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Low-power, high-sensitivity 30-Mbit/s burst-mode/packet receiver for PON application

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Abstract

Recently, optical data links have played an important role in communications. In some data links the signal formats are unique and cannot be handled by an ordinary optical receiver. For example, in the optical bus and passive optical network (PON), the digital optical data are transmitted burst mode with their optical powers differing from one packet to the next. In PON, communications are carried out between a central terminal (OSU: optical subscriber unit) and multiple user terminals (ONU: optical network unit). The OSU receiver receives data time-shared by multiple ONU signal sources whose amplitudes can vary by factors of 100 to 1 or more. In this case the receiver must be able to handle the following three conditions: (1) the data are transmitted in the form of burst, (2) the optical amplitude of each data packet can vary, and (3) the cumulative dc optical level may be much higher than the optical amplitude in some packets. This last situation is illustrated in Fig. 1.

© 1994 Optical Society of America

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