Equalizer for an optical transmission system
US9166703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2009 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Nov 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03133
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An equalizer (60) processes, in the electrical domain, a signal obtained from a path of an optical transmission system. The equalizer comprises N cascaded stages (where N≧1). At least one of the stages comprises a cascade of a linear equalization element (61) and a non-linear equalization element (62). The equalizer (60) is able to compensate for both linear impairments, such as dispersion, and non-linear impairments. The cascaded linear and non-linear elements can simulate the effect of signal propagation through a fiber which has the opposite propagation parameters (e.g. attenuation, dispersion, non-linearity) to those of the propagation path experienced by a signal in the transmission system. The non-linear equalization element (62) can be a non-linear phase rotator which rotates phase of an input signal proportional to the squared modulus of the input signal amplitude. The linear equalization element (61) can comprise a digital filter, such as an Infinite Impulse Response (HR) filter or a Finite Impulse Response (FIR) filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.