OPTICAL TRANSMISSION METHOD

摘要

PURPOSE:To form an optical transmission method in which a light source is used in the normal state, the deterioration in transmission quality due to the effect of a beat signal is suppressed and optical multiplexity is not reduced. CONSTITUTION:In the optical transmission method where two optical signals or over whose wavelength differs are sent through an optical fiber 1 through a multiplexing way, a shortest wavelength difference of the two optical signals or over is selected within a range of 0.2nm or over and 30nm or below, or 0.2nm or over and 1nm or below. A light source whose illuminance spectrum half width (beam width) is 10MHz or over and 100MHz or below is used for a light source 2 for an optical signal sent through the optical fiber 1. The optical signals whose wavelength differs sent from each of two terminal stations or over are coupled optically by the optical fiber 1 and the signals are sent through the fiber 1.