AFCT-5964TLZ/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
-5
AFCT
964T
LZ
Description
The AFCT-5964TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ are high
performance, cost effective modules for serial optical data
communications applications specified for a signal rate of
155 Mb/s. They are designed to provide SONET/SDH
compliant intermediate and long reach links at 155 Mb/s.
All modules are designed for single mode fiber and ope-
rate at a nominal wavelength of 1300 nm. They incorpo-
rate high performance, reliable, long wavelength optical
devices and proven circuit technology to give long life
and consistent service.
The transmitter section of the AFCT-5964TLZ/TGZ/ATLZ/
ATGZ/NLZ/NGZ incorporates a 1300 nm Fabry Perot (FP)
laser.
The transmitter has full IEC 825 and CDRH Class 1 eye
safety.
The receiver section uses an MOVPE grown planar
PIN photodetector for low dark current and excellent
responsivity.
These transceivers are supplied in the new industry
standard 2 x 10 DIP style package with the LC fiber
connector interface and is footprint compatible with SFF
Multi Source Agreement (MSA).
Features
RoHS Compliant
AFCT-5964TLZ/ATLZ: Links of 15 km with 9/125
m
single mode fiber (S1.1)
AFCT-5964NLZ: Links of 40 km with 9/125
m
single
mode fiber (L1.1)
Multisourced 2 x 10 package style with LC receptacle
Single +3.3 V power supply
Temperature range:
– AFCT-5964TLZ: 0° C to +70° C,
– AFCT-5964ATLZ: -40° C to +85° C,
– AFCT-5964NLZ: -5° C to +70° C,
Wave solder and aqueous wash process compatible
Manufactured in an ISO9002 certified facility
Fully Class 1 CDRH/IEC 825 compliant
+3.3 V TTL signal detect output
Transceivers are available with and without EMI nose
shield (see ordering information details)
Applications
SONET/SDH equipment interconnect, OC-3/SDH STM-1
rate
Long and intermediate reach ATM/SONET links
Suitable for Fast Ethernet Applications
Functional Description
Receiver Section
Design
The receiver section for the AFCT-5964TLZ/TGZ/ATLZ/
ATGZ/NLZ/NGZ contains an InGaAs/InP photo detector
and a preamplifier 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 14 dB
Optical Return Loss (ORL).
The postamplifier is ac coupled to the preamplifier as
illustrated 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 band-
width of the preamp output signal. The filter is designed
to bandlimit the preamp output noise and thus improve
the receiver sensitivity.
PHOTODETECTOR
BIAS
These components will reduce the sensitivity of the
receiver as the signal bit rate is increased above 155 Mb/s.
The device incorporates a photodetector bias circuit. This
output must be connected to V
CC
and can be monitored
by connecting through a series resistor (see Application
Section).
Noise Immunity
The receiver includes internal circuit components to filter
power supply noise. However under some conditions
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 reference.
The SD output is +3.3 V TTL.
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
FILTER
AMPLIFIER
LVPECL
OUTPUT
BUFFER
DATA OUT
DATA OUT
GND
SIGNAL
DETECT
CIRCUIT
LVTTL
OUTPUT
BUFFER
SD
Figure 1. Receiver Block Diagram
2
Functional Description
Transmitter Section
Design
A schematic diagram for the transmitter is shown in Figure
2. The AFCT-5964TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ incorpo-
rates an FP laser as its optical source. All part numbers
have been designed to be compliant with IEC 825 eye
safety requirements under any single fault condition and
CDRH under normal operating conditions. The optical
output is controlled by a custom IC that detects the laser
FP
LASER
DATA
DATA
LVPECL
INPUT
LASER
MODULATOR
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 tem-
perature, supply voltage and operating life.
The transmitter also includes monitor circuitry for both
the laser diode bias current and laser diode optical power.
PHOTODIODE
(rear facet monitor)
B
MON
(+)
B
MON
(-)
LASER BIAS
DRIVER
P
MON
(+)
P
MON
(-)
Figure 2. Simplified Transmitter Schematic
LASER BIAS
CONTROL
3
Package
The overall package concept for these devices consists of
the following basic elements; two optical subassemblies,
a electrical subassembly and the housing as illustrated in
the block diagram in Figure 3.
The package outline drawing and pin out are shown in
Figures 4 and 5. The details of this package outline and
pin out are compliant with the multisource definition of
the 2 x 10 DIP. The low profile of the Avago Technologies
transceiver design complies with the maximum height
allowed for the LC connector over the entire length of the
package.
The electrical subassembly consists of high volume multi-
layer printed circuit board on which the IC and various
surface-mounted passive circuit elements are attached.
The optical subassemblies are attached to the electrical
subassembly. These two units are then fitted within the
outer housing of the transceiver. The housing is then
encased with a metal EMI protective shield.
The electrical subassembly carries the signal pins that exit
from the bottom of the transceiver. The solder posts are
designed to provide the mechanical strength required to
withstand the loads imposed on the transceiver by mating
with the LC connectored fiber cables. Although they are
not connected electrically to the transceiver, it is recom-
mended to connect them to chassis ground.
R
X
SUPPLY
NOTE
DATA OUT
QUANTIZER IC
DATA OUT
SIGNAL DETECT
T
X
GROUND
DATA IN
DATA IN
Tx DISABLE
LASER BIAS
MONITORING
LASER DRIVER
AND CONTROL
CIRCUIT
LASER DIODE
MODULATOR
LASER
OPTICAL
SUBASSEMBLY
R
X
GROUND
LC
RECEPTACLE
PIN PHOTODIODE
PREAMPLIFIER
SUBASSEMBLY
T
X
SUPPLY
CASE
Note: Nose clip provides connection to chassis ground for both EMI and Thermal Dissipation.
Figure 3. Block Diagram
4
[0.598]
15.2
MAX
[0.528
±0.008
]
13.4
±0.2
[0.533]
13.6
MAX
TOP VIEW
[0.244]
6.2
[0.402]
10.2
MAX
[0.126
±0.006
]
3.20
±0.15
[0.042
±0.004
]
Ø 1.1
±0.1
[0.776
±0.012
]
19.7
±0.3
[1.929
±0.008
]
49
±0.2
[0.386]
9.8
MAX
[0.400
±0.004
]
10.16
±0.1
[0.370
±0.008
]
9.4
±0.2
Ø 0.5
±0.2
[0.070
±0.004
]
1.8
±0.1
[0.118
±0.004
]
3
±0.1
FRONT VIEW
SIDE VIEW
BACK VIEW
G MODULE − NO EMI SHIELD
SIDE VIEW
BOTTOM VIEW
Dimensions in millimeters (inches)
Dimensions shown are nominal. All dimensions meet the maximum package outline drawing in the SFF MSA.
Figure 4. AFCT-5964TLZ/TGZ/ATLZ/ATGZ/NLZ/NGZ Package Outline Drawing
5
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