AFBR-732BE HP [Agilent(Hewlett-Packard)], AFBR-732BE Datasheet - Page 2

• Manufacturer Part Number: AFBR-732BE
• Description: Ultra Short Link Pluggable Parallel Fiber Optic Modules, Transmitter and Receiver
• Manufacturer: HP [Agilent(Hewlett-Packard)]

Design Summary:
Design for low-cost, high-volume
manufacturing
Agilent’s parallel optics solution
combines twelve 2.5 Gb/s
channels into discrete
transmitter and receiver
modules providing a maximum
aggregate data rate of 30 Gb/s.
Moreover, these modules
employ a heat sink for thermal
management when used on
high-density cards, have
excellent EMI performance, and
interface with the industry
standard MTP®/MPO connector
systems. They provide the most
cost-effective high- density (Gb/
s per inch) solutions for high-
data capacity applications. See
Figure 1 for the transmitter
and Figure 2 for the receiver
block diagrams.
The AFBR-732B transmitter
and the AFBR-742B receiver
modules provide very closely
spaced, high-speed parallel
data channels. Within these
modules there will be some
level of cross talk between
channels. The cross talk within
the modules will be exhibited
as additional data jitter or
sensitivity reduction compared
to single-channel performance.
Agilent Technologies’ jitter and
sensitivity specifications include
cross talk penalties and thus
represent real, achievable
module performance.
2
Functional Description, Transmitter
Section
The transmitter section, Figure
1, uses a 12-channel 850 nm
VCSEL array as the optical
source and a diffractive optical
lens array to launch the beam
of light into the fiber. The
package and connector system
are designed to allow
repeatable coupling into
standard 12-fiber ribbon cable.
In addition, this module has
been designed to be compliant
with IEC 60825 Class 1M eye
safety requirements.
The optical output is controlled
by a custom IC, which provides
proper laser drive parameters
and monitors drive current to
ensure eye safety. An EEPROM
and state machine are
programmed to provide both ac
and dc current drive to the
laser to ensure correct
modulation, eye diagram over
variations of temperature and
power supply voltages.
Functional Description, Receiver
Section
The receiver section, Figure 2,
contains a 12-channel AlGaAs/
GaAs photodetector array,
transimpedance preamplifier,
filter, gain stages to amplify
and buffer the signal, and a
quantizer to shape the signal.
The Signal Detect function is
designed to sense the proper
optical output signal on each of
the 12 channels. If loss of
signal is detected on an
individual channel, that
channel output is squelched.
Packaging
The flexible electronic
subassembly was designed to
allow high-volume assembly
and test of the VCSEL, PIN
photo diode and supporting
electronics prior to final
assembly.
Regulatory Compliance
The overall equipment design
into which the parallel optics
module is mounted will
determine the certification level.
The module performance is
offered as a figure of merit to
assist the designer in
considering their use in the
equipment design.
Organization Recognition
See the Regulatory Compliance
Table for a listing of the
standards, standards
associations and testing
laboratories applicable to this
product.
Electrostatic Discharge (ESD)
There are two design cases in
which immunity to ESD damage
is important.
The first case is during
handling of the module prior to
mounting it on the circuit
board. It is important to use
normal ESD handling
precautions for ESD sensitive
devices. These precautions
include using grounded wrist
straps, work benches, and floor
mats in ESD controlled areas.
The second case to consider is
static discharges to the exterior
of the equipment chassis
containing the module parts. To
the extent that the MTP®
(MPO) connector receptacle is
exposed to the outside of the
equipment chassis it may be
subject to system level ESD test
criteria that the equipment is
intended to meet.
See the Regulatory Compliance
Table for further details.