1.3 µm Quantum Dot-Distributed Feedback Lasers Directly Grown on (001) Si
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AbstractDistributed feedback (DFB) lasers represent a central focus for wavelength‐division‐multiplexing‐based transceivers in metropolitan networks. Here, the first 1.3 µm quantum dot (QD) DFB lasers grown on a complementary metal‐oxide‐semiconductor (CMOS)‐compatible (001) Si substrate are reported. Temperature‐stable, single‐longitudinal‐mode operation is achieved with a side‐mode suppression ratio of more than 50 dB and a threshold current density of 440 A cm−2. A single‐lane rate of 128 Gbit s−1 with a net spectral efficiency of 1.67 bits−1 Hz−1 is demonstrated, with an aggregate total transmission capacity of 640 Gbit s−1 using five channels in the O‐band. Apart from the QD active region growth, the overall fabrication is essentially identical to the commercial process for quantum well (QW) DFB lasers. This provides a process‐compatible path for QD technology into commercial applications previously filled by QW devices. In addition, the capability to grow laser epi across entire CMOS‐compatible (001) Si wafers adds extra benefits of reduced cost, improved heat dissipation, and manufacturing scalability. Through direct epitaxial integration of III–Vs and Si, one can envision a revolution of the photonics industry in the same way that CMOS design and processing revolutionize the microelectronics industry. This is discussed from a system perspective for on‐chip optical interconnects.
Acceptance Date08/06/2020
All Author(s) ListWan YT, Norman JC, Tong YY, Kennedy MJ, He W, Selvidge J, Shang C, Dumont M, Malik A, Tsang HK, Gossard AC, Bowers JE
Journal nameLaser and Photonics Reviews
Volume Number14
Issue Number7
PublisherWiley-VCH Verlag
Article number2000037
LanguagesEnglish-United Kingdom
Keywordsheteroepitaxy, quantum dot lasers, Si photonics
Web of Science Subject CategoriesOptics;Physics, Applied;Physics, Condensed Matter;Optics;Physics

Last updated on 2021-21-01 at 00:20