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Your search keyword '"Ashrafi, Reza"' showing total 5 results
Start Over Author "Ashrafi, Reza" Topic optical fibers
5 results on '"Ashrafi, Reza"'

1. RF-Arbitrary Waveform Generation Based on Microwave Photonic Filtering.

Author

Adams, Rhys, Ashrafi, Reza, Junjia Wang, Dizaji, Mohammad Rezagholipour, and Chen, Lawrence R.

Abstract

We demonstrate RF arbitrary waveform generation based on microwave photonic filtering. We use four-wave mixing in a silicon nanowire to increase the number of taps in an N-tap microwave photonic filter (MPF). Using a programmable optical filter, we can control the tap weights and, hence, the MPF response and corresponding generated waveform. We show uniform and apodized waveforms with four taps and seven taps with tunable central frequencies. [ABSTRACT FROM PUBLISHER]

Published
2014
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2. Single-shot photonic time-intensity integration with high processing speed over nanosecond time windows.

Author

Malacarne, Antonio, Ashrafi, Reza, Li, Ming, LaRochelle, Sophie, Yao, Jianping, and Azana, Jose

Abstract

We demonstrate photonic temporal intensity integration based on incoherent optical signal processing, with 36.8GHz processing bandwidth and 1.24ns integration time window. Single-shot operation is achieved using a frequency comb incoherent laser source. [ABSTRACT FROM PUBLISHER]

Published
2012

3. Ultrashort flat-top pulse generation using an integrated Mach-Zehnder interferometers.

Author

Li, Ming, Dumais, Patrick, Ashrafi, Reza, Bazargani, Hamed Pishvai, Quelene, Jean-Baptiste, Callender, Claire, and Azana, Jose

Abstract

Re-shaping of an ultrashort Gaussian-like-pulse into a flat-top pulse is demonstrated using an integrated Mach-Zehnder interferometer (MZI). 7.8-ps Gaussian-like-pulses are reshaped into nearly chirp-free 17.1-ps and 20.0-ps flat-top-pulses based on two different linear filtering schemes. [ABSTRACT FROM PUBLISHER]

Published
2012
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4. Arbitrary-order photonic differentiators based on phase-shifted long-period gratings.

Author

Ashrafi, Reza and Azana, Jose

Abstract

A novel design of THz-bandwidth all-optical arbitrary-order differentiators based on phase-shifted long period fiber/waveguide gratings is proposed and numerically demonstrated. This solution offers a dramatically increased tolerance against practical variations in the grating parameters (e.g. coupling strength). [ABSTRACT FROM PUBLISHER]

Published
2012
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