V.R., Balaji, et al. “Integrated 25 GHz and 50 GHz Spectral Line Width Dense Wavelength Division Demultiplexer on Single Photonic Crystal Chip”. Opto-Electronics Review, vol. 26, no. 4, Apr. 2026, pp. 285-9, https://wydawnictwo.pan.pl/index.php/opelre/article/view/701.