In-phase and quadrature pattern alignment for quadrature phase shift keying optical transmitters
US8428183B2 · kind B2 · utility
8Cited by
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19Claims
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Key dates
| Filing date | Apr 1, 2011 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Jul 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/364
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include pseudorandom streams of ones and zeroes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.