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Polarization-independent pulse amplitude modulation signal coherent receiving method and system

A technology of pulse amplitude modulation and coherent reception, applied in electromagnetic receivers and other directions, can solve problems such as high cost, limited application, and complex structure of coherent receivers

Active Publication Date: 2019-12-03
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

This will cause the structure of the coherent receiver to be too complex, so that the cost is too high, which limits its application in PON

Method used

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  • Polarization-independent pulse amplitude modulation signal coherent receiving method and system
  • Polarization-independent pulse amplitude modulation signal coherent receiving method and system
  • Polarization-independent pulse amplitude modulation signal coherent receiving method and system

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Embodiment Construction

[0075] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0076] see figure 2 As shown, an embodiment of the present invention provides a polarization-independent method for coherently receiving a pulse amplitude modulated signal, the method comprising the following steps:

[0077] S1. Perform bipolar precoding on the pulse amplitude modulated PAM signal at the transmitting end to obtain a bipolar PAM signal, and then perform polarization time coding on the bipolar PAM signal to obtain two orthogonally polarized signals;

[0078] At the sending end, that is, the OLT (optical line terminal, optical line terminal) end, the traditional PAM signal is usually unipolar PAM due to intensity modulation, that is, the modulation signal d=[d 1 , d 2 ,...,d n-1 , d n ], n represents the time sequence number, which is a positive integer greater than 0, and the modulated signal satisfies dn ∈{0,1,2,...,M-1}, ...

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Abstract

The invention discloses a polarization-independent pulse amplitude modulation signal coherent receiving method and system, and relates to the field of optical access networks, and the method comprisesthe following steps: carrying out the bipolar precoding and polarization time coding of a pulse amplitude modulation PAM signal at a transmitting end, and obtaining two orthogonally polarized signals; and converting the two orthogonally polarized signals into two polarized optical signals, and coupling the two polarized optical signals to obtain a coupled optical signal; directly mixing the coupling optical signal with local oscillation light in an optical mixer, and converting by two balance detectors to obtain I and Q paths of current signals; converting the I and Q paths of current signalsinto digital signals and then carrying out digital signal processing to obtain synchronous receiving signals; performing channel equalization, polarization time decoding and bipolar decoding on the synchronous receiving signal so as to recover the PAM signal of the sending end. The architecture of the coherent receiving system can be simplified, and the cost of the coherent receiving system is reduced.

Description

technical field [0001] The invention relates to the field of optical access networks, in particular to a polarization-independent pulse amplitude modulation signal coherent receiving method and system. Background technique [0002] The rate of the next generation PON (Passive Optical Network, Passive Optical Network) will reach 25Gb / s, 50Gb / s or even 100Gb / s for a single wavelength. In high-speed PON, low-cost direct modulation direct detection (IM-DD) will face a series of problems, such as low receiving sensitivity, and the frequency introduced by dispersion when the baud rate is high and the transmission distance is long. Selective fading causes performance degradation and the like. As a technology widely used in long-distance high-speed optical transmission systems, coherent receiving technology can greatly improve the sensitivity of the receiver (thus increasing the split ratio and transmission distance), and due to its linear detection characteristics, it can effectiv...

Claims

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Application Information

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IPC IPC(8): H04B10/61
CPCH04B10/61
Inventor 李海波余少华李响罗鸣
Owner WUHAN POST & TELECOMM RES INST CO LTD
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