Zhou, Zichuan; Farwell, Selina; Wale, Michael; Liu, Zhixin; (2025) Switching Dynamics of DS-DBR Laser under Optical Injection Locking to Achieve Fast Optical Switching with Enhanced Coherence. Optics Letters , 50 (18) pp. 5638-5641. 10.1364/ol.561441.

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Abstract

Wavelength switching is a promising candidate for future optically switching flat data center network due to its high scalability. The wavelength switching latency of a tunable laser must be maintained within few nanoseconds to ensure high network throughput, because data center IT traffic is dominated by small-sized packets (e.g., hundreds of ns). In addition to this, the increasing data capacity demand has triggered the need for coherent transmission in nextgeneration data center interconnection. As a result, tunable laser must simultaneously feature low linewidth and fast switching time. However, these two requirements are inherently contradictory, as narrow linewidth requires laser designs to achieve a long photon lifetime, while fast switching requires a short photon lifetime. We demonstrate using the optical injection locking (OIL) technique to improve the phase noise of a ns-scale switching digital supermode (DS) distributed Bragg reflector (DBR) laser. With −24 dBm injection power, we show that DS-DBR laser coherence is significantly improved, with linewidth performance following seed laser (≤15 kHz). With optical injection locking, the switching latency is also slightly improved, with ≤5 ns for both rising and falling edges.

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