Research uncovers impairments in high-bandwidth fiber transmission networks

Research conducted by Fujitsu and Indiana University has detected some previously unseen glitches in fiber optic networks that could impair their ability to deliver ultra-rich broadband loads of 40 to 100 Gbps, the pair said in a news release.

According to the research, Polarization Dependent Loss (PDL) in fiber, which had been thought to be a minor impairment, "can actually have a significant effect on 40 Gbps and 100 Gbps transmission capability," the release said. Most carriers are either now using, or will shortly use fiber networks to deliver high-speed and bandwidth rich content that will be affected by this unforeseen impairment.

The university gave Fujitsu access to buried and aerial fibers to measure PDL in "a real-world setting" and establish a conclusion that "confirms the existent of Polarization Dependent Splice Loss (PDSL) ... and overall fiber connection loss to PDL," the two said.

For more:
- see this news release

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