square-wave) input signal, the average
optical power is measured. The data “1”
peak power is then calculated by adding
3 dB to the measured average optical
power. The data “0” output optical power is
found by measuring the optical power when
the transmitter is driven by a logic “0” input.
The extinction ratio is the ratio of the optical
power at the “0” level compared to the
optical power at the “1” level expressed as
a percentage or in decibels.
Notes:
• At the Beginning of Life (BOL)
1. This is the maximum voltage that can be
applied across the Differential Transmitter
Data Inputs to prevent damage to the input
ESD protection circuit.
• Over the specified operating temperature
and voltage ranges
23
• Input is a 155.52 MBd, 2 - 1 PRBS data
pattern with 72 “1”s and 72 “0”s inserted
per the CCITT (now ITU-T) recommenda-
tion G.958 Appendix I.
2. The outputs are terminated with 50 W
connected to V -2 V.
CC
3. The power supply current needed to operate
the transmitter is provided to differential
ECL circuitry. This circuitry maintains a
nearly constant current flow from the power
supply. Constant current operation helps to
prevent unwanted electrical noise from
being generated and conducted or emitted
to neighboring circuitry.
• Receiver data window time-width is
1.23 ns or greater for the clock recovery
circuit to operate in. The actual test data
window time-width is set to simulate the
effect of worst case optical input jitter
based on the transmitter jitter values
from the specification tables. The test
window time-width is HFBR-5805 3.32 ns.
10. The transmitter will provide this low level of
Output Optical Power when driven by a logic
“0” input. This can be useful in link
troubleshooting.
11. The relationship between Full Width Half
Maximum and RMS values for Spectral
Width is derived from the assumption of a
Gaussian shaped spectrum which results in
a 2.35 X RMS = FWHM relationship.
4. This value is measured with the outputs
• Transmitter operating with a 155.52 MBd,
77.5 MHz square-wave, input signal to
simulate any cross-talk present between
the transmitter and receiver sections of
the transceiver.
terminated into 50 W connected to V - 2 V
and an Input Optical Power level of
-14 dBm average.
CC
The optical rise and fall times are measured
from 10% to 90% when the transmitter is
driven by a 25 MBd (12.5 MHz square-wave)
input signal. The ANSI T1E1.2 committee
has designated the possibility of defining an
eye pattern mask for the transmitter optical
output as an item for further study. Agilent
will incorporate this requirement into the
specifications for these products if it is
defined. The HFBR-5805 products typically
comply with the template requirements of
CCITT (now ITU-T) G.957 Section 3.2.5,
Figure 2 for the STM-1 rate, excluding the
optical receiver filter normally associated
with single mode fiber measurements which
is the likely source for the ANSI T1E1.2
committee to follow in this matter.
5. The power dissipation value is the power
dissipated in the receiver itself. Power
dissipation is calculated as the sum of the
products of supply voltage and currents,
minus the sum of the products of the output
voltages and currents.
15. All conditions of Note 14 apply except that
the measurement is made at the center of
the symbol with no window time-width.
16. Systematic Jitter contributed by the
receiver is defined as the combination of
Duty Cycle Distortion and Data Dependent
Jitter. Systematic Jitter is measured at 50%
threshold using a 155.52 MBd (77.5 MHz
6. This value is measured with respect to V
CC
with the output terminated into 50 W
connected to V - 2 V.
CC
7
square-wave), 2 - 1 psuedo random data
7. The output rise and fall times are measured
between 20% and 80% levels with the
pattern input signal.
output connected to V -2 V through 50 W.
17. Random Jitter contributed by the receiver is
specified with a 155.52 MBd (77.5 MHz
square-wave)input signal.
CC
8. These optical power values are measured
with the following conditions:
18. This value is measured during the transition
from low to high levels of input optical
power.
• The Beginning of Life (BOL) to the End of
Life (EOL) optical power degradation is
typically 1.5 dB per the industry
convention for long wavelength LEDs.
The actual degradation observed in
Agilent’s 1300 nm LED products is
< 1 dB, as specified in this data sheet.
12. Systematic Jitter contributed by the
transmitter is defined as the combination of
Duty Cycle Distortion and Data Dependent
Jitter. Systematic Jitter is measured at 50%
threshold using a 155.52 MBd
19. This value is measured during the transition
from high to low levels of input optical
power.
7
20. The Signal Detect output shall be asserted
within 100 µs after a step increase of the
Input Optical Power.
(77.5 MHz square-wave), 2 -1 psuedo
• Over the specified operating voltage and
temperature ranges.
random data pattern input signal.
13. Random Jitter contributed by the
transmitter is specified with a 155.52 MBd
(77.5 MHz square-wave) input signal.
• With 25 MBd (12.5 MHz square-wave),
inputsignal.
21. Signal detect output shall be de-asserted
within 350 µs after a step decrease in the
Input Optical Power.
• At the end of one meter of noted optical
fiber with cladding modes removed.
14. This specification is intended to indicate the
performance of the receiver section of the
transceiver when Input Optical Power signal
characteristics are present per the following
definitions. The Input Optical Power
22. The HFBR-5805 transceiver complies with
the requirements for the trade-offs between
center wavelength, spectral width, and rise/
fall times shown in Figure 9. This figure is
derived from the FDDI PMD standard (ISO/
IEC 9314-3 : 1990 and ANSI X3.166 - 1990)
per the description in ANSI T1E1.2 Revision
3. The interpretation of this figure is that
values of Center Wavelength and Spectral
Width must lie along the appropriate Optical
Rise/ Fall Time curve.
The average power value can be converted
to a peak power value by adding 3 dB.
Higher output optical power transmitters
are available on special request.
dynamic range from the minimum level (with
a window time-width) to the maximum level
is the range over which the receiver is
9. The Extinction Ratio is a measure of the
modulation depth of the optical signal. The
data “0” output optical power is compared
to the data “1” peak output optical power
and expressed as a percentage. With the
transmitter driven by a 25 MBd (12.5 MHz
guaranteed to provide output data with a Bit
Error Ratio (BER) better than or equal to 1 x
-10
10
.
HP [ HEWLETT-PACKARD ]
