In today’s digitalized world, the demand for data transmission continues to grow, pushing network capacities to their limits. While coherent transceivers effectively meet user demands in long-haul transmissions, new solutions are required for metro access networks. This challenge arises due to the different detection technologies used in metroaccess passive optical networks (PONs), specifically Intensity Modulation Direct- Detection (IMDD). From a capacity perspective, IMDD is significantly limited compared to coherent detection, as it does not support advanced modulation formats that provide higher spectral efficiency. On the other hand, implementing coherent transmission is more complex and costly, making it unsuitable for the PON context.