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Soliton microcombs offer the prospect of advanced optical metrology andtiming systems in compact form factors. In these applications, pumping ofmicrocombs directly from a semiconductor laser without amplification ortriggering components is desirable for reduced power operation and to simplifysystem design. At the same time, low repetition rate microcombs are required inmany comb applications for interface to detectors and electronics, but theirincreased mode volume makes them challenging to pump at low power. Here, 10 GHzrepetition rate soliton microcombs are directly pumped by low-power (< 20 mW)diode lasers. High-Q silica microresonators are used for this low poweroperation and are packaged into fiber-connectorized modules that featuretemperature control for improved long-term frequency stability.

Directly pumped 10 GHz microcomb modules from low-power diode lasers