Optical transmission system, optically branching apparatus and optical signal processing apparatus
US6327060A · kind A · utility
48Cited by
3References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 4, 1998 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Mar 4, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/078
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an optical transmission system, an optical transmission line has up and down systems and loops back a supervisory light between the up and down systems. Trunk stations are provided at both ends of the optical transmission line and one or more optically branching units are provided in the optical transmission line for add/dropping a specific wavelength respectively. A branch station is connected to each of one or more the branching units. A bypass line for bypassing the supervisory light is provided in each of the one or more optically branching units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.