Dynamic control of power loss in an optical fiber by contrapropagation of a supervisory channel

摘要

An optical system is dedicated to dynamically measuring power loss in an optical fiber (FO) having a first end (E1) and a second end (E2) respectively adapted to receive and to send primary optical signals. The system comprises injection means (3) adapted to inject supervisory signals into the second end (E2) of the optical fiber (FO) at a selected optical power and detection means (5) adapted to extract the supervisory signals at the first end (E1) of the optical fiber (FO) in order to determine their optical power and to deduce therefrom and from the selected optical power primary information representative of the optical power loss of the supervisory signals in the optical fiber (FO), and where applicable to compare the primary information to a value representative of a nominal power loss in the optical fiber (FO) in order to supply secondary information representative of a variation of the power loss in the optical fiber.