Laser
FODL
MZ
CH1
OF
OA
E(t)
P p
CH2
OF
FO
PD
C
10
1)
2)
3)
4)
OF
OF
A 1
A 2
8
6
4
2
v 0 – 2f 0 v 0 – f 0
v 0 + f 0 v 0 + 2f 0
v 0
v 0 – 2f 0 v 0 – f 0
v 0 + f 0 v 0 + 2f 0
v 0
v 0 – 2f 0 v 0 – f 0
v 0 + f 0 v 0 + 2f 0
v 0
10
8
6
4
2
10
8
6
4
2
Optical frequency v
T 2M
T 1M
L
F
A
+
*
×
∫
Optical
Spectrum
S (v)
Optical
Spectrum
S (v)
Optical
Spectrum
S (v)
U(t)
F
A
(c)
(b)
(a)
f 0
2f 0 f
1.0
0.8
0.6
0.4
0
10
RF frequency
RF Spectrum
S( f )
20
Fig. 2.4 The functional diagram illustrating principles of the correlator method and the frequency
discriminator method in OEO with the MZ modulator and in the circuit with direct amplitude
modulation at suppression of the one harmonic. (a) Laser ¼ the optical quantum oscillator
(generator) (the laser or QWLD), MZ ¼ the electro-optical MZ modulator, OA ¼ the optical
amplifier, OF ¼ the optical filter, OF ¼ the optical fiber, P p ¼ the pumping power, PD ¼ the
32
2 Nanostructural Optoelectronic Oscillators with the Fiber-Optical Delay Line