journal papers
F. Shashahani and V. Ahmadi, "Analysis of Relative Intensity Noise in Tapered Grating QWS-DFB Laser Diodes by using Three Rate Equations Model", Solid-State Electronics, Vol. 52, No. 2, pp. 857-862, 2008. DOI:10.1016/j.sse.2008.01.014
N. Bajdanzadeh, V. Ahmadi, F. Shashahani, and H. Ghafoorifard" Dynamic Response of QWS-DFB Lasers with Convex Tapered Grating Structure and Non-Zero Facet Reflection", Solid-State Electronics, Vol. 52, No. 2, pp. 221-226, 2008. DOI:10.1016/j.sse.2007.09.004
K. Abedi, V. Ahmadi, E. Darabi, M. K. Moravvej, and M. H. Sheikhi," Design of a Novel Periodic Asymmetric Intra-Step-Barrier Coupled Double Strained Quantum Well Electroabsorption Modulator at 1.55 um", Solid-State Electronics, Vol. 52, No. 2, pp. 312-322, 2008. DOI:10.1016/j.sse.2007.08.018
M. Razaghi, V. Ahmadi, and A. Zarifkar, "Dynamic Analysis of Semiconductor Laser Amplifier Using Transfer Matrix Method", Modarres Technical and Engineering, No. 26, 2007.
E. Darabi, V. Ahmadi, K. Mirabbaszadeh, " Numerical Analysis of an Optoelectronic Integrated Device Composed of Coupled Periodic MQW Phototransistor and Strained-QW Laser Diode", Solid State Electronics, Vol. 50, PP. 473-479, 2006. DOI:10.1016/j.sse.2006.02.007
G. Abaeiani, V. Ahmadi, K. Saghafi, " Design and Analysis of Resonant Cavity Enhanced-Waveguide Photodetector Microwave Photonic Applications," IEEE Photonics Technology Letter, Vol. 18, No. 15, PP. 1597-1599, 2006. DOI:10.1109/LPT.2006.879554
K. Saghafi, M. K. Moravvej, V. Ahmadi, "The Effects of the Semiconductor Properties and MESFET Structure on Electron Transport Characteristics-Monte Carlo Analysis", Modares Technical and Engineering Scientific Research J., No. 22, PP. 11-22, 2005.
E. Mortazy, F. Shahshahani, V. Ahmadi, A. Tehranchi, M. K. Moravvej, " The Effect of Grating Structure on Relative Intensity Noise in DFB Laser Diode", SPIE Proc. Vol. 5468, PP. 154-164, 2004.
K. Saghafi, M. K. Moravvej, V. Ahmadi, "An Improved Monte Carlo Method for Electron Transport in Low Electric Field for Degenerate Semiconductors," Daneshvar, Scientific-Research Journal, PP. 1-10, March 2003 (in Persian).
E. Mortazy, V. Ahmadi, M. K. Moravvej, "Circuit Modeling and Measurement of Noise for Semiconductor Laser Diode," J. of Faculty of Engineering, Tabriz University, Vol. 29, No. 1, 2003.
K. Saghafi, M. K. Moravvej, V. Ahmadi, "d-Doped LDD MESFET with Heterostructure," Modares Technical and Engineering Scientific Research J., Autumn, 99-103, 2003 (in Persian).
A. Zarifkar, M. K. Moravvej, V. Ahmadi, "Numerical Analysis for Side Mode Effects on the Noise Characteristics of Semiconductor Laser Diodes," Int. Journal of Engineering, University of Science & Eng., Vol. 14, No. 1, PP. 23-44, 2003 (in Persian).
M. H. Sheikhi, V. Ahmadi, M, K. Moravvej, "Physical Modeling for Transient Response of Voltage-Tunable Optoelectronic Integrated Functional Device," Physica Status Solidi (C), Vol. 0, No. 3, 961- 966, 2003.
