Generating higher-level quadrature amplitude modulation (QAM) using a delay line interferometer and systems and methods incorporating same
US8805204B2 · kind B2 · utility
2Cited by
7References
6Claims
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Key dates
| Filing date | Feb 23, 2011 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Mar 18, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/541
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In general, optical communication systems and methods may generate higher-level nmQAM from nQAM signals using one or more delay line interferometers (DLIs) arranged in various configurations. The nQAM signals may be generated by a lower-level modulator, such as a BPSK modulator, QPSK modulator or lower-level QAM modulator, with binary driving signals. Different parameters of the DLIs, such as free spectral range (FSR), phase shift, and amplitude imbalance, may be selected to accomplish the desired higher-level nmQAM depending upon the nQAM signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.