System and method for 400G signal generation and coherent detection
US9793999B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2013 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Aug 15, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/01
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A novel digital signal processing scheme (DSP) for quadrature duobinary (QDB) spectrum shaped polarization multiplexed quadrature phase shift keying (PM-QPSK) based on multi-modulus blind equalizations (MMBE) is proposed and demonstrated with both simulation and experimental results. The key algorithms for this novel digital signal processing scheme include the cascaded multi-modulus algorithm (CMMA) for blind polarization de-multiplexing, multi-modulus QPSK partitioning frequency offset estimation (FOE) and two stage carrier phase recovery (CPR) with maximum likelihood phase estimation. The final signal is detected by maximum-likelihood sequence detection (MLSD) for data BER measurement. The feasibility of the proposed digital signal processing scheme is demonstrated by the experiment of 112 Gb/s QDB spectrum shaped PM-QPSK signal with a 25 GHz bandwidth waveshaper for Nyquist WDM channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.