TAILIEUCHUNG - Dramatic Attenuation in Fiber Access Terminals at Low Temperatures

It is common in applications where access terminals are used to terminate only a portion of the fibers brought into the enclosure–allowing the remainder of the fibers to pass through. When loose tube cable is used, the sub-units that are not terminated are "expressed" through, and the sub-unit material is not opened at any point. To provide customers with adequate sub-unit length for splicing under all conditions, ADC specifies a mid-span access length of 150" to 170". Testing of the enclosure with expressed sub-units of this length alerted ADC to potential low temperature issues | OmniReach FTTP Solutions white paper Dramatic Attenuation in Fiber Access Terminals at Low Temperatures The Situation It is common in applications where access terminals are used to terminate only a portion of the fibers brought into the enclosure-allowing the remainder of the fibers to pass through. When loose tube cable is used the sub-units that are not terminated are expressed through and the sub-unit material is not opened at any point. To provide customers with adequate sub-unit length for splicing under all conditions ADC specifies a mid-span access length of 150 to 170 . Testing of the enclosure with expressed sub-units of this length alerted ADC to potential low temperature issues. While there are no written standards governing this application ADC has concluded that in some - but not all - cases loose tube OSP cable dielectric or armored can experience excessive attenuation loss at low temperatures 0 C to -40 C . Subsequent research also reveals that the issue becomes more severe for cables exposed to initially high temperatures greater than 50 C prior to their exposure to low temperatures. Attenuation loss can be as high as 10 to 20 dB in extreme cases. After identifying the problem ADC proactively began researching the probable cause and discovered information from a 1998 Bellcore white paper that outlined similar problems with certain fibers in varying temperature environments. The paper entitled Time- and TemperatureDependent Material Behavior and Its Impact on Low-Temperature Performance of Fiber Optic Cables by Osman S. Gebizlioglu seemed to address the very issue ADC was observing in several of its own case studies. According to the paper a series of service-affecting field failures in cold weather -40 degrees C to 0 degrees C initially and in more moderate conditions up to 15 degrees C recently have raised concerns about the temperature-dependent transmission performance of loose tube fiber optic cables. The effect was transmission loss resulting

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.