Group 1 - The core viewpoint of the article highlights the mixed performance of U.S. optical communication stocks on February 20, with some companies experiencing gains while others faced declines [1] Group 2 - Lumentum saw an increase of over 3% in its stock price [1] - Coherent experienced a rise of over 4% [1] - Credo Technology's stock declined by nearly 2% [1] - Lumen Technologies and Astera Labs both fell by over 1% [1]

Core Viewpoint - The optical communication sector in the U.S. stock market is experiencing an upward trend, with Lumentum reaching a historic high, indicating strong investor interest and potential growth in this industry [1] Group 1: Company Performance - Lumentum's stock increased by 5.5%, achieving a new all-time high, reflecting robust market confidence in its performance and future prospects [1] - Astera Labs, Coherent, and Ciena also saw stock price increases of 1%, suggesting a positive sentiment across the optical communication sector [1]