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Balanced photoelectric detection method and system capable of eliminating beat interference between signals

A technology of beat frequency interference and photoelectric detection, which is applied in the field of optical communication, can solve problems such as aggravated impact on system performance, insufficient power cost, and system complexity, and achieve the effects of low line width requirements, simple receiver, and improved spectral efficiency

Active Publication Date: 2013-11-27
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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AI Technical Summary

Problems solved by technology

Reducing GB in SSB-OOFDM can improve the SE of the system, but with the reduction of GB, the impact of SSBI on system performance will be intensified
Although some solutions to reduce the impact of SSBI on system performance have also been proposed, there are still deficiencies in system complexity and power cost

Method used

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  • Balanced photoelectric detection method and system capable of eliminating beat interference between signals
  • Balanced photoelectric detection method and system capable of eliminating beat interference between signals
  • Balanced photoelectric detection method and system capable of eliminating beat interference between signals

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] figure 1 It is a block diagram of the receiving system of this embodiment.

[0025] The system includes:

[0026] Here, the demultiplexing device adopts a wavelength interleaver (interleaver, IL), and the frequency characteristic is steep enough to achieve better separation of the optical carrier frequency component and the optical OFDM signal frequency component from the received SSB-OOFDM signal, and output to the optical coupler.

[0027] Here, the demultiplexing device uses a 2×2 3dB optical coupler, and its transmission matrix can be expressed as

[0028] T = 2 2 1 j ...

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Abstract

The invention provides a balanced photoelectric detection method and system capable of eliminating beat interference between signals. Light carrier waves and light OFDM signals in received SSB-OOFDM signals are separated during a partial wave period, the light carrier waves and the light OFDM signals are coupled again through a 3dB 2*2 optical coupler, appropriate dependency is introduced between the light carrier waves and the light OFDM signals, photoelectric balanced detection is conducted on the coupling output, the two paths of signals are converted into electrical signals and are subtracted in the electric field to obtain output electric OFDM signals, the electric signals only have OFDM radio-frequency signal parts, and no SSBI interference is introduced. According to the balanced photoelectric detection method and system capable of eliminating beat interference between the signals, receiving of SSBI and direct current components can be achieved, the necessity of setting frequency band protective intervals due to the SSBI is theoretically eliminated, and the frequency spectrum utilization efficiency of a SSB-OOFDM system can be improved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to the problem of eliminating beat frequency interference between signals in the detection process of SSB-OOFDM signals with smaller wavelength guard intervals and the problem of improving spectrum efficiency in the SSB-OOFDM system. Background technique [0002] At present, Optical Orthogonal Frequency Division Multiplexing (O-OFDM) technology based on high-order QAM modulation has attracted extensive attention because of its extremely high spectrum utilization and high tolerance to optical signal dispersion. Although the coherent optical OFDM (CO-OFDM) system can achieve 14bit / s / Hz spectral efficiency (Spectral Efficiency SE), the CO-OFDM system is sensitive to frequency offset and phase noise, and requires the laser linewidth of the transmitting end and receiving end Extremely narrow, which makes the design of the CO-OFDM sending and receiving system very complicated. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 马健新
Owner BEIJING UNIV OF POSTS & TELECOMM
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