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