afbr-820bz Avago Technologies, afbr-820bz Datasheet - Page 7

• Manufacturer Part Number: afbr-820bz
• Description: Twelve-channel Transmitter And Receiver Pluggable, Parallel-fiber-optic Modules
• Manufacturer: Avago Technologies

Informative TX parameters trading off each other while
guaranteeing TP2 & TP4 performance
Informative RX parameters trading off each other while
guaranteeing TP4 performance
Figure 7. Reference and Test Channels for Transmitter
Figure 8. Reference and Test Channels for Receiver
7
Parameter
Extinction Ratio
Output Optical Modulation Amplitude
Output Rise/Fall Time
Relative Intensity Noise OMA
Contributed Portion of Accumulated
Deterministic Jitter
Contributed Portion of Accumulated
Total Jitter
Parameter
Receiver Bandwidth (BW)
Input Optical Power Sensitivity (OMA)
Contributed Portion of Accumulated
Deterministic Jitter
Contributed Portion of Accumulated
Total Jitter
Generator
Generator
Generator
Generator
Pattern
Pattern
Pattern
Pattern
TP1
TJ r
DJ r
TP1
TJ t
DJ t
TP1
TJ r
DJ r
TP1
TJ t
DJ t
Worst Case Transmitter
Min OMA
Min Center Wavelength
Max Spectral RMS Width
Max RIN
Max Rise & Fall Times
Transmitter Under Test Test Cable Plant
Worst Case Transmitter
Min OMA
Min Center Wavelength
Max Spectral RMS Width
Max RIN
Max Rise & Fall Times
Transmitter Under Test Test Cable Plant
Test OMA
Test Center Wavelength
Test Spectral RMS Width
Test RIN
Test Rise & Fall Times
Reference Channel for Rx DUT (Tx Test Channel)
12
12
12
OMA
OMA
OMA
Worst Case Cable Plant
Fiber Type
Max Length
Max Connector Loss
Max Modal Noise Penalty
Test Fiber Type
Test Length
Attenuator
Worst Case Cable Plant
Fiber Type
Max Length
Max Connector Loss
Max Modal Noise Penalty
Test Fiber Type
Test Length
Attenuator
Reference Channel for Tx DUT (Tx Test Channel)
Reference Channel
Reference Channel
Symbol
ER
OMA
RIN
Symbol
12
OMA
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. Differences
in the TP1 input jitter between the defined conditions, TJ
r and DJ r, for the reference channel and actually provided
in the test channel, TJ t and DJ t, can also be accommodat-
ed 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.
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.
Worst Case Receiver
Max Sensitivity
Min Bandwidth
Test Receiver
Test Sensitivity
Test Bandwidth
Worst Case Receiver
Max Sensitivity
Min Bandwidth
Receiver Under Test
TP4
TJ r
TP4
TJ t
TP4
TJ r
TP4
TJ t
BERT
BERT
BERT
BERT