PGT 602 04
Transmitter Module
for STM-4 LH/OC-12 LR
Key Features
• Average power control
• Single 5.0 V supply
• Small size (40x70x9 mm)
• CMOS alarm output
• Clocked or non-clocked reshape
• TEC included
• P-ECL data input
• Tone modulation input
• External wavelength tuning
Applications
• Long Haul WDM SDH STM-4 systems
• Long Reach WDM SONET OC-12
systems
• Datacommunication applications
• Telecommunication applications
Description
The transmitter module is intended for use at SDH and SONET bit rates. The
device meets all present requirements in the ITU-T (G.957, G.958) and
Bellcore (GR-253-CORE) recommendations.
The single silicon IC is used as a laser driver, modulator and automatic power
control. To ensure a proper laser operation over the wide temperature range
and life of operation the average optical output power is controlled. The laser
bias is externally accessible for monitoring of the performance. A power
alarm is activated when the average optical power cannot be maintained
within specification. A laser shut-down is also provided according to SDH/
SONET requirements.
To provide a constant operating operating temperature for the laser, a
thermoelectric cooler is included. The drive circuitry for the cooler is espe-
cially designed to minimize power consumption and allows a very compact
product.
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ERICSSON [ ERICSSON ]
