A novel method for the measurement of chromatic dispersion in a single-mode optical fiber is proposed and demonstrated. This method adopts the technique of external modulation of the DFB laser output and direct optical frequency sweep range monitoring by coherent heterodyne detection.This method is also applicable to the future optical communication system with narrow-band optical elements such as optical amplifiers whereas measurement is impossible by the present state of the art.
Absfract-Polarization fluctuation characteristics of optical fiber submarine cables under 8000-m deep sea environmental conditions, optical fiber submarine cable coupling under periodic variable tension, and cable performance during and after installation are presented. As a worst case, it is demonstrated that the maximum frequency spectrum of polarization fluctuations is less than about 200 Hz under dynamic composite stress states. It is found that the polarization fluctuations of the optical fiber submarine cable coupling linearly change with periodic variable tensile forces. Also, it is confirmed that the power spectra of polarization fluctuations are less than 50 -60 Hz, and the maximum power spectra are between 5 and 10 Hz during the cable installation within a maximum cable tension of 18 kN (1.8 tons) and the cable laying speed of 3.5 knots, respectively.
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