Pulse quaternary communication means
US3956626A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1973 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Jun 14, 1993 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/532
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A pulse quaternary modulator especially to enable laser communication systems when working at high data rates to be able to operate on less laser power and on a modulation format that improves modulation efficiency. The subject modulation means can be used in transmitters and receivers and include means that make use of polarization changes in the modulator to create selective high speed electronically controlled optical time delays, and it also includes means for using a combination of polarization state and pulse position information to represent information choices. The subject means are also able to achieve M-ARY modulation when using as a source a mode-lock laser which produces output laser pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.