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Fiber optic transmission distance sets a world record: 500 high-definition movies can be transmitted in one second

Fiber optic transmission distance sets a world record: 500 high-definition movies can be transmitted in one second

2025-11-10
As reported by IT Home on November 4th, China Telecom officially announced today that it has joined hands with partners to deliver an "excellent achievement" in unrepeatered transmission. Leveraging hollow-core fiber technology, the collaboration has set two new world records for ultra-long single-span unrepeatered transmission in real-time systems: 800Gbps per wavelength and 1.2Tbps per wavelength, pushing the boundaries of "high-speed + long-distance" communication to a new level.


dernières nouvelles de l'entreprise Fiber optic transmission distance sets a world record: 500 high-definition movies can be transmitted in one second 0

China Telecom explained that in the past, achieving long-distance transmission of 800Gbps per wavelength required two remote-pumped amplifiers to reach 404km. To extend the distance by an additional 30km, a combination of "remote pumping + Raman amplifiers" was necessary, along with offline data processing using non-real-time algorithms.
However, in this latest breakthrough, China Telecom, together with Changfei, Huawei, and Guangdong University of Technology, achieved the following two records using only conventional EDFA optical amplifiers (Erbium-Doped Fiber Amplifiers, which use special optical fibers doped with erbium as "energy amplifiers"):
  • A real-time transmission of 800Gbps per wavelength over 611.9km — 174.2km longer than the previous real-time record, equivalent to a direct transmission from Beijing to Qingdao without any repeaters in between.
  • The world’s first unrepeatered transmission of a 1.2Tbps per wavelength real-time system over 200km (with an actual distance of 436.1km). This transmission speed is equivalent to transferring 500 high-definition movies per second, and achieving this over a distance of more than 400km marks a global first.
More importantly, hollow-core fiber previously gained attention for its "ultra-low latency", and this experiment directly confirms its potential for "ultra-long-distance high-speed transmission" — opening another door for the future of communications.
Note from IT Home: Hollow-core fiber (HCF) is based on an innovative air-guided light mechanism, which transmits light through air rather than glass. It can break through two major physical bottlenecks of solid-core fibers: capacity limits and latency limits. With significant performance advantages in backbone network and data center transmission, HCF is regarded as the next-generation optical communication technology.
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Created with Pixso. À la maison Created with Pixso. Le Blog Created with Pixso.

Fiber optic transmission distance sets a world record: 500 high-definition movies can be transmitted in one second

Fiber optic transmission distance sets a world record: 500 high-definition movies can be transmitted in one second

As reported by IT Home on November 4th, China Telecom officially announced today that it has joined hands with partners to deliver an "excellent achievement" in unrepeatered transmission. Leveraging hollow-core fiber technology, the collaboration has set two new world records for ultra-long single-span unrepeatered transmission in real-time systems: 800Gbps per wavelength and 1.2Tbps per wavelength, pushing the boundaries of "high-speed + long-distance" communication to a new level.


dernières nouvelles de l'entreprise Fiber optic transmission distance sets a world record: 500 high-definition movies can be transmitted in one second 0

China Telecom explained that in the past, achieving long-distance transmission of 800Gbps per wavelength required two remote-pumped amplifiers to reach 404km. To extend the distance by an additional 30km, a combination of "remote pumping + Raman amplifiers" was necessary, along with offline data processing using non-real-time algorithms.
However, in this latest breakthrough, China Telecom, together with Changfei, Huawei, and Guangdong University of Technology, achieved the following two records using only conventional EDFA optical amplifiers (Erbium-Doped Fiber Amplifiers, which use special optical fibers doped with erbium as "energy amplifiers"):
  • A real-time transmission of 800Gbps per wavelength over 611.9km — 174.2km longer than the previous real-time record, equivalent to a direct transmission from Beijing to Qingdao without any repeaters in between.
  • The world’s first unrepeatered transmission of a 1.2Tbps per wavelength real-time system over 200km (with an actual distance of 436.1km). This transmission speed is equivalent to transferring 500 high-definition movies per second, and achieving this over a distance of more than 400km marks a global first.
More importantly, hollow-core fiber previously gained attention for its "ultra-low latency", and this experiment directly confirms its potential for "ultra-long-distance high-speed transmission" — opening another door for the future of communications.
Note from IT Home: Hollow-core fiber (HCF) is based on an innovative air-guided light mechanism, which transmits light through air rather than glass. It can break through two major physical bottlenecks of solid-core fibers: capacity limits and latency limits. With significant performance advantages in backbone network and data center transmission, HCF is regarded as the next-generation optical communication technology.
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