05 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure
100GBASE-LR4/ER4/SR4 Optical Stressed Eye Test
Challenges
The IEEE 802.3 standard, clauses 88.7, 95.7 describe the optical specifications for
100GBASE-LR4, -ER4 and -SR4 optical receivers. The following table contains the salient
conditions required for stressed receiver sensitivity test.
Parameter description
100GBASE-LR4
–6.8 dBm
4 dB
100GBASE-ER4
–17.9 dBm
8 dB
100GBASE-SR4
–5.2 dBm
2 dB
Stressed receiver sensitivity (OMA), lane under test (max)
Extinction ratio (with jitter and interferers off)
Conditions of stressed receiver sensitivity test
Vertical eye closure penalty (VECP), lane under test
Stressed eye closure (SEC), lane under test
Stressed eye J2 jitter, lane under test
1.8 dB
3.5 dB
-
-
-
4.3 dB
0.3 UI
0.3 UI
0.39 UI
Stressed eye J4 jitter, lane under test
-
0.47 UI
-
-
0.47 UI
-
0.53 UI
Stressed eye J9 jitter, lane under test
-
Stressed receiver eye mask definition {X1,X2,X3,Y1,Y2,Y3}
Hit ratio 5E-5 hits per sample
{0.28,0.5,0.5,0.33,0.33,0.4}
Setting up a stressed eye according to the standard can be a very time consuming task, even
for experienced users it can take a half day. The reason is that the stressed eye parameters
are interdependent and therefore several iterations of the optimization cycle are required
to converge on the solution. In addition, it is important that the setup is repeatable and
remains stable from the time of the stressed eye calibration through to the end of the DUT
measurement. Otherwise a drift in the test setup, especially in the electro-optical converter will
impair the test results.
The N4917B optical receiver stress test solution provides a repeatable and stable measurement
in a fraction of time compared to manual setup of the stressed eye. This offers major time
saving during daily measurements and speeds up developing a standard compliant test solution
when compared to a self made solution.
KEYSIGHT [ Keysight Technologies ]
