Dr. Ahmad K. Atieh Profile

Dr. Ahmad K. Atieh

VP, Optical Systems at Optiwave Systems Inc

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Author

Publications (27)

Proceedings Article | 12 March 2024 Poster + Paper

A free space optical link model for C-band data and power transmission

Idriss Amadou Ali, D. Paige Wilson, Meghan Beattie, Ryan Hogan, Narmada Rajaram, Ross Cheriton, Ahmad Atieh, Karin Hinzer

Proceedings Volume 12877, 128771Q (2024) https://doi.org/10.1117/12.3001939

KEYWORDS: Free space optics, Modulation, Data modeling, Data transmission, Telecommunications, Atmospheric modeling, Signal attenuation, Systems modeling, Optical transmission, Fiber optic gyroscopes

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The emerging technology of power-by-light enables power and data delivery over a single Free Space Optical (FSO) link for electrically isolated, interference-free remote operation. Telecom wavelength bands (λ ≈ 1550 nm) are well known for applications in data communication over optical fiber and overlap atmospheric transparency windows, extending the reach of FSO power and data systems through the air. This creates the opportunity to directionally deliver significant power (above 1mW) and high speed data wirelessly over long distances. FSO channels can experience turbulence and weather conditions that affect data and power transmission. Hence, they should be modeled and verified against measurements under varied atmospheric conditions. This will help improve model precision and robustness in predicting FSO channel performance. Accurate modeling of data transmission in FSO channels is urgently required to support the design of wireless optical communication systems for remote areas to which fiber deployment is difficult or uneconomic and instead long-range data communications between ground stations and High-Altitude Platform Systems (HAPS) may be employed. We have modelled an FSO channel transmitting data and power at 1550 and 1520 nm respectively under various meteorological conditions. The system model was developed in the commercially available OptiSystem software for modeling signals transmission. Different weather conditions translate directly to different FSO channel signal attenuations, impacting both data and power transmission. We also explore the impact of different modulation schemes such as Quadratic Amplitude Modulation (QAM), Pulse Amplitude Modulation (PAM), and Quadratic Phase Shift Keying (QPSK) on the bit error rate of the transmitted data thereby achieving the optimal required hardware design parameters. We found that QPSK is predicted to have the longest viable FSO range across all weather conditions and that power cannot be transmitted past 1 km in foggy weather.

Proceedings Article | 28 June 2023 Open Access

Optical communication system (OptiSystem) software enabling remote education and teaching

Ahmad Atieh, Mihail Raytchev

Proceedings Volume 12723, 1272304 (2023) https://doi.org/10.1117/12.2664849

KEYWORDS: Optical communications, Telecommunications, Design and modelling, Equipment, Photodetectors, Virtual reality, Universities, Online learning, Control systems

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Proceedings Article | 31 May 2023 Presentation + Paper

Silicon-based surface gratings for efficient fiber-chip and free-space beam coupling

Daniel Benedikovic, William Fraser, Radovan Korcek, Xiaochen Xin, Yousef Karimi Yonjali, Carlos Alonso-Ramos, Laurent Vivien, Pavel Cheben, Jens Schmid, Maziyar Milanizadeh, Tom Smy, Ahmad Atieh, Winnie Ye

Proceedings Volume 12575, 1257507 (2023) https://doi.org/10.1117/12.2665440

KEYWORDS: Silicon nitride, Silicon, Optical gratings, Waveguides, Phased array optics, Silicon photonics, Photonic metamaterials, Optical antennas, Integrated photonics, Antennas

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Silicon photonics has established itself as a key integration platform, leveraging high-quality materials and large-scale manufacturing using mastered toolsets of complementary metal-oxide-semiconductor (CMOS) foundries. Chip-scale photonics offer unique promises for dense integration of versatile optical functions through compact and high-performance building blocks. Integrated photonics is now competing technology for many applications, spanning from telecom/datacom and interconnects up to quantum sciences and light detection and ranging (LIDAR) systems, among others. However, the lack of low-loss input/output chip interfaces can be prohibitive to successfully deploy multi-diverse device applications. Low coupling loss is essential in reducing overall power budget in photonic systems, impacting on-chip integration level. The light coupling from an off-chip environment into the planar waveguide platforms has always been a challenging research problem since the early years of integrated photonics. Optical interfaces formed on a photonic chip surface, rather than implemented on a chip edge, have been widely used to access photonic circuits with optical fibers or enabling free-space coupling of light beams. Surface gratings can be positioned at arbitrary locations and/or arranged in pre-defined patterns on the chip, facilitating wafer-scale testing and optical packaging. In this work, we present our recent progress in the development of silicon-based surface gratings for use in fiber-to-chip and free-space beam coupling. In particular, we discuss prospective design approaches to develop low-loss surface grating couplers implemented on silicon-on-insulator (SOI), silicon nitride (SiN), and hybrid silicon-silicon nitride (Si-SiN) platforms, allowing to approach a coupling loss below -1 dB. Among these, we also cover contemporary advances in compact silicon metamaterial nano-antennas for dense optical phased arrays, obtaining high a diffraction performance (> 90%) and wideband operation (> 200 nm) simultaneously.

