A photonic integrated circuit based erbium-doped amplifier

Liu, Yang; Qiu, Zheru; Ji, Xinru; He, Jijun; Riemensberger, Johann; Hafermann, Martin; Wang, Rui Ning; Liu, Junqiu; Ronning, Carsten; Kippenberg, Tobias J.

doi:10.48550/arxiv.2204.02202

Cited by 1 publication

(1 citation statement)

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“…The effort to integrate high-performance optical systems on-chip has made tremendous progress in recent years. Advancements in ultra-low-loss photonic platforms [1], nonlinear photonics [2], and heterogenous material integration [1,3] have enabled fully integrated turnkey frequency comb sources [1,4], on-chip lasers with Hertz linewidth [5], Tbps communications on-chip [6,7], on-chip optical amplifiers [8], and much more. While these systems will continue to improve, a lack of integrated optical isolation limits their performance.…”

Section: Introductionmentioning

confidence: 99%

Integrated Passive Nonlinear Optical Isolators

White¹,

Ahn²,

Gasse³

et al. 2022

Preprint

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Fiber and bulk-optical isolators are widely used to stabilize laser cavities by preventing unwanted feedback. However, their integrated counterparts have been slow to be adopted. While several strategies for onchip optical isolation have been realized, these rely on either integration of magneto-optic materials or high frequency modulation with acoustooptic or electro-optic modulators. Here, we demonstrate an integrated approach for passively isolating a continuous wave laser using the intrinsically non-reciprocal Kerr nonlinearity in ring resonators. Using silicon nitride as a model platform, we achieve single ring isolation of 17-23 dB with 1.8-5.5 dB insertion loss, and a cascaded ring isolation of 35 dB with 5 dB insertion loss. Employing these devices, we demonstrate hybrid integration and isolation with a semi-conductor laser chip.

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