AFCT-5943LZ Datasheet AFCT-5943ALZ, AFCT-5943LZ | P1-P3

AFCT-5943LZ, AFCT-5943ALZ

Single Mode SFF Transceivers for SONET

OC-48/SDH STM-16 Multirate Operation

(Part of the Avago Technologies’ METRAK family)

Data Sheet

Description

The AFCT-5943xxZ are high performance, cost eective

modules for serial optical data communications applica-

tions that range from 125 Mb/s to 2.7 Gb/s. They are de-

signed to provide SONET/SDH compliant links at 2488

Mb/s for short reach links.

The modules are designed for single mode ber and

operate at a nominal wavelength of 1300 nm. They in-

corporate high performance, reliable, long wavelength

optical devices and proven circuit technology to give

long life and consistent service.

The transmitter section of the AFCT-5943LZ/ALZ incor-

porates a 1300 nm Fabry Perot (FP) laser. The transmit-

ter has full IEC 825 and CDRH Class 1 eye safety.

For each device the receiver section uses an MOVPE

grown planar SEDET PIN photodetector for low dark

current and excellent responsivity.

A positive ECL logic interface simplies interface to ex-

ternal circuitry.

The transceivers are supplied in the new industry stan-

dard 2 x 5 DIP style package with the LC ber connector

interface and is footprint compatible with SFF Multi

Source Agreement (MSA).

Features

• Multirate operation from 125 Mb/s to 2.7 Gb/s

• AFCT-5943LZ/ALZ: Links of 2 km with 9/125 µm

single mode ber (SMF)

• Multisourced 2 x 5 package style with LC receptacle

• Single +3.3 V power supply

• Temperaturerange:

AFCT-5943LZ: 0°C to +70°C

AFCT-5943ALZ: -40°C to +85°C

• Wave solder and aqueous wash process compatible

• Manufactured in an ISO9002 certied facility

• RoHS compliant

• Fully Class 1 CDRH/IEC 825 compliant

• Compliant with ITU-T G.957, STM-16, I-16 and S-16.1

Optical Interfaces

• AFCT-5943LZ/ALZ: with EMI shield

• Receiver output squelch function enabled

Applications

• SONET/SDH equipment interconnect

• Multirate Client Interface on Metro Gateways and

Edge Switches

Functional Description

Receiver Section

Design

The receiver section for the AFCT-5943xxZ contains an

InGaAs/InP photo detector and a preamplier mounted

in an optical subassembly. This optical subassembly

is coupled to a postamp/decision circuit on a circuit

board. The design of the optical assembly is such that it

provides better than 27 dB Optical Return Loss (ORL).

The postamplier is ac coupled to the preamplier as

illustrated in Figure 1. The coupling capacitors are large

enough to pass the SONET/SDH test pattern at 155 Mb/

s, 622 Mb/s and 2488 Mb/s without signicant distor-

tion or performance penalty. For multirate applications

the sensitivity will meet the maximum SONET specica-

tion for OC48 across all datarates (-19 dBm), also for DC

balanced codes, e.g. 8B/10B. For codes which have a

signicantly lower frequency content, jitter and pulse

distortion could be degraded.

The receiver outputs are squelched at Signal Detect

deasserts. That is, when the light input decreases to

typical -27 dBm or less, the Signal Detect deasserts i.e.

the SD Output goes to a PECL low state. This forces the

DATA OUT and DATA OUT Bar to go PECL levels high

and low respectively.

Figure 1 also shows a lter function which limits the

bandwidth of the preamp output signal. The lter is de-

signed to bandlimit the preamp output noise and thus

improve the receiver sensitivity.

These components will reduce the sensitivity of the re-

ceiver as the signal bit rate is increased above 2.7 Gb/s.

Noise Immunity

The receiver includes internal circuit components to

lter power supply noise. However under some condi-

tions of EMI and power supply noise, external power

supply ltering may be necessary (see Application Sec-

tion).

The Signal Detect Circuit

The signal detect circuit works by sensing the peak level

of the received signal and comparing this level to a ref-

erence. The SD output is low voltage TTL.

Figure 1. Receiver Block Diagram

TRANS-

IMPEDANCE

PRE-

AMPLIFIER

FILTER

GND

AMPLIFIER

PECL

OUTPUT

BUFFER

TTL

OUTPUT

BUFFER

DATA OUT

SIGNAL

DETECT

CIRCUIT

DATA OUT

Figure 2. Simplied Transmitter Schematic

DATA

PECL

INPUT

LASER

MODULATOR

LASER

BIAS

DRIVER

LASER

BIAS

CONTROL

PHOTODIODE

(rear facet monitor)

Functional Description

Transmitter Section

Design

A schematic diagram for the transmitter is shown in

Figure 2. The AFCT-5943LZ/ALZ incorporates an FP laser

and has been designed to be compliant with IEC 825

eye safety requirements under any single fault condi-

tion and CDRH under normal operating conditions. The

optical output is controlled by a custom IC that detects

the laser output via the monitor photodiode. This IC

provides both dc and ac current drive to the laser to en-

sure correct modulation, eye diagram and extinction ra-

tio over temperature, supply voltage and operating life.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15

AFCT-5943LZ

Mfr. #:

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Fiber Optic Transmitters, Receivers, Transceivers Transceive

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AFCT-5943LZ

AFCT-5943LZ

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