3results about "Optical transmission" patented technology

Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, a transmitter includes a laser operable to supply an optical signal, a digital signal processor operable to supply first electrical signals based on first data input to the digital signal processor and second data input to the digital signal processor, digital-to-analog conversion circuitry operable to output second electrical signals based on the first electrical signals, modulator driver circuitry is operable to output third electrical signals based on the second electrical signals, and an optical modulator operable to supply first and second modulated optical signals based on the third electrical signals. The first modulated optical signal includes a plurality of optical subcarriers carrying user data. The second modulated optical signal is polarization modulated based on the second data.

An optical signal transmission device and method based on digital predistortion in a symbol domain is provided. The optical signal transmission device includes: a memory; and a processor coupled to the memory to control execution of a process to: perform digital predistortion processing on a symbol sequence of a signal to be transmitted to obtain a digital predistortion processed signal; perform short-pulse shaping processing on the digital predistortion processed signal to obtain a short-pulse shaping processed signal, wherein a memory length introduced by the short-pulse shaping processing is less than or equal to a memory length of the optical transmitter; and generate and transmit an optical signal based on the short-pulse shaping processed signal.

Proposed is a technology for compensating for the performance of a transmitter using a pre-distortion method in an optical communication system, wherein a signal sending apparatus may include a transceiver, and at least one controller operably connected to the transceiver, wherein the at least one controller is configured to receive a digital signal, to modulate the digital signal into a PAM signal, to provide the PAM signal to a signal receiving apparatus, to obtain a distortion coefficient value from the signal receiving apparatus, to perform a nonlinear pre-distortion on PAM signals on the basis of the distortion coefficient value, and to provide a result signal generated on the basis of the nonlinear pre-distortion to the signal receiving apparatus.