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Reports the results of an experimental and numerical simulation study on optimum 10-Gb/s nonreturn-to-zero receiver bandwidths for ultradense wavelength-division-multiplexing (UDWDM) transmission systems. It is found that as channel spacing is scaled down to UDWDM dimensions from 50 to 25 GHz, the,optimum receiver bandwidth increases. Moreover, an UDWDM system with 25-GHz channel spacing offers the opportunity to improve receiver performance by taking advantage of the optical matched filter concept. A 25-GHz channel spacing optical filter, designed to approach the performance of an optical matched filter, shows a /spl sim/1.3 dBQ advantage compared to a 50-GHz channel spacing optical filter when receiver bandwidth is optimized.