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 in one equipment !
Optionally, two additional PM inputs directly connected to each internal channels are available. With these 2 additional PM inputs, two independent signals can be analysed simultaneously.
By using this option, the equipment can be used as two Optical Spectrum Analyzers !