The AP2045B from Apex Technologies is a Optical Spectrum Analyzer with Wavelength Range 1265 to 1345 nm, Wavelength Resolution 1.12 pm to 1.6 nm@140 MHz to 100 GHz, Wavelength Accuracy ± 2 to ±3 pm, Dynamic Range 79 dB, Sweep Time 1 sec for 18 nm. More details for AP2045B can be seen below.