A. Banoushi, V. Ahmadi, S. Setayeshi, "An Analytical Approach to Study the Effect of Carrier Velocities on the Gain and Break down Voltage of APD," IEEE J. of Light wave Tech., Vol. 20, No. 4, PP. 696-699, 2002. DOI:10.1109/50.996591
F. Shahshahani, V. Ahmadi, K. Mirabbaszadeh, "Concave Tapered Grating Design of DFB Laser at High Power Operation for Reduced Spatial Hole-Burning Effect," Material Science Engineering B, Vol. B96, PP. 1-7, 2002. DOI:10.1016/S0921-5107(02)00238-6
M. H. Sheikhi, V. Ahmadi, M. K. Moravvej, "A Physical Model for Characteristics of an Optical Amplifier-switch Integrated Device," Iranian J. of Science & Technology, Trans. B, Vol. 26, No. B4, 665- 673, 2002.
E. Mortazy, V. Ahmadi, M. K. Moravvej, "An Integrated Equivalent Circuit Model for Relative Intensity Noise and Frequency Noise Spectrum of a Multimode Semiconductor Laser ," IEEE J. Quantum Electronics Vol. 38, No. 10, PP. 1366-1371, 2002. DOI:10.1109/JQE.2002.802975
F. Emami, M. K. Moravvej, V. Ahmadi, "Analysis of Grating Dimentions on Ridge Waveguide DFB-LD Characteristics," Int. Journal of Engineering, University of Science & Eng., Vol. 13, No. 3, PP. 21-32, 2002 (in Persian).A. Banoushi, V. Ahmadi, S. Setayeshi, "Frequency and Temporal Response of an SAM-APD," Amir-Kabir Scientific and Research J., Vol. 53, PP. 122-130, 2002 (in Persian).
F. Shahshahani, V. Ahmadi, K. Mirabbaszadeh, "The Effects of Grating Phase and Facets Reflections on the Optical Field Inside Semiconductor QWS-DFB Laser Diode," Modares Technical and Engineering Scientific Research J., No. 7, PP. 1-12, 2002 (in Persian).
V. Ahmadi, E. Mortazy, A. Zarifkar, M. K. Moravvej, "Measurement and Analysis of Intensity and Phase Noise in Telecommunication Multimode Laser Diodes," Amir-Kabir Scientific and Research J., Vol. 53, PP. 249-258, 2002 (in Persian).
V. Ahmadi, H.H. Sheikhi, M.K. Moravej, "Numerical Analysis for Static and Dynamic characteristics of an Optical Amplifier-Switch," Scripta Materialia, Vol. 44, No. 59, PP. 1207-1212, 2001. DOI:10.1016/S1359-6462(01)00686-8
M. Joodaki, G. Kompa, V. Ahmadi, M. K. Moravvej," Using Neural Network for High Resolution Distance Measurement in PLR." SPIE Proc., Vol. 4471, PP. 180-189, 2001.
M. K. Moravvej, A. Zarifkar, V. Ahmadi, "Analysis of the Noise in Single Mode Semiconductor Laser Diodes," Amir-Kabir Scientific and Research J., Vol. 48, PP. 449-437, 2001(in Persian).
V. Ahmadi, S. Noda, and A. Sasaki, "Analysis for Relative Intensity Noise of Optoelectronic Integrated Device by Heterojunction Phototransistor and Laser Diode," Solid State Electronics, Vol. 41, No. 3, PP. 465-471, 1997. DOI:10.1016/S0038-1101(96)00146-3
V. Ahmadi, S. Noda, and A. Sasaki, "Optical Multi stable Set-Reset Functional Integrated Device Composed of Six Heterojunction Phototransistors and Two Laser Diodes," Solid State Electronic, Vol. 38, No.3, PP. 551-558, 1995. DOI:10.1016/0038-1101(94)00135-3
V. Ahmadi, S. Noda, and A. Sasaki, "2-D Simulation and New Structure of HPT for Integrated Device in Optoelectronic Integrated Devices," Optical Review, Vol. 2, No. 2, PP. 120-122, 1995.

