Amir Tehranchi

Post-Doc Fellow

Amirhossein Tehranchi received the B.Sc. (1997) and M.Sc. (2000) degrees in Electrical Engineering from K. N. Toosi University of Technology, Tehran, Iran. In 2000, he joined the Iran Telecom Research Center as a faculty member, where he was also involved in research on modulation instability and solitons in optical fibers, and design and fabrication of integrated optics for 6 years.

In January 2006, he started his Ph.D. studies particularly on broadband quasi-phase-matched wavelength converters, under the supervision of Prof. Raman Kashyap at École Polytechnique, University of Montreal and received his Ph.D. degree in Electrical Engineering in June 2010. Afterwards, he worked as a research associate.

Starting from September 2011, he is a post-doctoral fellow at INRS-EMT in Prof. Morandotti’s group, having received an FQRNT fellowship in the first rank.

 

 

Research Interests:

His research includes all-optical ultrafast signal processing using broadband wavelength conversion techniques based on engineered second-order nonlinearity in lithium niobate and third-order nonlinearity in engineered silicon nano-waveguides. His project currently focuses on the control of the stimulated Raman scattering effect in Kerr media using special pump pulses (e.g., Airy pulses) and its application. He has one granted patent and more than 55 publications.

 

 

Patents

  1. Kashyap, and A. Tehranchi (2011) Quasi-phase-matched wavelength converters, USPTO Application # 12/855,477.

 

 

Honors and Awards

 

  1.  Winner (in the first rank) of a 2-year FQRNT postdoctoral fellowship from the Quebec Government, Canada, 2011-2013, ($60,000).

 

  1.  PhD Scholarship, Ecole Polytechnique, University of Montreal, Canada, 2006-2010, ($100,000)

 

  1.  Winner of the 2010 John Kiel Scholarship from SPIE – The International Society for Optics and Photonics – in April 2010, ($10,000).

 

  1.  Winner of the SPIE Scholarship in optical science and engineering in April 2009, ($2,000).

 

  1.  Winner of the travel award from the Canadian Institute for Photonic Innovations (CIPI) for attendance at NP in June 2010, ($1,000).

 

  1. Winner of the SPIE Scholarship in optical science and engineering in April 2009, ($2,000).

 

  1. Winner of the travel award from the Canadian Institute for Photonic Innovations (CIPI) for attendance at NP in June 2010, ($1,000).

 

  1. Winner of the Charles Baskin Scholarship from Ecole Polytechnique, University of Montreal, Canada, February 2009, ($1,500).

 

  1.  Winner of the URSI Student Award from the Canadian National Committee (CNC) of the International Union of Radio Science (URSI) in May 2008,($1,000).

 

  1. Winner of the Young Scientist Award at the Maastricht (27th) General Assembly of URSI in August 2002, the Netherlands, ($3,000).

 

  1. Winner of the SFO grant for participation in the Nanophotonics Summer School in France, April 2004, ($500).

 

  1. Winner of the PCIC grant for participation to the European Symposium on Photonic Crystals (ESPC) in Poland, April 2002, ($500).

 

  1. Winner of the ITRC travel grants (10 times) for participation in the international conferences, 2001-2005, ($20,000).

 

 

Contacts 

Ultrafast Optical Processing Group
INRS-EMT Université du Québec
1650, boul. Lionel-Boulet, Varennes, QC J3X 1S2, Canada

 

 

Selected Journal Publications

 

  1. M. Ahlawat, A. Tehranchi, K. Pandiyan, M. Cha, and R. Kashyap, “Tunable all-optical wavelength broadcasting in a PPLN with multiple QPM peaks,” Optics Express. 20: 27425-27433, 2012.

 

  1. A. Bostani, A. Tehranchi, and R. Kashyap, “Engineering of effective second-order nonlinearity in uniform and chirped gratings,” JOSA B. 29: 2929-2934, 2012.

 

  1. A. Tehranchi, and R. Kashyap, “Flattop efficient cascaded ?(2) (SFG + DFG) based wideband wavelength converters using step-chirped gratings,” IEEE Journal of Selected Topics in Quantum Electronics. 18: 785-793, 2012.

 

  1. A. Tehranchi, R. Morandotti, and R. Kashyap, “Efficient flattop ultra-wideband wavelength converters based on double-pass cascaded sum and difference frequency generation using engineered chirped gratings,” Optics Express. 19: 22528–22534, 2011.

 

  1. M. Ahlawat, A. Tehranchi, and R. Kashyap, “Ultrabroadband flattop wavelength conversion based on cascaded sum frequency generation and difference frequency generation using pump detuning in quasi-phase-matched lithium niobate waveguides,” Applied Optics. 50: E108-111, 2011.

 

  1. A. Tehranchi, and R. Kashyap, “Improved cascaded SFG + DFG wavelength converters in low-loss QPM lithium niobate waveguides,” Applied Optics. 48: G143-7, 2009.

 

  1. A. Tehranchi, and R. Kashyap “Efficient wavelength converters with flattop responses based on counterpropagating cascaded SFG + DFG in low-loss QPM LiNbO3 waveguides,” Optics Express. 17: 19113–19119, 2009.

 

  1. A. Tehranchi, and R. Kashyap, “Response flattening of efficient broadband wavelength converters based on cascaded sum- and difference frequency generation in periodically poled lithium niobate waveguides,” IEEE Journal of Quantum Electronics. 45: 1114-1120, 2009.

