Ultra-narrow-linewidth mode-locked lasers with wide wavelength tunability can be versatile light sources for a variety of newly emergent applications. However, it is very challenging to achieve the stable mode locking of substantially long, anomalously dispersive fiber laser cavities employing a narrowband spectral filter at the telecom band. Here, we show that a nearly dispersion-insensitive dissipative mode-locking regime can be accessed through a subtle counterbalance among significantly narrowband spectral filtering, sufficiently deep saturable absorption, and moderately strong in-fiber Kerr nonlinearity. This achieves ultra-narrow-linewidth (a few gigahertz) nearly transform-limited self-starting stable dissipative soliton generation at low repetition rates (a few megahertz) without cavity dispersion management over a broad tuning range of wavelengths covering the entire telecom C-band. This unique laser may have immediate application as an idealized pump source for high-efficiency nonlinear frequency conversion and nonclassical light generation in dispersion-engineered tightly light-confining microphotonic/nanophotonic systems.

中文翻译：

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电信频段全参数可调超窄线宽耗散孤子生成

具有宽波长可调性的超窄线宽锁模激光器可以成为各种新兴应用的通用光源。然而，在电信波段采用窄带光谱滤波器实现相当长的、异常色散的光纤激光腔的稳定锁模是非常具有挑战性的。在这里，我们表明可以通过显着窄带光谱滤波、足够深的可饱和吸收和适度强的光纤内克尔非线性之间的微妙平衡来访问几乎对色散不敏感的耗散锁模机制。这实现了超窄线宽（几千兆赫）在低重复率（几兆赫）下几乎受变换限制的自启动稳定耗散孤子生成，而无需在覆盖整个电信 C 波段的宽波长调谐范围内进行腔色散管理. 这种独特的激光器可以作为理想化的泵浦源立即应用，用于色散设计的紧密光限制微光子/纳米光子系统中的高效非线性频率转换和非经典光生成。