Data Sheet
October 2001
3970-Type 1550 nm Transmitter
Description
The 3970-type, externally modulated 1550 nm trans-
mitter provides CATV systems integrators one of the
fastest and easiest paths to customer value-added,
high-performance solutions.
The 1550 nm transmitter engine incorporates a
source laser optimized to improve transmitter and link
performance with high specifications and better sig-
nal quality. This advantage drives superior control of
RIN through fiber and management of dispersion,
stimulated brillouin scattering, and self-phase modu-
lation for better noise and distortion performance
over long-distance applications.
Features
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Extremely fast time to market and very low engi-
neering investment
Superior CNR, CSO, and CTB performance on two
high-power optical outputs
Mobile field-tuning application provides real-time
performance optimization
High SBS suppression capabilities enhance archi-
tectural options and coverage
Multiple programmable tuning optimizations per
transmitter facilitate inventory management and
performance across architectures
The transmitter embedded system software also pro-
vides the ability to load and store multiple configura-
tions of the transmitter tuning parameters. In this way,
a single transmitter can be optimized for more than
one set of link characteristics. This feature simplifies
inventory and reduces multiple device management.
The software controls, monitors, generates/pro-
cesses alarms, and handles faults for transmitter
subsystems. The system software also accommo-
dates three interfaces for two-way communication
with the transmitter. A two-line front panel user inter-
face provides system status and telemetry, and
accepts user commands. Fine tuning can be accom-
plished in the field through an RS-232 serial inter-
face. System software upgrades can be downloaded
on-the-fly into the transmitter via this interface. A
well-defined API at the RS-485 network interface will
enable custom applications and network manage-
ment systems to communicate with and control the
transmitter.
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Applications
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High-performance supertrunking links
High-launch power distribution networks
Redundant analog ring architectures
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