5
14
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 commer-
cial equipment mission life
periods. Contact your Agilent
sales representative for additional
details.
When used in FDDI 100 Mbps
applications, the performance of
the 1300 nm transceivers is
guaranteed over the signaling
rate of 10 MBd to 125 MBd to the
full conditions listed in the
individual product specification
tables.
12
10
8
62.5/125 µm
6
50/125 µm
4
2
The transceivers may be used for
other applications at signaling
rates outside of the 10 MBd to
125 MBd range with some
penalty in the link optical power
budget primarily caused by a
reduction of receiver sensitivity.
Figure 5 gives an indication of
the typical performance of these
1300 nm products at different
rates.
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
FIBER OPTIC CABLE LENGTH – km
Figure 4. Optical Power Budget at
BOL vs. Fiber Optic Cable Length.
Figure 4 was generated with a
Agilent fiber-optic link model
containing the current industry
conventions for fiber cable
specifications and the FDDI PMD
optical parameters. These
parameters are reflected in the
guaranteed performance of the
transceiver specifications 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/SC 25/WG3
Generic Cabling for Customer
Premises per DIS 11801
standing and design trade-offs
associated with this transceiver.
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.
These transceivers can also be
used for applications which
require different bit error rate
(BER) performance. Figure 6
illustrates the typical trade-off
between link BER and the
receiver’s input optical power
level.
Transceiver 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
3.0
2.5
unplanned losses due to cable
plant reconfiguration or repair.
2.0
1.5
1.0
0.5
0
document and the EIA/TIA-568-A
Commercial Building Telecom-
munications Cabling Standard per
SP-2840.
Figure 4 illustrates the predicted
OPB associated with the trans-
ceivers specified in this data
sheet at the Beginning of Life
(BOL). This curve represents the
attenuation and chromatic plus
modal dispersion losses
associated with the 62.5/125 µm
and 50/125 µm fiber cables only.
The area under the curve
Transceiver Signaling
Operating Rate Range and
BER Performance
For purposes of definition, the
symbol rate (Baud), also called
signaling rate, is the reciprocal of
the symbol time. Data rate (bits/
sec) is the symbol rate divided by
the encoding factor used to
0
25 50 75 100 125 150 175 200
SIGNAL RATE (MBd)
CONDITIONS:
7
1. PRBS 2 -1
2. DATA SAMPLED AT CENTER OF DATA SYMBOL.
-6
3. BER = 10
4. T = 25° C
A
5. V
= 5 V
dc
CC
6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.
represents the remaining OPB at
any link length, which is available
for overcoming non-fiber cable
related losses.
encode the data (symbols/bit).
Figure 5. Transceiver Relative
Optical Power Budget at Constant
BER vs. Signaling Rate.
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