Chang Sup Shim

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We demonstrate a bidirectional wavelength-division-multiplexing (WDM) self-healing passive optical network (PON), which can provide 1+1 protection capability. In this network, self-healing can be achieved within 8 ms against any fiber cut of the feeder fiber and the distribution fiber.
We report a novel clock recovery circuit for 10Gbit/s lightwave transmission systems, which consists of a new NRZ-to-Pseudo-RZ converter for the generation of a clock signal from NRZ data. The new NRZ-to-PRZ converter generates both the differentiated and the phase-inverted differentiated signal of NRZ data and rectifies them, resulting in a discrete clock(More)
We demonstrate a cost-effective bidirectional WDM self-healing ring network using wavelengthinterleaved bidirectional add/drop amplifier modules. The measured restoration time was less than 10 ms. Recently, bidirectional WDM self-healing ring (SHR) networks based on bidirectional transmission have been proposed [1]-[3]. In these networks, each node should(More)
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