HFBR-772B/BE/BH and HFBR-782B/BE/BH
Pluggable Parallel Fiber Optic Modules,
Transmitter and Receiver
Data Sheet
Description
The HFBR-772B transmitter and HFBR-782B 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 incorpo-
rate high performance, highly reliable, short wavelength
optical devices coupled with proven circuit technology to
provide long life and consistent service.
The HFBR-772B transmitter module incorporates a 12-
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-782B 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
•
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
•
50/125 micron multimode fiber operation:
Distance up to 300 m with
500 MHz.km fiber at 2.5 Gbd
Distance up to 600 m with
2000 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
•
Datacom switch and router backplane connections
•
Telecom switch and router backplane connections
•
InfiniBand connections
Patent -
www.avagotech.com/patents
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-772B transmitter and the HFBR-782B 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. Avago Technologies’ jitter and sensitivity
specifications include cross talk penalties and thus
represent real, achievable module performance.
Functional Description, Receiver Section
The receiver section, Figure 2, contains a 12-channel
AlGaAs/GaAs photodetector array, transimpedance pre-
amplifier, 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.
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 tem-
perature and power supply voltages.
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 recep-
tacle 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
DIN+
12
INPUT
STAGE
LEVEL
SHIFTER
12
D/A
CONVERTER
DRIVER
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
PIN
DOUT+
TRANS-IMPEDANCE
PRE-AMPLIFIER
LIMITING
AMPLIFIER
OUTPUT BUFFER
DOUT-
SIGNAL DETECT
CIRCUIT
SD
Figure 2. Receiver block diagram (each channel).
3
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.
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 con-
taminated, 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.
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.
Process Plug
Each parallel optics module is supplied with an inserted
process plug for protection of the optical ports within the
MTP® (MPO) connector receptacle.
Eye Safety
These 850 nm VCSEL-based modules provide eye safety by
design. The HFBR-772B 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
Handling Precautions
The HFBR-772B and HFBR-782B can be damaged by
current surges and overvoltage conditions. Power supply
transient precautions should be taken. Application of
wave soldering, reflow soldering and/or aqueous wash
processes with the parallel optic device on board is not
recommended as damage may occur.
Normal handling precautions for electrostatic sensitive
devices should be taken (see ESD section).
The HFBR-772B is a Class 1M laser product.
DO NOT VIEW RADIATION DIRECTLY WITH OPTICAL
INSTRUMENTS.
4
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
–0.5
–0.5
Max.
100
90
4.6
V
CC
+ 0.5
2
25
Unit
°C
°C
V
V
V
mA
%
Reference
1
1, 2, 4
1, 2
1
1, 3
1
1
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
Receiver Differential Data Output Load
DV
DINP-P
V
IH
V
IL
N
P
0.1
100
R
DL
Symbol
T
C
V
CC
Min.
0
3.135
1
175
2.0
V
EE
Typ.
40
3.3
Max.
80
3.465
2.7
1400
V
CC
0.8
200
Unit
°C
V
Gbd
mV
P-P
V
V
mV
P-P
mF
W
Reference
2, Figs. 3
Figs. 5, 6, 12
3
4, Figs. 7, 8
5, Figs. 5, 6
Fig. 7
Fig. 7
Transmitter/Receiver DataI/O Coupling Capacitors C
AC
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.
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.
DV
DINP-P
=
DVDINH
–
DVDINL,
where
DVDINH
= High State
Differential Data Input Voltage and
DVDINL
= 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.
5
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