Abstract
The chirp managed laser (CML) mainly includes a directly modulated laser followed by an optical spectrum reshaper (OSR) filter. In this paper, an integral layer-peeling method has been applied to synthesize the OSR filter with the desired reflection spectrum, which breaks the trade-off between the filter bandwidth and the filter slope steepness inherently existing in the FP etalon based filter, and hence greatly facilitates the optimization design of the OSR for a better transmission performance of a CML. Using this approach, we have, respectively, investigated the optimization design of the OSR filter in terms of the edge slope and the 3 dB bandwidth in the CML modulated at 10 and 25 Gb/s, through studying their transmission performances over the standard single-mode fiber. With the optimum design of OSR, the longest transmission distances at which the power penalty is 1 dB at a bit error rate of 10−12 are 135 and 18 km for the 10 and 25 Gb/s CML, respectively.
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