Conference Papers
A. Pishini, M. K. Moravvej-Farshi, Ebnali-Heidari and V. Ahmadi, “Femtosecond Soliton Generation and Comparison in Various Nonlinear Optical Loop Mirror (NOLM) Structures”, ICOCN 2007, Islamabad, Pakistan, 2007.
S. Masudy Panah, V. Ahmadi, “Effect of Scattering Loss on Gain and Noise of Double Carrier Multiplication APD”, ICOCN 2007, Islamabad, Pakistan, 2007.
V. Ahmadi, K. Abedi, E. Darabi, “ New Asymetric Quantum Well Traveling-Wave Electroabsorption Modulator with Very Low Insertion Loss and High Extinction Ratio”, Proc. of 9th International Conf. on Transparent Optical Networks ICTON2007, PP. 251-256, 2007.
G. Abaeiani, V. Ahmadi, K. Sghafi, “ New Asymetric Quantum Well Traveling-Wave Electroabsorption Modulator with Very Low Insertion Loss and High Extinction Ratio”, Proc. of 9th International Conf. on Transparent Optical Networks ICTON2007, PP. 251-256, 2007.
A. Seyyed Faraji, V. Ahmadi, M. Noushravani, F. Gity, “Numerical Analysis of Filamentation in Conventional Double Heterostructure and Quantum Well High -Power Broad Area Laser DiodeArea Laser Diod, “ ICSE-2006, Malaysia, Kuala Lampur, Dec. 2006.
E. Soudi, V. Ahmadi, “A Versatile HSPICE Electro-Opto-Thermal Circuit Model for Vertical-Cavity Surface-Emitting Lasers, “ ICSE-2006, Malaysia, Kuala Lampur, Dec. 2006.
E. Soudi, V. Ahmadi, “Static Quasi 3D Thermal Simulation of Ion-Implanted Vertical-Cavity Surface-Emitting Lasers, “ ICSE-2006, Malaysia, Kuala Lampur, Dec. 2006.
M. Gandomkar, V. Ahmadi, “Modelling and Analysis of a Piezo-Optic Microstructure, “Internation Conf. on Bio-Nanotechnology, ICBN2006, 2006.
E. Rahimian, V. Ahmadi, “Analysis of Gain in Compressive Strained GaAs/AlGaAs Laser Diodes, “Iranian Physics Conference, Shahrood, August 2006.
A. Seyyed Faraji, V. Ahmadi, M. Noushiravani“Analysis of Filamentation Effect in High Power Single Quantum Well Laser Diodes, “13th Conf. on Optics and Photonics,” Tehran, Iran, Feb. 2006.
G. Abaeiani, V. Ahmadi, “Structural Design od Silicon Resonant Cavity Enhanced Waveguide Photodetectors, “ 13th Conf. on Optics and Photonics,” Tehran, Iran, Feb. 2006.
V. Ahmadi, F. Shahshahani, “Effects of Nonuniform Gratings on RIN of DFB Semiconductor Lasers, “ 13th Conf. on Optics and Photonics,” Tehran, Iran, Feb. 2006.
V. Ahmadi, E. Darabi, "Analysis for Dynamic Characteristics and Relative Intensity Noise of a New Polarization -Insensitive Quantum Well Optoelectronic Integrated Device," Proc. of 8th International Conf. on Transparent Optical Networks ICTON2006, PP. 151-156, 2006.
S. Sefolah Poor, V. Ahmadi, M. K. Moravvej, “Circuit Model for Analysis of Gain Spectrum and Power Satuartion in Asymmetric MQW-SOA “ 15Th ICEE2006, Proceeding, 109-114, 2006 (Persian).
M. Razzaghi, A. Zarifkar, V. Ahmadi, “Calculation of Dynamic Gain and Carrier Density in Semiconductor Laser Amplifier Using Transfer Matrix Method,” 13th ICEE2005, Proceeding Vol. 1, Zanjan, Iran, May 10-12, 2005 (in Persian).
