Laser Scan Analyzer

Data Acquisition Example Using LSA-200A

We use single-channel LSA-200A module as an example to show how to build your measurement system. The function diagram is shown in Figure 2 below, GouMax data acquisition and analysis system consists of a sweeping tunable laser, an LSA-200A module and a personal computer. The computer controls the tunable laser for its wavelength sweeping from a “Start” wavelength to a “Stop” wavelength at a specified sweep speed. When the laser sweeps at the “Start” wavelength, a trigger signal is sent to LSA-200A for synchronizing data acquisition. As the laser source scans the wavelength, the light-detection units sample the light level passing through the DUT (Device Under Test), synchronized with the wavelength clock of the tunable laser source. At the same time, internal power detector unit and real-time wavelength meter measure reference power and wavelength. Within sub-second, the full spectra of the DUTs are acquired. Based on the spectra, one can derive the critical parameters of the DUT, such as bandwidth at different levels, insertion loss, central wavelength and isolation, etc.

Figure : Function diagram of LSA-200A module

To fulfill many varieties of customer’s applications, LSA-200 provides Dynamic Link Library (DLL) that allows users to build their own control software while dynamically accessing acquisition data. Computer controls and exchanges with LSA-200 modules through DLL.