Optical transmission device and optical communication system
AssigneeNEC Corporation
InventorKazuhiro Ootaki
Life of this patent
Estimating the term…
Abstract
An optical transmission device and an optical communication system being capable of coping with various installation forms of a transponder in a unit of optical fiber transmission path are provided. The optical transmission device is installed inside a station building. First and second interface units are connected to first and second fiber transmission paths accommodated in a submarine optical fiber cable. A first fiber transmission path mediates an optical signal to be transmitted between the first interface unit and a first transponder. A second fiber transmission path mediates an optical signal to be transmitted between the second interface unit and a second transponder.
Claims8
An optical transmission device installable inside a station building and connectable to another station building via an optical fiber cable, the optical transmission device comprising:
- a plurality of interface units including first, second, and third interface units configured to respectively connect to mutually different first optical fiber transmission paths accommodated in the optical fiber cable;
- a second optical fiber transmission path configured to mediate an optical signal to be transmitted between the first interface unit and a first transponder installed inside the station building;
- a third optical fiber transmission path configured to mediate an optical signal to be transmitted between the second interface unit and a second transponder installed outside the station building;
- a dummy light output unit configured to output monitoring dummy light and a selection signal specifying a first optical fiber transmission path of the plurality of first optical fiber transmission paths to which monitoring dummy light is to be transmitted via a corresponding interface unit of the plurality of interface units;
- and
- a selection circuit switchably connected between the dummy light output unit and the plurality of interface units, the selection circuit configured to receive the selection signal from the dummy light output unit and in response transfer the monitoring dummy light from the dummy light output unit to the first optical transmission path specified in the selection signal via the corresponding interface unit, wherein
- a receiver provided in the another station building receives the monitoring dummy light and analyzes a transmission characteristic of the first optical fiber transmission path specified in the selection signal and through which the monitoring dummy light is transmitted.
An optical communication system comprising:
- an optical transmission device configured to be installed inside a station building and to be connected to another station building via an optical fiber cable;
- a first transponder configured to be installed inside the station building;
- and
- a second transponder configured to be installed outside the station building,
- wherein the optical transmission device includes:
- a plurality of interface units including first, second, and third interface units configured to respectively connect to mutually different first optical fiber transmission paths accommodated in the optical fiber cable;
- a second optical fiber transmission path configured to mediate an optical signal to be transmitted between the first interface unit and a first transponder installed inside the station building;
- a third optical fiber transmission path configured to mediate an optical signal to be transmitted between the second interface unit and a second transponder installed outside the station building;
- a dummy light output unit configured to output monitoring dummy light and a selection signal specifying a first optical fiber transmission path of the plurality of first optical fiber transmission paths to which monitoring dummy light is to be transmitted via a corresponding interface unit of the plurality of interface units;
- and
- a selection circuit switchably connected between the dummy light output unit and the plurality of interface units, the selection circuit configured to receive the selection signal from the dummy light output unit and in response transfer the monitoring dummy light from the dummy light output unit to the first optical transmission path specified in the selection signal via the corresponding interface unit, wherein
- a receiver provided in the another station building receives the monitoring dummy light and analyzes a transmission characteristic of the first optical fiber transmission path specified in the selection signal and through which the monitoring dummy light is transmitted.
Dependencies are inferred from the claim text.