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<p>Applies drive signal to laser. </p>
<p>There is some flexibility in how drive signals are specified. The following are acceptable:</p>
<ol type="1">
<li>A single <a class="el" href="classsignal__interface.html" title="Signal description class. ">signal_interface</a> with multiple complex baseband columns</li>
<li>Several <a class="el" href="classsignal__interface.html" title="Signal description class. ">signal_interface</a> objs with o