Many changes in DBHandler

new general processing structure
just before splitting off the projects folder from this repo

Functions/Theory/propagation_time.m

@@ -0,0 +1,11 @@
+function prop_time = propagation_time(fiber_len_m)
+
+    c = physconst('lightspeed');          % Speed of light in vacuum (m/s)
+    n = 1.46;         % Refractive index of the fiber
+    
+    % Calculate the propagation speed in the fiber
+    propagation_speed = c / n;
+    
+    % Calculate the propagation time
+    prop_time = fiber_len_m ./ propagation_speed;
+end