Closed all-optical cycles in wavelength division multiplexing (WDM) optical networks may generate lasing resulting in adverse effects to network performance. In this paper, causes and physical conditions for both all-optical idle cycles and all-optical leakage cycles are analyzed by using optical spectrum of the network. A five-node experimental optical network is built. Multiple lasing peaks are observed to co-exist and compete in a fiber. Affects of the filtering characteristic mismatch of optical nodes to all-optical lasing cycles are discussed. We point out that multiple closed leakage cycles may occur in one optical channel in the case of bandwidth mismatch. Two lasing peaks of leakage cycles are observed in one channel and they can co-exist with the signal wavelength. Finally, harms of lasing cycles are discussed and methods are proposed for eliminating them.
In this paper, a new type of re-configurable all optical add/drop multiplexer (OADM) with dynamic gain control function is presented. The channel spacing of the input four-wavelength WDM signal is 3.2nm. The function of adding and dropping any wavelength component of the signal is demonstrated. The total loss is less than ldB (The gain of each SOA is set to about 6dB). Under the control of the gain management unit (GMU), the difference of each channel is less than 0.3dB. Due to the transparency of the OADM, it can add/drop different kinds (such as different format or bit rate) of optical signal. In this paper, we also presented the experimental setup and discussed its results. The highest test bit rate of the WDM signal is 2.5Gbit/s. Its applications in the WDM all optical networks are also discussed.
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