Reconfigurable optical transmitters and receivers

Wolfgang Freude; René Schmogrow; David Hillerkuss; Joachim Meyer; Michael Dreschmann; Bernd Nebendahl; Michael Huebner; Juergen Becker; Christian Koos; Juerg Leuthold

doi:10.1117/12.914239

24 January 2012 Reconfigurable optical transmitters and receivers

Wolfgang Freude, René Schmogrow, David Hillerkuss, Joachim Meyer, Michael Dreschmann, Bernd Nebendahl, Michael Huebner, Juergen Becker, Christian Koos, Juerg Leuthold

Author Affiliations +

Proceedings Volume 8284, Next-Generation Optical Communication: Components, Sub-Systems, and Systems; 82840A (2012) https://doi.org/10.1117/12.914239
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

Recent advances in electronic data processing allow constructing reconfigurable optical transmitters and receivers, where modulation formats and symbol rates are set by software-controlled field programmable gate arrays (FPGA). We report on such a real-time optical transmitter for 8 modulation formats, which can be swapped in 5 ns without data loss. With single-polarization 64QAM symbols generated at 28 GBd, we transmit data at 168 Gbit/s in real time. A similar arrangement defines a single-polarization orthogonal frequency division multiplexing (OFDM) transmitter for a data rate of 101.5 Gbit/s, where 58 subcarriers are encoded with 16QAM data. With a different software setup, the FPGA realizes an optical 56 Gbit/s transmitter for sinc-shaped so-called Nyquist pulses, the spectrum of which is rectangular having the minimum theoretically achievable bandwidth (suitable for Nyquist wavelength division multiplexing, N-WDM). For terabit OFDM reception, optical pre-processing is required to demultiplex high-bitrate signals down to lower-bitrate tributaries, which then can be processed electronically. We discuss a 10.8 Tbit/s (26 Tbit/s) receiver employing an all-optical fast Fourier transform to demultiplex 75 (325) optical subcarriers modulated with 16QAM-formated symbols at a rate of 18 GBd (10 GBd). Groups with any number of subcarriers can be selected with a simple hardware reconfiguration step.

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Wolfgang Freude, René Schmogrow, David Hillerkuss, Joachim Meyer, Michael Dreschmann, Bernd Nebendahl, Michael Huebner, Juergen Becker, Christian Koos, and Juerg Leuthold "Reconfigurable optical transmitters and receivers", Proc. SPIE 8284, Next-Generation Optical Communication: Components, Sub-Systems, and Systems, 82840A (24 January 2012); https://doi.org/10.1117/12.914239

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KEYWORDS

Orthogonal frequency division multiplexing

Transmitters

Modulation

Receivers

Field programmable gate arrays

Digital signal processing

Signal processing

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