2023
DOI: 10.1038/s41377-023-01172-9
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Linewidth narrowing in self-injection-locked on-chip lasers

Abstract: Stable laser emission with narrow linewidth is of critical importance in many applications, including coherent communications, LIDAR, and remote sensing. In this work, the physics underlying spectral narrowing of self-injection-locked on-chip lasers to Hz-level lasing linewidth is investigated using a composite-cavity structure. Heterogeneously integrated III–V/SiN lasers operating with quantum-dot and quantum-well active regions are analyzed with a focus on the effects of carrier quantum confinement. The intr… Show more

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Cited by 20 publications
(5 citation statements)
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References 65 publications
(70 reference statements)
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“…Quantum-dot (QD) lasers are preferred over quantum-well lasers because they have a greater laser thermal stability and lower lasing threshold due to 3D confinement of the carriers. A theoretical framework for heterogeneous integration of QD lasers on Si can be found in [57,58]. Quantum-dot lasers bonded on Si have been reported recently.…”
Section: D2w Bondingmentioning
confidence: 99%
“…Quantum-dot (QD) lasers are preferred over quantum-well lasers because they have a greater laser thermal stability and lower lasing threshold due to 3D confinement of the carriers. A theoretical framework for heterogeneous integration of QD lasers on Si can be found in [57,58]. Quantum-dot lasers bonded on Si have been reported recently.…”
Section: D2w Bondingmentioning
confidence: 99%
“…12) Therefore, self-injection locking using an external cavity has been employed in various applications, enabling significant linewidth narrowing in semiconductor lasers. [13][14][15][16][17][18][19][20] The self-injection locking effect is generated by injecting a feedback light from an external cavity with a high Q-factor into the laser cavity. Microring resonators, whispering gallery mode resonators, and fiber ring resonators have been used as external cavities.…”
Section: Introductionmentioning
confidence: 99%
“…Microring resonators, whispering gallery mode resonators, and fiber ring resonators have been used as external cavities. [13][14][15][16][17][18][19][20] The coupling efficiency is important for self-injection locking. If the coupling efficiency is too high, coherence collapse occurs and the linewidth increases, whereas, if the coupling efficiency is too small, the self-injection locking effect weakens, and linewidth narrowing does not occur.…”
Section: Introductionmentioning
confidence: 99%
“…The requirements of ideal chip-scale lasers include sufficient large power with high power efficiency, continuous-wave emission in fiber-based communication bands, compatibility with CMOS (complementary metal oxide semiconductor) processes, and so on . Taking silicon-based PIC as an example, Group III–V lasers have been commercialized for a long time and have been explored extensively to combine with silicon photonics using hybrid and heterogeneous integration. Meanwhile, silicon-based Raman lasers, silicon quantum dots lasers, and other Group IV lasers that could be monolithically integrated with silicon photonics are attracting researchers’ attention.…”
Section: Introductionmentioning
confidence: 99%