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Proceedings Paper

Reconfigurable optical transmitters and receivers
Author(s): Wolfgang Freude; René Schmogrow; David Hillerkuss; Joachim Meyer; Michael Dreschmann; Bernd Nebendahl; Michael Huebner; Juergen Becker; Christian Koos; Juerg Leuthold
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Paper 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.

Paper Details

Date Published: 25 January 2012
PDF: 8 pages
Proc. SPIE 8284, Next-Generation Optical Communication: Components, Sub-Systems, and Systems, 82840A (25 January 2012); doi: 10.1117/12.914239
Show Author Affiliations
Wolfgang Freude, Karlsruhe Institute for Technology (Germany)
René Schmogrow, Karlsruhe Institute for Technology (Germany)
David Hillerkuss, Karlsruhe Institute for Technology (Germany)
Joachim Meyer, Karlsruhe Institute for Technology (Germany)
Michael Dreschmann, Karlsruhe Institute for Technology (Germany)
Bernd Nebendahl, Agilent Technologies Deutschland GmbH (Germany)
Michael Huebner, Karlsruhe Institute for Technology (Germany)
Juergen Becker, Karlsruhe Institute for Technology (Germany)
Christian Koos, Karlsruhe Institute for Technology (Germany)
Juerg Leuthold, Karlsruhe Institute for Technology (Germany)

Published in SPIE Proceedings Vol. 8284:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems
Guifang Li; Dieter Stefan Jäger, Editor(s)

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