Configuring optical launch powers in optical fiber transmission lines
US7379647B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2005 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Apr 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2935
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method includes transmitting optical signals through a heterogeneous sequence of spans of an all-optical transmission line. Each span has an optical transmission fiber connected to an optical amplifier. Each amplifier launches the signals into a sequential remainder of the line. The transmitting includes launching the optical signals into the highest loss fibers with substantially equal average optical launch powers or operating the spans with the highest loss fibers to have substantially equal quality products. The average optical launch powers are substantially equal to the inverse of a sum of (1−Tj)γj/[φNL·αj] over the highest loss fibers. The parameters Tj, γj, and αj are the respectiveare, respectively, transmissivity, nonlinear optical coefficient, and loss coefficient of the fiber of the j-th span. The parameter φNL is the line's cumulative nonlinear phase shift. Each quality product is the per-span optical signal-to-noise ratio of the associated span times the nonlinear phase shift of the associated span.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.