AFCT-5961ATLZ Avago Technologies US Inc., AFCT-5961ATLZ Datasheet - Page 2

• Manufacturer Part Number: AFCT-5961ATLZ
• Description: TXRX OPT SM SONET OC3/SDH 2X5
• Manufacturer: Avago Technologies US Inc.
• Series: METRAKr

Specifications of AFCT-5961ATLZ

• Applications: General Purpose
• Connector Type: LC Duplex
• Data Rate: 155Mbps
• Wavelength: 1300nm
• Voltage - Supply: 3.1 V ~ 3.5 V
• Mounting Type: Through Hole
• Data Rate Max: 0.155Gbps
• Supply Voltage: 3.3V
• Wavelength Typ: 1300nm
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Functional Description
Receiver Section
Design
The receiver section for the AFCT-5961TLZ/TGZ/ATLZ/
ATGZ/NLZ/NGZ contains an InGaAs/InP photo detector
and a preamplifier mounted in an optical subassem-
bly. 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 14
dB Optical Return Loss (ORL).
The postamplifier is ac coupled to the preamplifier as il-
lustrated in Figure 1. The coupling capacitors are large
enough to pass the SONET/SDH test pattern at 155 Mb/
s without significant distortion or performance penalty.
If a lower signal rate, or a code which has significantly
more low frequency content is used, sensitivity, jitter
and pulse distortion could be degraded.
Figure 1 also shows a filter function which limits the
bandwidth of the preamp output signal. The filter is
Figure 1. Receiver Block Diagram
2
PHOTODETECTOR
BIAS
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
GND
FILTER
AMPLIFIER
CIRCUIT
SIGNAL
DETECT
designed to bandlimit the preamp output noise and
thus improve the receiver sensitivity.
These components will reduce the sensitivity of the
receiver as the signal bit rate is increased above 155
Mb/s.
Noise Immunity
The receiver includes internal circuit components to
filter power supply noise. However under some condi-
tions of EMI and power supply noise, external power
supply filtering may be necessary (see Application
Section).
The Signal Detect Circuit
The signal detect circuit works by sensing the level
of the received signal and comparing this level to a
LVPECL
OUTPUT
BUFFER
LVPECL
OUTPUT
BUFFER
DATA OUT
DATA OUT
SD