Fiber-optic long-haul transmission system
US8139951B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jun 26, 2008 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Apr 21, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An ultra-long fiber-optic transmission system is configured in accordance with the current telecom standards and particularly advantageous for transmission data at a long distance which may exceed 400 km between adjacent nodes. The disclosed system has at least one intermediate amplifying node provided with a supervisory optical channel (SOC) which carries information between spaced nodes about the multi-wavelength optical signal as well as remote conditions at the optical terminal or regeneration site. The SOC comprises a transponder operative to select the direction in which an optical supervisory signal OSS, carrying information about the fiber break and malfunction of WDM channels, is transmitted along the SOC. The transponder further includes a receiver operative to measure the power of incoming OSS signal, which is indicative of the power of the transmitted and amplified WDM signal, and a Raman controller. The latter is coupled to the receiver and operative to either turn or turn off a pump of Raman amplifier based on determination of whether the measured power is lower than or at least equal to a reference value. The transponder is further configured with a transmitter confi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.