Digital coherent optical receiver
US8331805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2010 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Jun 10, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/65
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital coherent optical receiver provided with a 90-degree optical hybrid circuit for detecting an in-phase signal and a quadrature signal of an input optical signal, includes first through fourth circuits. The first circuit calculates a square of a sum of the in-phase signal and the quadrature signal. The second circuit subtracts a squared value of the in-phase signal and a squared value of the quadrature signal from the calculation result of the first circuit. The third circuit detects a phase error of the 90-degree optical hybrid circuit based on the calculation result of the second circuit. The fourth circuit corrects at least one of the in-phase signal and the quadrature signal according to the phase error detected by the third circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.