HFBR-779BZ/BEZ/BHZ and HFBR-789BZ/BEZ/BHZ
Pluggable Parallel Fiber Optic Modules, Transmitter and Receiver
Data Sheet
Description
The HFBR-779BZ transmitter and HFBR-789BZ
receiver are high performance fiber optic modules
for parallel optical data communication
applications. These 12-channel devices, operating
up to 2.7 Gbd per channel, provide a cost
effective solution for short-reach applications
requiring up to 32 Gb/s aggregate bandwidth.
These modules are designed to operate on
multimode fiber systems at a nominal wavelength
of 850 nm. They incorporate high performance,
highly reliable, short wavelength optical devices
coupled with proven circuit technology to provide
long life and consistent service.
The HFBR-779BZ transmitter module incorporates
a 1 2 - channel VCSEL (Vertical Cavity Surface
Emitting Laser) array together with a custom
12-channel laser driver integrated circuit
providing IEC-60825 and CDRH Class 1M laser
eye safety.
The HFBR-789BZ receiver module contains a
12-channel PIN photodiode array coupled with
a custom preamplifier / post amplifier integrated
circuit.
Operating from a single +3.3 V power supply,
both modules provide LVTTL or LVCMOS control
interfaces and Current Mode Logic (CML)
compatible data interfaces to simplify external
circuitry.
The transmitter and receiver devices are housed
in MTP®/MPO receptacled packages. Electrical
connections to the devices are achieved by
means of a pluggable 10 x 10 connector array.
Features
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RoHS Compliant
Low cost per Gb/s
High package density per Gb/s
3.3 volt power supply for low power consumption
850 nm VCSEL array source
12 independent channels per module
Separate transmitter and receiver modules
2.7 Gbd data rate per channel
Standard MTP® (MPO) ribbon fiber connector
interface
Pluggable package
62.5/125 micron multimode fiber operation:
Distance up to 100 m with 160 MHz.km fiber at 2.5 Gbd
Distance up to 200 m with 400 MHz.km fiber at 2.5 Gbd
Data I/O is CML compatible
Control I/O is LVTTL compatible
Manufactured in an ISO 9002 certified facility
Applications
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Datacom switch and router backplane connections
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Telecom switch and router backplane connections
Ordering Information
The HFBR-779BZ and HFBR-789BZ products
are available for production orders through the
Avago Technologies Component Field Sales office.
HFBR-779BZ No EMI Nose Shield
HFBR-789BZ No EMI Nose Shield
HFBR-779BEZ With Extended EMI Nose Shield
HFBR-789BEZ With Extended EMI Nose Shield
HFBR-779BHZ No EMI Nose Shield, No Heatsink
HFBR-789BHZ No EMI Nose Shield, No Heatsink
Design Summary:
Design for low-cost, high-volume manufacturing
Avago Technologies’ 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 excellent 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-779BZ transmitter and the HFBR-
789BZ receiver modules provide very closely
spaced, highspeed 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 represent 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 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
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 current drive to the laser to
ensure correct modulation, eye diagram and
extinction ratio 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,
transimpedence 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® (MTO) 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.
2
COMPARATOR
SHUT
DOWN
AMPLIFIER
12
DIN+
INPUT
STAGE
LEVEL
SHIFTER
12
DRIVER
D/A
CONVERTER
DIN-
12
VCSEL ARRAY
SERIAL
CONTROL
I/O*
4
CONTROLLER
D/A
CONVERTER
TEMPERATURE
DETECTION
CIRCUIT
Figure 1. Transmitter block diagram.
* TX_EN, TX_DIS, RESET-, FAULT-
OFFSET
CONTROL
DATA OUT
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
LIMITING
AMPLIFIER
OUTPUT
BUFFER
DATA OUT
SIGNAL
DETECT
CIRCUIT
SD
Figure 2. Receiver block diagram (each channel).
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Electromagnetic Interference (EMI)
Many equipment designs using these high-data-
rate modules will be required to meet the
requirements of the FCC in the United States,
CENELEC in Europe and VCCI in Japan. These
modules, with their shielded design, perform to
the levels detailed in the Regulatory Compliance
Table. The performance detailed in the Regulatory
Compliance Table is intended to assist the
equipment designer in the management of the
overall equipment EMI performance. However,
system margins are dependent on the customer
board and chassis design.
Immunity
Equipment using these modules will be subject
to radio frequency electromagnetic fields in
some environments. These modules have good
immunity due to their shielded designs. See the
Regulatory Compliance Table for further detail.
