Directly modulated quantum dot lasers on silicon with a milliampere threshold and high temperature stability

Y. Wan, D. Inoue, D. Jung, J. C. Norman, C. Shang, A. C. Gossard, and J. E. Bowers
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Illustration of one fabricated microring laser
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Photonics Research
Vol. 6, No. 8, pages 776-781

Microring lasers feature ultralow thresholds and inherent wavelength-division multiplexing functionalities, offering an attractive approach to miniaturizing photonics in a compact area. Here, we present static and dynamic properties of microring quantum dot lasers grown directly on exact (001) GaP/Si. Effectively, a single-mode operation was observed at 1.3 μm with modes at spectrally distant locations. High temperature stability with T 0∼103 K has been achieved with a low threshold of 3 mA for microrings with an outer ring radius of
15 μm and a ring waveguide width of 4 μm. Small signal modulation responses were measured for the first time for the microrings directly grown on silicon, and a 3 dB bandwidth of 6.5 GHz was achieved for a larger ring with an outer ring radius of 50 μm and a ring waveguide width of 4 μm. The directly modulated microring laser, monolithically integrated on a silicon substrate, can incur minimal real estate cost while offering full photonic functionality.

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Research Areas
Silicon Photonics
More Research Areas
Epitaxial Growth on Si