Synchronous 16-QAM Transmission in a FPGA-Based Coherent Receiver with Different Phase Estimation Filter Lengths

Conference: Photonische Netze - 12. ITG-Fachtagung
05/02/2011 - 05/03/2011 at Leipzig, Germany

Proceedings: Photonische Netze

Pages: 3Language: englishTyp: PDF

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Al-Bermani, Ali; Hoffmann, Sebastian; Noé, Reinhold (University of Paderborn, EIM-E, Warburger Str. 100, 33098 Paderborn, Germany)
Wördehoff, Christian; Rückert, Ulrich (Bielefeld University, CITEC, Universitätsstr. 21, 33615 Bielefeld, Germany)

In this article we present the implementation of a 16-QAM transmission system with feedforward realtime synchronous demodulation and data recovery. Different filter lengths (half-width N) were evaluated and a realtime data throughput of 2.5 Gbit/s was achieved. The 625 Mbaud (4x625 Mb/s) data is transmitted over one span of single-mode fiber, and is received in a realtime I&Q homodyne setup with standard external cavity laser. For powers larger than -30dBm, the average bit error rate (BER) is below forward-error correction (FEC) limit (7% overhead).