Proceedings Article | 17 March 2023 Presentation

Integrated silicon photonic optical phased arrays with large beam steering and high resolution

Winnie Ye, Daniel Benedikovic, Qiankun Liu, Shahrzad Khajavi, Daniele Melati, Alejandro Sánchez Postigo, Jens Schmid, Dan-Xia Xu, Xiaochen Xin, Pavel Cheben, Tom Smy, Ahmad Atieh

Proceedings Volume PC12425, PC124250G (2023) https://doi.org/10.1117/12.2650465

KEYWORDS: Beam steering, Phased array optics, Silicon photonics, LIDAR, Silicon, Optical components, Chemical elements, Unmanned vehicles, Solid state physics, Satellite communications

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Proceedings Article | 15 March 2023 Presentation + Paper

Investigating probabilistic constellation shaping for dual-polarization PAM8 signals at different data rates

Ahmed Galib Reza, Marcos Troncoso Costas, Liam Barry, Ahmad Atieh, Kayden L. Kaller, Mihail Raytchev

Proceedings Volume 12429, 124291E (2023) https://doi.org/10.1117/12.2648047

KEYWORDS: Digital signal processing, Polarization, Modulation, Eye, Signal detection, Single mode fibers, Numerical simulations, Signal processing, Quadrature amplitude modulation, Data transmission

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SPIE Journal Paper | 31 March 2021

Self restorable intra data center interconnect based on multimode fiber and free-space optics

Jawad Mirza, Aadil Raza, Ahmad Atieh, Saeed Iqbal, Salman Ghafoor

OE, Vol. 60, Issue 03, 036113, (March 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.3.036113

KEYWORDS: Free space optics, Receivers, Data centers, Multimode fibers, Modulation, Forward error correction, Vertical cavity surface emitting lasers, Digital signal processing, Multiplexing, Signal processing

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SPIE Journal Paper | 20 November 2020

Investigation of 340-Gbps terrestrial FSO link incorporating spectral-efficient DP-QPSK-PolSK hybrid modulation scheme

Mehtab Singh, Jyoteesh Malhotra, Ahmad Atieh, Dhiman Kakati, Dhasarathan Vigneswaran

OE, Vol. 59, Issue 11, 116106, (November 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.11.116106

KEYWORDS: Free space optics, Modulation, Fiber optic gyroscopes, Air contamination, Signal attenuation, Atmospheric turbulence, Optical engineering, Receivers, Refractive index, Turbulence

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SPIE Journal Paper | 10 July 2020

Design and performance analysis of GPON-employed two-dimensional multidiagonal OCDMA code

Kehkashan Memon, Ahmad Atieh, A. Waheed Umrani, Mukhtiar Unar, Wajiha Shah

OE, Vol. 59, Issue 07, 076105, (July 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.7.076105

KEYWORDS: Single mode fibers, Optical engineering, Transmitters, Telecommunications, Receivers, Optical fibers, Fiber Bragg gratings, Continuous wave operation, Computer programming

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Proceedings Article | 4 March 2019 Paper

Broadband SOI grating coupler based on sub-wavelength gratings with low back reflection for fiber-to-chip coupling of DWDM signals

Neha Purwaha, Cem Bonfil, Sahar Sargheini, Ahmad Atieh, Winnie Ye

Proceedings Volume 10921, 1092129 (2019) https://doi.org/10.1117/12.2510384

KEYWORDS: Dense wavelength division multiplexing, Photonic integrated circuits, Resonators, Waveguides, Demultiplexers, Silicon, Fiber couplers, Telecommunications, Integrated optics, Diffraction gratings

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Proceedings Article | 14 May 2018 Presentation + Paper

