Application Information
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12
10
ꢀ
The Applications Engineering group in the Avago Tech-
nologies Optical Communication Division is available to
assist you with the technical understanding and design
trade-offs associated with these transceivers. You can
contact them through your Avago Technologies sales
representative.
AFBR-5103Z, 62.5/125 µꢁ
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The following information is provided to answer some
of the most common questions about the use of these
parts.
AFBR-5103Z,
50/125 µꢁ
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2
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Transceiver Optical Power Budget versus Link Length
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.
0.15 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
FIBER OPTIC CABLE LENGTH (kꢁ)
Figure 4. Optical Power Budget at BOL versus Fiber Optic Cable
Length.
Figure 4 illustrates the predicted OPB associated with the
transceiver series specified in this data sheet at the Be-
ginning of Life (BOL). These curves represent the attenu-
ation and chromatic plus modal dispersion losses associ-
ated with the 62.5/125 μm and 50/125 μm fiber cables
only. The area under the curves represents the remaining
OPB at any link length, which is available for overcoming
non-fiber cable related losses.
Transceiver Signaling Operating Rate Range and BER
Performance
For purposes of definition, the symbol (Baud) rate,
also called signaling rate, is the reciprocal of the short-
est symbol time. Data rate (bits/sec) is the symbol rate
divided by the encoding factor used to encode the data
(symbols/bit).
Avago technologies’ LED technology has produced 1300
nm LED devices with lower aging characteristics than
normally associated with these technologies in the in-
dustry. The industry convention is 1.5 dB aging for 1300
nm LEDs. The Avago Technologies 1300 nm LEDs will
experience less than 1dB of aging over normal commer-
cial equipment mission life periods. Contact your Avago
Technologies sales representative for additional details.
When used in FDDI and ATM 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 individual product specification
tables.
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.
Figure 4 was generated with an Avago Technologies’
fiber optic link model containing the current industry
conventions for fiber cable specifications and the FDDI
PMD and LCF-PMD optical parameters. These parameters
are reflected in the guaranteed performance of the trans-
ceiver specifications in this data sheet. This same model
has been used extensively in the ANSI and IEEE commit-
tees, 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 document and the
EIA/TIA-568-A Commercial Building Telecommunications
Cabling Standard per SP-2840.
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 receivers input optical power level.
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