Figure captions Fig. 1. Full scheme of the microwave frequency transfer; SAW: Surface Acoustic Wave oscillator;
PLL: phase-locked loop; OC: optical circulator; EDFA : Erbium Doped Fiber Amplifier; EAM
DFB LD : Electro Absorption Modulator Distributed Feedback Laser Diode, YIG Yttrium Iron
Garnet microwave oscillator.
Fig. 2. Phase noise spectral density measured at 9.25 GHz of the compensated link (red trace), the
system noise with an optical attenuator to shorten the link (black dotted trace) and the laser diode
and photodiode noise (blue dashed line).
Fig. 3. Temporal behaviour of the propagation delay of the free-running optical link (smooth black
trace, one data point every 100s) and the end-to-end phase of the compensated link (sampled every
100s, light grey trace).
Fig. 4. Fractional frequency stability of (a) the free running 86-km link (black diamonds), (b) 1 GHz
compensation system [11] (blue squares), and (c) the compensated link at 9.15 GHz (red circles,
15 Hz measurement frequency bandwidth).
Fig.5. Fractional frequency instability of the 86-km link, in various configurations to highlight the
different limitations of the system: without dispersion compensation fiber (blue triangles), forward
polarization scrambling only (black squares), compensated 86-km link (red circles), system noise
floor with an optical attenuation to shorten the link (grey diamonds).
10
Figure 1
Figure 2
10
0
10
1
10
2
10
3
-130
-120
-110
-100
-90
S
φ
(f )
[d
B
ra
d
2
/H
z]
@
9
.2
5
G
H
z
f [Hz]
100 MHz VCXO loop filter