ITU-T G.652D is classified as low water peak or zero water peak single-mode fiber.

ITU-T G.652D is classified as low water peak or zero water peak single-mode fiber.

• A. True
• B. False
• C. Not a standard classification
• D. Both true and false

Answer: (A)

Water absorption in silica fibers comes from OH groups that cause a strong absorption peak around 1383 nm. That reduces performance for wavelengths in the region near that peak. ITU-T G.652D is defined as low water peak or zero water peak fiber, meaning the manufacturing minimizes hydroxyl content so the attenuation at 1383 nm is greatly reduced. That makes it possible to use channels in the region around 1380–1400 nm and to have more flexible DWDM deployment, while preserving good performance in the standard 1310 and 1550 nm windows. So the statement is true: G.652D is characterized as zero/low water peak fiber.

Water absorption in silica fibers comes from OH groups that cause a strong absorption peak around 1383 nm. That reduces performance for wavelengths in the region near that peak. ITU-T G.652D is defined as low water peak or zero water peak fiber, meaning the manufacturing minimizes hydroxyl content so the attenuation at 1383 nm is greatly reduced. That makes it possible to use channels in the region around 1380–1400 nm and to have more flexible DWDM deployment, while preserving good performance in the standard 1310 and 1550 nm windows. So the statement is true: G.652D is characterized as zero/low water peak fiber.