The fluid flow field of a supersonic jet from a converging-diverging nozzle with fluid inserts is studied in an experimental investigation. The Pennsylvania State University has developed a noise reduction method that uses corrugations or rows of fluid inserts in the diverging section of the nozzle. Far-field pressure measurements have successfully shown up to a 5 dB noise reduction in the peak noise direction. The current study utilizes Particle Image Velocimetry (PIV) to observe the near-field velocities directly at the exit plane of the nozzle. The flow field is analyzed and compared for various fluid insert configurations. The velocity field demonstrates the effect of the fluid inserts on the core flow of the jet. It is observed that the fluid inserts increase the width of the shear layer. A filtered Proper orthogonal decomposition (POD) method is discussed in the analysis of the flow field. The flow field results are compared to far-field measurements to better understand the mechanisms that produce noise reduction.