The resolution is controlled by 3 factors:
The resolution setting controls the output slit disk. This disk has a fixed number of slits in it. Since the setting only control one of the factors that determines the resolution, and the disk has a fixed number of slits, the set value may not always be the actual resolution. Keep in mind the OSA does calculate actual resolution and displays it on the soft key where you select the resolution you want. Also note that sometimes the actual resolution is better than the selected and sometimes it is not. Please view the atached PowerPoint slides that explain how the OSA resolution works.
Yokogawa's AQ6370 Optical Spectrum Analyzer is Re-defining Optical Spectrum Measurement Excellence!
High performance with a 20 picometer wavelength resolution supporting 25 GHz DWDM spacing and 40G/100G applications, this OSA also supports non-Telecom applications with a wavelength range from 600nm to 1700nm.
Unique LONG wavelength range of 1200 to 2400 nm makes this the world's first and only OSA specifically designed for use in advance applications such as Carbon Monoxide (CO), Carbon Dioxide (CO2) gas detection and LIDAR.
Dedicated SHORT wavelength Range of 350nm to1200nm allows this model to accurately measure the visible spectrum of 380nm to 780nm for bio-sciences and beyond. It is also a popular tool for measuring 1064nm Nd:YAG, DPSS Laser sources.
An Optical Spectrum Analyzer (or OSA) is a precision instrument designed to measure and display the distribution of power of an optical source over a specified wavelength span. An OSA trace displays power in the vertical scale and the wavelength in the horizontal scale.
Optical test equipment or optical measuring instruments are used to measure and characterize the physical properties of light.