Power Coupling Efficiency Enhancement in Multimode Step-Index Fiber Using Refractive and Diffractive Microlenses

<table>Hybrid achromat (<svg height="10.6875" id="M111" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 43.037498 10.6875" width="43.037498" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.6875)">
<g transform="translate(72,-63.45)">
<text transform="matrix(1,0,0,-1,-71.95,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑀</tspan>
<tspan style="font-size: 12.50px; " x="16.028847" y="0">=</tspan>
<tspan style="font-size: 12.50px; " x="28.069235" y="0">1</tspan>
</text>
</g>
</g>
</svg>) number of diffractive segments versus focal length.</table>

International Journal of Optics

fig3

Figure 3

Figure 3: Power Coupling Efficiency Enhancement in Multimode Step-Index Fiber Using Refractive and Diffractive Microlenses 