Satellite Canada and NRC. 5. M.M.T. Maghrabi, M. H. Bakr, and S. Kumar, “Inverse Nonlinear Schrӧdinger Equation-Based Adjoint Sensitivity Analysis approach,” Oral presentation (online) in International Applied Computational Electromagnetics Society Symposium (ACES), Monterey, California, USA, IEEE, Aug 2021.
6. M. Naghshvarianjahromi,
S. Kumar, J. Deen, T. Iwaya, K. Kimura, M. Yoshida, T. Hirooka,
and M. Nakazawa, “Experimental demonstration of distortion mitigation in 15
Tbit/s OTDM transmission using a cognitive dynamic system,” oral presentation
in 26th Optical Electronics and Communications Conference, July
2021, Sponsored by OSA and IEEE.
7. R. Ramdial, X. Liang, S. Kumar, J.D. Downie and W.A. Wood, “Frequency offset estimation algorithm for a multi-subcarrier coherent fiber optical system,” Oral presentation in Photonics West, Sponsored by SPIE, Jan 2020.
8. M.T. Maghrabi, M. H. Bakr, and S. Kumar, "Nonlinear Adjoint Sensitivity Analysis of Fiber Optic Communication Systems," Poster presentation at Canada Photonics Online Meetup, Dec. 2020.
9. M. M. T. Maghrabi, M. H. Bakr, and S. Kumar, "Nonlinear Schrödinger equation-based adjoint sensitivity analysis," Oral presentation (online) in International Applied Computational Electromagnetics Society Symposium (ACES), Monterey, California, USA, IEEE, July 2020.
10. M. Naghsvarianjahromi, S. Kumar and J. M. Deen, "Brain Inspired Dynamic System for the Quality of Service Control on the Nonlinear Fiber-Optic System," Poster presentation at Canada Photonics Online Meetup, Dec. 2020.
11. M. M.T. Maghrabi, Mohamed H. Bakr and Shiva Kumar, "Linear Adjoint
Sensitivity Analysis of the Time-Dependent Schrödinger Equation," Oral
presentation in International Applied Computational Electromagnetics Society
Symposium (ACES), IEEE, March 2019, Miami, Florida, USA.
12. M. Naghsvarianjahromi, S. Kumar and J. M. Deen, “Cognitive Decision Making for the Longhaul Fiber Optic Communication Systems,” Oral presentation in Canadian workshop on information theory (CWIT), June 2-5, Hamilton, 2019.
13. M. Naghsvarianjahromi, S. Kumar and J. M. Deen, “Smart Long-haul Fiber Optic Communication Systems Using Brain-like Intelligence,” Oral presentation in Canadian workshop on information theory (CWIT), June 2-5, Hamilton, 2019.
14. E. Bidaki and S. Kumar, “Multi-stage perturbation technique based nonlinear Fourier transform for fiber optic systems,” oral presentation at Photonics North-2018 held at Montreal, 2018.
15. X.
Liang, S. Kumar, J. Downie, W. Wood and J. Hurley, “Transmission Performance of
OFDM Signals Over 6,000 km Fiber Optic Links with Digital Back Propagation”
oral presentation in Signal Processing in Photonic Communication (SPPCom) held at Zurich, Switzerland, July 2-5 2018.
16. X. Liang and S. Kumar, “Compensation of Nonlinear Noise in Fiber-optic Systems Using Multi-stage Perturbation Technique,” poster presentation at 23rd International Conference on Noise and Fluctuations (ICNF 2015), Xian, China, June 3 2015.
17. X.
Liang and S. Kumar, “A
multi-stage perturbation technique for intra-channel nonlinearity
compensation”, Optical Fiber Conference (OFC) held at Los Angeles, CA, Th3D.1,
Mar. 2015. Sponsored by IEEE and OSA.
18. X.
Liang and S. Kumar, “An
analytical XPM model for dispersion managed fiber-optic systems, Photonics
North, held in Montreal, June 2014. Sponsored by SPIE. Also appeared in
Proceedings of SPIE, vol. 9288, p. 928805-1.
19. J.
Shao, X. Liang and S.
