AFCT-5961TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ
Single Mode Laser Small Form Factor Transceivers
for ATM, SONET OC-3/SDH STM-1
Part of the Avago Technologies METRAK family
Data Sheet
Description Features
The AFCT-5961TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ are high
RoHS compliant
performance, cost effective modules for serial optical
AFCT-5961TLZ/ATLZ
data communications applications specified for a signal
Links of 15 km with 9/125 m single mode fiber
rate of 155 Mb/s. They are designed to provide SONET/
(S1.1)
SDH compliant intermediate and long reach links at 155
AFCT-5961NLZ
Mb/s.
Links of 40 km with 9/125 m single mode fiber
All modules are designed for single mode bfi er and
(L1.1)
operate at a nominal wavelength of 1300 nm. They in-
Multisourced 2 x 5 package style with LC receptacle
corporate high performance, reliable, long wavelength
optical devices and proven circuit technology to give
Single +3.3 V power supply
long life and consistent service.
Temperature range:
AFCT-5961TLZ: 0 C to +70 C
The transmitter section of the AFCT-5961TLZ/TGZ/
AFCT-5961ATLZ: -40 C to +85 C,
ATLZ/ATGZ/NLZ/NGZ incorporates a 1300 nm Fabry
AFCT-5961NLZ: -5 C to +70 C
Perot (FP) laser. The transmitter has full IEC 825 and
CDRH Class 1 eye safety.
Wave solder and aqueous wash process compatible
The receiver section uses an MOVPE grown planar PIN
Manufactured in an ISO9002 certified facility
photodetector for low dark current and excellent re-
Fully Class 1 CDRH/IEC 825 compliant
sponsivity.
LVPECL compatible signal detect output
A pseudo-ECL compatible logic interface simplifies
Transceivers are available with and without EMI nose
interface to external circuitry.
shield (see ordering information details)
These transceivers are supplied in the new industry
standard 2 x 5 DIP style package with the LC fiber
Applications
connector interface and is footprint compatible with
SFF Multi Source Agreement (MSA). SONET/SDH equipment interconnect,
OC-3/SDH STM-1 rate
Long and intermediate reach ATM/SONET links
Suitable for Fast Ethernet Applications.FunctionalDescription
Receiver Section
Design
designed to bandlimit the preamp output noise and
The receiver section for the AFCT-5961TLZ/TGZ/ATLZ/
thus improve the receiver sensitivity.
ATGZ/NLZ/NGZ contains an InGaAs/InP photo detector
and a preamplifier mounted in an optical subassem -
These components will reduce the sensitivity of the
bly. This optical subassembly is coupled to a postamp/
receiver as the signal bit rate is increased above 155
decision circuit on a circuit board. The design of the
Mb/s.
optical assembly is such that it provides better than 14
dB Optical Return Loss (ORL).
NoiseImmunit y
The postampliefi r is ac coupled to the preamplifier as il -
The receiver includes internal circuit components to
lustrated in Figure 1. The coupling capacitors are large
filter power supply noise. However under some condi -
enough to pass the SONET/SDH test pattern at 155 Mb/
tions of EMI and power supply noise, external power
s without significant distortion or performance penalty.
supply filtering may be necessary (see Application
If a lower signal rate, or a code which has significantly
Section).
more low frequency content is used, sensitivity, jitter
TheS ignal Detect Circuit
and pulse distortion could be degraded.
The signal detect circuit works by sensing the level
Figure 1 also shows a filter function which limits the
of the received signal and comparing this level to a
bandwidth of the preamp output signal. The filter is
PHOTODETECTOR
BIAS
DATA OUT
FILTER
TRANS-
LVPECL
IMPEDANCE
OUTPUT
AMPLIFIER
PRE-
BUFFER
AMPLIFIER
DATA OUT
GND
LVPECL
SIGNAL
SD
OUTPUT
DETECT
BUFFER
CIRCUIT
Figure1. R eceiverBlock D iagram
2