Colorless FDMA-PON with flexible bandwidth allocation and colorless, low-speed ONUs [invited]

Schindler, P. C., Schmogrow, R., Dreschmann, M., Meyer, J., Tomkos, Ioannis, Prat, J., Krimmel, H-G., Pfeiffer, T., Kourtessis, Pandelis, Ludwig, A., Karnick, D., Hillerkuss, D., Becker, J., Koos, C., Freude, W. and Leuthold, J. (2013) Colorless FDMA-PON with flexible bandwidth allocation and colorless, low-speed ONUs [invited]. IEEE/OSA Journal of Optical Communications and Networking, 5 (10). A204 - A212. ISSN 1943-0620
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We demonstrate a remotely seeded flexible passive optical network (PON) with multiple low-speed subscribers but only a single optical line terminal transceiver operating at a data rate of 31.25 Gbits/s. The scheme is based on a colorless frequency division multiplexing (FDM)-PON with centralized wavelength control. Multiplexing and demultiplexing in the optical network unit (ONU) is performed in the electronic domain and relies either on FDM with Nyquist sinc-pulse shaping or on orthogonal frequency division multiplexing (OFDM). This way the ONU can perform processing at low speed in the baseband. Further, the ONU is colorless by means of a remote seed for upstream transmission and a remote local oscillator for heterodyne reception, all of which helps in keeping maintenance and costs for an ONU potentially low and will simplify wavelength allocation in a future software defined network architecture. To extend the reach, semiconductor optical amplifiers are used for optical amplification in the downstream and upstream.

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