Task 4.3
2R Regeneration with QD-SOA
R. Bonk, T. Vallaitis, J. Wang, W. Freude,
Leuthold
University of Karlsruhe
Institute of High-Frequency and Quantum Electronics
J.
2R Regeneration: First approach
Amplitude Noise Compression
Principle of `1´-level noise
compression due to gain
saturation
• Sugawara showed single
wavelength ‘1’-level noise
compression around 1.5 µm.
• Q-factor improvement at 40
Gbit/s by 0.5 -1 at OSNR(in) =
23 dB / P(in)=3 dBm.
• Improvement in sensitivity by
4 dB to regenerate error-free
signals at a BER of 10-9
(OSNR(in) = 23dB).
Sugawara M. et al: J. Phys. D: Appl.
Phys. 38 (2005) 2126-2134
University of Karlsruhe
 Institute of High-Frequency and Quantum Electronics
2
Transfer Function
Pin= -15 dBm
Pin= -10 dBm
4
Pin= -5 dBm
10
2
Pin= 0 dBm
0
0
Gain (max) 5 dB
20
6
-10
-2
-20
-4
-6
-30
-8
-40
ASE spectrum [dBm]
Net Gain [dB]
I = 100 mA
Noise Figure 6-8
1300 nm
1290 nm
2
0
-10
Wavelength [nm]
-4
-6
0.7 dB improvement
-8
-10
Nearly linear transfer function
-12
Amplitude noise compression
possible ?
-16
University of Karlsruhe
2 dB improvement
-2
P out [dBm]
-50
-12
1270 1280 1290 1300 1310 1320 1330 1340 1350
I = 100 mA
DO 520 / 03 b
-14
-18
5 dB
5 dB
-16
-14
-12
-10
-8
-6
-4
-2
Pin [dBm]
 Institute of High-Frequency and Quantum Electronics
3
0
2
“10 Gbit/s” Single Wavelength- Test
Pin around -5 dBm
10 Gbit/s NRZ-Back-to
Back Signal at 1300nm
with SRBS of 231nnnn
Filter at the
receiver side
was missing
Pin around -1 dBm
University of Karlsruhe
 Institute of High-Frequency and Quantum Electronics
4
Outlook
“Calculation” for the multi-wavelength amplitude regeneration
measurement possibility : Discussion with TUB for device
improvement for the regeneration challenge
40 Gbit/s test at 1300 nm (filter needed)
Pump-Probe Results (measurements in progress)
University of Karlsruhe
 Institute of High-Frequency and Quantum Electronics
5