 

  1. A. Tehranchi, and R. Kashyap, “Novel designs for efficient broadband frequency doublers using singly pump-resonant waveguide and engineered chirped gratings,” IEEE Journal of Quantum Electronics.  45: 187-194, 2009.

 

  1. A. Tehranchi, and R. Kashyap “Engineered gratings for flat broadening of second-harmonic phase-matching bandwidth in MgO-doped lithium niobate waveguides,” Optics Express. 16: 18970-18975, 2008.

 

  1. A. Tehranchi, and R. Kashyap, “Design of novel unapodized and apodized step-chirped quasi-phase matched gratings for broadband frequency converters based on second harmonic generation,”  IEEE Journal of Lightwave Technology. 26: 343-349, 2008.

 

Selected Conference Publications

 

  1.  A. Bostani, A. Tehranchi, R. Morandotti, R. Kashyap, “Apodization of broadband SHG response in an aperiodically poled lithium niobate using a tightly-focused Gaussian beam,” In Proceedings of Photonics North. June 6-8, 2012, Montreal, Canada.

 

  1. M. Ahlawat, A. Tehranchi, K. Pandiyan, M. Cha, and R. Kashyap, “Tunable Wavelength Broadcasting in a PPLN with Multiple QPM Peaks,” In Proceedings of Nonlinear Photonics. July 17-22, 2012, Colorado, USA.

 

  1. A. Bostani, A. Tehranchi, R. Kashyap, “Engineering of apodized chirped gratings based on desired second-order nonlinearity function,” In Proceedings of Nonlinear Photonics. July 17-22, 2012, Colorado, USA.

 

  1. A. Tehranchi, and R. Kashyap, “Efficient ultra-wideband wavelength Converters based on double-pass cascaded SFG + DFG using engineered QPM gratings,” In Proceedings of NLO 2011, July 17-22, Kauai, USA.

 

  1. A. Tehranchi, M. Ahlawat, C.-Q. Xu, and R. Kashyap, “Novel techniques for guided-wave wavelength conversion,” In Proceedings of the 16th OptoElectronics and Communications Conference (OECC) 331-332, July 4-8, 2011, Kaohsiung, Taiwan (Invited).

 

  1. A. Tehranchi, and R. Kashyap, “Flattop wideband wavelength converters based on cascaded sum- and difference-frequency generation using step-chirped gratings,” In Proceedings of SPIE Photonics West (LASE 2011), 7917-48, Jan. 22-27, 2011, San Francisco, USA.

 

  1. A. Tehranchi, and R. Kashyap, “Pump-detuned double-pass cSFG/DFG-based wavelength converters in lossy PPLN waveguides,” In Proceedings of 2010 Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP) and Nonlinear Photonics (NP), NTuC21, June 21-24, 2010, Karlsruhe, Germany.

 

  1. A. Tehranchi, and R. Kashyap, “High-efficiency pump-resonant quasi-phase-matched frequency doublers with flat broadband responses,” In Proceedings of the International Symposium on SPIE Photonic Devices + Applications. vol. 7420, August 2-6, 2009, San Diego, California, USA.

 

  1. R. Kashyap, A. Tehranchi, and C.-Q. Xu, “Efficient Broadband Frequency Conversion Using Engineered Apodized ?(2) Gratings and Fundamental Harmonic Resonance,” In Proceedings of the 14th OptoElectronics and Communications Conference (OECC). TuG6, July 13-17, 2009, Hong Kong (Invited).

 

  1. A. Tehranchi, and R. Kashyap, “Novel step-chirped quasi-phase matched gratings for flatly broadband frequency doublers with high efficiency in nonlinear-optic waveguides,” In Proceedings of the 29th General Assembly of the International Union of Radio Science (URSI), D02a.5, August 7-16, 2008, Chicago, Illinois, USA.

 

  1. A. Tehranchi, and R. Kashyap,  “A new design of apodized step-chirped gratings for broadband wavelength converters,” In Proceedings of the Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP) and Nonlinear Photonics (NP), JMD30, Sep. 2-6, 2007, Quebec City, Canada.

Research Project

Generation of Raman Solitons Using Airy Pump Pulses:

Although stimulated Raman scattering (SRS) with short pump pulses in optical fibers has been extensively studied in the past, most previous studies used intense optical pulses with symmetric temporal profiles such as Gaussian or hyperbolic secant pulses. Recently introduced in optics literature, Airy pulses have been proposed with their amplitude envelopes defined in terms of Airy functions of time, as temporal analogues of Airy beams. Generation of Raman solitons, based on SRS in fibers, using truncated Airy pump pulses rather than Gaussian ones with the same peak powers and pulse widths is under investigation.

 

Evolution of a Raman soliton using an Airy pump pulse.

 

 

References

[1]  G. A. Siviloglou and D. N. Christodoulides, Accelerating finite energy Airy beams, Opt. Lett. 32, 979 (2007).

[2]  A. Chong, W. Renninger, D. N. Christodoulides, and F. W. Wise, Airy–Bessel wave packets as versatile linear light bullets, Nat. Photonics 4, 103 (2010).

[3]  Y. Hu, M. Li, D. Bongiovanni, M. Clerici, J. Yao, Z. Chen, J.Azaña, and R. Morandotti, Spectrum to distance mapping via nonlinear Airy pulses, Opt. Lett. 38, 380 (2013).

[4]  S. Batz and U. Peschel, Diametrically driven self-accelerating pulses in a photonic crystal fiber, PRL 110, 193901 (2013).