Rotary traveling wave oscillators (RTWO) are designed to provide a high frequency clock signal through the silicon interposer to multiple chiplets in a heterogeneous 2.5D system. In particular, two different RTWO synchronization topologies are presented 1) active interposer RTWO and 2) passive interposer RTWO. The proposed topologies are evaluated across a silicon interposer dimension of 42mm  20mm. Each topology is implemented with post-layout, parasitic extracted models for a clock frequency of approx. 8GHz. The proposed topologies are investigated for clock period, skew, rise time, fall time, and oscillation start-up + settling times across the multi-die system (MDS) with SPICE based simulations.