Bidirectional photonic radio frequency transmission system for self-heterodyne coherent detection and signal processing implementation method thereof

Abstract

The invention discloses a bidirectional photonic radio frequency transmission system for self-heterodyne coherent detection and a signal processing implementation method thereof. The transmission system comprises a CW laser, a downlink and an uplink, and key signals are mainly processed by adopting a high-frequency orthogonal MQAM-OFDM transmitter in the uplink and the downlink. The system and the method provide an efficient solution for future ultrahigh-speed coherent optical communication, photonic radio frequency fusion communication, ultrahigh-speed multi-channel MIMO wireless transmission and high-speed photonic radio frequency interconnection between base stations.

Description

technical field [0001] The patent of the present invention relates to the field of new generation information and communication technology, and specifically relates to a self-homodyne coherent detection two-way photon radio frequency transmission system and its signal processing implementation method. Background technique [0002] With the rapid development of information and communication technology (ICT), people are constantly making efforts and attempts in pursuit of ultra-large bandwidth and ultra-long-distance transmission. Coherent photonic communication can not only realize ultra-high-speed signal transmission, but also its coherent detection can improve the sensitivity of the receiver. Under the same optical communication conditions, the sensitivity of the coherent receiver is about 20dB higher than that of the ordinary receiver, which can reach the limit of shot noise High performance, so also increases the transmission distance of optical signal without repeater. ...

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Problems solved by technology

[0007] Chinese patent 201510903299.6 describes its system by passing "laser light waves with both linearly polarized light and circularly polarized light through a 1 / 4 wave plate to make it into circularly polarized light", which is obviously problematic. Furthermore, the " Achieving polarization-independent reception" is also problematic

[0008] (2) Chinese patent 201510903299.6 discloses "leaving a spectrum interval near the optical carrier" and "setting the signal of the subcarrier to 0 near the low frequency band (-5GHz to 5GHz)" are problematic

The spectral signal without the center sideband enters the "polarization multiplexing coherent receiver" and demodulates the reflected center sideband light wave. This is not called coherent detection, and this design is also impossible to achieve, which is contrary to the principle of coherent optical detection and demodulation.

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