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Investigation of Dynamic Effects and Coherence Limits of Hybrid Si/III-V Lasers

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Technical Report,01 Oct 2015,30 Sep 2016

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California Institute of Technology Pasadena United States

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We have achieved the 3 tasks we set out to complete 1. We dramatically improved the performance of the frequency noise power spectral density measurement setup allowing measurement to be taken at 300 MHz. This enabled the measurement of a sub kHz Schawlow-Townes linewidth. 2. We have theoretically and experimentally investigated the limits of high coherence Si-IIIV lasers considering non-linearities that exist in Si. We have found that while the coherence of these lasers can be increased by moving a larger fraction of the light from the high loss IIIV to the low loss Si, FCA and TPA limit the output power and external efficiency of the lasers. We also proposed methodologies to overcome limitations imposed by FCA and TPA while still using silicon as a photon storage device. 3. We have investigated the modulation characteristics of the Si-IIIV lasers. It might be advantageous to consider enabling heterogeneously integrated lasers on different materials platforms to avoid non-linearities present in silicon.

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  • Lasers and Masers

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