Does China Unicom use single-mode fiber

China Unicom's broadband fiber optic network primarily uses single-mode fiber, including advanced G.654.E low-loss, large effective area fibers.China Unicom has actively deployed single-mode optical fiber for its broadband and backbone networks, focusing on high-speed, long-distance transmission. Single-mode fiber features a narrow core, typically 8–10 microns, allowing only one mode of light to propagate, which minimizes signal dispersion and supports superior performance over long distances compared to multimode fiber . This makes it ideal for China Unicom's high-capacity and long-haul communication infrastructure. Specifically, China Unicom has tested and implemented G.654.E optical fiber, a single-mode fiber standard designed for ultra-low loss and large effective area, enhancing transmission performance in high-speed systems . Field tests in Xinjiang and Shandong demonstrated its adaptability to harsh environments, including deserts and snow-covered mountains, confirming its reliability for backbone networks . The G.654.E fibers used include low-loss large effective area fiber and ultra-low loss large effective area fiber, both optimized for long-distance, high-bandwidth applications . Single-mode fiber in China Unicom's network is typically paired with laser light sources at wavelengths such as 1310 nm and 1550 nm, which further supports long-distance, high-speed data transmission . This deployment ensures minimal signal attenuation and high integrity for broadband services, making it suitable for both urban and rural connectivity projects. In summary, China Unicom's broadband fiber optic infrastructure relies on single-mode fiber, particularly advanced G.654.E types, to achieve high-speed, long-distance, and reliable network performance across China .