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Published on: August 17, 2011
Fiber coupling efficiency for random light and its applications to lidar.
1Institut für Nachrichtentechnik und Hochfrequenztechnik, Technische Universität Wien, Gusshausstrasse 25/389, A-1040 Vienna, Austria.
Optics Letters
|December 19, 2007
Summary
We derived a formula for efficiently coupling random light into optical fibers using lenses. For Gaussian light sources, optimal coupling geometry and lens size maximize efficiency, reaching 42% for fiber-based lidar.
Area of Science:
- Classical coherence theory
- Optical physics
- Fiber optics
Background:
- Efficient light coupling is crucial for optical systems.
- Classical coherence theory provides a framework for understanding light propagation.
- Optical fibers are essential for modern communication and sensing.
Purpose of the Study:
- To derive a general expression for light coupling efficiency into optical fibers.
- To analyze the factors influencing coupling efficiency for Gaussian light sources.
- To determine the maximum achievable coupling efficiency for fiber-based lidar applications.
Main Methods:
- Application of the van Cittert-Zernike theorem.
- Derivation of a general coupling efficiency expression.
- Analysis of coupling efficiency dependence on geometric parameters and source characteristics.
Main Results:
- A general formula for quasi-monochromatic random light coupling efficiency was derived.
- Coupling efficiency for Gaussian sources depends on lens-to-fiber geometry and lens size to speckle size ratio.
- A maximum coupling efficiency of approximately 42% was found for monostatic fiber-based lidar systems.
Conclusions:
- The study provides a theoretical basis for optimizing light coupling into optical fibers.
- Understanding the interplay between source properties and optical geometry is key to maximizing efficiency.
- The findings have direct implications for the performance of fiber-based lidar systems.
