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We proposed inverse-designed nanophotonic waveguide devices which have the desired optical responses in the wide band of 1450-1650?nm. The proposed devices have an ultra-compact size of just 1.5?µm × 3.0?µm and are designed on a silicon-on-insulator (SOI) waveguide platform. Individual nano-pixels with dimensions of 150?nm × 150?nm were made of either silicon or silicon dioxide, and the materials for the 200 total cells were determined using a trained deep neural network. While training the two networks, the hyperparameter optimization method was applied to make the training process efficient. We then fabricated the proposed devices using a CMOS-compatible fabrication process, and experimentally verified the fabricated device performance.