E is a single-mode optical fiber engineered specifically for ultra-long-haul and submarine networks. This is equivalent to 1% strain STL controls every stage of the manufacturing process so that quality is built in to every meter of fiber, rather than selected out at the end through testing. Sumitomo Electric. uous requirements for higher capacity optical transmission systems. To support these high capacity systems in terrestrial backbone networks, low attenuation and large core area fibers compliant with Recommendation ITU-T G 654. E were introduced and have been extensively deployed worldwide. E, allow for the provision of an additional network margin that can be leveraged to enable reliable, high-data-rate transmissions over longer spans and extended reach.
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