Mr. Muhammad Assad Arshad Profile

Muhammad Assad Arshad

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Publications (6)

Proceedings Article | 20 June 2024 Presentation + Paper

Investigating nonlinear unidirectional operation in a fiber ring laser

Alexander Hartung, Muhammad Assad Arshad, Matthias Jäger

Proceedings Volume 13003, 1300306 (2024) https://doi.org/10.1117/12.3022361

KEYWORDS: Ring lasers, Fiber lasers, Optical filters, Raman scattering, Output couplers, Switching

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Proceedings Article | 13 May 2024 Presentation

Induction and control of directionality in reciprocal fiber ring laser by simple fiber end face reflections

Muhammad Assad Arshad, Alexander Hartung, Matthias Jäger

Proceedings Volume PC12865, PC1286505 (2024) https://doi.org/10.1117/12.3005266

KEYWORDS: Fiber lasers, Signal attenuation, Reflection, Ring lasers, Wave propagation, Wavelength division multiplexing, Raman spectroscopy, Laser damage threshold, Raman scattering, Output couplers

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Proceedings Article | 5 March 2021 Presentation

Unidirectional lasing using loss management in a reciprocal fiber ring laser

Muhammad Arshad, Arni Pratiwi, Alexander Hartung, Matthias Jäger

Proceedings Volume 11665, 116651O (2021) https://doi.org/10.1117/12.2582086

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Proceedings Article | 17 May 2018 Paper

Raman-based cw supercontinuum generation in a fiber ring laser with low-output coupling

Muhammad Assad Arshad, Alexander Hartung, Mikaёl Leduc, Nicolas Godbout, Hartmut Bartelt, Matthias Jäger

Proceedings Volume 10683, 106833F (2018) https://doi.org/10.1117/12.2311626

KEYWORDS: Diodes, Fiber lasers, Supercontinuum generation, Wave propagation, Continuous wave operation, Dispersion, Raman scattering, Signal attenuation, Semiconductor lasers, Feedback signals

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Proceedings Article | 26 June 2017 Paper

A method for fast laser beam spot focus using electrically tunable lenses

Muhammad Assad Arshad, Muhammad Ahsan, Syed Azer Reza

Proceedings Volume 10335, 103351W (2017) https://doi.org/10.1117/12.2270114

KEYWORDS: Gaussian beams, Lenses, Optical imaging, Imaging systems, Sensors, Optical calibration, Microscopy, Sensing systems, Ranging, Microscopes, Charge-coupled devices, Photonics, Image sensors, Laser beam propagation, Optical sensing

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Proceedings Article | 27 April 2016 Paper

Data transfer through beam steering using agile lensing

Muhammad Assad Arshad, Syed Azer Reza, Ahsan Muhammad

Proceedings Volume 9889, 988929 (2016) https://doi.org/10.1117/12.2231910

KEYWORDS: Modulation, Data communications, Beam steering, Gaussian beams, Free space optical communications, Photons, Cameras, Modeling, Standards development, Gaussian optics, Gaussian pulse, Laser sources, Lenses, Binary data, Free space optics

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This paper presents a data transfer scheme using multi-focus tunable lenses. The design involves the use of a standard laser source and a variable focus agile lens to steer to the laser beam that passes through the lens. In our proposed system, the beam steer angle depends on an input electrical signal which drives the tunable lens. Therefore the beam steer angle is made to follow the variations in the input electrical drive signal. This is extremely interesting for data transfer applications as the data signal can be used as the input drive signal to the lens. The laser beam is steered according to the input data voltage levels and when the beam is incident on a photo-detector of a finite size, only a fraction of its total incident optical power is received by the photo-detector. This power contribution is proportional to the fraction of the total number of photons per unit area which are incident on the active area of the detector. The remaining photons which are not incident on the photo-detector do not contribute to the received power at the photo-detector. We present the theory of beam steering through a tunable lens and present a theoretical framework which governs data transfer through the proposed method. We also present the transfer function of the proposed system which helps us to calculate its essential theoretical performance parameters such as modulation depth and bit error rates. We also present experimental results to demonstrate efficient data transfer through the proposed method. As tunable lenses are primarily deployed in motion-free multi-focus cameras hence most of the modern portable devices such as cellphones and tablets use these lenses to operate the in-built variable focus cameras that are part of these devices. Because tunable lenses are commonly present in several different portable devices, the proposed method of data transfer between two devices is highly promising as it expands the use of the already deployed tunable lenses with minimal changes to the fundamental architecture or operation of any portable device.

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