Sample Light Source Detector  Scan through spectrum  Only one wavelength on at a time  Spectral encoding in time Time Division Multiplexing: Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

Sample Light Source FFT Detector  All wavelengths on all the time  Spectral encoding in frequency  Wavelengths modulated with unique frequency  Demodulation with FFT or Lock-In Amplifier Frequency Division Multiplexing: Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements

 Implementation of a general TDM and FDM system in LabVIEW  Modular coding of noise sources  Noise library  Detector library  Comparison of TDM and FDM performance  Same conditions (#wavelengths, wavelengths, avg. power, measurement time, linewidths, absorption levels, hardware)  Minimal detectable absorbance (MDA)  Differences in noise levels  Tracking of dynamic events In this project: Noise Analysis in TDM vs. FDM Absorption Spectroscopy Measurements