Huawei Technologies Co., Limited

Liang Zhang

Enbo Zhou

Tianjian Zuo

Nebojsa Stojanovic

Changsong Xie

Jinlong Wei

Qiang Zhang

Cristian Prodaniuc

An optical communication system that comprises a transmitter adapted to generate a signal by modulating a transmission data as low power consumption symbols of an amplitude modulation format and a monitoring data (MD) as high power consumption symbols of the amplitude modulation format, the MD comprising at least one transmitter parameter and/or at least one receiver parameter of communicating the transmission data. A binary logarithm of a total number of the low power consumption symbols and the high power consumption symbols is a non-integer.

Auxiliary channel in PAM/QAM systems using redundant constellation points

Embodiments of the present disclosure disclose a signal modulation and demodulation method and system, and an apparatus, to eliminate SSBI generated in a modulation and demodulation method. The method includes: performing, by a transmit end, PAM encoding on an input signal to obtain a PAM signal; electrically modulating, by the transmit end, the PAM signal by using a first filter; converting, by the transmit end, the electrically modulated PAM signal into an analog signal; optically modulating, by the transmit end, the analog signal by using an electro-optic modulator to obtain an optical signal, and sending the optical signal. Another method includes receiving, by a receive end, the optical signal, and converting the optical signal into an electrical signal; electrically demodulating, by the receive end, the electrical signal by using a second filter; and performing PAM decoding, by the receive end, the electrically demodulated electrical signal to obtain a restored input signal.

Signal modulation and demodulation method and system, and apparatus

An optical signal processing method and a coherent receiver, wherein an in-phase signal XI in a first polarization direction and an in-phase signal YI in a second polarization direction are added up to obtain a signal I; a quadrature signal XQ in the first polarization direction and a quadrature signal YQ in the second polarization direction are added up to obtain a signal Q; and quantization, combination, and digital signal processing are performed on the I and the Q. After summation, two signals need to be quantized. Therefore, a quantity of ADCs is reduced by half. In addition, because power consumption of a summation component is less than that of an ADS, power consumption of optical signal processing can be reduced. In addition, because there is a preset value, the summation may be performed after phase-inversion is performed on one analog signal, thereby avoiding a signal loss caused by the summation.

Optical signal processing method and coherent receiver

The present invention discloses a digital signal processor, including: a signal generation unit, configured to generate a first digital signal and a second digital signal; a first modulation unit, configured to modulate the first digital signal to obtain a third digital signal; a second modulation unit, configured to modulate the second digital signal to obtain a fourth digital signal; a first phase shifting unit, configured to perform phase shifting on the third digital signal, to output the third digital signal and a fifth digital signal; a second phase shifting unit, configured to perform phase shifting on the fourth digital signal, to output the fourth digital signal and a sixth digital signal; an adder, configured to calculate a sum of the third digital signal and the fourth digital signal, to obtain a seventh digital signal; and a subtractor, configured to subtract the sixth digital signal from the fifth digital signal.

Growing community of inventors

Munich, Germany

Liang Zhang