Ultralow-crosstalk, strictly non-blocking microring-based optical switch

A Silicon Photonic Switching Platform for Flexible Converged Centralized-Radio Access Networking

“…2(a). This device is similar to the one reported in [29], but with all elements fabricated in the silicon layer. It has 32 thermo-optic MRRs whose resonances can be tuned using associated integrated microheaters.…”

“…The thermo-optic MRRs are placed at a pitch of 100µm to minimize thermal crosstalk. Their measured resonance shift shows a thermal efficiency of 1 nm/mW [30], and the 3 dB passbands of the MRRs are measured to be ∼24 GHz [29]. The switch fabric has a compact footprint of 1.6×2.5 mm 2 with 34 electrical bonding pads.…”

Scalable Microring-Based Silicon Clos Switch Fabric With Switch-and-Select Stages

“…Since the inter-stage shuffle connects the 16 outputs of one stage to the 16 inputs of the following stage, its width is roughly the same as that of the inner shuffle within the 4 × 4 block (∼0.8 mm). For each building block, electrical pads can be placed right next to the MRR unit and electrical fan-out will be taken care of using a PCB or an interposer with flip-chip bonding technique as the one demonstrated in [25]. The dimension of the 16 × 16 Clos switch fabric with the fabricated 4 × 4 blocks can thus be estimated as 10 mm long by 6.4 mm wide.…”

“…18. The Si/SiN multi-layer platform can be leveraged [25], [41]; however, additional considerations should be taken to examine the trade-offs among design complexity, device footprint and yield, and the performance enhancement.…”

“…(a) Worst-case aggregated crosstalk ratio, number of maximum bypass rings and (b) worst-case aggregated ring loss, as a function of the switch port count N for both SNB and RNB Clos networks, as well as single-stage switchand-select devices. Calculations based on the measured results reported in[25].…”