A 12-channel Silicon-on-Insulator (SOI)-based Arrayed Waveguide Grating (AWG) with different core width sizes of 1.2 11m and 1.0 11m was designed and characterized for Coarse Wavelength Division Multiplexing (CWDM) System. Beam Propagation Method (BPM) was used to simulate the propagation of light in this device at operating wavelength of 1.491 11m which producing the peak transmission wavelengths ranging from 1391 to 1611 nm. The output spectrum peaks that were obtained from both core widths are close to the CWDM wavelength grid. The core width of 1.2 11m produced the lowest insertion loss and adjacent crosstalk with the values of 4.03 dB and -15.02 dB respectively. Meanwhile, insertion loss of 5.03 dB and adjacent crosstalk of -15.96 dB was obtained from the 1.0 11m core width device where the losses are higher. Hence, the A WG device with larger core width size produced a better insertion loss and adjacent crosstalk.
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