new plots for Diss. Mostly AI gen. Few changes in actual codebase

Functions/frequency_wavelength/calcWavelengthPlan.m

@@ -0,0 +1,24 @@
+function channelplan_nm = calcWavelengthPlan(N, df_hz, center_nm)
+
+vec = [N:-1:1]-(N/2+0.5);
+
+channelplan_hz = nm2hz(center_nm) + (vec * df_hz) ;
+
+channelplan_nm = hz2nm(channelplan_hz);
+
+%  dfft = 1.367053998632946e+07; %hz
+%  a = diff(channelplan_hz)./2./dfft;
+
+end
+
+function hz = nm2hz(nm)
+    wavelen_in_m = nm.* 1e-9; 
+    hz =  (299792458 ./ wavelen_in_m); %frequency in Terahertz
+end
+
+function nm = hz2nm(hz)
+    m =  (299792458 ./ hz); %wavelength in meter
+    nm = m .* 10^9;
+end
+
+