4
Transmitter and Receiver Signaling Rate Range and
BER Performance
For purposes of denition, the symbol rate (Baud), also
called signaling rate, is the reciprocal of the symbol time.
Data rate (bits/sec) is the symbol rate divided by the
encoding factor used to encode the data (symbols/bit).
When used in 115 Mbps SONET OC-3 applications, the
performance of Avago Technologies’ 1300 nm data link
modules, HFBR- 1116TZ/-2116TZ, is guaranteed to the full
conditions listed in the individual product specication
tables.
The data link modules may be used for other applications
at signaling rates dierent than the 155 Mbps with some
variation in the link optical power budget. Figure 5 gives
an indication of the typical performance of these 1300 nm
products at dierent rates.
These data link modules can also be used for applications
which require dierent bit-error-ratio (BER) performance.
Figure 6 illustrates the typical trade-o between link BER
and the receiver input optical power level.
Data Link Jitter Performance
The Avago 1300 nm data link modules are designed to
operate per the system jitter allocations stated in Table B1
of Annex B of the ANSI T1E1.2 Revision 3 standard.
The 1300 nm transmitter will tolerate the worst-case input
electrical jitter allowed in Annex B without violating the
worst-case output jitter requirements.
The 1300 nm receiver will tolerate the worst-case input
optical jitter allowed in Annex B without violating the
worst-case output electrical jitter allowed.
The jitter specications stated in the following transmitter
and receiver specication table are derived from the
values in Table B1 of Annex B. They represent the worst-
case jitter contribution that the transmitter and receiver
are allowed to make to the overall system jitter without
violating the Annex B allocation example. In practice, the
typical jitter contribution of the Avago Technologies’ data
link modules is well below the maximum amounts.
Recommended Handling Precautions
It is advised that normal static precautions be taken in
the handling and assembly of these data link modules to
prevent damage which may be induced by electrostatic
discharge (ESD). The HFBR-1116TZ/-2116TZ series meets
MIL-STD-883C Method 3015.4 Class 2.
Care should be taken to avoid shorting the receiver Data
or Signal Detect Outputs directly to ground without
proper currentlimiting impedance.
Solder and Wash Process Compatibility
The transmitter and receiver are delivered with protec-
tive process caps covering the individual ST* ports. These
process caps protect the optical subassemblies during
wave solder and aqueous wash processing and act as dust
covers during shipping.
These data link modules are compatible with either
industry standard wave- or hand-solder processes.
Figure 5. Transmitter/Receiver relative optical power budget at constant BER
vs. signaling rate.
Figure 6. Bit error ratio vs. relative receiver input optical power.
TRANSMITTER/RECEIVER RELATIVE OPTICAL
POWER BUDGET AT CONSTANT BER (dB)
0 200
0
SIGNAL RATE (MBd)
25 75 100 125
2.5
2.0
1.5
1.0
175
0.5
50 150
CONDITIONS:
1. PRBS 2
7
-1
2. DATA SAMPLED AT CENTER OF DATA SYMBOL.
3. BER = 10
-6
4. T
A
= 25° C
5. V
CC
= 5 Vdc
6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.
0.5
-6 4
1 x 10
-2
RELATIVE INPUT OPTICAL POWER – dB
-4 2
-2 0
1 x 10
-4
1 x 10
-6
1 x 10
-8
1 x 10
-10
1 x 10
-11
CONDITIONS:
1. 155 MBd
2. PRBS 2
7
-1
3. T
A
= 25° C
4. V
CC
= 5 Vdc
5. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.
1 x 10
-12
1 x 10
-9
1 x 10
-7
1 x 10
-5
1 x 10
-3
CENTER OF SYMBOL
