Open AccessMiteq DR-125G-A, 12-GHZ Fiber-Optic Detector Evaluations for Photonic Doppler Velocimetry Diagnostic
Author(s) -
Araceli Rutkowski,
Michael Rutkowski
Publication year - 2007
Language(s) - English
Resource type - Reports
DOI - 10.2172/917717
Subject(s) - laser linewidth , detector , optics , laser , photonics , laser doppler velocimetry , optical power , velocimetry , doppler effect , optical fiber , physics , materials science , optoelectronics , medicine , blood flow , astronomy
The 12.5-GHz bandwidth MITEQ DR-125G-A detector is used often in the photonic Doppler velocimetry (PDV) diagnostic of Los Alamos National Laboratory (LANL). This paper presents detector characteristics as applied to optical heterodyning. We propose a test setup to simulate the beat frequency generated when incident and reflected light from a moving surface are mixed by optically combining a small-linewidth, tunable laser with a fixed, 1550-nm, thin-linewidth, high-power laser. The detector's transfer function, harmonic content, and signal-to-noise ratio (SNR) were to be measured and plotted for different optical power levels. Based on these results, appropriate light levels can be set to produce the highest dynamic range and signal level for the beat frequency. The goal is to provide insight into setting up the diagnostic for optimal detector performance using a specific optical input power