The Pacific Ocean Neutrino Experiment (P-ONE) is a very-large-volume neutrino telescope proposed for deployment deep in the northern Pacific Ocean off the coast of British Columbia, Canada. Successful deployment of P-ONE will expand the observable skyline and increase the global detection rate of extraterrestrial neutrinos, expanding our understanding of their energetic sources across the cosmos. The detector will consist of an array of mooring lines instrumented with Precision Optical Modules (P-OMs) which detect Cherenkov light from secondary particles produced in neutrino interactions within the detector volume. For successfully reconstructing incident neutrinos, both the optical properties of seawater and the positions of each P-OM within the detector must be known to high precision. To achieve this goal, P-ONE will be designed to include a variety of calibration light sources for both localized and ranged measurements within the detector. These sources include unique P-ONE calibration modules (P-CALs) which are a combination of the detection elements of the P-OM with a well calibrated nanosecond flasher and small fast light flashers integrated into each P-OM for local calibration. This contribution highlights the current status of optical calibration light source development from initial simulations to results from lab tests of integrated flasher properties.