Enhanced sensing and accessing capabilities of an FBG sensor using fiber loop mirror

Ahmad Atieh

Proceedings Volume 10654, 106540R (2018) https://doi.org/10.1117/12.2307857

KEYWORDS: Fiber Bragg gratings, Sensors, Mirrors, Phase shifts, Fiber optics sensors, Continuous wave operation, Geometrical optics, Light emitting diodes, Fiber couplers, Optical testing

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Proceedings Article | 10 December 2011 Paper

Investigating optimal regimes of operation for pluggable XFPs in multi-channels 10G systems exploiting nonlinear effects

Josh Kemp, Ahmad Atieh

Proceedings Volume 8309, 830908 (2011) https://doi.org/10.1117/12.903185

KEYWORDS: Dispersion, Modulation, Telecommunications, Scanning probe microscopy, Optical fibers, Complex systems, Optical communications, Transceivers, Dense wavelength division multiplexing, Optical amplifiers

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Proceedings Article | 29 November 2011 Paper

Novel multilayer structure CWDM demultiplexer in silica

Ahmad Atieh, Ibrahim Mansour, Zakariya Dalala

Proceedings Volume 8307, 830704 (2011) https://doi.org/10.1117/12.904043

KEYWORDS: Coarse wavelength division multiplexing, Demultiplexers, Refractive index, Silica, Interfaces, Multilayers, Dispersion, Dense wavelength division multiplexing, Mirrors, Reflection

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Proceedings Article | 23 September 2010 Paper

Investigating optimal regime of operation for 10G optical communication systems using pluggable XFPs

Philip Copping, Ahmad Atieh, Josh Kemp, Wahab Almuhtadi

Proceedings Volume 7750, 77500U (2010) https://doi.org/10.1117/12.872990

KEYWORDS: Telecommunications, Dispersion, Eye, Optical fibers, Optical communications, Scanning probe microscopy, Optical amplifiers, Modulation, Power meters, Receivers

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Proceedings Article | 5 August 2009 Paper

Investigating pluggable transceivers' laser linewidth, chirp, and stimulated Brillouin scattering effects on data transmission in different kinds of optical fibers

Ahmad Atieh, Serge Terekov, Josh Kemp, Rathy Shankar, Wahab Almuhtadi

Proceedings Volume 7386, 738629 (2009) https://doi.org/10.1117/12.839892

KEYWORDS: Optical fibers, Modulation, Laser scattering, Dispersion, Laser damage threshold, Fiber lasers, Scattering, Telecommunications, Data transmission, Transceivers

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Proceedings Article | 26 October 2007 Paper

Stability and linewidth of multiwavelength semiconductor fibre ring laser

Hazem Awad, Ahmad Atieh, Trevor Hall, Hasan Farahneh

Proceedings Volume 6796, 679612 (2007) https://doi.org/10.1117/12.778720

KEYWORDS: Semiconductor lasers, Semiconductors, Fiber lasers, Polarization, Laser stabilization, Single mode fibers, S band, Optical filtering, Tunable lasers, Indium nitride

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Proceedings Article | 21 September 2006 Paper

Investigating tunable FBG for reconfigurable optical add/drop multiplexer in metro-edge network applications

Ahmad Atieh

Proceedings Volume 6353, 635301 (2006) https://doi.org/10.1117/12.690287

KEYWORDS: Fiber Bragg gratings, Modulation, Multiplexers, Dense wavelength division multiplexing, Dispersion, Numerical simulations, Networks, Optical networks, Optical amplifiers, Telecommunications

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Proceedings Article | 8 September 2006 Paper

Tunable FBG for sub-banded reconfigurable optical add/drop multiplexer

Ahmad Atieh

Proceedings Volume 6343, 63431V (2006) https://doi.org/10.1117/12.707799

KEYWORDS: Fiber Bragg gratings, Modulation, Multiplexers, Numerical simulations, Dispersion, Dense wavelength division multiplexing, Telecommunications, Optical networks, Laser sources, Optical amplifiers

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Proceedings Article | 8 September 2006 Paper

Linewidth control in semiconductor optical amplifier based fibre ring lasers

Trevor Hall, Ahmad Atieh, Hazem Awad

Proceedings Volume 6343, 63430Q (2006) https://doi.org/10.1117/12.707694

KEYWORDS: Semiconductor lasers, Polarization, Fiber lasers, Semiconductors, S band, Semiconductor optical amplifiers, Fiber amplifiers, Optical isolators, Homodyne detection, Laser stabilization

