參數(shù)資料
型號： HFBR-5208
英文描述： 1300 nm LED Transceiver for ATM, SONET/SDH 622 Mb/s and General Purpose 155 - 650 Mb/s(應(yīng)用于ATM, SONET/SDH 622 Mb/s和 通用155 - 650 Mb/s的1300 nm LED收發(fā)器)
中文描述： 1300納米的LED自動取款機(jī)，收發(fā)器的SONET / SDH的622 Mb / s和通用155 - 650 Mb /秒（應(yīng)用于自動取款機(jī)，SONET / SDH的622 Mb / s的和通用155 - 650 Mb / s的的1300納米發(fā)光收發(fā)器）
文件頁數(shù)： 2/12頁
文件大?。?/td> 163K
代理商： HFBR-5208
2
Transmitter Section
The transmitter section of this
transceiver is similar to 1300 nm
LED transceivers in use at the
155 Mb/s rate today. It consists of
a 1300 nm InGaAsP LED in an
optical subassembly (OSA) which
mates to the fiber cable. The LED
OSA is driven by a custom, silicon
bipolar IC which converts
differential PECL logic signals,
ECL referenced to a +5 V supply,
into an analog LED drive current.
Receiver Section
The receiver starts with an
InGaAs PIN photodiode mounted
together with a custom, silicon
bipolar transimpedance pre-
amplifier IC in an OSA. This OSA
is mated to a custom, silicon
bipolar circuit providing post
amplification and quantization
and optical signal detection.
The custom, silicon bipolar circuit
includes a Signal Detect circuit
which provides a PECL logic high
output upon detection of a usable
input optical signal level. This
single ended PECL output is
designed to drive a standard
PECL input through normal 50
PECL load.
Applications Information
Typical BER Performance of
Receiver versus Input Optical
Power Level
The HFBR-5208 transceiver can
be operated at Bit-Error-Ratio
conditions other than the required
BER = 1 x 10
-10
of the 622 MBd
ATM Forum 622.08 Mb/s Physical
Layer Standard. The typical
trade-off of BER versus Relative
Input Optical Power is shown in
Figure 1. The Relative Input
Optical Power in dB is referenced
to the Input Optical Power para-
meter value in the Receiver Optical
Characteristics table. For better
BER condition than 1 x 10
-10
,
more input signal is needed
(+dB). For example, to operate
the HFBR-5208 at a BER of
1 x 10
-12
, the receiver will require
an input signal approximately
0.6 dB higher than the -26 dBm
level required for 1 x 10
-10
operation, i.e. -25.4 dBm.
An informative graph of a typical,
short fiber transceiver link
performance can be seen in
Figure 2. This figure is of Relative
Input Optical Power versus
Sampling Time Position within
the receiver output data eye-
opening. The given curves are at a
constant bit-error-ratio (BER) of
10
-10
for four different signaling
rates, 155 Mbd, 311 Mbd, 622 Mbd
and 650 Mbd. These curves,
called “tub” diagrams for their
shape, show the amount of data
eye-opening time-width for
various receiver input optical
power levels. A wider data eye-
opening provides more time for
the clock recovery circuit to
operate within without creating
errors. The deeper the tub is
indicates less input optical power
is needed to operate the receiver
at the same BER condition.
Generally, the wider and deeper
the tub is the better. The relative
receiver input optical power
amount (dB) is referenced to the
absolute level (dBm avg.) given in
the Receiver Optical
Characteristics table. The 0 ns
sampling time position for this
Figure 2 refers to the center of
the Baud interval for the
particular signaling rate. The
Baud interval is the reciprocal of
the signaling rate in Mbd. For
example, at 622 Mbd the Baud
interval is 1.61 ns, at 155 Mbd the
Baud interval is 6.45 ns. Test
conditions for this tub diagram
are listed in Figure 2.
The HFBR-5208 receiver input
optical power requirements vary
slightly over the signaling rate
range of 20 Mbd to 700 Mbd for a
constant bit-error-ratio (BER) of
10
-10
condition. Figure 3
illustrates the typical receiver
relate input optical power varies
by <0.7 dB over this full range.
This small sensitivity variation
allows the optical budget to
remain nearly constant for
designs that make use of the
broad signaling rate range of the
HFBR-5208. The curve has been
normalized to the input optical
power level (dBm avg.) of the
receiver for 622 Mbd at center of
the Baud interval with a BER of
10
-10
. The data patterns that can
be used at these signaling rates
should be, on average, balanced
duty factor of 50%. Momentary
excursions of less or more data
duty factor than 50% can occur,
but the overall data pattern must
remain balanced. Unbalanced
data duty factor will cause
excessive pulse-width distortion,
or worse, bit errors. The test
conditions are listed in Figure 3.
Recommended Circuit
Schematic
When designing the HFBR-5208
circuit interface, there are a few
fundamental guidelines to follow.
For example, in the Recommended
Circuit Schematic, Figure 4, the
differential data lines should be
treated as 50 ohm Microstrip or
10
-2
10
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
10
-13
10
-14
10
-15
-5
LINEAR EXTRAPOLATION OF
10
-4
THROUGH 10
-7
DATA
ACTUAL DATA
RELATIVE INPUT OPTICAL POWER - dBm Avg.
Figure 1. Relative Input Optical
Power - dBm Average.
B
-4
-3
-2
-1
0
1
2
3
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