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參數(shù)資料
| 型號： | HFBR-0571 |
| 英文描述： | Evaluation Kit for Small Form Factor Pluggable (SFP) Gigabit Ethernet and Fibre Channel Applications |
| 中文描述： | 評價(jià)小型可插拔（SFP）千兆以太網(wǎng)和光纖通道應(yīng)用套件 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 446K |
| 代理商： | HFBR-0571 |
4
APPLICATION SUPPORT
Optical Power Budget
and Link Penalties
The worst-case Optical Power
Budget (OPB) in dB for a fiber-
optic link is determined by the
difference between the minimum
transmitter output optical power
(dBm avg.) and the lowest receiver
sensitivity (dBm avg.). This OPB
provides the necessary optical
signal range to establish a working
fiber-optic link. The OPB is
allocated for the fiber-optic cable
length and the corresponding link
penalties. For proper link
performance, all penalties that
affect the link performance must
be accounted for within the link
optical power budget.
Data Line
Interconnections
Agilent’s HFBR/HFCT-53D3 fiber-
optic transceiver is designed to
directly couple to +5 V PECL
signals. The transmitter inputs
are internally dc-coupled to the
laser driver circuit from the
transmitter input pins (pins 7, 8).
There is no internal, capacitively-
coupled 50 Ohm termination
resistance within the transmitter
input section. The transmitter
driver circuit for the laser light
source is a dc-coupled circuit.
This circuit regulates the output
optical power. The regulated light
output will maintain a constant
output optical power provided the
data pattern is reasonably
balanced in duty factor. If the
data duty factor has long,
continuous state times (low or
high data duty factor), then the
output optical power will
gradually change its average
output optical power level to its
preset value.
As for the receiver section, it is
internally ac-coupled between the
preamplifier and the post-
amplifier stages. The actual Data
and Data-bar outputs of the post-
amplifier are dc-coupled to their
respective output pins (pins 2, 3).
Signal Detect is a single-ended,
+5 V PECL output signal that is
dc-coupled to pin 4 of the module.
Signal Detect should not be ac-
coupled externally to the
follow-on circuits because of its
infrequent state changes.
Caution should be taken to account
for the proper interconnection
between the supporting Physical
Layer integrated circuits and this
HFBR/HFCT-53D3 transceiver.
Figure 3 illustrates a
recommended interface circuit
for interconnecting to a +5 V dc
PECL fiber-optic transceiver.
Some fiber-optic transceiver
suppliers’ modules include
internal capacitors, with or
without 50 Ohm termination, to
couple their Data and Data-bar
lines to the I/O pins of their
module. When designing to use
these type of transceivers along
with Agilent transceivers, it is
important that the interface
circuit can accommodate either
internal or external capacitive
coupling with 50 Ohm termination
components for proper operation
of both transceiver designs. The
internal dc-coupled design of the
HFBR/HFCT-53D3 I/O
connections was done to provide
the designer with the most
flexibility for interfacing to
various types of circuits.
Eye Safety Circuit
For an optical transmitter device
to be eye-safe in the event of a
single fault failure, the transmitter
must either maintain normal, eye-
safe operation or be disabled.
In the HFBR-53D3 there are three
key elements to the laser driver
safety circuitry: a monitor diode,
a window detector circuit and
direct control of the laser bias.
The window detection circuit
monitors the average optical
power using the monitor diode. If
a fault occurs such that the
transmitter dc regulation circuit
cannot maintain the preset bias
conditions for the laser emitter
within ±20%, the transmitter will
automatically be disabled. Once
this has occurred, only an
electrical power reset will allow
an attempted turn-on of the
transmitter.
The HFCT-53D3 utilizes an
integral fiber stub along with a
current limiting circuit to
guarantee eye-safety. It is
intrinsically eye safe and does not
require shut down circuitry.
Signal Detect
The Signal Detect circuit provides
a deasserted output signal that
implies the link is open or the
transmitter is OFF. The Signal
Detect threshold is set to
transition from a high to low state
between the minimum receiver
input optional power and -30 dBm
avg. input optical power
indicating a definite optical fault
(e.g. unplugged connector for the
receiver or transmitter, broken
fiber, or failed far-end transmitter
or data source). A Signal Detect
indicating a working link is
functional when receiving
encoded 8B/l0B characters. The
Signal Detect does not detect
receiver data error or error-rate.
Data errors are determined by
Signal processing following the
transceiver.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HFBR-0572 | Evaluation Kit for SFF PTH Multimode Fibre Channel Applications |
| HFBR-0573 | Evaluation Kit for GBIC Gigabit Ethernet or Fibre Channel Applications |
| HFBR-1315M | FIBER OPTIC TRANSMITTER |
| HFBR-1315TM | FIBER OPTIC TRANSMITTER |
| HFBR-1412T | Low Cost. Miniature Fiber Optic Transmitter with Threaded ST Port |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HFBR-0572 | 功能描述:光學(xué)纖維開發(fā)工具 2G FC SFF MM Evaluation Kit RoHS:否 制造商:Omron Electronics 產(chǎn)品:Evaluation Boards 用于:SX51 封裝: |
| HFBR-0573 | 功能描述:光學(xué)纖維開發(fā)工具 SW/LW GbE / FC GBIC Evaluation Board RoHS:否 制造商:Omron Electronics 產(chǎn)品:Evaluation Boards 用于:SX51 封裝: |
| HFBR-0600 | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:SERCOS Fiber Optic Transmitters and Receiver |
| HFBR-0600Z | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:SERCOS Fiber Optic Transmitters and Receivers |
| HFBR1100 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
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