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Polarization-multiplexing-based method and device for modulating and directly detecting optical signals

A polarization multiplexing, optical signal technology, applied in the field of coherent optical communication, can solve the problems of low spectrum utilization, low system transmission performance, signal frequency selective fading, etc., to improve transmission performance, rational use, and avoid frequency selectivity fading effect

Active Publication Date: 2015-03-11
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to solve the problems that the existing direct detection system suffers from the influence of frequency selective fading caused by dispersion, low spectrum utilization rate and low transmission performance of the system

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  • Polarization-multiplexing-based method and device for modulating and directly detecting optical signals
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  • Polarization-multiplexing-based method and device for modulating and directly detecting optical signals

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiments of the present invention provide a method for optical signal modulation and direct detection based on polarization multiplexing, such as figure 1 As shown, the method includes the following steps:

[0026] Step 101. At the transmitting end, modulate the SSB radio frequency signal and the DSB baseband signal onto two mutually orthogonal optical carriers, that is, modulate to form a SSB optical signal in the X polarization direction, and modulate in the Y polarization direction A double sideband optical signal is formed.

[0027] figure 2 It is a schematic diagram of the optical signal spectrum at the sending end, such as figure 2 As shown, the single sideband radio frequency signal is modulated in the X polarization direction to form a single sideband optical signal (SSB signal), and the double sideband baseband signal ...

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Abstract

The invention discloses a polarization-multiplexing-based method and device for modulating and directly detecting optical signals. The method comprises the following steps: respectively modulating single side band radio-frequency signals and double side band baseband signals in an X polarization direction to form single side band optical signals, and modulating single side band radio-frequency signals and double side band baseband signals in a Y polarization direction to form double side band optical signals at a sending end; combining and outputting the single side band optical signals and the double side band optical signals by an optical coupler; directly detecting receiving signals at a receiving end by a photoelectric detector to obtain a hybrid frequency spectrum of the double side band optical signals and the single side band optical signals, then demodulating the hybrid frequency spectrum to obtain the single side band radio-frequency signals, reconstituting autodyne frequency components of the single side band optical signal by using the single side band optical signals obtained by demodulating, and separating the double side band baseband signals out of the hybrid frequency spectrum. By virtue of the polarization-multiplexing-based method and device for modulating and directly detecting optical signals, the whole frequency spectrum resource is reasonably used; the influence of frequency selective fading caused by chromatic dispersion of the double side band baseband signals is avoided; the transmission performance of the system is improved.

Description

technical field [0001] The invention relates to coherent optical communication, in particular to a method and device for optical signal modulation and direct detection based on polarization multiplexing. Background technique [0002] With the increasing development of optical communication, coherent optical transmission technology has made major breakthroughs in the direction of ultra-high speed, ultra-large capacity, and ultra-long distance. However, in terms of metropolitan area network transmission, due to the greatly shortened transmission distance, the cost of using coherent optical communication technology cannot be effectively reduced, and the low-cost characteristics of the direct detection system just meet the requirements of metropolitan area network transmission. The direct detection system only needs one photodetector to receive the signal at the receiving end, instead of the coherent receiver at the receiving end of the coherent optical communication, thus great...

Claims

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Application Information

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IPC IPC(8): H04B10/61
Inventor 黎偲杨奇胡荣
Owner WUHAN POST & TELECOMM RES INST CO LTD
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