>20 dB phase noise reduction by locking an off-the-shelf external cavity laser having sub-kHz linewidth to an on-chip wavelength reference in Si3N4 using an electronic feedback loop on the diode injection current

Dimitri Geskus; Tommie F. L. Verouden; Wilson Tsong; Arjan Meijerink; Ian van den Vlekkert; Sami Musa

doi:10.1117/12.2668707

17 March 2023 >20 dB phase noise reduction by locking an off-the-shelf external cavity laser having sub-kHz linewidth to an on-chip wavelength reference in Si₃N₄ using an electronic feedback loop on the diode injection current

Dimitri Geskus, Tommie F. L. Verouden, Wilson Tsong, Arjan Meijerink, Ian van den Vlekkert, Sami Musa

Author Affiliations +

Proceedings Volume 12425, Smart Photonic and Optoelectronic Integrated Circuits 2023; 124250F (2023) https://doi.org/10.1117/12.2668707
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Wavelength stabilization of external cavity lasers is a of key importance to exploit their sub-kHz intrinsic linewidth. In this work we demonstrate < 20 dB optical phase noise reduction at acoustic frequencies using a simple off-the-shelf electronic feedback loop. The novelty here is that we exploit an on-chip optical frequency discriminator (OFD) in Si3N4 (TriPleX), based on an aMZI with a path length difference of 1.4 m, having less than 10 dB loss. The used setup has a bandwidth of approximately 1 MHz, allowing for wavelength modulation depth in the order of tens of MHz.

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Dimitri Geskus, Tommie F. L. Verouden, Wilson Tsong, Arjan Meijerink, Ian van den Vlekkert, and Sami Musa ">20 dB phase noise reduction by locking an off-the-shelf external cavity laser having sub-kHz linewidth to an on-chip wavelength reference in Si₃N₄ using an electronic feedback loop on the diode injection current", Proc. SPIE 12425, Smart Photonic and Optoelectronic Integrated Circuits 2023, 124250F (17 March 2023); https://doi.org/10.1117/12.2668707

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