 description class ">signal_interface</a> parameters (Fs,Rs)</li>
<li>Traverseable: Gets the signal parameters as an input</li>
</ol>
<p>Two types of operation</p><ol type="1">
<li>lorentzian: You need to specifiy linewidth. It creates a flat frequency power spectral density (PSD) at linewidth/pi level, which corresponds to a lorenztian optical spectrum with a FWHM of linewidth.</li>
<li>semiconductor: You need to specify LFLW1GHZ, HFLW, fr, K and alpha. It creates the desired semiconductor frequency noise 