Kumar, “An efficient scheme of split-step Fourier scheme for fiber optic
communication systems,” Photonics North, held in Montreal, June 2014. Sponsored
by SPIE. Also appeared in Proceedings of SPIE, vol. 9288, p. 928806-1.
20. Q.
Ding, X. Liang and S.
Kumar, “Comparison of LMS equalizers for PMD mitigation in polarization
multiplexed coherent fiber optic systems”, Photonics North, held in Montreal,
June 2014. Sponsored by SPIE. Also appeared in Proceedings of SPIE, vol. 9288,
p. 92880B-1.
21. S.N.
Shahi and S. Kumar, “A
multi-core WDM system with wavelength interleaving among cores” presented in
Photonics North, held in Ottawa, June 2013. Sponsored by SPIE. Also appeared in
Proceedings of SPIE, vol. 8915, p. 89150F, 2013.
22. S.N. Shahi and S. Kumar, “A
multi-core WDM system with wavelength interleaving among cores” presented in
Photonics North, held in Ottawa, June 2013. Sponsored by SPIE.
23. S.N. Shahi and S. Kumar, “Analytical
Modeling of a Single Channel Nonlinear Fiber Optic System Based on QAM”, in
IEEE/OSA signal processing in photonics communication (SPPCom)
Topical meeting, Puerto Rico, July 2013.
24. S. N. Shahi and S. Kumar, “A
multi-core or multi-fiber WDM system,” presented in International conference on
optical engineering (ICOE12) held in
Belgaum, India, July 2012, sponsored by IEEE.
25. S. N. Shahi and S. Kumar, “BER
calculation of a single channel nonlinear fiber optic system based on QPSK,”
presented in IEEE photonics conference held in San Francisco, CA, Sept. 2012.
26. M. Malekiha and S.
Kumar, “Second-Order Theory For Nonlinear Phase Noise In Coherent Fiber-Optic
System Based On Phase Shift Keying, “ presented in IEEE CCECE 2011: Symposium
on Communications and Networking, Niagara Falls, July 2011.
27. S. N.
Shahi and S. Kumar, “Reduction of nonlinear Impairments in fiber transmission
system using fiber diversity”, IEEE/OSA Signal processing in photonics
communication (SPPCom) Topical meeting, Toronto, June
2011.
28.
D. Yang and S. Kumar, “Realization of optical
OFDM using time lenses and its comparison with conventional OFDM for
fiber-optic systems”, presented in European Conference on Optical Communication
(ECOC-2009), held
in
29.
X. Zhu, S. Kumar, S. Raghavan and Y. Mauro “Nonlinear
electronic dispersion compensation techniques for optical transmission
systems,” poster presentation at optical fiber conference (OFC) held at
30.
X.
Zhu, S. Raghavan and S.Kumar, “Electronic dispersion
compensation based on maximum likelihood sequence estimation for optical
transmission systems,” oral presentation at IEEE/LEOS Summer Topicals 2007,
July 23-25 2007,
31.
H. Wang, S. Kumar and C. Xu, “Reduction of
multipath interference in a few mode fibers using spatial filters”, oral
presentation at SPIE conference on optics and photonics held at San Diego, CA,
Aug. 2007.
32.
Y. Dong and S. Kumar, “Space-Mapping Based Optimization for
Fiber-Optic Transmission Systems”, oral presentation at “Integrated Photonics
and Nanophotonics Research and Applications Topical
Meeting” held at
33. A. Akthar, S. Kumar and L. Pavel, “Impact of walk-off on
FWM in RZ-OOK transmission systems”, presented in Optical Fiber Conference
(OFC) /NFOEC 2007, held at Anaheim, CA,
March 2007. Sponsored by IEEE/OSA.
34. X. Zhu, S. Raghavan, and S. Kumar, “Electronic dispersion compensation based on maximum
likelihood sequence estimation for 10 Gb/s optical communication Systems,” Photonics North 2007, held at Ottawa, Canada,
June 2007. Sponsored by SPIE.
35.
