4

Transmitter and Receiver Signaling Rate Range and

BER Performance

For purposes of definition, 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 specification

tables.

The data link modules may be used for other applications

at signaling rates different 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 different rates.

These data link modules can also be used for applications

which require different bit-error-ratio (BER) performance.

Figure 6 illustrates the typical trade-off 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 specifications stated in the following transmitter

and receiver specification 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.

0

200

0

SIGNAL RATE (MBd)

25

75 100 125

2.5

2.0

1.5

1.0

175

HFBR-1116T fig 5

0.5

50

150

CONDITIONS:

2. DATA SAMPLED AT CENTER OF DATA SYMBOL.

4. TA = 25° C

5. VCC = 5 Vdc

6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.

0.5

-6

4

RELATIVE INPUT OPTICAL POWER – dB

-4

2

HFBR-1116T fig 6

-2

0

CONDITIONS:

1. 155 MBd

3. TA = 25° C

4. VCC = 5 Vdc

5. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.

CENTER OF SYMBOL