S. Seifollapoor, H. Rasooli-Baghaei, V. Ahmadi, “Circuit Model for Analysis of Static Operation of VCSEL,” 13th ICEE2005, Proceeding Vol. 1, Zanjan, Iran, May 10-12, 2005 (in Persian).
M. H. Yavari, V. Ahmadi, A. Zarifkar, “Analysis of Optoelectronic Integrated 3-Segment DBR Tunable Semiconductor Laser Using Coupled Mode Method,” 13th ICEE2005, Proceeding Vol. 1, Zanjan, Iran, May 10-12, 2005 (in Persian).
M. H. Yavari, V. Ahmadi, A. Zarifkar, K. Abedi, “Simulation of Photon Density Distribution in Three Section DBR Tunable Laser Diode Based on the Transfer Matrix Method,” 2nd Int. Conf. on Advanced Optoelectronics and Lasers, CAOL 2005, Proceeding Vol.1, Yalta, Ukraine, 12-17 Sept. 2005.
E. Darabi, V. Ahmadi, K. Mirabbaszadeh, “Analysis for the Characteristics of a Voltage Tunable Functional Quantum Structure Optoelectronic Integrated Device,” 2nd Int. Conf. on Advanced Optoelectronics and Lasers, CAOL 2005, Proceeding Vol.2, Yalta, Ukraine, 12-17 Sept. 2005.
K. Abedi, V. Ahmadi, S. Golmohammadi, E. Darabi, M. H. Yavari, “Soliton Solution of Nonlinear Application to Bose-Einstein Condensation Using the FD Method,” CAOL 2005, Proceeding Vol.2, Yalta, Ukraine, 12-17 Sept. 2005.
M. Razzaghi, A. Zarifkar, B. Hadian, V. Ahmadi, “Calculation of the Spontaneous Emission Spatial Dependency in Semiconductor Laser Using Transmission Line Model,” 7th Int. Conf. on Laser and Fiber-Optic Networks Modeling, LFNM 2005, Yalta, Ukraine, 12-17 Sept. 2005.
M. H. Yavari, V. Ahmadi, F. Shahshahani, M. Razaghi, “Numerical analysis of three section distributed Bragg reflector tunable laser diode with modified oscillation condition based on the transfer matrix method,” Wireless and Optical Communications Networks, WOCN 2005, Second IFIP International Conference, UAE, Dubai, Page(s):187 – 191, 6-8 March 2005.
M. Razaghi, V. Ahmadi, K. Farahani, A. Zarifkar, M. Soroosh, M. K. Moravvej-Farshi, “Investigation of transient amplified spontaneous emission in semiconductor laser amplifier,” Wireless and Optical Communications Networks, WOCN 2005, Second IFIP International Conference, UAE, Dubai, Page(s):178 – 181, 6-8 March 2005.
V. Ahmadi, "Quantum Structure Semiconductor Optoelectronic Devices," Proc. of the 12th Conf. on Optics and Photonics, Shiraz, P. 33, 2005.
M. H. Yavari, V. Ahmadi, A. Zarifkar, “Analysis of Three-Section Distributed Bragg Reflector Tunable Laser Using Coupled Mode Theory ,” ICEE2005, Zanjan, 59-64, May, 2005 (in Persian).
M. Razzaghi, A. Zarifkar, V. Ahmadi, “ Dynamic Analysis of Gain and Carrier Concentration in Laser Diode Using Transfer Matrix Methode,” ICEE2005, Zanjan, 97-102, May, 2005 (in Persian).
S. Seifolah Poor, H. Rasooli, V. Ahmadi, “ A Circuit Model for Static Analysis Of VCSEL,” ICEE2005, Zanjan, 7-11, May, 2005 (in Persian).
F. Shahshahani, V. Ahmadi, "Analysis of the External Optical Feedback On the Stability of QWS-DFB Semiconductor Laser," Proc. Of the 12th Conf. on Optics and Photonics, Shiraz, PP. 239-243, 2005 (in Persian).
