Fibertek, Inc. and Univ. of Maryland, Baltimore County (UMBC) propose to optimize and verify, an advanced platform for direct-detection lidar transmitter, based on using a dual-wavelength fiber-lidar transmitter. The proposed lidar tramsitter is based on a recently developed fiber lidar platform at Fibertek, that is capable of high spectral resolution at both 1064nm/532nm, has flexible pulse capability from sub-nsec to micro-seconds, with arbitrary optical waveform generation. This will be integrated in the lidar measurement system at UMBC, and lidar calibration, validation, and performance analysis will be conducted under different atmoshperic aerosol loading conditions. Such measurements will also be compared to co-located measurements conducted via the ELF and MPLNET lidar systems.