An optical coupler device and an optical monitoring device for monitoring one or more optical point-to-point transmission links

摘要

The invention relates to an optical coupler device, especially for monitoring purposes in an optical point-to-point transmission link (1), comprising a first (13a), a second (13b) and a third (13c) optical port. The optical coupler device (13) is configured to transmit a first optical signal (S DS ) received at the first optical port (13a) to the second optical port (13b) and to transmit a second optical signal (S US ) received at the second optical (13b) port to the first (13a) and third (13c) optical port according to a monitoring split ratio with respect to the optical power of the second optical signal (S US ), the first (S DS ) and second (S US ) optical signal having a wavelength (» 1 , » 2 ) lying in a first optical band. The optical coupler device (13) is further configured to transmit a third (S mon ) and a fourth optical signal (S mon,r ) received at the third (13c) and the second (13b) optical port to the respective other optical port, the third (S mon ) and fourth (S mon,r ) optical signal having a wavelength (» 3 ) lying in a second optical band. According to the invention, the optical coupler device (13) configured to be controllable with respect to the monitoring split ratio and comprises a control means (19) adapted to receive a control signal. The control means (19) is configured to control the optical coupler device (13) with respect to the monitoring split ratio in such a way that in a first work the second optical signal (S US ) is transmitted to the first optical port (13a), only, and in a second work mode a major portion of the optical power of the second signal (S US ) is transmitted to the first optical port (13a) and a minor portion of the optical power of the second signal is (S US ) transmitted to the third optical port (13c). The invention further relates to a monitoring device for monitoring an optical point-to-point transmission link (1) or a plurality of optical point-to-point transmission links (1) comprising such an optical coupler device (13).