Alternate mark/space inversion line code
US4791407A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Aug 4, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication system and method for transmitting information in the form of binary digital data to be transmitted is encoded into two separate two level sequences S1 and S2 such that the first occurrence of a logic "1" is encoded into the same level in both sequences and each subsequent occurrence of a logic "1" is encoded into the level opposite of the previous level representing a logic "1" in each of the sequences S1 and S2, and the first occurrence of a logic "0" is encoded into opposite levels in sequences S1 and S2 and every subsequent occurrence of a logic "0" is encoded into the level opposite of the previous level representing a logic "0" in each of the sequences S1 and S2. The two encoded streams drive optical signal producing means of respectively different wavelengths and the two optical signals are transmitted over a wavelength-multiplexed fiber-optic link. The receiving end of the link electro-optically converts the transmitted optical signals into electrical streams which are decoded using simple logic gates which extract both the original data and the synchronization clock digitally and without regard to the transmission rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.