In this paper, first a new configuration for a preamplifier circuit used in broadband optical communication networks is presented. Secondly this dcfferential transimpedance amplifier has been implemented in both a bipolar and a CMOS process. Simple formulas for the main characteristics are derived for both implementations. Measurements show the good pe$ormance of the configuration used, and highlight the differences between both implementations.

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This paper contains experimental results obtained from the ACTS PLANET (Photonic Local Access NETwork) Lab demonstrator, which confirm the technical feasibility of the SuperPON concept. The SuperPON is an optical fibre-based A TM access network which can support a large number of subscriber Optical Network Units (ONUs) up to 2048 and cover a long distance of 100 km. This contribution shows detailed results of upstream experiments carried out on newly developed fast switching and gain controlled Optical Repeater Units (ORUs). Performance data on cascaded Semiconductor Optical Amplifiers (SOAs) include Bit Error Ratio (BER) measurements, and Signal Noise Ratio (SNR) degradation due to the introduction of cascaded SOAs. Experimental results confirm that a SuperPON can service 2048 ONUs over a distance of 100 km.

This paper describes a novel TDMAIFDMA combined 16 QAM receiver architecture developed for video-on-demand applications. A burst-operated rapid synchronisation scheme is proposed which employs an efficient training preamble for overlapped operation of automatic gain control, carrier phase acquisition and symbol timing alignment. All the dedicated synchronisation algorithms are digitally implemented, using field programmable gate arrays (FPGA), for a data rate of 1O.8Mbit/s. Several analytic relationships for control accuracy, acquisition time and signal to noise ratio (S/N) are derived. Experimental results demonstrate that the proposed method significantly decreases the required preamble length to 23 symbols, together with a dynamic range of 1 1dB and a sensitivity of-56dBm for a bit-error-rate (BER) of 5*1 O. The BER performance with frequency offset and input power variation is also investigated.

This paper describes the TDMA uplink of the ACTS PLANET project, realising a high split long range access network using optical amplification. An overview of the network topology and the different building blocks is given. In particular, the differentiating burst mode receiver, the optical repeater units and the amplified splitter controller will be discussed. Bit error measurements were performed to define the system limits of the access network. It is shown that a feeder length of 90 km, in combination with a split factor of 2000 and a drop section length of 10 km are feasible.