One of the two optical windows in an optical fiber where the glass is most transparent and efficient for transmission. See optical fiber.
"1550 nm." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/1550-nm>.
1550 nm. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/1550-nm
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