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Synchronous optical packet buffering is demonstrated utilizing a fiber-based synchronizer with a photonic integrated circuit packet buffer. Asynchronously arriving packets are optically synchronized to a local frame clock and loaded synchronously into the optical buffer. The synchronizer is a four-stage design with a resolution of 853 ps and a dynamic tuning range of 12.8 ns. The optical packet buffer consists of an integrated 2 × 2 InP switch coupled to a silica-on-silicon 12.8-ns delay line. Packet recovery measurements of 40-B return-to-zero packets at 40 Gb/s show-error free performance for several combinations of synchronizer and buffer delays.