In system, bipolar digital data transmitted by use of wavelength-division multiplexing on single optical fiber. Two different wavelengths used to transmit pulses signifying "positive" or "negative" bipolar digital data. Simultaneous absence of pulses at both wavelengths signifies digital "zero."
Wavelength-Division Multiplexing Of Bipolar Digital Signals
NASA Tech Briefs ; 18 , 12
01.12.1994
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