Undertrykkelse af Raman-effekten ved polarisationsmodulation

摘要

The system ensures a reduction in Raman effect energy losses. The system for optical fibre transmission of signals without repeaters provides a method of scrambling the polarisation of the light waves injected into the system. The scrambling system may scramble the polarisation of the waves carrying information, or may scramble the polarisation of the optical pumping waves. The scrambling may happen in either the time frame or the spatial frame, and may be applied at high frequency or at low frequency. This may be achieved with a passive birefringent element. This technique has the effect of limiting the transfer of energy by the Raman effect, and allows an increase the power which may be injected into a link.