Method of and device for performing bi-directional transmission using a single-wire

摘要

Two signal lights having different wavelengths are bidirectionally transmitted on an optical-fiber transmission-line (1). A Raman pump light source (6) generates a first Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the first signal light and without response to the second signal light. Another Raman pump light source (9) generates a second Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the second signal light and without response to the first signal light. The first Raman pump light and the second Raman pump light are differently injected from respective input/output terminals into the optical-fiber transmission-line (1) by optical combining and branching filters (2, 3). <IMAGE>