afbr-79q4ekz Avago Technologies, afbr-79q4ekz Datasheet - Page 8

• Manufacturer Part Number: afbr-79q4ekz
• Description: 40 Gigabit Ethernet 40gbase-sr4 Qsfp+ Pluggable, Parallel Fiber-optics Module
• Manufacturer: Avago Technologies

Transmitter Optical Characteristics
The following characteristics are defined over the Recommended Operating Conditions unless otherwise noted. Typical
values are for Tc = 40°C, Vcc = 3.3 V
*
Figure 5. Transmitter eye mask definitions at Hit ratio 5 x 10
8
Parameter
Center wavelength
RMS spectral width
Average launch power, each lane
Optical Modulation Amplitude
(OMA) each lane
Difference in launch power
between any two lanes (OMA)
Peak power, each lane
Launch power in OMA minus TDP,
each lane
Transmitter and dispersion
penalty (TDP), each lane
Extinction ratio
Optical return loss tolerance
Encircled flux
Eye Mask coordinates:
Average launch power of OFF
transmitter, each lane
(From Table 86-6 of IEEE 802.3ba)
X1, X2, X3, Y1, Y2, Y3
1+Y3
See Figure 6 for Test Point definitions.
1-Y1
1-Y2
0.5
-Y3
Y2
Y1
1
0
0
X1
Normalized Time [UI]
X2
X3 1-X3
Test Point*
TP2
TP2
TP2
TP2
TP2
TP2
TP2
TP2
TP2
TP2
TP2
TP2
TP2
1-X2
1-X1
-5
hits per sample
0.23, 0.34, 0.43, 0.27, 0.35, 0.4
840
-7.6
-5.6
-6.5
Min
1.0
3
SPECIFICATION VALUES
≥ 86% at 19 μm,
≤ 30% at 4.5 μm
X1 = 0.23
X2 = 0.34
X3 = 0.43
Y1 = 0.27
Y2 = 0.35
Y3 = 0.40
850
Typ
0.65
-30
Max
860
2.4
3.5
12
3
4
4
Units
dBm
dBm
dBm
dBm
dBm
nm
nm
dB
dB
dB
dB
UI
Notes/Conditions
RMS Spectral Width is the stan-
dard deviation of the spectrum
Even if the TDP<1 dB, the OMA
minimum must exceed -5.6 dBm
If measured into type A1a.2
50 Pm fiber in accordance
with IEC 61280-1-4
Hit Ratio = 5x10
-5