N. Bajdanzadeh, F. Shahshahani, H. Ghafoorifard, V. Ahmadi, " Analysis of the Non-uniform Grating Structure on the Frequency Response of QWS-DFB Semiconductor Laser," Proc. Of the 12th Conf. on Optics and Photonics, Shiraz, PP. 245-249, 2005 (in Persian).
K. Abedi, V. Ahmadi, M. K. Moravvej, M. H. Sheikhi, F. Gity, M. H. Yavari, " Circuit Simulation of Segmented Traveling Wave Electroabsorption Modulator Using HSPICE," ICOCN2005, Bangkok, 2005.
F. Gity, V. Ahmadi, M. Noushiravani, K. Abedi, A. Noorafkan, " Modeling and Numerical Analysis of Static and Dynamic Characteristics of GaAs/AlGaAs SQW High Power Diode Lasers Considering Thermal Effects," ICOCN2005, Bangkok, 2005.
B. Eftekhari, V. Ahmadi, “2-Dimensional Simulation and Analysis for Liquid Phase Epitaxy of III-V semiconductor Binary Compound Layers: InP and GaAs,” Int. Conf. on Physics, Proceedings, Tehran, Iran, 6-9 Jan. 2004.
M. Razzaghi, A. Zarifkar, M. Soroosh, V. Ahmadi, “Steady State Distributed Equivalent Circuit Model for Semiconductor Laser Amplifier,” Int. Conf. Optics & Photonics in Technology Frontier, ICO’04, Tokyo, Japan, 13-16 July, 2004.
M. Najafi, V. Ahmadi, G. Abaeiyani, “Experimental Study of Spontaneous Emission in Double Heterostructure InGaAsP/InP,” Iran Physics Conf., 23-26 Aug. 2004.
M. Soroosh, V. Ahmadi, “ Calculation of Excess Noise in SAM-APD using MLP Neural Network,” 12th Iranian Conference on Electrical Engineering (ICEE 2004) Proc. Vol1, Mashhad, Iran, May 11-13, 2004 (in Persian).
E. Rahimian, V. Ahmadi, M. Noushiravani, “ Gain Analysis of GaAs-AlxGa1-xAs Quantum Well Lasers with and without Valence Band Mixing for Different Quantum Well Thickness and Depths” 7th Condensed Matter Conf. Iran Tech. and Science University, Tehran, Iran, 25-26 Jan. 2004.
K. Abedi, M. H. Sheikhi, S. Golmohammadi, V. Ahmadi, “ SPICE Model for Microwave Properties of Traveling-Wave Electro absorption Modulators,” IEEE International Conference on Semiconductor Electronics, ICSE2004, Kuala Lumpur, Malaysia, Dec. 7-9, 2004.
S. Golmohammadi, K. Abedi, V. Ahmadi, “Evanescent Optical Field Calculation with FDTD Method,” IEEE International Conference on Semiconductor Electronics, ICSE2004, Kuala Lumpur, Malaysia, Dec. 7-9, 2004.
M. H. Sheikhi, V. Ahmadi, M.K. Moravvej-Farshi, "Numerical Analysis for Characteristics of QW HPT/QW-LD Functional Optoelectronic Integrated Device,” 11th Iranian Conference on Electrical Engineering (ICEE 2003), Shiraz, 2003.
M. H. Sheikhi, V. Ahmadi, M.K. Moravvej-Farshi, T. Yao, "Fabrication and Characterization of a New Graded Structure GaAs/AlxGa1-xAs Metal-Semiconductor-Metal Photo detector,” Int1 Symposium on Telecom. (IST2003), August, Isfahan, Iran, 2003.
G. Abaiyani, V. Ahmadi,"Computation and Analysis of Threshold Current for CW-Operation of Stripe Laser Diode Considering the Thermal Resistance of the Laser,” Int1 Symposium on Telecom. (IST2003), August, Isfahan-Iran, 2003.
