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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Focusing and scanning light through a multimode optical fiber using digital phase conjugation.
Ioannis N Papadopoulos1, Salma Farahi, Christophe Moser
1Laboratory of Optics, School of Engineering, École Polytechnique Fédéral de Lausanne (EPFL), Lausanne Switzerland. ioannis.papadopoulos@epfl.ch
Optics Express
|May 9, 2012
Summary
We achieved a sharp focus at the end of a multimode optical fiber using digital phase conjugation. This technique allows for precise control and scanning of the focal point, overcoming fiber imperfections.
Area of Science:
- * Optics and Photonics
- * Digital Signal Processing
Background:
- * Multimode optical fibers typically scatter light, preventing a sharp focus at their output.
- * Achieving a controlled focal point in multimode fibers is crucial for applications like optical imaging and communication.
Purpose of the Study:
- * To demonstrate a digital phase conjugation technique for creating a sharp focus at the end of a multimode optical fiber.
- * To experimentally validate the technique's performance and explore its capabilities for focal point manipulation.
Main Methods:
- * Implementation of a digital phase conjugation algorithm.
- * Experimental setup utilizing a 105 μm core multimode fiber.
- * Characterization of the focal spot quality and scanning capabilities.
Main Results:
- * Achieved a sharp focal point at the fiber tip with a high contrast of 1800.
- * Demonstrated digital scanning of the focal point.
- * Analyzed the impact of illumination conditions and fiber bending on focus quality.
Conclusions:
- * Digital phase conjugation is a viable method for achieving a sharp focus in multimode optical fibers.
- * The technique offers precise control over the focal point, enabling scanning and potentially compensating for fiber aberrations.
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