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The GX2-LM1000E series is a line of high-performance 1310 nm DFB laser transmitter
modules for the OmniStar
®
GX2 optical broadband transmission platform.
Module Features
The modules are designed for ease of use. The optical output connector is located on the
front of the module for easy cleaning and installation. The standard connector type is an
SC/APC; an E2000 connector is available as an option. The dual fans on each module are
field-replaceable, and the fan current is monitored to provide operational status.
Transmitter setup and link proofing are quick and easy. The modules are preset at the fac-
tory for optimal performance immediately on power-up. Targeted services can be easily
added using the separate high-isolation narrowcast RF input. Two front-panel RF test
points provide convenient verification of signal inputs. One test point directly monitors the
main RF input, while the other test point monitors the RF drive into the laser. Firmware is
downloadable and can be upgraded while the module remains in operation. No hardware
changes are needed. The CW/Video modes allow a link to be set up and proofed using a
CW source. When modulated signals, which have a lower average power level than CW
carriers, are applied, the microprocessor adjusts the RF drive level into the laser to match
the CW drive levels based on the operator-selected video offset. Several offset settings
are provided to match different system needs. This feature ensures that the laser is not
operating in clipping when modulated signals are applied, providing operators with a
reliable and accurate way to proof links.
Three gain modes offer greater design flexibility:
• Preset—Automatic Gain Control using factory settings for optimal laser performance
• Set—Automatic Gain Control to an RF level adjusted by the operator to optimize noise
and distortion performance based on channel loading and system requirements
• Manual—Fixed Gain to an RF level adjusted by the operator to optimize noise and
distortion performance based on channel loading and system requirements
Intelligence
The PowerPC microprocessor, the heart of every LM1000E series transmitter module,
offers sophisticated control functions along with high integration. This single-chip design
contains flash memory, random access memory, and analog/digital converters.
Manufacturing test data and all module-specific information (e.g., firmware, menu
structure, etc.) are stored in the nonvolatile memory.
Communications
Several methods are available for real-time system monitoring and control. A tri-colored
LED on each module indicates general operating status. The optional shelf door unit with
display provides monitoring and control with an alphanumeric display and simple push-but-
ton navigation. In addition, a PC interface is available through an Ethernet port on the front
of the control module. Using a standard Web browser, the graphical user interface
provides a point-and-click method for configuring the shelf. For higher-level management,
the OmniStar GX2 can be easily connected to a remote network management system
using a standard Ethernet SNMP interface.
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