3
Each transmitter and receiver package includes an internal
shield for the electrical subassembly to ensure low EMI
emissions and high immunity to external EMI elds.
The outer housing, including the ST* port, is molded
of lled, nonconductive plastic to provide mechanical
strength and electrical isolation. For other port
styles, please contact your Avago Technologies 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 forthcoming metal-port
modules.
Application Information
The Applications Engineering group of the Fiber Optics
Product Division is available to assist you with the technical
understanding and design tradeos associated with these
transmitter and receiver modules. You can contact them
through your Avago Technologies 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 ber-optic link to accommodate ber 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 reconguration or
repair.
Figure 4 illustrates the predicted OPB associated with
the transmitter and receiver specied 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 μm and 50/125 μm ber cables
only. The area under the curve represents the remaining
OPB at any link length, which is available for overcoming
non-ber cable related losses.
Avago LED technology has produced 1300 nm LED devices
with lower aging characteristics than normally associated
with these technologies in the industry. The industry con-
vention is 1.5 dB aging for 1300 nm LEDs; however, Avago
1300 nm LEDs will experience less than 1 dB of aging
over normal commercial equipment mission-life periods.
Contact your Avago Technologies sales representative for
additional details.
Figure 4 was generated with an Avago ber-optic link
model containing the current industry conventions for
ber cable specications and the draft ANSI T1E1.2. These
parameters are reected in the guaranteed performance
of the transmitter and receiver specications in this data
sheet. This same model has been used extensively in the
ANSI and IEEE committees, including the ANSI T1E1.2
committee, to establish the optical performance require-
ments for various beroptic interface standards. The cable
parameters used come from the ISO/IEC JTC1/SC 25/WG3
Generic Cabling for Customer Premises per DIS 11801
document and the EIA/TIA-568-A Commercial Building
Telecommunications Cabling Standard per SP-2840.
Figure 3. Pinout drawing. Figure 4. Optical power budget at BOL vs. ber optic cable length.
NC
8
9NC
GND
7
10 NO PIN
V
CC
6
11 GND
V
CC
5
12 GND
GND
4
13 GND
DATA
3
14 GND
DATA
2
15 V
BB
NC
1
16 NC
OPTICAL PORT
TRANSMITTER
NC
8
C
NO PIN
7
10 GND
GND
6
11 V
CC
GND
5
12 V
CC
GND
4
13 V
CC
SD
3
14 DATA
SD
2
15 DATA
NO PIN
1
16 NC
OPTICAL PORT
RECEIVER
OPTICAL POWER BUDGET (dB)
0
FIBER OPTIC CABLE LENGTH (km)
0 1.0 1.5
10
8
4
2.5
2
0.3 2.0
6
0.5
62.5/125 µm
50/125 µm
* ST is a registered trademark of AT&T Lightguide Cable Connectors.