V. Ahmadi, F. Shahshahani, and E. Mortazy, "Analysis of RIN in DFB Semiconductor Laser Diodes Using Three Rate Equations Model,” Int1 Symposium on Telecom. (IST2003), Isfahan- Iran, August, 2003.
E. Mortazy, V. Ahmadi, M. K. Moravvej, and A. Zarifkar, "Mode Partition, Mode Hopping and Phase Noise in a Two-Mode Semiconductor Laser,” International Conf. on Advanced Optoelectronics & Lasers, Alushta, Ukraine, September, 2003.
E. Mortazy, F. Shahshahani, V. Ahmadi, A. H. Tehranchi, M. K. Moravvej, “The Effect of Spatial Hole Burning on Relative Intensity Noise in DFB Laser Diodes,” Australians Conf. on Optics, Lasers and Spectroscopy, ACOLS 03, the Univ. of Melbourne 1-4 Dec. 2003.
M. Razzaghi, V. Ahmadi, A. Zarifkar, “Numerical Method for Dynamic Gain Analysis in Semiconductor Laser Amplifier,” Australians Conf. on Optics, Lasers and Spectroscopy, ACOLS 03, the Univ. of Melbourne 1-4 Dec. 2003.
F. Shahshahani, V. Ahmadi, K. Mirabbaszadeh, "New Structure of QWS-DFB Laser Diode for Reduction of SHB Effect,” 10th Iranian Conference on Electrical Engineering (ICEE 2002), University of Tabriz, Tabriz,
E. Mortazy, V. Ahmadi, and M. K. Moravvej-Farshi, “Circuit Modeling and Measurement of Noise for a Semiconductor Laser Diode,” 10th Iranian Conference on Electrical Engineering (ICEE 2002), University of Tabriz, Tabriz, Iran, May 2002.
M. H. Sheikhi, V. Ahmadi, M. K. Moravvej, T. Yao," A physical Modeling for Transient Response of Voltage-Tunable Optoelectronic Integrated functional Device”, 6th International Workshop on Expert Evaluation & Control of Compound Semiconductor Materials & Technology 2002, Budapest-Hungary.
M. H. Sheikhi, V. Ahmadi, M.K. Moravvej-Farshi, "A Physical Model for Characteristics of PIN/QW-LD Optoelectronic Integrated Device," 2001 IEEE Canadian Conference on Electrical and Computer Engineering, Canada, May 2001.
V. Ahmadi, M. H. Sheikhi, M. K. Moravvej-Farshi, "A Physical Model for Characteristics of," 9th Iranian Conference on Electrical Engineering (ICEE 2001), Power and Water Institute of Technology, Tehran, Iran, May 2001.
M. Joodaki, G. Kompa, SMG Arshad, G Kamucha, V. Ahmadi, and M. K. Moravvej-Farshi, "Application of Neural Networks for Distance Measurement in Pulsed Laser Radar (PLR)," 3rd Topical Meeting on Optoelectronic Distance Displacement Measurement an Application (ODIMAP III), University of Pavia, Italy, Sept.2001.
M. Joodaki, G. Kompa, SMG Arshad, G Kamucha, V. Ahmadi, and M. K. Moravvej-Farshi, "Neural Method for Near Distance Measurements with Overlapping of Reference and Reflected Pulses in Pulsed Laser Radar, "1st Conf Exhibit. On Microwaves, Radio Communication and Electromagnetic Compatibility, Messe Stuttgart, Germany, 8-10 May 2001.
K. Bayat, M. K. Moravvej-Farshi, V. Ahmadi, M. Zolfaghari, and M. F. Baroughi, "Design and Analysis of a Broadband Wavelength Polarization Independent Ti: LiNbO3 Directional Coupler," ST2001, Tehran, Iran, September 2001.
M. Joodaki, G. Kompa, SMG. Arshad, V. Ahmadi, M. K. Moravvej, “Neural Method for 2D High Contrast Imaging in PLR,” Proc. Of 31st European Microwave Conf., London, England, 2001.
