HFCT-711XPD Avago Technologies US Inc., HFCT-711XPD Datasheet - Page 10

• Manufacturer Part Number: HFCT-711XPD
• Description: TXRX SMF XFP 10BGE 2KM OC-192
• Manufacturer: Avago Technologies US Inc.

Specifications of HFCT-711XPD

• Data Rate: 10.52Gbps
• Wavelength: 1310nm
• Applications: General Purpose
• Voltage - Supply: 3.135 V ~ 3.465 V
• Connector Type: LC Duplex
• Mounting Type: Panel Mount
• Function: Transceiver for Multirate SONET OC-192 SR1, 10G Base-LR and 10G FC
• Product: Transceiver
• Maximum Rise Time: 24 ps
• Maximum Fall Time: 24 ps
• Operating Supply Voltage: 3.135 V to 3.465 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: - 5 C
• Package / Case: XFP-30
• For Use With: Singlemode Glass
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Transceiver Internal Temperature
Temperature is measured on the HFCT-711XPD using
sensing circuitry mounted on the internal PCB. The
measured temperature will generally be cooler than laser
junction and warmer than XFP case and can be indirectly
correlated to XFP 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
fluctuations such as a failure in the system thermal control.
For more information on correlating internal temperature
to case or laser junction contact Avago Technologies.
Transmitter Laser dc Bias Current
Laser bias current is measured using sensing circuitry
located on the transmitter laser driver IC. Normal
variations in laser bias current are expected to
accommodate the impact of changing transceiver
temperature and supply voltage operating points. The
HFCT-711XPD uses a closed loop laser bias feedback
circuit to maintain constant optical power and extinction
ratio. This circuit compensates for normal laser parametric
variations in quantum efficiency, forward voltage and
lasing threshold due to changing transceiver operating
points.
Figure 5. XFP Assembly Drawing
10
Cage Assembly
Heat Sink
Clip
Module
Host Board
Bezel
Transmitted Average Optical Output Power
Variations in average optical power are not expected
under normal operation because the HFCT-711XPD uses
a closed loop laser bias feedback circuit to maintain
constant optical power. This circuit compensates for
normal laser parametric variations due to changing
transceiver operating points. Only under extreme laser
bias conditions will significant drifting in transmitted
average optical power be observable. Therefore it is
recommended Tx average optical power be used for fault
isolation, rather than predictive failure purposes.
Received Average Optical Input Power
Received average optical power measurements are a
valuable asset for installers to verify cable plant
compliance. Drifts in average power can be observed
from the cable plant and remote transmitter for potential
predictive failure use. Received average optical power
can be used for fault isolation.
Auxilliary Monitors
In addition to the parameters mentioned above, Laser
Temperature and Supply Voltage are also reported as
auxilliary parameters
EMI Gasket
(not shown)
Connector