afct-5942tltgz Avago Technologies, afct-5942tltgz Datasheet - Page 3

• Manufacturer Part Number: afct-5942tltgz
• Description: Single Mode Sff Transceivers For Sonet Oc-48/sdh Stm-16 Singlerate Operation Part Of The Avago Technologies? Metrak Family
• Manufacturer: Avago Technologies

Figure 2. Simplified Transmitter Schematic
3
Functional Description
Transmitter Section
Design
A schematic diagram for the transmitter is shown in
Figure 2. The AFCT-5942LZ/ALZ/GZ/AGZ incorporates an
FP laser as its laser source. and the AFCT-5942TLZ/TGZ/
ATLZ/ATGZ uses a DFB laser as its laser source. Both pack-
ages have 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 pro-
vides 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.
The transmitters also include monitor circuitry for both
the laser diode bias current and laser diode optical
power.
B
B
P
P
DATA
DATA
MON
MON
MON
MON
(+)
(-)
(+)
(-)
INPUT
PECL
MODULATOR
LASER
LASER BIAS
LASER BIAS
CONTROL
DRIVER
LASER
FP or
DFB
(rear facet monitor)
PHOTODIODE