Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-3-2354
Timestamp: 2019-04-20 11:17:51+00:00

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We demonstrate hybridly integrated narrow-linewidth, tunable diode lasers in the InP/GaAs-Si3N4 platform. Silicon nitride photonic integrated circuits, instead of silicon waveguides that suffer from high optical loss near 1 µm, are chosen to build a tunable external cavity for both InP and GaAs gain chips at the same time. Single frequency lasing at 1.55 µm and 1 µm is simultaneously obtained on a single chip with spectral linewidths of 18-kHz and 70-kHz, a side mode suppression ratio of 52 dB and 46 dB, and tuning range of 46 nm and 38 nm, respectively. The resulting dual-band narrow-linewidth diode lasers have potential for use in a variety of novel applications such as integrated difference-frequency generation, quantum photonics, and nonlinear optics.
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Fig. 1 Schematic plot of the hybridly integrated diode laser.
Fig. 2 (a) Spot size converter and the profile evolution of the optical mode propagating from the single-mode ridge waveguide in the gain chip to the silicon nitride waveguide. (b) Simulated and measured transmission spectra of the double-ring filter. (c) SEM image of the Si3N4 cleaved waveguide facet.
Fig. 3 Experimental results of the InP-Si3N4 hybrid laser. (a) L-I curve (blue) and I-V curve (red). (b) Normalized output optical spectrum with the single frequency operation. (c) Delayed self-heterodyne experimental setup; OSA: optical spectrum analyzer; VOA: variable optical attenuator; FPC: fiber polarization controller; PD: photodiode; ESA: electrical spectrum analyzer; EOM: electro-optic modulator. (d) Recorded RF beat spectrum (red dots), the blue line shows a Lorentzian fit corresponding to a laser linewidth of 18-kHz. (e) Superimposed spectra when we thermally tune one of the two microresonators (the tuning range is ~46 nm).
Fig. 4 Experimental results of the GaAs-Si3N4 hybrid laser. (a) L-I curve (blue) and I-V curve (red). (b) Normalized output optical spectrum. (c) Recorded RF beat spectrum (red dots), the blue line shows a Lorentzian fit corresponding to a laser linewidth of 70-kHz. (d) Superimposed spectra when we thermally tune one of the two microresonators.

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