Operator’s Manual
5
OMA System Architecture
A modulated optical signal is input to the coherent receiver along with a Local Oscillator (LO). The
coherent receiver also outputs a laser which can be used as a source for the LO. The output LO can be
controlled from the coherent receiver’s LCD interface as well as from the OMA software.
The coherent receiver converts the optical input into four electrical signals labeled XI, XQ, YI, and YQ
which are then input to the LabMaster acquisition module.
The Analogue-to-Digital Converters (ADCs) in the LabMaster perform the front-end sampling and present
this data to the OpticalLinQ OMA software for analysis:
•
The first step in this process is receiver calibration and correction, which must be performed every
time an acquisition session is to be started.
•
The next stage in the process is a set of Digital Signal Processing (DSP) algorithms which form
the core of the OMA functionality. The DSP operates in three stages: Dispersion Compensation,
Polarization De-multiplexing and Carrier
Recovery
.
Details of these operations will be provided
later in the document.
The output of the DSP kernel is fed to the various visualizers such as
Constellations
,
Trajectories
,
Eye Diagrams and Masks.
In addition to this, a range of measurements are also provided for complete signal characterization.
Summary of Contents for IQS25
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