AFCT-5745TPZ Avago Technologies US Inc., AFCT-5745TPZ Datasheet - Page 2

• Manufacturer Part Number: AFCT-5745TPZ
• Description: Fiber Optic Transceiver,MODULE
• Manufacturer: Avago Technologies US Inc.
• Series: METRAKr

Specifications of AFCT-5745TPZ

• Data Rate: 2.7Gbps
• Wavelength: 1300nm
• Applications: General Purpose
• Voltage - Supply: 3.1 V ~ 3.5 V
• Connector Type: LC Duplex
• Mounting Type: SFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
Receiver Section Design
The receiver section for the AFCT-5745Z contains an
InGaAs/InP photo detector and a preamplifier mounted
in an optical subassembly. This optical subassembly is
coupled to a postamplifier/decision circuit on a circuit
board. The postamplifier is ac coupled to the preamplifier.
The coupling capacitors are chosen to pass the SONET/
SDH test pattern at 155 Mb/s, 622 Mb/s and 2.488 Gb/s
without significant distortion or performance penalty.
For multirate applications the sensitivity will meet the
maximum SONET specification for OC48 across all da-
tarates (-19dBm) for 2
dc balanced codes, e.g. 8B/10B. For codes that have a
significantly lower frequency content, jitter and pulse
distortion could be degraded.
Loss of Signal
The Loss of Signal (LOS) output indicates that the optical
input signal to the receiver does not meet the minimum
detectable level for compliant signals. When LOS is high
it indicates loss of signal. When LOS is low it indicates
normal operation. The Loss of Signal thresholds are set
to indicate a definite optical fault has occurred (eg., dis-
connected or broken fiber connection to receiver, failed
transmitter).
Transmitter Section Design
A schematic diagram for the transmitter is shown in Fig-
ure 1. The AFCT-5745xPZ incorporates an FP laser as its
optical source, the AFCT-5745xTPZ incorporates an DFB
laser as its optical source. All part numbers have been
designed to be compliant with IEC 825 and CDRH eye
safety requirements. 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 ensure correct modulation, eye diagram
and extinction ratio over temperature, supply voltage
and operating life.
2
23
-1 PRBS patterns as well as for
TX_FAULT
The AFCT-5745Z modules feature a transmit fault control
signal output which when high indicates a laser transmit
fault has occurred and when low indicates normal laser
operation. A transmitter fault condition can be caused
by deviations from the recommended module operating
conditions or by violation of eye safety conditions. A fault
is cleared by cycling the TX_DISABLE control input.
TX_DISABLE
The AFCT-5745Z accepts a transmit disable control signal
input which shuts down the transmitter. A high signal
implements this function while a low signal allows nor-
mal laser operation. In the event of a fault (eg., eye safety
circuit activated), cycling this control signal resets the
module. The TX_DISABLE control should be actuated
upon initialization of the module.
Digital Diagnostic Interface and Serial Identification
(EEPROM)
The AFCT-5745Z complies with both SFF-8074i (SFP) and
SFF-8472 (Digital Diagnostic SFP) specifications available
from the SFF Committee at http://www.sffcommittee.org.
The AFCT-5745Z adds digital diagnostic monitoring to
standard SFP functionality, enabling failure prediction,
fault islolation, and component monitoring capabilities.
The transceiver continues to use the 2-wire I
ible serial interface. Standard SFP EEPROM bytes 0-255
are addressed per SFF-8074i at memory address 0xA0
(A0h). New digital diagnostic information is accessed per
SFF-8472 using EEPROM bytes 0-255 at memory address
0xA2 (A2h).
The AFCT-5745Z provides real time access to transceiver
internal supply voltage and temperature, transmitter
output power, laser bias current and receiver average
input power, allowing a host to predict system compli-
ance issues.
These 5 parameters are reported “internally” calibrated as
described in SFF-8472.
2
C compat-