Market Overview - The Shanghai Composite Index experienced fluctuations throughout the day, while the ChiNext Index saw a rise followed by a decline. The coal and gas sectors continued to surge, with multiple stocks such as Zhengzhou Coal Electricity and Guo Xin Energy hitting the daily limit. The trading volume reached 1.75 trillion yuan, a decrease of over 200 billion yuan compared to the previous trading day [1]. Hot Topics Cultivated Diamonds - The cultivated diamond sector saw significant gains in the afternoon, with stocks like Hengsheng Energy, Sifangda, and Huanghe Xuanfeng hitting the daily limit. This surge was catalyzed by the announcement from the Ministry of Commerce and the General Administration of Customs regarding export control measures on superhard materials, effective from November 8 [4]. Coal Sector - The coal sector experienced a substantial rise, with stocks such as Dayou Energy and Antai Technology achieving consecutive daily limits. The latest report indicated a notable increase in port coal prices, with the price of thermal coal at northern ports rising to 748 yuan per ton, an increase of 39 yuan per ton week-on-week [7]. Optical Communication - The optical communication sector rebounded, with stocks like Cambridge Technology and Huylin Ecological hitting the daily limit. Recent research indicated that the optical module and PCB indices had adjusted for 13 trading days, with declines of 17% and 16%, respectively. Citigroup noted potential upward demand for optical modules, predicting a rise in industry demand from 8 million units to over 20 million units by 2026 [9][10]. Stock Performance Cultivated Diamonds - Hengsheng Energy (605580.SS) closed at 30.03 yuan, up 10.00% with a market cap of 8.408 billion yuan. Sifangda (300179.SZ) rose by 19.98% to 14.05 yuan, with a market cap of 5.277 billion yuan. Huanghe Xuanfeng (600172.SS) increased by 10.00% to 6.38 yuan, with a market cap of 8.143 billion yuan [5]. Coal Stocks - Dayou Energy (600403.SS) closed at 7.26 yuan, up 10.00%, with a market cap of 17.357 billion yuan. Antai Technology (600408.SS) rose by 10.10% to 3.27 yuan, with a market cap of 3.292 billion yuan. Zhengzhou Coal Electricity (600121.SS) increased by 10.10% to 5.45 yuan, with a market cap of 6.640 billion yuan [8]. Optical Communication Stocks - Cambridge Technology (603083.SS) closed at 108.25 yuan, up 10.00%, with a market cap of 29.013 billion yuan. Huylin Ecological (001267.SZ) rose by 10.02% to 16.25 yuan, with a market cap of 9.850 billion yuan. Ruisi Kanda (603803.SS) increased by 9.99% to 8.92 yuan, with a market cap of 3.790 billion yuan [10].

智通财经APP获悉，国盛证券发布研报称，光模块行业进入技术迭代与需求重构的关键期，800G仍是 主流产品，1.6T量产周期长于激进预期，CPO技术短期难替代可插拔方案，而无源器件市场正迎来价值 重估。国盛证券认为，当前产业链升级节奏回归2-3年迭代规律，二级市场需理性看待技术演进与业绩 兑现的匹配性，同时关注无源器件细分领域的高弹性机会。 国盛证券主要观点如下： 本轮光模块板块自5月初以来强势反弹 5月6日至9日，通信设备ETF(159583)上涨6.3%，新易盛(300502)涨超20%，中际旭创(300308)和天孚通 信(300394)分别涨超13%与8%，仕佳光子(688313)亦有12.7%的优异表现，重新出现了主流资金的回 归。在光模块经历了两轮牛市后，有哪些框架需要修正、祛魅?本报告围绕四大思考维度深入复盘：一 是产品迭代节奏回归常识;二是CPO技术的定位与可插拔方案共存;三是下游无源器件的价值被低估;四是 行业格局与卡位逻辑。通过论证，该行认为，当前估值与基本面双修复，正值布局良机。 1、400G、800G、1.6T一年一代?——快进的升级迭代回归常识 光模块800G仍是主流，1.6T趋势确定 ...