A. Zarifkar, V. Ahmadi, and M. K. Moravvej-Farshi, “Analysis of Intensity Noise in Two-Mode Semiconductor Laser Diodes,” 10th Iranian Conference on Electrical Engineering (ICEE 2001), 2001.
A. Banoushi, V. Ahmadi, “Modeling and Analysis for the Operation and Characteristics of a PIN Avalanche Photodiode,” 8th Conf. on Elect. Eng., Iran, Electronics Proceedings, 2000 (Persian).
M. H. Sheikhi, V. Ahmadi, “Analysis for Static and Dynamic Operation of a Quantum Well Optoelectronic Integrated Device with HPT/QW-LD Structure,” 8th Conf. on Elect. Eng., Iran, Electronics Proceedings, 2000 (Persian).
M. K. Moravvej, A. Zarifkar, V. Ahmadi, “Analysis of the Noise Intensity in Single Mode Laser Diode,” 8th Conf. on Elect. Eng., Iran, Electronics Proceedings, 2000 (Persian).
F. Shahshahani, V. Ahmadi, et al, “Analysis of the Line Width in DFB Laser Diode,” Iran Annual Physics Conf., Iran, Abstracts, 2000 (Persian).
F. Emami, V. Ahmadi, and M. K. Moravvej-Farshi, "Effects of Coupling Coefficient Variations on Threshold Parameters of DFB Laser,” The 8th Iranian Conf. on Elect. Eng., 2000.
M. K. Moravvej-Farshi, F. Emami, V. Ahmadi, " Coupling Coefficients for TE and TM modes for Coherent Fields in a Corrugated Five - Layer Waveguide,” The 8th Iranian Conf. on Elect. Eng., 2000.
V. Ahmadi, M. H. Sheikhi, M. K. Moravvej-Farshi, " Numerical Analysis for Static and Dynamic Characteristics of an Optical Amplifier - Switch Integrated Device. ,” International Conf. on Nanostructure Materials (Nano 2000), Japan, August 2000.
V. Ahmadi, M. H. Sheikhi, M. K. Moravvej-Farshi, " Analysis of Optical Gain and Rise-time of a QW-Structure Optoelectronic Integrated Device, 8th IEEE International Sym. on Electron Devices for Microwave and Optoelectronic Applications, DMO 2000, Scotland, 13-14 Nov. 2000.
V. Ahmadi, M. H. Sheikhi, M. K. Moravvej-Farshi, " Numerical Analysis for the Static and Dynamic Responses of an HPT/QW-LD Optoelectronic Integrated Device, the 12th International Conf. on Microelectronics, ICM 2000, Tehran, 2000.
H. S. Abedi, V. Ahmadi, et al, “Simulation of Index Guided Semiconductor Laser,” 7th Conf. on Elect. Eng., Iran, Electronics Proceedings, 1999 (Persian).
M. H. Sheikhi, V. Ahmadi, M. K. Morravej-Farshi," Optimum design of a Gain Switch Vertical Cavity Surface emitting Semiconductor Laser”, 7th Iranian Conference on Electrical Engineering 1999, Tehran-Iran. (in Persian).
V. Ahmadi, Quantum Optoelectronic Devices,” 1st Meeting of Optical Communication Devices Technology,” ITRC, Tehran, Iran, 1999 (in Persian).
N. Hatefi, V. Ahmadi, et al, “Simulation of Index Guided Semiconductor Laser,” 7th Conf. on Elect. Eng., Iran, Electronics Proceedings, 1999 (Persian).
F. Shahshahani, V. Ahmadi, et al, “Analysis for the Effects of Grating Structure on the Output Characteristics of DFB LD,” 1st Conf. on Applications of Physics and Nuclear Science in Medicine, Iran, Proceedings, 1999 (Persian).
A. Banoushi, V. Ahmadi, et al, “Analysis of a PIN-APD Characteristics,” 1st Conf. on Applications of Physics and Nuclear Science in Medicine, Iran, Proceedings, 1999 (Persian).
