Broadcom(US:AVGO) GUOTAI HAITONG SECURITIES·2026-03-17 04:40Investment Rating - The report assigns an "Overweight" rating for the industry [5]. Core Insights - The global demand for AI computing power is continuously expanding, driving upgrades in network bandwidth, optical interconnects, and data center infrastructure. Key segments such as DSP, silicon photonics, high-speed PCBs, optical devices, and advanced packaging will continue to benefit [2]. - Broadcom has launched the industry's first 3nm 400G/channel PAM-4 DSP Taurus BCM83640, which can support 1.6T optical modules, providing a critical technological foundation for future 204.8T switching networks. The importance of the collaborative upgrade of DSP, optical modules, and switching architectures is further highlighted as AI cluster scales continue to expand [7][11]. - AT&T has announced a $250 billion investment over the next five years for fiber broadband, wireless networks, and satellite deployment to support data-intensive applications such as AI, cloud computing, and autonomous driving. This is expected to further drive demand for fiber networks, optical modules, switching devices, and high-speed interconnect technologies [8][11]. Summary by Sections Investment Highlights - The industry holding ratio is increasing, with valuations at historically high levels, reflecting upward expectations driven by the AI industry chain [28]. - AI is driving network upgrades, with strong overseas demand, and domestic core enterprises are expected to benefit significantly from the global infrastructure wave [30]. - A new generation of computing infrastructure is emerging domestically, with a fully localized industrial chain entering a new cycle [31]. Industry News - Broadcom has introduced the first 3nm 400G/channel optical PAM-4 DSP Taurus BCM83640, which supports 1.6T transceivers, laying the foundation for 204.8T networks to meet AI data center bandwidth demands [11]. - Coherent has launched the industry's first dual-laser QSFP28-DCO module, achieving single-fiber bidirectional 100G coherent transmission over distances of up to 300 km [12]. - LightSpeed Photonics has released the world's first solderable NPO interconnect technology, LightKonnect, achieving speeds of 400Gbps [12]. Market Performance - The communication sector saw a 0.17% increase from March 9 to March 13, with the investment portfolio's average stock rising by 0.72% during the same period [20]. - The report indicates that the optical communication sector is a key beneficiary of AI infrastructure, with strong growth in performance and market capitalization among leading companies [29].