Alignment of in-phase and quadrature data in quadrature phase shift keying optical transmitters
US8644420B2 · kind B2 · utility
7Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2011 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | May 17, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/5561
- WIPO fieldTelecommunications
- 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 streams of alternating ones and zeroes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.