The reference model for testing transmitters consists
of a pattern generator, fiber optic test cable, attenuator,
test receiver and BERT. See Figure 7 for the evolution of
a reference channel to a transmitter test channel. Dif-
ferences between the worst case values for attributes in
the reference model and those in the test equipment set
can be compensated by an added attenuator (note that
the 10GbE model translates all impairments into power
penalties) and adjustments in TJ criteria at TP4. Differ-
ences in the TP1 input jitter between the defined condi-
tions, TJ r and DJ r, for the reference channel and actually
provided in the test channel, TJ t and DJ t, can also be
accommodated by adjustments to TP4 test criteria (TJ r
becomes TJ t). The extended 10GbE Link model is used to
determine the compensating attenuation and TP4 criteria
adjustments.
Informative TX parameters trading off each other while guar-
anteeing TP2 & TP4 performance
Parameter
Symbol
ER
Extinction Ratio
Output Optical Modulation Amplitude
Output Rise/Fall Time
OMA
Relative Intensity Noise OMA
Accumulated Deterministic Jitter
Accumulated Total Jitter
RIN12OMA
Informative RX parameters trading off each other while guar-
anteeing TP4 performance
Parameter
Symbol
Receiver Bandwidth (BW)
Input Optical Power Sensitivity (OMA)
The reference for testing receivers consists of a pattern
generator, test transmitter, fiber optic test cable, attenua-
tor and BERT. See Figure 8 for the evolution of a reference
channel to a receiver test channel. In a similar manner
as with the transmitter, all differences between the test
equipment and worst case channel are compensated with
an attenuator and adjustments in the TP4 criteria.
R e fe re n ce C h a n n e l
T P 1 W o rst C a se T ra n sm itte r
W o rst C a se C a b le P la n t
F ib e r T yp e
W o rst C a se R e ce ive r
M a x S e n sitivity
T P 4
T J
T J
r
M in O M A
r
P a tte rn
G e n e ra to r
B E R T
D J r M in C e n te r W a ve le n gth
M a x S p e ctra l R M S W id th
M a x R IN 1 2 O M A
M a x L e n gth
M a x C o n n e cto r L o ss
M a x M o d a l N o ise P e n a lty
M in B a n d w id th
M a x R ise & F a ll T im e s
R e fe re n ce C h a n n e l fo r T x D U T (T x T e st C h a n n e l)
T P 1 T ra n sm itte r U n d e r T e st
T e st C a b le P la n t
T e st F ib e r T yp e
T e st L e n gth
T e st R e ce ive r
T e st S e n sitivity
T e st B a n d w id th
T P 4
T J
t
T J
t
P a tte rn
G e n e ra to r
B E R T
D J t
A tte n u a to r
Figure 7. Reference and Test Channels for Transmitter
Reference Channel
TP1
Worst Case Transmitter
Min OMA
Worst Case Cable Plant
Fiber Type
Worst Case Receiver
Max Sensitivity
TJ
r
Pattern
Generator
BERT
DJ
r
Min Center Wavelength
Max Spectral RMS Width
Max RIN 12 OMA
Max Rise & Fall Times
Max Length
Max Connector Loss
Max Modal Noise Penalty
Min Bandwidth
Reference Channel for Rx DUT (Tx Test Channel)
TP1
Test Transmitter
Test OMA
Test Center Wavelength
Test Spectral RMS Width
Test RIN 12 OMA
Test Rise & Fall Times
Test Cable Plant
Test Fiber Type
Test Length
Receiver Under Test
TP4
TJ t
TJ
t
Pattern
Generator
BERT
DJ
t
Attenuator
Figure 8. Reference and Test Channels for Receiver
6
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