l assumption is that the fiber supports "principal modes" and that these have a bandwidth that is larger than the signal bandwidth. This is fine for SMF, but potentially problematic for multimode fiber.</li>
</ol>
<p><b>Examples</b></p>
<div class="fragment"><div class="line">param = <span class="keyword">struct</span>(<span class="charliteral">&#39;D&#39;</span>, 1e-6, <span class="charliteral">&#39;S&#39;</span>, .0092, <span class="charliteral">&#39;L&#39;</span>, 40, <span class="stringliteral">&#39;los