3
O
FIBER OPTIC CABLE LENGTH – km
4
2
0.5
8
1
0
6
0
2
1.5
1
3
5
7
62.5/125 μm
50/125 μm
Each transmitter and receiver
package includes an internal shield
for the electrical subassembly to
ensure low EMI emissions and high
immunity to external EMI fields.
The outer housing, including the
ST* port, is molded of filled, non-
conductive plastic to provide
mechanical strength and electrical
isolation. For other port styles,
please contact your Agilent Sales
Representative.
Each data-link module is attached
to a printed circuit board via the
16-pin DIP interface. Pins 8 and 9
provide mechanical strength for
these plastic-port devices and will
provide port-ground for forthcom-
ing metal-port modules.
Application Information
The Applications Engineering
group of the Optical Communi-
cation Division is available to assist
you with the technical understand-
ing and design tradeoffs associated
with these transmitter and receiver
modules. You can contact them
through your Agilent sales
representative.
The following information is
provided to answer some of the
most common questions about the
use of these parts.
Transmitter and Receiver
Optical Power Budget
versus Link Length
The Optical Power Budget (OPB)
is the available optical power for a
fiber-optic link to accommodate
fiber cable losses plus losses due to
in-line connectors, splices, optical
switches, and to provide margin for
link aging and unplanned losses
due to cable plant reconfiguration
or repair.
Figure 4 illustrates the predicted
OPB associated with the trans-
mitter and receiver specified in this
data sheet at the Beginning of Life
(BOL). This curve represents the
attenuation and chromatic plus
modal dispersion losses associated
with 62.5/125
μ
m and 50/125
μ
m
fiber cables only. The area under
the curve represents the remaining
OPB at any link length, which is
available for overcoming non-fiber
cable related losses.
Agilent LED technology has
produced 1300 nm LED devices
with lower aging characteristics
than normally associated with
these technologies in the industry.
The industry convention is 1.5 dB
aging for 1300 nm LEDs; however,
HP 1300 nm LEDs will experience
less than 1 dB of aging over
normal commercial equipment
mission-life periods. Contact your
Agilent sales representative for
additional details.
Figure 4 was generated with an
Agilent fiber-optic link model
containing the current industry
conventions for fiber cable
specifications and Fibre Channel
optical parameters. These
parameters are reflected in the
guaranteed performance of the
transmitter and receiver specifica-
tions in this data sheet. This same
model has been used extensively in
the ANSI and IEEE committees,
including the ANSI X3T9.5
committee, to establish the optical
performance requirements for
various fiber-optic interface
standards. The cable parameters
used come from the ISO/IEC JTC1/
*ST is a registered trademark of AT&T Lightguide Cable Connectors.
Figure 3. Pinout Drawing.
Figure 4. Optical Power Budget at
BOL vs. Fiber Optic Cable Length.
NC
8
9
NC
GND
7
10
NO PIN
V
CC
V
CC
GND
6
11
GND
5
12
GND
4
13
GND
DATA
3
14
GND
DATA
2
15
V
BB
NC
1
16
NC
OPTICAL PORT
TRANSMITTER
NC
8
9
NC
NO PIN
7
10
GND
GND
6
11
V
CC
V
CC
V
CC
GND
5
12
GND
4
13
SD
3
14
DATA
SD
2
15
DATA
NO PIN
1
16
NC
OPTICAL PORT
RECEIVER