Low-power pre-compensation of linear and nonlinear transmitter effects in narrow-spectrum optical signals
US11336367B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2021 |
| Grant date | May 17, 2022 |
| Priority date | — |
| Expiry date | Aug 30, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2507
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method performed at a transmitter comprises generating a set of digital signals representing a constellation point, each dimension of the point being uniquely represented by m bits, where mϵ{1, 2, 3}; applying a linear polyphase filter to a digital signal of the set, the linear polyphase filter pre-compensating for a linear transfer function of an electro-optic path of the digital signal and generating a first filtered signal having a roll-off factor α, where α is a positive real number satisfying α≤1; applying a nonlinear polyphase filter to the digital signal, in parallel to applying the linear polyphase filter to the digital signal, the nonlinear polyphase filter generating a second filtered signal representing nonlinear noise in the electro-optic path; calculating a pre-compensated digital signal from a difference between the first and second filtered signals; and transmitting an optical signal based on the pre-compensated digital signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.