690
23 Electricity-to-Light Conversion
(a)
(b)
0.5
1.0
1.5
2.0
0
0.0
0.5
1.0
1.5
mW
mW
mW
mW
mW
0.0
0.6
2.5
4.3
8.9
Fig. 23.76 a Schematic geometry of tapered semiconductor amplifier. b Optical output power versus amplifier current
for various values of the optical input power, taper angle was 5 ◦ . For zero input power only spontaneous and amplified
spontaneous emission is observed. Reprinted with permission from [2041]
Fig. 23.77 Photographs of a MOPA arrangement of a laser (master oscillator, ‘MO’), glass lens and tapered amplifier
(power amplifier, ‘PA’) on a silicon micro-optical ‘bench’. Reprinted with permission from [2042]
currents up to 2 A by AR facet coating of 10
−4 in a 70 nm band. The wall-plug efficiency of the discussed
amplifier is up to over 40%. If such an amplifier is arranged together with a seed laser diode (master
oscillator), the setup is called MOPA (master oscillator power amplifier), as shown in Fig. 23.77. A
modulated input also leads to a modulated output.
Quantum dot arrays can be a useful gain medium in a SOA [2043, 2044] due to their fast gain
dynamics [2045] and broad spectrum (Sect. 23.3.6).
23 Electricity-to-Light Conversion
(a)
(b)
0.5
1.0
1.5
2.0
0
0.0
0.5
1.0
1.5
mW
mW
mW
mW
mW
0.0
0.6
2.5
4.3
8.9
Fig. 23.76 a Schematic geometry of tapered semiconductor amplifier. b Optical output power versus amplifier current
for various values of the optical input power, taper angle was 5 ◦ . For zero input power only spontaneous and amplified
spontaneous emission is observed. Reprinted with permission from [2041]
Fig. 23.77 Photographs of a MOPA arrangement of a laser (master oscillator, ‘MO’), glass lens and tapered amplifier
(power amplifier, ‘PA’) on a silicon micro-optical ‘bench’. Reprinted with permission from [2042]
currents up to 2 A by AR facet coating of 10
−4 in a 70 nm band. The wall-plug efficiency of the discussed
amplifier is up to over 40%. If such an amplifier is arranged together with a seed laser diode (master
oscillator), the setup is called MOPA (master oscillator power amplifier), as shown in Fig. 23.77. A
modulated input also leads to a modulated output.
Quantum dot arrays can be a useful gain medium in a SOA [2043, 2044] due to their fast gain
dynamics [2045] and broad spectrum (Sect. 23.3.6).