Chinese researchers achieved a new milestone in fiber-optic technology, achieving ultra-fast data transmission over long distances without signal repeaters.
This is impressive! Our usual spans go to maybe 120 km at most if I use our strongest EDFAs. With those we can deal with around 30 dB of span loss, and most fibers we can rent have around 0.25 dB/km loss. Of course this is on classical single core fiber, we don’t use HCF yet.
I remember YOFC was also at last year’s ECOC, where they presented their support tube hollow core fiber concept, reaching 0.05 dB/km at some wavelengths. Here’s some slides I photographed.
You sound like you know what you’re talk7ng about. What does the span loss (db/km) actually mean? I am most curious about why its measured in db (I guess it gets done by that to represent the sum of the “intensity” of all waves across different wavelengths that falls of across longer distances). Also how much span loss do they have in this new experiment (if you know something like that)
To add at least one on-topic comment here:
This is impressive! Our usual spans go to maybe 120 km at most if I use our strongest EDFAs. With those we can deal with around 30 dB of span loss, and most fibers we can rent have around 0.25 dB/km loss. Of course this is on classical single core fiber, we don’t use HCF yet.
I remember YOFC was also at last year’s ECOC, where they presented their support tube hollow core fiber concept, reaching 0.05 dB/km at some wavelengths. Here’s some slides I photographed.
I watched those pictures load one row of pixels at a time for 2 minutes.
You sound like you know what you’re talk7ng about. What does the span loss (db/km) actually mean? I am most curious about why its measured in db (I guess it gets done by that to represent the sum of the “intensity” of all waves across different wavelengths that falls of across longer distances). Also how much span loss do they have in this new experiment (if you know something like that)