Alternate mark/space inversion line code

Details Alternate mark/space inversion line code Alternate mark/space inversion line code

1987-08-04

1988-12-13

Miller, Charles D.

Coded data generation or conversion

Digital code to digital code converters

To or from nrz codes

455608, H03M 504

Patent

active

047914076

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.

REFERENCES:
patent: 3409875 (1968-11-01), De Jager et al.
patent: 3808366 (1974-04-01), Wanamaker et al.
patent: 3967062 (1976-06-01), Dobias
patent: 4052611 (1977-10-01), Fish
patent: 4475212 (1984-10-01), McLean et al.
patent: 4679252 (1987-07-01), Holland

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