Laboratory experiment OF 9.2 GHz frequency transfer with a fiber

We report the preliminary laboratory experiments on a 9.2 GHz frequency signal transfer through a 10 km commercial 1550 nm fiber spool in NIM. Theory analysis shows that increasing modulation frequency can significantly enhance the detecting sensitivity of fiber noise, as well as the sensitivity of compensating the noise. Because of the phase shift induced by fiber dispersion between the two first sidebands of EO (electro-optical) modulated optical carrier, beat signal between them, which can not be detected without phase shift, can be used as transferred signal with double modulation frequency. With actively canceling the noise induced by fiber, we have obtained a stability of about 8E-16/1000s up to now only with slow loop servo actuating by MDL (Motor Drove Delay Line).