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AFBR-5803AQZ

FDDI, 100 Mb/s ATM, and Fast Ethernet Transceivers in Low Cost 1 x 9 Package Style

Avago Technologies 

Application Information

The Applications Engineering group in the Avago Tech-

nologies Fiber Optics Communication Division is available

to assist you with the technical under­standing and design

trade-offs associated with these trans­ceivers. You can

contact them through your Avago Technologies sales

representative.

The following information is provided to answer some

of the most common questions about the use of these

parts.

Transceiver Optical Power Budget versus Link Length

Optical Power Budget (OPB) is the available optical

power for a fiber optic link to accommodate fiber cable

losses plus losses due to in-line connectors, splices,

optical switches, and to provide margin for link aging

and unplanned losses due to cable plant reconfiguration

or repair.

Figure 4 illustrates the pre­dicted OPB associated with

the transceiver series specified in this data sheet at the

Beginning of Life (BOL). These curves represent the at-

tenuation and chromatic plus modal dispersion losses as-

sociated with the 62.5/125 µm and 50/125 µm fiber cables

only. The area under the curves represents the remaining

OPB at any link length, which is available for overcoming

non-fiber cable related losses.

Avago Technologies LED technol­ogy has produced

1300 nm LED devices with lower aging characteristics

than normally associated with these technologies in the

industry. The industry conven­tion is 1.5 dB aging for 1300

nm LEDs. The Avago Technologies 1300 nm LEDs will

experience less than 1 dB of aging over normal com­mer­

cial equip­ment mission life periods. Contact your Avago

Technologies sales repre­sentative for additional details.

Figure 4 was generated with a Avago Technologies fiber

optic link model containing the current industry conven-

tions for fiber cable specifications and the FDDI PMD

and LCF-PMD optical parameters. These parameters are

reflected in the guaranteed performance of the trans-

ceiver specifications in this data sheet. This same model

has been used extensively in the ANSI and IEEE commit-

tees, including the ANSI X3T9.5 committee, to establish

the optical performance require­ments for various fiber

optic interface standards. The cable parameters used

come from the ISO/IEC JTC1/SC 25/WG3 Generic Cabling

for Customer Premises per DIS 11801 docu­ment and the

EIA/TIA-568-A Commercial Building Telecom­munications

Cabling Standard per SP-2840.

Transceiver Signaling Operating Rate Range and BER

Performance

For purposes of definition, the symbol (Baud) rate, also

called signaling rate, is the reciprocal of the shortest

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 Fast Ethernet, FDDI and ATM 100 Mb/s ap-

plications the performance of the 1300 nm transceivers

is guaranteed over the signaling rate of 10 MBd to 125

MBd to the full conditions listed in individual product

specification tables.

The transceivers may be used for other applications at

signal­ing rates outside of the 10 MBd to 125 MBd range

with some penalty in the link optical power budget

primarily caused by a reduction of receiver sensitivity.

Figure 5 gives an indication of the typical performance of

these 1300 nm products at different rates.

These transceivers can also be used for applications which

require different Bit Error Rate (BER) performance. Figure 6

illustrates the typical trade-off between link BER and the

receivers input optical power level.

12

AFBR-5803, 62.5/125 µm

10

8

AFBR-5803

6

50/125 µm

4

2

0 0.3 0.5

1.0

1.5

2.0

2.5

FIBER OPTIC CABLE LENGTH (km)

Figure 4. Optical Power Budget at BOL versus Fiber

Optic Cable Length.



2.5

2.0

CONDITIONS:

1. PRBS 27-1

1.5

2. DATA SAMPLED

AT CENTER OF

DATA SYMBOL.

1.0

3. BER = 10-6

4. TA = +25˚ C

0.5

5. VCC = 3.3 V to 5 V dc

6. INPUT OPTICAL

RISE/FALL TIMES

0

= 1.0/2.1 ns.

0.5

0 25 50 75 100 125 150 175 200

SIGNAL RATE (MBd)

Figure 5. Transceiver Relative Optical Power Budget at Constant BER vs.

Signaling Rate.

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