4
Table 1
The 1 MHz idle signal described in the IEEE 802.3
10Base-FL standard assures that the burst-mode proto-
col used for copper wire Ethernet is converted to a pro-
tocol that will optimize the performance of a fiberoptic
receiver. More details about inexpensive fiberoptic
solutions suitable for use with higher-efficiency block
substitution codes, such as 4B5B, and 8B10B, can be
found in Avago Technologies Application Notes 1122
and 1123. This publication will stay focused on solutions
compatible with unencoded data, because many system
designers need a fiberoptic solution that can use proto-
cols originally developed for use with copper wires.
Distances and Data Rates Achievable
The simple transceivers recommended in this applica-
tion note can be used to address a very wide range
of distances, data rates, and system cost targets. The
maximum distances allowed with various types of
optical fiber when using Avago Technologies’ wide
range of fiberoptic transceiver components are shown
Table 1. One simple calculation is needed to optimize
the receiver for use at the desired maximum symbol rate
of your system application. No transmitter or receiver
adjustments are needed when using fiber cable length
that vary from virtually zero length up to the maximum
distances specified in Table 1.
Transmitter
Component Part #
and Wavelength
Receiver
Component Part #
and Wavelength
Fiber Diameter
Type
Maximum Distance at 32 MBd
with the transceiver circuits
recommended in this publication
HFBR-15X7Z
650 nm LED
HFBR-25X6Z
650 nm
1 mm plastic
step index
27 meters with transmitter in Fig. 3
and receiver in Fig. 4
HFBR-15X7Z
650 nm LED
HFBR-25X6Z
650 nm
1 mm plastic
step index
42 meters with transmitter in Fig. 3
and receiver in Fig. 5
HFBR-15X7Z
650 nm LED
HFBR-25X6Z
650 nm
200 mm
HCS step index
690 meters with transmitter in Fig. 3
and receiver in Fig. 4
HFBR-15X7Z
650 nm LED
HFBR-25X6Z
650 nm
200 mm
HCS step index
1.0 kilometer with transmitter
in Fig. 3 and receiver in Fig. 5
HFBR-14X2Z
820 nm LED
HFBR-24X6Z
820 nm
200 mm
HCS step index
690 meters with transmitter in Fig. 3
and receiver in Fig. 4
HFBR-14X2Z
820 nm LED
HFBR-24X6Z
820 nm
200 mm
HCS step index
1.0 kilometer with transmitter
in Fig. 3 and receiver in Fig. 5
HFBR-14X4Z
820 nm LED
HFBR-24X6Z
820 nm
62.5/125 mm
multimode glass
800 meters with transmitter in Fig. 3
and receiver in Fig. 4
HFBR-14X4Z
820 nm LED
HFBR-24X6Z
820 nm
62.5/125 mm
multimode glass
1.6 kilometers with transmitter
in Fig. 3 and receiver in Fig. 5
HFBR-13X2TZ
1300 nm LED
HFBR-23X6TZ
1300 nm
62.5/125 mm
multimode glass
1.3 kilometers with transmitter
in Fig 3. and receiver in Fig. 4
HFBR-13X2TZ
1300 nm LED
HFBR-23X6TZ
1300 nm
62.5/125 mm
multimode glass
3.3 kilometers with transmitter
in Fig. 3 and receiver in Fig. 5
