OPTICAL LINE WAVELENGTH MEASUREMENT SYSTEM AND OPTICAL TEST DEVICE

摘要

PROBLEM TO BE SOLVED: To remotely measure an optical signal wavelength of each ONU having a continuously varying transmission wavelength in a TWDM-PON system.SOLUTION: In an optical test device targeted at a TWDM-PON system in which an OLT is connected to a plurality of optical wavelength variable ONU with a branching optical transmission line, an optical signal transmitted from each ONU destined to the OLT is branched from the optical transmission line and input, so that an input optical signal wavelength is measured. Then, an error in a set transmission wavelength of each ONU is detected.