Recently, various WDM passive optical networks (PON's) have been proposed [1-4]. This is because WDM PON's offer many advantages including large capacity, network security, and upgradability. However, these networks require low-cost WDM sources and efficient use of outside plants for practical implementation. For this purpose, we demonstrated a new WDM PON architecture that utilized spectrum-sliced WDM sources and only one waveguide grating router (WGR) at the remote node (RN) for both demultiplexing the downstream channels and multiplexing the upstream channels [4]. In this paper, we report the improved version of this network for bidirectional transmission over single strand of fiber. The demonstrated network provided fifteen 500-Mb/s downstream channels and 155-Mb/s upstream channels using a spectrum-sliced fiber amplifier light source and fifteen 1.5-μm LED's, respectively.
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