Fig. 7.40 (a) Theoretical functions of PSD of the phase noise of OEO S(Δν L /ν 0L ) ¼ S out with the
PLL system versus the width Δν ¼ Δν L of the laser spectral line at different parameters of the
system calculated according to Eq. (7.78), ν 0L is the average frequency of the laser generation. (b)
PSD of the phase noise in OEO with the PLL system. Curves 1 “PD” and 2 “A” correspond to
minimum possible phase noise of the photodetector and the RF amplifier. The curve 4 “LD”
corresponds to detected PSD of the phase noise of the laser diode, and the curve 3 “OEO”
corresponds to PSD of the phase noise of OEO without PLL, while the curve 5 “OEO PLL”—
with PLL
460
7 Optoelectronic oscillator (OEO) as the Time and Spatial Correlator of Random. . .
PLL system versus the width Δν ¼ Δν L of the laser spectral line at different parameters of the
system calculated according to Eq. (7.78), ν 0L is the average frequency of the laser generation. (b)
PSD of the phase noise in OEO with the PLL system. Curves 1 “PD” and 2 “A” correspond to
minimum possible phase noise of the photodetector and the RF amplifier. The curve 4 “LD”
corresponds to detected PSD of the phase noise of the laser diode, and the curve 3 “OEO”
corresponds to PSD of the phase noise of OEO without PLL, while the curve 5 “OEO PLL”—
with PLL
460
7 Optoelectronic oscillator (OEO) as the Time and Spatial Correlator of Random. . .