Wavelength-division multiplexing communications using integrated soliton microcomb laser source

TL;DR

This paper demonstrates the use of integrated Kerr soliton microcombs as multi-channel laser sources for WDM optical communications, achieving high-quality data transmission with low noise and no pre-amplification.

Contribution

It introduces a fully integrated soliton microcomb source for WDM communications, showing its feasibility and advantages for high-speed data transmission.

Findings

Successful 7-channel 16-QAM data transmission over fiber links

Low noise levels suitable for advanced data encoding

Elimination of pre-amplification due to boosted power levels

Abstract

In this Letter, we investigate the feasibility and performance of wavelength division multiplexed (WDM) optical communications using an integrated dissipative Kerr soliton micro-comb as the multi-channel laser source. First, we confirm that soliton microcomb pumped directly by a DFB laser self-injection locked to the host micro-cavity has sufficiently low frequency and amplitude noises to encode advanced data formats. Second, perfect soliton crystals are exploited to boost the power level of each microcomb line, so that they can be directly used for data modulation excluding pre-amplification. Third, in a proof-of-concept experiment we demonstrate 7-channel 16-QAM data transmissions using an integrated perfect soliton microcomb as the laser carriers, excellent data receiving performances are obtained under various fiber link distances and amplifier configurations. Our study reveals that fully integrated Kerr soliton microcombs are viable and advantageous for optical data communications.