The APEX Technologies Optical Spectrum Analyzers clearly show much more details than the grating based OSA and leaves any kind of guess work behind.
Perfect resolution filters for OSNR measurement !
Several resolution filters between 250 GHz and 5 MHz are available. APEX Technologies rectangular shape resolution filters allow a nearly perfect integration of the signal over the selected resolution, while a grating based Optical Spectrum Analyzer filter integrate inside a wide base triangular shape.
This sharp integration allows our OSA to perform a much more realistic level measurement, essential for an accurate OSNR measurement.