PUBLICATIONS IN JOURNALS
1. Joonhoi Koo, Nandam Ashok, Dong Hwan Kim, and Woojin Shin “Bi2Te3 Topological Insulator for Domain-Wall Dark Pulse Generation from Thulium-Doped Fiber Laser” Crystals, Vol. 9, pp.1-7, 2019.
2. Nandam Ashok, and Woojin Shin, “Spiral photonic crystal fiber structure for supporting orbitl angular momentum modes” Optik Vol. 169, pp. 361-367, 2018.
3. Nandam Ashok, and Woojin Shin, “Effective D-shape fiber with air hole assistant design for birefringence analysis” Optik Vol. 162, pp. 27-34, 2018.
4. Nandam Ashok, Yeung Lak Lee and Woojin Shin, “Chalcogenide waveguide structure for dispersion in mid-infrared wavelength” Japanese Journal of Applied Physics Vol. 56, 032501, 2017.
5. Nandam Ashok, Minwan Jung, Yeung Lak Lee, and Woojin Shin, “Reverse ridge silicon strip waveguide and silica slot waveguide structure for the dispersion at 1550 nm” IEEE Photonics Journal, Vol. 8, 7102609, 2016.
6. Nandam Ashok, Yeung Lak Lee, and Woojin Shin, “Design and study of strip-slot waveguide structure for dispersion analysis” IEEE Photonics Journal, Vol. 8, 2700408, 2016.
7. N. Ashok, V. Rastogi, “Design and study of trench-assisted long-period waveguide Grating based gain flattening filter for erbium-doped waveguide amplifier,” Journal of Optics, vol. 45, 285, 2016.
8. Vidhi mann, Nandam Ashok and Vipul Rastogi, “Coupled strip-slot waveguide design for dispersion compensation” Optical and Quantum Electronics Vol. 47, 3161, 2015.
9. N. Ashok, V. Rastogi, and A. Kumar, “Long-period-grating in a trench assisted planar optical waveguide,” Applied Optics, Vol. 52, pp. 1954-1962, (2013).
10. N. Ashok, and V. Rastogi “Dual core leaky waveguide based filters for erbium-doped waveguide amplifier,” Fiber and Integrated Optics Vol. 32, pp.242-250, 2013.
11. N. Ashok, V. Rastogi, and A. Kumar, “Dual-core leaky optical waveguide as an Integrated optic polarizer,” Optics Communications, Vol. 285, pp. 5094-5099, 2012.
12. V. Rastogi, N. Ashok, and A. Kumar, “Design and analysis of large-core high-GVD planar optical waveguide for dispersion compensation,” Applied Physics B, Vol. 105, pp. 821-824, 2011.
Papers Presented in Conferences
1. N. Ashok, V. Rastogi, and A. Kumar, “Design and analysis of dual – core dispersion compensating waveguide,” 15th Optoelectronics and communications Conference (OECC 2010), 5-9 July 2010, Sapporo, Japan.
2. Vipul Rastogi, Prince Gupta, N. Ashok, and Ajeet Kumar, “Waveguide polarizer based on dual-core leaky structure,” International conference on fiber optics and photonics (Photonics 2010), 11-15 Dec 2010, IIT Guwahati, Guwahati, India.
3. N. Ashok, and V. Rastogi, “Design and analysis of dual-core leaky waveguide gain flattening filters for erbium doped waveguide amplifier,” International conference on Frontires in Optics and Photonics, pp.160 3-5 Dec 2011, IIT Delhi, Delhi, India.
4. N. Ashok, and V. Rastogi, “Dual-core leaky waveguide gain flattening filter for erbium doped waveguide amplifier,” National conference on Advances in Physics, pp. 92-93, 25-26 Feb 2012, IIT Roorkee, Roorkee, India.
5. N. Ashok, V. Rastogi, “Design of long-period waveguide grating based gain flattening filter for EDWA,” International conference on fiber optics and photonics (Photonics 2012), 9-12 Dec 2012, IIT Madras, Chennai, India.
6. N. Ashok, and V. Rastogi, “Slot optical waveguide dispersion compensator” Workshop on Recent Advances inPhotonics (WRAP-2013), 17-18 Dec 2013, IIT Delhi, Delhi, India.
7. N. Ashok, V. Rastogi, and V Mann “Design and analysis of coupled strip-slot waveguide structure for dispersion compensation,” The XXII International workshop on Optical Waveguide Theory and Numerical Modelling (OWTNM 2014), 27-28 June 2014, Nice, France.
8. N. Ashok, Yeung Lak Lee, and Woojin Shin, “Design of GeAsSe Strip and Silica Slot Waveguide for Dispersion” Photonics Conference 2015, 2-4 December 2015Pheonix Park, Pyongchang, South Korea.
9. N. Ashok, Yeung Lak Lee, and Woojin Shin, “Flat dispersion of GeAsSe strip and slot waveguide” Photonics Conference 2015, 2-4 December 2015Pheonix Park, Pyongchang, South Korea.
10. N. Ashok, and V. Rastogi, International OSA Network of Students (IONS-1) Conference, 1-2 Dec, 2011, IIT Delhi, Delhi, India.
11. Nandam Ashok, Yeung Lak Lee, and Woojin Shin, “Highly negative dispersion strip and slot coupled waveguide for dispersion compensation” International conference on fiber optics and photonics (Photonics 2016), 4-8 Dec 2016, IIT Kanpur, Kanpur, India.
12. Nandam Ashok, Minwan Jung, Yeung Lak Lee, and Woojin Shin, “Multilayer chalcogenide structure for low dispersion” International conference on fiber optics and photonics (Photonics 2016), 4-8 Dec 2016, IIT Kanpur, Kanpur, India.
13. Nandam Ashok, Seungryong Han, Yeung Lak Lee and Woojin Shin, “Cladding pump light stripper study for high power fiber laser applications” SPIE PHOTONICS WEST 2017, 28 January - 2 February 2017, San Francisco, California, United States.
14. ChangHyun Jung, ChiHwan Ouh, Ashok Nandam, Seungryong Han, and Woojin Shin, “All normal dispersion fiber with large mode area at 2 micron wavelength” SPIE PHOTONICS WEST 2017, 28 January - 2 February 2017, San Francisco, California, United States.
15. Nandam Ashok, Yeung Lak Lee and Woojin Shin, “GeAsSe chalcogenide slot optical waveguide ring resonator for refractive index sensing” The 25th International Conference on Optical Fiber Sensors (OFS-25), April 24- 28, 2017, Jeju, South Korea.
WORKSHOPS ATTENDED
1. Indo-UK workshop on Microstructure optical fiber 27-28 March 2010, Jaipur, India.
2. UKIERI project workshop on micro structured optical fibers and contemporary research trends in photonics 15-16 Dec 2011, Kochi, Kerala, India.