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Part No. HFBR-772BHWZ
Description  Pluggable Parallel Fiber Optic Modules, Transmitter and Receiver Low cost per Gb/s
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Homepage  http://www.avagotech.com


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Design Summary:
Design for low-cost, high-volume manufacturing
Avago’s parallel optics solution combines twelve 2.7 Gbd
channels into discrete transmitter and receiver modules
providing a maximum aggregate data rate of 32 Gb/s.
Moreover, these modules employ a heat sink for thermal
management when used on high-density cards, have ex-
cellent EMI performance, and interface with the industry
standard MTP®/MPO connector systems. They provide the
most cost-effective high- density (Gbd per inch) solutions
for high-data capacity applications. See Figure 1 for the
transmitter and Figure 2 for the receiver block diagrams.
The HFBR-772BWZ transmitter and the HFBR-782BZ re-
ceiver 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. Avago Technologies’ jitter and sensitivity
specifications include cross talk penalties and thus rep-
resent real, achievable module performance.
Functional Description, Transmitter Section
The transmitter section, Figure 1, uses a 12-channel 850
nm VCSEL array as the optical source and a diffractive op-
tical 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 compli-
ant with IEC 60825 Class 1 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 cur-
rent drive to the laser to ensure correct modulation, eye
diagram and extinction ratio over variations of tempera-
ture 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.
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
Regulatory Compliance
The overall equipment design into which the parallel
optics module is mounted will determine the certifica-
tion 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 de-
vices. These precautions include using grounded wrist
straps, work benches, and floor mats in ESD controlled
The second case to consider is static discharges to the
exterior of the equipment chassis containing the mod-
ule 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.

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