We present an angled multimode interferometer (AMMI) wavelength division (de)multiplexer on a 220 nm silicon-on-insulator platform, which is designed and operated for C-band wavelengths. The length of the AMMI is 855 µm, and can provide a channel spacing of 15 nm and a crosstalk suppression of 7 dB. Through inverse design, the length of the AMMI is reduced to 300 µm with a channel spacing at 8 nm; also to be operated at C band wavelengths. In addition, using shape optimization on a 2x2 multimode interferometer, the length of the device is reduced from 158 µm to 40 µm with improved performance in terms of transmission variation across the C-band.
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