Multi-core self-coherence homodyne transmission method and device for PON (Passive Optical Network) system

Abstract

The invention relates to a multi-core self-coherence homodyne transmission method and device for a PON system, and relates to the technical field of communication, and the method comprises the steps: dividing a group of initial optical carrier signals with multiple wavelengths into two paths which are respectively used as a demodulation light source of a receiving end and a modulation carrier of a transmitting end; after PAM4 modulation and Alamouti coding are carried out on data to be transmitted, a dual-polarization modulator is used for modulating the filtered modulation carrier wave with the required wavelength, and a dual-polarization modulation signal is obtained; the method comprises the following steps: receiving a dual-polarization modulation signal, filtering out a light source matched with the carrier wavelength of the dual-polarization modulation signal as a demodulation light source by adopting an optical filter, and demodulating to obtain a polarized I-path signal and a polarized Q-path signal; and after analog-to-digital conversion is performed on the I-path signal and the Q-path signal, digital signal processing is performed to obtain recovery data. According to the invention, the coherent receiving structure is simplified while the high speed and high sensitivity of the transmission work are ensured, the complexity of the DSP is reduced, and the power consumption is saved.

Description

technical field [0001] The present application relates to the field of communication technology, and in particular to a multi-core self-coherent homodyne transmission method and device for a PON system. Background technique [0002] With the exponential increase in bandwidth demand for new services such as high-definition video applications and cloud networks, Passive Optical Network (PON) is recognized as the most promising broadband optical access technology. With the development of PON to 50Gb / s / λ and above, intensity modulation and direct detection technology are limited by factors such as poor receiver sensitivity, high speed and power fading caused by dispersion under long transmission distance. Coherent detection is an effective method to improve the sensitivity of the receiver, and uses digital signal processing technology to realize various compensations after the received signal is converted to the digital domain. In addition, ultra-dense wavelength division multi...

AI Technical Summary

Problems solved by technology

However, the polarization-independent coherent detection scheme of the Alamouti code needs to use two polarizations to transmit data, and cannot use one of the polarizations to transmit the carrier pilot like most polarization multiplexing SHCD systems

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