Distributed Feedback Laser Using Buried Dielectric Grating
In this paper, we report a DFB laser diode with a buried SiO2 grating. Epitaxy lateral overgrowth by metalorganic chemical vapour deposition (MOCVD) is conducted to grow the p-type InP cladding layers in the nano-patterned dielectric grating template. The large refractive index difference between SiO2 and InP results an index coupling coefficient κ of about 250 cm-1. The fabricated DFB laser showed a side mode suppression ratio larger than 45 dB measured. The technology developed can also be used for other applications that require high efficiency grating structure.
S. J. CHUA, J. H. TENG, O. WADA, R. DE LA RUE and X. H. TANG
J. H. Teng et al., "Distributed Feedback Laser Using Buried Dielectric Grating", Advanced Materials Research, Vol. 31, pp. 189-191, 2008