The market for 100Gb/s per lane multimode (MM) vertical-cavity surface-emitting lasers (VCSELs) continues to be driven by the growing demand from data centers, cloud storage, and enterprise networks. Low cost and energy efficient VCSEL-based multimode links are especially suited for the high speed interconnections (HSI) that facilitate generative artificial intelligence (AI). The VCSEL technologies are largely shaped by the Fibre-channel and the Ethernet standards, and more recently by the Terabit Bidi MSA and InfiniBand requirements. In this paper, we present the development and performance of a 940nm multimode VCSEL with 3-dB small-signal modulation bandwidth exceeding 25GHz over temperature and relative intensity noise (RIN) below -145dB/Hz, suitable for 100Gb/s per lane data transmission. The VCSEL’s 940nm center wavelength is within the wavelength range directed by IEEE 802.3 VR4 and offers the advantages of higher differential gain and lower thermal impedance. Large-signal performance at 100 Gb/s as well as device reliability will also be presented.
This paper reviews the VCSEL technology used to enable 100 Gb/s multi-mode optical links. Link performance, device characterization over temperature and wear-out lifetime will be presented. The manufacturability of these high performance and reliable VCSELs will be discussed.
This paper will review the VCSEL performance requirements and link length limitations to support next generation 53Gbaud line rates with PAM-4 modulation for 100G per lane multi-mode optical links for both active optical cables and transceivers. VCSEL performance with bandwidth in excess of 25GHz and relative intensity noise lower than -145dB/Hz will be needed to enable this next generation of multi-mode links. VCSEL device performance and associated wear out life data will be included.
This paper will review the device design and performance of Broadcom’s 50Gb/s PAM-4 VCSEL to enable the next generation of transceivers using a PAM-4 advanced modulation scheme at 25-28 GBd. The VCSEL has been optimized to minimize noise and improve dynamic performance for cleaner eyes. Preliminary wear out lifetime studies indicate that the time to 1% failure exceeds 10 years, making the VCSELs suitable for data communication applications.
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