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Published on: January 28, 2019
Self-referenced temporal phase reconstruction from intensity measurements using causality arguments in linear optical
Mohammad H Asghari1, José Azaña
1Institut National de la Recherche Scientifique-Energie, Matériaux et Télécommunications (INRS-EMT), Montréal, Québec, Canada. asghari@emt.inrs.ca
Researchers developed a method to directly reconstruct optical signal phase profiles using only intensity measurements before and after a linear optical filter. This technique leverages filter linearity and causality for accurate phase recovery.
Area of Science:
- Optics and Photonics
- Signal Processing
Background:
- Characterizing optical signals is crucial for many applications.
- Direct temporal phase reconstruction from intensity measurements remains a challenge.
Purpose of the Study:
- To introduce a simple and general concept for direct temporal phase reconstruction.
- To demonstrate the concept numerically.
Main Methods:
- Utilizing the linearity and causality properties of arbitrary linear optical filters.
- Performing temporal intensity measurements at the input and output of the filter.
Main Results:
- Successfully demonstrated direct reconstruction of temporal phase profiles.
- Showcased the method's generality for arbitrary linear filters.
- Identified minimal restrictions on filter response for unambiguous reconstruction.
Conclusions:
- The proposed concept offers a straightforward approach to temporal phase recovery.
- The method is robust and adaptable, with potential for noise minimization through filter design.
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