In the past two decades, wireless communications have attracted vast popularity in which Radio Frequency (RF) and Optical Wireless Communication (OWC) have been applied for transferring of data. OWC has the potential to be an alternative to RF and fiber optic communication systems. Wavelength Division Multiplexing (WDM) technique can be easily integrated with indoor OWC systems, where it can significantly increase the bitrate. This paper describes reviews of the current state of the art indoor WDM-based OWC systems, where the challenges of these systems are investigated. Finally, this paper proposes solitonic pulse shape for indoor WDM-based OWC using Micro Ring Resonators (MRR) to overcome these problems. Here, a PANDA ring resonator can be connected to an add/drop filter system in order to obtain desired results of picosecond pulses. The results show generation of ultra-short 23 picosecond solitonic pulses which can be used to improve the WDM-based OWC systems.