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

## TL;DR

This paper demonstrates the direct generation of 10 GHz soliton microcombs using low-power diode lasers, enabling compact, stable, and power-efficient optical systems for metrology and timing applications.

## Contribution

It introduces a method to directly pump 10 GHz microcombs with low-power diode lasers using high-Q silica microresonators, simplifying system design and reducing power consumption.

## Key findings

- Microcombs directly pumped at <20 mW power.
- Use of fiber-connectorized modules with temperature control.
- Achieved stable 10 GHz soliton microcombs.

## Abstract

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