dark fiber

(1) Also known as "unlit fiber," it is optical fiber that is laid in the ground, but not used. During the late 1990s, so much fiber had been installed worldwide in anticipation of Internet demand that there is still a huge amount of fiber that has never been lit. The projected demand has also been curbed by the improvements in WDM technology, which allows more channels to be transmitted in a single fiber strand. Contrast with lit fiber.

(2) Optical fibers that are installed and sold to carriers and large businesses without any optical or electronic signaling in their path. The customer is responsible for adding the transmission system at both ends. See TONS.

单词	dark fiber
释义	dark fiber dark fiber Fiber-optic data transfer cable that has been installed but is carrying far less traffic than it has the capacity for. dark fiber dark fiber (1) Also known as "unlit fiber," it is optical fiber that is laid in the ground, but not used. During the late 1990s, so much fiber had been installed worldwide in anticipation of Internet demand that there is still a huge amount of fiber that has never been lit. The projected demand has also been curbed by the improvements in WDM technology, which allows more channels to be transmitted in a single fiber strand. Contrast with lit fiber. (2) Optical fibers that are installed and sold to carriers and large businesses without any optical or electronic signaling in their path. The customer is responsible for adding the transmission system at both ends. See TONS. ThesaurusSeetons
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