Soliton pulse transmission over waveguide fiber lengths

摘要

The invention proposes to increase the signal/noise ratio in a long-haul transmission system by:filtering noise (1) outside the range of wavelength of the signals transmitted,shifting (2) the wavelength of the signals transmitted, andfiltering the signals transmitted (5) that have undergone wavelength shifting.The wavelength of the signals can be shifted by widening the spectrum of the signals or by optical phase conjugation.