Attached figure is theoretical CCFC FDS curve with optimal detuning (54Hz). With the following parameters, frequency at which the anti squeezing crosses shot noise is 44Hz.

sqz_dB = 10.5;                    % produced SQZ (dB)

L_rt = 120e-6;                    % FC losses

L_inj = 0.35;                     % Injection losses

L_ro = 0.24;                      % Readout losses

A0 = 0.05;                         % Squeezed field/filter cavity mode mismatch

C0 = 0.05;                         % Squeezed field/local oscillator mode mismatch

ERR_L =   1e-12;                  % Lock accuracy (m)

ERR_csi = 30e-3;                  % Phase noise (rad)

phi_Hom = [0/180*pi, 30/180*pi, 60/180*pi ,90/180*pi]; % Homodyne angle (rad)

det = -54; % detuning [Hz]