The APEX Technologies Optical Spectrum Analyzers clearly show much more details than the grating based OSA and leaves any kind of guess work behind.
Two Optical Spectrum Analyzers channels, one per polarization axis !
The input signal is split into two orthogonal polarization axes, analysed simultaneously by two internal independent channels, APEX Technologies Optical Spectrum Analyzer has the unique advantage to display the two polarization channels separetely and simultaneously. It can also recombine them and display a polarization independent measurement.
Optical spectrum analyzers can display the two polarization channels separetely and simultaneously