The coupling efficiency depends upon the overlap integral of the Gaussian mode of the input laser beam and the nearly Gaussian fundamental mode of the fiber. Improving the coupling efficiency of two optical signals is a hot issue, where the efficiency of optical coupling has a significant effect on the signal transmission over the fiber link. To this end, the Large-Beam Fiber Coupler (LBFC) with a Double-combined Collimating Lens (DCL) and a single-mode. The physical optics propagation algorithm may be used to compute fiber coupling efficiency. A ray based method is also supported, for details search the help files for "Fiber Coupling Efficiency". Where F r (x, y) is the function describing the receiving fiber complex amplitude, W (x, y) is the. Calculate fiber coupling efficiency with mode mismatch, lateral offset, and angular misalignment losses. Computes optimal focal length for beam-to-fiber coupling. In practical laser diode systems, this value is rarely 100%.
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