X. Zhu, S. Raghavan, and S. Kumar,
“Electronic dispersion compensation based on maximum likelihood sequence
estimation for optical transmission systems,” accepted for oral presentation at
IEEE/LEOS Summer Topicals 2007, July 23-25 2007,
36.
X. Zhu and S. Kumar, “Comparison of the error
probability of fiber-optic transmission systems based on OOK and DPSK”,
presentation in Coherent Optical Technologies and Applications (COTA)
Topical Meeting, JWB 26, held in Whistler, British Columbia, Canada, June
2006. Sponsored by OSA.
37.
P. Zhang and S. Kumar, “Efficient time
division multiplexing scheme using solitons interaction”, presented in 23rd
Queen's Biennial Symposium on Communications, June 2006,
38.
Y. Dong and S. Kumar “Design of 160 Gb/s optical transmission
systems,” Photonics North -2005,
Toronto, Sept. 2005, sponsored by SPIE.
39.
L. Liu and S. Kumar, “Optimization of duty
cycle and filter bandwidths for optical transmission systems,” Photonics North -2005,
40. M. Muktoyuk and S. Kumar, “Impact of Raman noise transfer on
long haul transmission systems” Optical
Fiber Conference (OFC)-2003, Anaheim, CA, March 2003.
41. J.
Hurley, S. Kumar, J. Mauro, S. Raghavan, and S. Ten, “Critical issues in
modeling of linear and nonlinear impairments in WDM systems”, Optical Fiber Conference-2003 Anaheim, CA,
March 2003.
42. S.
Burtsev, S. Kumar, G. Luther and D. Lambert, “Modeling of high bit rate RZ
systems” Optical Fiber Conference (OFC)-2001 Anaheim, MF2-MF2, March 2001.
43. S.
Kumar, G. Luther and J. Hurley, “Finite bandwidth theory and experiment for
four wave mixing in RZ systems”, OFC-2001 Anaheim, CA, March 2001.
44. M.
Sharma,
45. S.
Kumar and F. Lederer, “Dispersion managed solition
transmission in optical fibers”, International CLEO conference, San Francisco,
March 1998.
46. S.
Kumar and A. Hasegawa, “Soliton control by four wave mixing” presented in IEICE
conference in Tokyo, Aug. 1995.
47.
48. S.
Kumar, T. Srinivas and A. Selvarajan, “Modifications
over beam propagation algorithms for the design of optical waveguides”,
presented in the international SPIE conference- 1991 held at Bangalore, India.
49. S.
Kumar, T. Srinivas and A. Selvarajan, “Design of
waveguide couplers using the beam propagation method”, presented in the OSI
conference held in Chandigarh, India, March 1989.
Patents awarded:
1.
2.
3. US patent #7027735, “Unequal pulse spacer to improve the quality
of transmission,”
4. US
Patent #1,620,960, “Large
effective area high SBS threshold optical fiber,” S. Bickham, D. Chowdhury, M. Howard, S Kumar, D. Ma, S.K. Mishra and B. Ruffin,
2006.
5. US
Patent, #6952519, “High Stimulated
Brillouin Scattering (SBS) threshold
fiber,” S. Bickham, D. Chowdhury, S. Kumar, B. Ruffin and S. Ten , patent
awarded Oct. 2005.
6. US
Patent #10/613,966, “Optical communication system and method,” M. Ajgaonker, A. Kobyakov, J-K. Rhee, M. Sharma, I. Tomkos, M. Vasilyev, J. M. Grochocinski,
S. Kumar and G.G. Luther, 2003.
7. US
Patent # 091/852173, “Optical fibers having cores with different propagation
constants, and methods of manufacturing the same,”S. Kumar,U.
Manyam and V.Srikant, patent awarded in August 2003.
8. US
Patent # 06671445, “Dispersion slope compensating optical fiber,” S. Bickham,
M. Cain, S. Kumar, S.K. Mishra, V. Srikant and J. Stone, patent awarded in Dec
2003.
9.
10. US Patent #60/152,437 ,
“Negative Dispersion Single Mode Waveguide Fiber for Metro networks” , J.
Conradi, S. Kumar and S. Rosenthal,
awarded Aug. 2002.