Patent ID: 9215116
Filing Date: 2015-12-15
Classification: H04B,H04L

Abstract:
1. A method for transmitting a binary digital transmit signal having a given bit interval over an optical transmission link, the method including: (a) creating a pre-coded digital signal by one of: (b) duobinary encoding the pre-coded digital signal into a differential duobinary signal; (c) applying the differential duobinary signal to modulate an optical light source of an optical modulator device having a predetermined optical wavelength to create a differential optical duobinary signal; (d) supplying the differential optical duobinary signal to a first end of the optical transmission link and transmitting the differential optical duobinary signal to a second end of the optical transmission link; (e) detecting the optical power of the differential optical duobinary signal at the second end of the optical transmission link to create a receive signal and processing the receive signal to create a binary digital receive signal corresponding to the binary digital transmit signal; (f) wherein the binary digital receive signal is created by, (g) wherein the receive signal or the optical differential duobinary signal is low-pass filtered in such a way that the bandwidth of the respective low-pass filtered signal is within the range of 0.25 to 0.35 times the bit rate of the binary digital transmit signal.