Application Information
represent 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 curves
represents the remaining OPB
at any link length, which is
available for overcoming non-
fiber cable related losses.
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 T1E1.2 committee, to
establish the optical
The Applications Engineering
group in the Agilent Fiber
Optics Communication Division
is available to assist you with
the technical understanding
and design trade-offs
associated with these trans-
ceivers. You can contact them
through your Agilent sales
representative.
performance requirements for
various fiber optic interface
standards. The cable
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.
The Agilent 1300 nm LEDs are
specified to experience less
than 1 dB of aging over
normal commerical equipment
mission life periods. Contact
your Agilent sales repre-
sentative for additional details.
parameters used come from the
ISO/IEC JTC1/SC 25/WG3
Generic Cabling for Customer
Premises per DIS 11801 docu-
ment and the EIA/TIA-568-A
Commercial Building Telecom-
munications Cabling Standard
per SP-2840.
The following information is
provided to answer some of
the most common questions
about the use of these parts.
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
12
HFBR-5805, 62.5/ 125 µm
10
8
HFBR-5805
50/ 125 µm
6
margin for link aging and
unplanned losses due to cable
plant reconfiguration or repair.
Figure 4 was generated for the
1300 nm transceivers with a
Agilent fiber optic link model
containing the current industry
conventions for fiber cable
specifications and the draft
ANSI T1E1.2. These optical
parameters are reflected in the
4
2
1.
0
Figure 4 illustrates the pre-
dicted OPB associated with the
transceiver series specified in
this data sheet at the Beginning
of Life (BOL). These curves
0
0.3 0.5
1.5
2.0
2.5
FIBER OPTIC CABLE LENGTH (km)
Figure 4. Optical Power Budget at BOL versus
Fiber Optic Cable Length.
5
HP [ HEWLETT-PACKARD ]
