The RS6360 Optical Spectrum Analyzer, a new high performance spectrum analyzer, is developed through adopting the global advanced technologies Passive Component Test Application such as double-pass grating monochromator, high resolution direct drive diffraction grating, optical cuneiform delay polarization elimination and electronic digital filter. Having reached the advanced level of its global counterpart on the whole, the analyzer is used in the test of basic components such as LED, LD, SLD, DFB-LD, EDFA, optical fiber, optical fiber grating, optical filter, optical magnifier, WDM, and related systems.