The influence of the distribution element position in PONs is reported. Best Crosstalk-to-Signal ratio (C/S) is achieved if it is placed either in the ONU or OLT vicinity with optimum ONU gain depending of the MUX position
López, E. T. [et al.]. ONU optimal gain and position of the distribution element in Rayleigh-limited WDM and TDM PONs with reflective ONU. A: European Conference on Optical Communication. "ECOC'09: 35th European Conference on Optical Communication, 2009: 20-24 Sept. 2009, Vienna, Austria". Vienna: Institute of Electrical and Electronics Engineers (IEEE), 2012, p. 1-2.