高盛：日本科技_光学时代_技术变革受益者；SEI 评级上调至买入，古河电工评级上调至中性

Investment Rating - The report upgrades Sumitomo Electric Industries (SEI) to Buy from Neutral, and Furukawa Electric to Neutral from Sell [1][39] Core Insights - The industrial electronics sector is experiencing increased demand for optical products driven by generative AI and data centers, leading to significant capacity expansion investments [2] - The report highlights the shift towards medium-distance data center interconnections (DCI) due to land and power constraints, creating additional demand for optical fiber products [17] - SEI is expected to see a substantial increase in profit contribution from its infocommunications business, which is projected to rise from 6% in FY3/25 to approximately 20% in FY3/28 [41][43] Summary by Sections Market Trends - Demand for optical products is significantly exceeding supply, prompting companies to invest in capacity expansion [2] - The emergence of projects like Stargate in the US, Japan, and UAE is expected to sustain high levels of investment in data center construction [2] Company Performance - SEI's operating profit estimates for FY3/26-FY3/28 have been raised by 11%/11%/12% due to increased demand for optical products [51] - Furukawa Electric is expected to benefit from marginal profit growth due to rising demand for its products [1] Financial Estimates - New sales and operating profit estimates for SEI show a 4% increase in sales for FY3/26, FY3/27, and FY3/28 [11] - The target price for SEI has been raised to ¥4,300 from ¥2,800, reflecting the expected growth in the infocommunications segment [54][55] Competitive Landscape - SEI holds a significant market share in ultra-high density optical fiber cables, estimated at around 50% globally [48] - The report notes that Fujikura and SEI are leading in ultra-multi-core optical fiber cables and optical connectors, while Furukawa Electric is attempting to catch up through acquisitions [9]