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Proceedings Article | 6 December 2005 Paper

More services, less fiber: the commercial and network architecture impact of a black-link approach to the sharing of optical fiber infrastructure for the deployment of triple play services

Robin Andrew, Ahmad Atieh, Pablo Perez, Fahim Sheikh

Proceedings Volume 6022, 60220C (2005) https://doi.org/10.1117/12.636872

KEYWORDS: Coarse wavelength division multiplexing, Dense wavelength division multiplexing, Receivers, Transmitters, Optical amplifiers, Optical fibers, Signal attenuation, Wavelength division multiplexing, Network architectures, Telecommunications

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Proceedings Article | 25 October 2005 Paper

Wavelength translations for optical network reach extension

Aneta Loukova, Paul Vella, Ahmad Atieh

Proceedings Volume 6012, 60120P (2005) https://doi.org/10.1117/12.629015

KEYWORDS: Transmitters, Signal attenuation, Receivers, Optical amplifiers, Dense wavelength division multiplexing, Coarse wavelength division multiplexing, Optical networks, Modulation, Signal detection, Optical fibers

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Proceedings Article | 13 October 2005 Paper

Wavelength translations for optical network upgrades

Paul Vella, Ahmad Atieh

Proceedings Volume 5970, 59701R (2005) https://doi.org/10.1117/12.626266

KEYWORDS: Dense wavelength division multiplexing, Transmitters, Receivers, Optical amplifiers, Signal attenuation, Coarse wavelength division multiplexing, Optical networks, Telecommunications, Optical fibers, Modulation

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Proceedings Article | 16 November 2004 Paper

ASE and cross-gain modulation limitations in a four-channel CWDM transmission system using an SOA

Ahmad Atieh, Paul Vella

Proceedings Volume 5579, (2004) https://doi.org/10.1117/12.566188

KEYWORDS: Coarse wavelength division multiplexing, Modulation, Composites, Signal to noise ratio, Data transmission, Semiconductor optical amplifiers, Optical amplifiers, Tunable filters, Telecommunications, Multiplexing

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Proceedings Article | 15 December 2003 Paper

Extremely flat ultrawideband supercontinuum for WDM/TDM applications

Chander Grover, Costel Flueraru, Ahmad Atieh

Proceedings Volume 5260, (2003) https://doi.org/10.1117/12.543177

KEYWORDS: Solitons, Dispersion, Fiber lasers, Polarization, Raman spectroscopy, Fiber amplifiers, Supercontinuum sources, Wavelength division multiplexing, Telecommunications, Picosecond phenomena

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Proceedings Article | 27 April 2001 Paper

WDM fiber laser sources

Ahmad Atieh

Proceedings Volume 4282, (2001) https://doi.org/10.1117/12.424779

KEYWORDS: Fiber Bragg gratings, Wavelength division multiplexing, Laser sources, Mirrors, Attenuators, Fiber couplers, Laser resonators, Optical filters, Fiber amplifiers, Polarization

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Proceedings Article | 15 December 2000 Paper

Noise figure reduction in erbium-doped fiber amplifiers using loop mirror filter

Ahmad Atieh

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406420

KEYWORDS: Optical amplifiers, Fiber amplifiers, Mirrors, Optical isolators, Optical filters, Interference (communication), Signal to noise ratio, Signal attenuation, Single mode fibers, Fiber couplers

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Proceedings Article | 13 April 2000 Paper

All-optical automatic gain control in loop erbium-doped fiber amplifiers

Ahmad Atieh

Proceedings Volume 3942, (2000) https://doi.org/10.1117/12.382862

KEYWORDS: Optical amplifiers, Fiber amplifiers, Fiber Bragg gratings, Automatic control, Signal generators, Wavelength division multiplexing, Fiber couplers, Attenuators, Optical filters, Electronic filtering

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Proceedings Article | 4 December 1998 Paper

Measuring Raman time constant (TR) for subpicosecond soliton pulses in standard single mode fiber

Jacek Chrostowski, Ahmad Atieh, Piotr Myslinski, P. Galko

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328632

KEYWORDS: Solitons, Raman spectroscopy, Optical amplifiers, Single mode fibers, Time metrology, Optical fibers, Picosecond phenomena, Wave propagation, Dispersion, Terahertz radiation

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Showing 5 of 27 publications

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