12
Notes:
1. This is the maximum voltage that can be applied across the Dierential Transmitter Data Inputs to prevent damage to the input ESD protec-
tion circuit.
2. The data outputs are terminated with 50: .
The Loss of Signal output is terminated with 50 : connected to a pull-up resistor of 4.7 K: tied to V
CC
.
3. The power supply current needed to operate the transmitter is provided to dierential ECL circuitry. This circuitry maintains a nearly constant
current ow from the power supply. Constant current operation helps to prevent unwanted electrical noise from being generated and con-
ducted or emitted to neighboring circuitry.
4. This is the receiver supply current measured in mA.
5a. The power dissipation of the transmitter is calculated as the sum of the products of supply voltage and current.
5b. The power dissipation of the receiver 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.
6a. Dierential Output Voltage is internally ac coupled. The Loss of Signal low and high voltages are measured with load condition as mentioned
in note 2.
6b. Data and Data-bar outputs are squelched at LOS assert level. When the received light drops below LOS assert point, it will force receiver data
and data-bar to go to steady PECL levels High and Low respectively.
7. The data output rise and fall times are measured between 20% and 80% levels.
Transmitter Optical Characteristics
HFBR-57E0LZ/PZ(T
C
= 0 ºC to +70 ºC, V
CC
= 2.97 V to 3.63 V)
HFBR-57E0ALZ/APZ (T
C
= -40 ºC to +85 ºC, V
CC
= 2.97 V to 3.63 V)
Parameter Symbol Minimum Typical Maximum Units Notes
Output Optical Power BOL
62.5/125 μm, NA = 0.275 Fiber EOL
P
O
-19
-20
-15.7 -14 dBm avg 8
Output Optical Power BOL
50/125 μm, NA = 0.20 Fiber EOL
P
O
-22.5
-23.5
-14 dBm avg 8
Transmitter Disable (High) P
O(o)
-45 dBm
Center Wavelength
O
C
1270 1308 1380 nm 21, Figure 3
Spectral Width - FWHM
Spectral Width - RMS
'O
147
63
nm 9, 21, Figure 3
Optical Rise Time t
r
0.6 1.2 3.0 ns 10, 21, Figure 3
Optical Fall Time t
f
0.6 2.0 3.0 ns 10, 21, Figure 3
Systematic Jitter Contributed by the Transmit-
ter - OC-3
SJ 0.25 1.2 ns p-p 11a
Duty Cycle Distortion Contributed by the
Transmitter - FE
DCD 0.20 0.6 ns p-p 11b
Data Dependent Jitter Contributed by the
Transmitter - FE
DDJ 0.07 0.6 ns p-p 11c
Random Jitter Contributed by the Transmitter
OC-3
FE
RJ
0.10
0.10
0.52
0.69
ns
p-p
12a
12b
Notes:
8. These optical power values are measured with the following conditions:
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 wave-
length LEDs. The actual degradation observed in Avago’s 1300 nm LED products is < 1 dB, as specied in this data sheet. Over the specied
operating voltage and temperature ranges. With 25 MBd (12.5 MHz square-wave), input signal.
At the end of one meter of noted optical ber with cladding modes removed. 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. Please consult with your local Avago sales
representative for further details.
9. 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.
10. 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 dening an eye pattern mask for the transmitter optical output as an item
for further study. Avago will incorporate this requirement into the specications for these products if it is dened. The HFBR-57E0 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 lter normally associated with single mode ber measurements which is the likely source for the ANSI T1E1.2 committee to follow in
this matter.
