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We address microwave signal generation utilizing the heterogeneous photonic integration platform, highlight the benefits of such approach and show preliminary results from a heterogeneously integrated photonic microwave signal generator. We address in detail narrow-linewidth tunable lasers as one of key components.
We investigate the design of hybrid silicon colliding-pulse mode-locked laser diodes and the dependence on quantum well design. We show the reduction in microwave linewidth using two techniques. First, reducing the number of quantum wells reduces the confinement factor thereby lowering the spontaneous emission contribution to the linewidth. Second, a ∼4-cm long on-chip feedback cavity is used to provide...
We demonstrate preliminary results from a monolithically integrated tunable laser with narrow-linewidth. Experimental results show tuning in excess of 54 nm in the O-band as well as significant reduction in laser linewidth due to the external cavity. The measured linewidth with external cavity, currently limited by measurement setup, is around 150 kHz.
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