OPTICAL FIBER TRANSMISSION SYSTEM WITH POLARIZATION MULTIPLEXING TO REDUCE STIMULATED BRILLOUIN SCATTERING

摘要

A technique for suppressing stimulated Brillouin scattering SBS along an optical fiber signal path utilizes polarization modulation at the transmitter to spl it the launched power into orthogonal polarization states. By reducing the power along each polarization, SBS will be reduced. Linewidth broadening of the optical sourc e is achieved by introducing: (1) a incoherence between the polarization states (using a time delay along the signal path of one polarization state); and (2) a frequency shift between the polarization states (using an acousto-optic modulator along the signal path of the remaining polarization state).