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Adaptively modulated optical orthogonal frequency division multiplexing (AMOOFDM) modulation is experimentally evaluated using different photodiodes. A comparison is made between positive-intrinsic-negative (pin) and avalanche photodiode (APD) receivers in next generation passive optical network (NG-PON) downlink architecture. Direct modulation in transmission as well as direct detection in reception allows reducing the cost of the system. The results are obtained respecting the requirements of a class B+ optical budget. An additional amplifier is implemented to increase the reach of the pin photodiode. Although having a narrower bandwidth, the APD offers better performance than the pin. A bit rate of 10 Gbit/s can be reached for a distance of 60km with an optical budget of 30dB and without any optical amplifier. [ABSTRACT FROM AUTHOR]

Presented is a Mach-Zehnder based subsystem allowing polarisation independent reflective carrier suppressed optical modulation for application in frequency division multiple access (FDMA) and orthogonal frequency division multiple access (OFDMA) passive optical networks (PONs). This type of shared access technique requires the use of a coherent uplink receiver in the Central Office (CO). The proposed subsystem also acts as a Faraday mirror allowing simplification of the coherent receiver by removing the need for polarisation diversity. With this setup, a data rate better than 7.5 Gbit/s is experimentally demonstrated over a class B+ PON budget using discrete multi-tone (DMT) modulation. [ABSTRACT FROM AUTHOR]

An all-optical wavelength converter for optical access networks is proposed. Conversion from 1310 nm to the C-band is realised based on cross-absorption modulation in a 1550 nm electroabsorption modulator (EAM). Experimental results are presented and discussed. [ABSTRACT FROM AUTHOR]