期刊
OPTICS EXPRESS
卷 28, 期 15, 页码 21713-21728出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.398906
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资金
- Horizon 2020 Framework Programme [780502 (3PEAT)]
- Rijksdienst voor Ondernemend Nederland (IOP Photonic Devices program)
We demonstrate a hybrid integrated and widely tunable diode laser with an intrinsic linewidth as narrow as 40 Hz, achieved with a single roundtrip through a low-loss feedback circuit that extends the cavity length to 0.5 meter on a chip. Employing solely dielectrics for single-roundtrip, single-mode resolved feedback filtering enables linewidth narrowing with increasing laser power, without limitations through nonlinear loss. We achieve single-frequency oscillation with up to 23 mW fiber coupled output power, 70-nm wide spectral coverage in the 1.55 mu m wavelength range with 3 mW output and obtain more than 60 dB side mode suppression. Such properties and options for further linewidth narrowing render the approach of high interest for direct integration in photonic circuits serving microwave photonics, coherent communications, sensing and metrology with highest resolution. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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