China Mobile and industry partners commissioned what they said is the world's
first S+C+L three-band (shortwave S, conventional telecom C, longwave L)
ultra-low-loss multi-core optical cable in Qingdao, Shandong. Measured
performance exceeds current commercial networks: attenuation 0.189 dB/km,
inter-core crosstalk < -40 dB/100 km; dispersion and macro-bend loss meet
commercial standards, supporting longer, more stable transmission with minimal
channel interference.