The authors report for the first time an external cavity laser composed of a spot-size converted LD and a UV written waveguide grating, both integrated on Si. The laser operates in a single mode with a side-mode suppression of 37 dB. The threshold current is 12 mA and the average thermal coefficient is as low as -1.7 GHz.

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Journal Electronics Letters
Albert, J, Takahashi, H., Oguma, M., Hibino, Y., Yamada, Y., & Itaya, Y. (1996). Integrated external cavity laser composed of spot-size converted LD and UV written grating in silica waveguides on Si. Electronics Letters. doi:10.1049/el:19960819