Abstract
Photonic chip-based soliton microcombs have shown rapid progress and have already been used in many system-level applications. There has been substantial progress in realizing soliton microcombs that rely on compact laser sources, culminating in devices that only utilize a semiconductor gain chip or a self-injection-locked laser diode as the pump source. However, generating single solitons with electronically detectable repetition rates from a compact laser module has remained challenging. Here we demonstrate a current-initiated, Si3N4 chip-based, 99-GHz soliton microcomb driven directly by a compact, semiconductor-based laser. This approach does not require any complex soliton tuning techniques, and single solitons can be accessed by tuning the laser current. Further, we demonstrate a generic, simple, yet reliable, packaging technique to facilitate the fiber-chip interface, which allows building a compact soliton microcomb package that can benefit from the fiber systems operating at high power (> 100 mW). Both techniques can exert immediate impact on chip-based nonlinear photonic applications that require high input power, high output power, and interfacing chip-based devices to mature fiber systems.
Highlights
The development of optical frequency combs led to crucial scientific and technological advancements in the field of optical metrology and spectroscopy [1]
While there has been substantial progress in realizing soliton microcombs that rely on compact laser diodes, culminating in devices that only utilize a semiconductor amplifier or a self-injection-locked laser as a pump source, accessing and generating single soliton states with electronically detectable line rates from a compact laser module has remained challenging
We demonstrate a current-initiated, Si3N4 chip-based, 99-GHz soliton microcomb driven directly by an ultra-compact, low-noise laser. This approach does not require any fast laser tuning mechanism, and single soliton states can be accessed by changing the current of the laser diode
Summary
ESA OSA OSC Si3N4 250 μm 100 μm FIG. 1. 1. Experimental setup for the generation of a 99-GHz soliton microcomb using the hybrid ULN laser. A) The compact hybrid laser consisting of a gain chip (GC) and a fiber Bragg grating (FBG) is coupled to a Si3N4 microresonator chip. The ULN laser consists of a gain chip and an external fiber cavity (top panel). The ultralow-noise (ULN) laser consists of two parts (Fig. 1b): The first part is a semiconductor based gain chip facilitating high power operation. It features a highly reflective facet on one side and an angled facet on the other side for out-coupling [18]. The microresonator and bus waveguide are both 1.5 μm wide
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