AFCT-57J5APZ Avago Technologies US Inc., AFCT-57J5APZ Datasheet - Page 12

• Manufacturer Part Number: AFCT-57J5APZ
• Description: SM BTS FP SFP Ind-Temp, RoHS
• Manufacturer: Avago Technologies US Inc.

Specifications of AFCT-57J5APZ

• Data Rate: 3.072Gbps
• Wavelength: 1310nm
• Applications: General Purpose
• Voltage - Supply: 2.97 V ~ 3.63 V
• Connector Type: LC Duplex
• Mounting Type: SFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 10. Transceiver Digital Diagnostic Monitor (Real Time Sense) Characteristics
(T
Temperature is measured on the AFCT-57J5APZ using
sensing circuitry mounted on the internal PCB. The
measured temperature will generally be cooler than laser
junction and warmer than SFP case and can be indirect-
ly correlated to SFP case or laser junction temperature
using thermal resistance and capacitance modeling. This
measurement can be used to observe drifts in thermal
operating point or to detect extreme temperature fluctu-
ations such as a failure in the system thermal control. For
more information on correlating internal temperature to
case or laser junction contact Avago Technologies.
Supply voltage is measured on the AFCT-57J5APZ using
sensing circuitry mounted on the internal PCB. Transmit
supply voltage (VccT) is monitored for this readback. The
resultant value can be indirectly correlated to SFP VccT
or VccR pin supply voltages using resistance modeling,
but not with the required accuracy of SFF-8472. Supply
voltage as measured will be generally lower than SFP Vcc
pins due to use of internal transient suppression circuitry.
As such, measured values can be used to observe drifts in
supply voltage operating point, be empirically correlated
to SFP pins in a given host application or used to detect
supply voltage fluctuations due to failure or fault in the
system power supply environment. For more information
on correlating internal supply voltage to SFP pins contact
Avago Technologies.
Laser bias current is measured using sensing circuitry
located on the transmitter laser driver IC. Normal varia-
tions in laser bias current are expected to accommo-
date the impact of changing transceiver temperature
and supply voltage operating points. The AFCT-57J5APZ
uses a closed loop laser bias feedback circuit to maintain
constant optical power. This circuit compensates for
normal FABRY PEROT parametric variations in quantum
efficiency, forward voltage and lasing threshold due
to changing transceiver operating points. Consistent
increases in laser bias current observed at equilibrium
12
Parameter
Transceiver Internal
Temperature Accuracy
Transceiver Internal
Supply Voltage Accuracy
Transmitter Laser DC
Bias Current Accuracy
Transmitted Average Optical
Output Power Accuracy
Received Average Optical
Input Power Accuracy
C
= -40°C to 85°C, VccT, VccR = 3.3V r 10%)
Symbol
T
V
I
P
P
INT
INT
INT
T
R
Min
r 3.0
r 0.1
r 10
r 3.0
r 3.0
Units
°C
V
%
dB
dB
Notes
Temperature is measured internal to the transceiver.
Valid from = -40°C to 85 °C case temperature.
Supply voltage is measured internal to the transceiver and can,
with less accuracy, be correlated to voltage at the SFP Vcc pin. Valid
over 3.3 V r 10%.
IINT is better than r 10% of the nominal value.
Coupled into single-mode fiber. Valid from 100 uW to 500 uW, avg.
Coupled from single-mode fiber. Valid from 15 uW to 500 uW, avg.
temperature and supply voltage could be an indication
of laser degradation. For more information on using laser
bias current for predicting laser lifetime, contact Avago
Technologies.
Transmitted average optical power is measured using
sensing circuitry located on the transmitter laser driver
IC and laser optical subassembly. Variations in average
optical power are not expected under normal operation
because the AFCT-57J5APZ uses a closed loop laser bias
feedback circuit to maintain constant optical power. This
circuit compensates for normal FABRY PEROT parametric
variations due to changing transceiver operating points.
Only under extreme laser bias conditions will significant
drifting in transmitted average optical power be observ-
able. Therefore it is recommended Tx average optical
power be used for fault isolation, rather than predictive
failure purposes.
Received average optical power is measured using
detecting circuitry located on the receiver preamp and
quantizer ICs. Accuracy is +/- 3.0 dB, but typical accuracy
is +/- 2.0 dB. This measurement can be used to observe
magnitude and drifts in incoming optical signal level for
detecting cable plant or remote transmitter problems.