OEO at different exceeds of the pumping current above the threshold value with
account of carrier noises.
We note that the laser phase noise (Fig. 7.34a) increases almost by the order with
the growth of exceeds of the pumping current above the threshold value by 3–7
times, which confirms the obtained theoretical results.
The calculated dependences (Eqs. 7.70 and 7.71) of phase and amplitude noises
in the closed oscillating system of OEO DM with QWLD are presented in Fig. 7.34b
versus the offset F in frequency from the subcarrier in the OEO single-frequency
mode in the coherent photodetection mode.
Figure 7.35 shows the calculated functions (Eqs. 7.70–7.73) of the OEO phase
noises versus offsets at different exceeds of the pumping current J/J 0 in the oscillating system of OEO with QWLD at DM in the single-frequency mode at coherent
photodetection.
Fig. 7.34 (continued) phase and amplitude noises in closed oscillating system of OEO DM with
QWLD versus the offset F in frequency from the subcarrier in the single-frequency OEO mode in
the coherent photodetection mode. The length of the optical fiber is 1000 m, the delay in time in OF
is 5 μs, the emission power at exceed of the pumping current above the threshold value J 0 /J 0thr ¼ 3
Fig. 7.35 Calculated functions (Eqs. 7.70–7.73) of phase noises of OEO at different exceeds of the
pumping current J/J 0 in OEO with QWLD at DM in the single-frequency mode at coherent
detection. The OF length is 1000 m, the delay is 5 μs, the emission power is 20 mW at the pumping
current exceed of 10 above the threshold value
448
7 Optoelectronic oscillator (OEO) as the Time and Spatial Correlator of Random. . .
account of carrier noises.
We note that the laser phase noise (Fig. 7.34a) increases almost by the order with
the growth of exceeds of the pumping current above the threshold value by 3–7
times, which confirms the obtained theoretical results.
The calculated dependences (Eqs. 7.70 and 7.71) of phase and amplitude noises
in the closed oscillating system of OEO DM with QWLD are presented in Fig. 7.34b
versus the offset F in frequency from the subcarrier in the OEO single-frequency
mode in the coherent photodetection mode.
Figure 7.35 shows the calculated functions (Eqs. 7.70–7.73) of the OEO phase
noises versus offsets at different exceeds of the pumping current J/J 0 in the oscillating system of OEO with QWLD at DM in the single-frequency mode at coherent
photodetection.
Fig. 7.34 (continued) phase and amplitude noises in closed oscillating system of OEO DM with
QWLD versus the offset F in frequency from the subcarrier in the single-frequency OEO mode in
the coherent photodetection mode. The length of the optical fiber is 1000 m, the delay in time in OF
is 5 μs, the emission power at exceed of the pumping current above the threshold value J 0 /J 0thr ¼ 3
Fig. 7.35 Calculated functions (Eqs. 7.70–7.73) of phase noises of OEO at different exceeds of the
pumping current J/J 0 in OEO with QWLD at DM in the single-frequency mode at coherent
detection. The OF length is 1000 m, the delay is 5 μs, the emission power is 20 mW at the pumping
current exceed of 10 above the threshold value
448
7 Optoelectronic oscillator (OEO) as the Time and Spatial Correlator of Random. . .