Use of higher order modulation techniques to transmit large aggregate data rates on an optical link with relatively low speed electronics
US6522697B1 · kind B1 · utility
50Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0298
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Systems and methods that increase the maximum data rate capacity per optical carrier on an optical link. The present invention intensity modulates an optical carrier with one or more (microwave) carriers that have been higher order modulated (M-ary ASK, PSK, QAM, and the like) using bandwidth efficient modulation. Consequently, as the number of bits/symbol is increased, the bit rate increases without an increase in occupied bandwidth. Thus, 2 bit/Hz or more of optical channel bandwidth may be transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.