Two feed-forward (FF), non-data aided (NDA) digital clock recovery methods in time and frequency domain are discussed and experimentally evaluated with respect to their real-time performance and digital hardware utilization.

No abstract

We demonstrate add/drop multiplexing of optical QPSK signals using an optic-electronic-optic (OEO) interferometer with a processing path including opto-electronic coherent detection, real-time digital signal processing, and electro-optic complex field remodulation.

No abstract

We compare three feedforward non-data-aided clock recovery algorithms suitable for burst-mode reception in PONs and datacenters. Our experimental setup allows real-time OOK transmission at 3 Gbit/s. The tolerable clock frequency mismatch is 475 ppm.