V. Ahmadi, M. H. Sheikhi, "Numerical Analysis for Characteristics of a QW Structure Optoelectronic Integrated Device,” Proc. of IEEE Int. On Semiconductor for Electronics, ICSE98, 1998. DOI:10.1109/SMELEC.1998.781149
M. Oskoei, V. Ahmadi, “Optical Output Characteristics of a GaAs Laser Diode,” 5th Meeting of Optic Professionals,” 1998 (in Persian).
G. Abaiani, V. Ahmadi, et al, “Fabrication and Analysis of 1.3 µm Heterojunction LED and LD,” 6th Conf. on Elect. Eng., Iran, Electronics Proceedings, 1998 (Persian).
M. H. Sheikhi, V. Ahmadi, “Optimum Design of VCSEL for Very Short Optical Pulses,” 6th Conf. on Elect. Eng., Iran, Electronics Proceedings, 1998 (Persian).
V. Ahmadi, "Computational Analysis of an Optical Amplifier Switch Integrated by HPT/LD,” Proc. 5th Iranian Conf. on Elect Eng. Electronics, 1997.
M. H. Sheikhi, V. Ahmadi, et al, “Modeling and Analysis of Dynamic Operation of an Integrated Optoelectronic Integrated Device Composed of HPT/LD,” 5th Conf. on Elect. Eng., Iran, Electronics Proceedings, 1997, (Persian).
M. Mohammadi, V. Ahmadi, “Fabrication and Characterization of a GaAs Solar Cell,” 4th Conf. on Condensed Matter, Iran, Proceedings, 1997 (Persian).
V. Ahmadi, M. H. Sheikhi, "Numerical Analysis for the Dynamic Response of an HPT/LD Optoelectronic Integrated Device,” Proc. 5th International Symp. On Advanced Material PP. 639-644, 1997.
V. Ahmadi, S. Noda, and A. Sasaki, "Fabrication and Analysis of an Optoelectronic Gate with Flip-Flop Function,” Iranian Annual Physics Conf., Abstract 289, 1996.
V. Ahmadi, S. Noda, and A. Sasaki, "Noise Characteristics of an Optoelectronic Integrated Light Amplifier,” Proc. 14th Iranian Conf. on Elect. Eng., Electronics, 52, 1996.
V. Ahmadi, S. Noda, and A. Sasaki, "Two-Dimensional Simulation and New Structures of Heterojunction Phototransistor for OEIDs ,” Topical Meeting of Int. Commission for Optics, 4p-31, 1994.
V. Ahmadi, S. Noda, and A. Sasaki, "Modeling and Analysis for Current-Voltage Characteristics of Integrated Devices of HPT and LD,” the Japan Society of Applied Physics (JSAP), the 41st Spring Meeting, a-G-2, 1994.
V. Ahmadi, S. Noda, and A. Sasaki, "Relative Intensity Noise (RIN) Analysis of OEID (II): Effect of Internal Feedback on RIN Characteristics,” the Japan Society of Applied Physics (JSAP), the 41st Spring Meeting, a-G-3, 1994.
V. Ahmadi, S. Noda, and A. Sasaki, "Simulation of OEIDs (I): Analysis and Optimum Design of HPT by 2-D Simulation,” the Japan Society of Applied Physics (JSAP), the 54th Autumn Meeting, P-E-10, 1993.
V. Ahmadi, S. Noda, and A. Sasaki, "Design of Very Sensitive HPT for OEIDs by 2-D Simulation,” Tech. Report IEICE, ED93-131, CPM 93-102, PP. 67-70, 1993.
S. Noda, K. Shibata, V. Ahmadi, and A. Sasaki, "Functional Photonic Switching Device by Vertical and Direct Integration of Six HPTs and Two LDs,” OSA Proc. on Photonic in Switching, Vol. 16, USA, 1993.
V. Ahmadi, S. Noda, and A. Sasaki, "Two-Dimensional Static Simulation of HPT/LD Optoelectronic Integrated Device,” Japan Optics 92, paO2, 1992