Eye Safety
These 850 nm VCSEL-based modules provide
eye safety by design. The HFBR-779BZ has
been registered with CDRH and certified by
TUV as a Class 1M device under Amendment 2
of IEC 60825-1. See the Regulatory Compliance
Table for further detail. If Class 1M exposure is
possible, a safety-warning label should be placed
on the product stating the following:
LASER RADIATION
DO NOT VIEW DIRECTLY WITH OPTICAL
INSTRUMENTS
CLASS 1M LASER PRODUCT
Connector Cleaning
The optical connector used is the MTP® (MPO).
The optical ports have recessed optics that are
visible through the nose of the ports. The
provided port plug should be installed any time
a fiber cable is not connected. The port plug
ensures the optics remain clean and no cleaning
should be necessary. In the event the optics
become contaminated, forced nitrogen or clean
dry air at less than 20 psi is the recommended
cleaning agent. The optical port features,
including guide pins, preclude use of any solid
instrument. Liquids are not advised due to
potential damage.
Process Plug
Each parallel optics module is supplied with an
inserted process plug for protection of the
optical ports within the MTP® (MTO) connector
receptacle.
Handling Precautions
The HFBR-779BZ and HFBR-789BZ can be
damaged by current surges and over-voltage
conditions. Power supply transient precautions
should be taken.
Normal handling precautions for electrostatic
sensitive devices should be taken (see ESD
section).
The HFBR-779BZ is a Class 1M laser product.
DO NOT VIEW RADIATION DIRECTLY WITH
OPTICAL INSTRUMENTS.
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Absolute Maximum Ratings
[1,2]
Parameter
Storage Temperature (non-operating)
Case Temperature (operating)
Supply Voltage
Data/Control Signal Input Voltage
Transmitter Differential Data Input Voltage
Output Current (dc)
Relative Humidity (non-condensing)
Symbol
T
S
T
C
V
CC
V
I
|V
D
|
I
D
RH
Min.
–40
Max.
100
90
Unit
°C
°C
V
V
V
mA
%
Reference
1
1, 2, 4
1, 2
1
1, 3
1
1
–0.5
–0.5
4.6
V
CC
+ 0.5
2
25
5
95
Notes:
1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. See Reliability Data Sheet for specific reliability
performance.
2. Between Absolute Maximum Ratings and the Recommended Operating Conditions functional performance is not intended, device reliability is not
implied, and damage to the device may occur over an extended period of time.
3. This is the maximum voltage that can be applied across the Transmitter Differential Data Inputs without damaging the input circuit.
4. Case Temperature is measured as indicated in Figure 3.
Recommended Operating Conditions
[1]
Parameter
Case Temperature
Supply Voltage
Signaling Rate per Channel
Data Input Differential Peak-to-Peak
Voltage Swing
Control Input Voltage High
Control Input Voltage Low
Power Supply Noise for
Transmitter and Receiver
Transmitter/Receiver Data
I/O Coupling Capacitors
Receiver Differential Data Output Load
Symbol
T
C
V
CC
Min.
0
3.135
1
Typ.
40
3.3
Max.
80
3.465
2.72
1400
Unit
°C
V
Gbd
mV
P-P
V
V
mV
P-P
µF
W
Reference
2, Figs. 3, 4
Figs. 5, 6, 12
3
4, Figs. 7, 8
DV
DINP-P
175
V
IH
V
IL
N
P
C
AC
R
DL
2.0
V
EE
V
CC
0.8
200
5, Figs. 5, 6
0.1
Fig. 7
100
Fig. 7
Notes:
1. Recommended Operating Conditions are those values outside of which functional performance is not intended, device reliability is not implied, and
damage to the device may occur over an extended period of time. See Reliability Data Sheet for specific reliability performance.
2. Case Temperature is measured as indicated in Figure 3. A 55°C, 1 m/s, parallel to the printed circuit board, air flow at the module or equivalent
cooling is required. See Figure 4.
3. The receiver has a lower cut off frequency near 100 kHz.
4. Data inputs are CML compatible. Coupling capacitors are required to block DC.
∆V
DINP-P
=
∆V
DINH
–
∆V
DINL
, where
∆V
DINH
= High State Differential
Data Input Voltage and
∆V
DINL
= Low State Differential Data Input Voltage.
5. Power Supply Noise is defined for the supply, VCC, over the frequency range from 500 Hz to 2500 MHz, with the recommended power supply filter
in place, at the supply side of the recommended filter. See Figures 5 and 6 for recommended power supply filters.
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