Optical transport system employing direct-detection self-coherent receivers and compatible transmitters
US10404400B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2017 |
| Grant date | Sep 3, 2019 |
| Priority date | — |
| Expiry date | Jun 9, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical WDM system configured to use direct detection of communication signals that is compatible with electronic CD compensation on a per-channel basis. In an example embodiment, to enable full (e.g., amplitude and phase) electric-field reconstruction at the receiver, the optical WDM system uses a carrier-frequency plan according to which the carrier-frequency comb used at one end of the WDM link and the carrier-frequency comb used at the other end of the WDM link are offset with respect to one another by one half of the bandwidth of an individual WDM component transmitted therethrough. This frequency offset places each local carrier frequency at a roll-off edge of the corresponding incoming data-modulated signal. As a result, the corresponding combined optical signal beneficially lends itself to direct detection that can be followed by full electric-field reconstruction using a known self-coherent Kramers-Kronig method and then by conventional electronic CD compensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.