SSB (Single Side Band)-OOFDM (Optical Orthogonal Frequency Division Multiplexing) link implementation method and system for beat interference cancellation

A technology of beat frequency interference and its implementation method, which is applied in the field of optical communication, and can solve problems such as wavelength sensitivity, steep filter edge, and reduced receiver sensitivity and power utilization

Active Publication Date: 2017-01-11
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

For example, a beat frequency interference cancellation receiver composed of an optical carrier suppression filter, a 1×2 optical coupler and a balanced detector improves the system’s tolerance to phase noise and fiber dispersion, but half the optical power It is used to suppress SSBI, but has no contribution to the received RF-OFDM signal, which reduces the sensitivity of the receiver and the power utilization o

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  • SSB (Single Side Band)-OOFDM (Optical Orthogonal Frequency Division Multiplexing) link implementation method and system for beat interference cancellation
  • SSB (Single Side Band)-OOFDM (Optical Orthogonal Frequency Division Multiplexing) link implementation method and system for beat interference cancellation
  • SSB (Single Side Band)-OOFDM (Optical Orthogonal Frequency Division Multiplexing) link implementation method and system for beat interference cancellation

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[0038] The invention provides a method and system for realizing an SSB-OOFDM link for eliminating beat frequency interference. The principle of system link and polarization orthogonal SSB-OOFDM signal generation and SSBI elimination are as follows figure 1 As shown, the specific implementation requires the following steps:

[0039] In the polarization orthogonal SSB-OOFDM signal transmitter, a pseudo-random sequence with a data rate of 40Gbit / s is generated through a baseband OFDM modulation module and a digital-to-analog conversion module to generate a bandwidth W S =10GHz I and Q two-channel 16-QAM baseband OFDM signal, mixed with the RF local oscillator signal through the I / Q modulator, and adjust the output frequency f of the RF local oscillator source RF It can generate frequency band RF-OFDM signals with a center frequency ranging from 5.1 GHz to 15 GHz. Frequency f c =193.1THz, output power of 0dBm, linearly polarized light from a continuous wave laser of 1MHz line width i...

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Abstract

The invention provides a DD (Direct Detection)-SSB (Single Side Band)-OOFDM (Optical Orthogonal Frequency Division Multiplexing) link implementation method and system for beat interference cancellation, and relates to the field of optical communication. In a DD-OOFDM system, a polarization modulator and an optical band-pass filter generate a cross-polarized SSB-OOFDM signal; the SSB-OOFDM signal is injected to a single side beat interference (SSBI) cancellation receiver (BICR) after optical fiber transmission, a polarization beam splitter (PBS) splits the cross-polarized optical carrier and OOFDM side band in the SSB-OOFDM signal into two linearly-polarized SSB-OOFDM signals, a balance photo-detector (BPD) performs photoelectric conversion, differential photocurrent output by a subtracter only contains an RF (Radio Frequency)-OFDM (Orthogonal Frequency Division Multiplexing) signal, while the SSBI component is completely canceled, so that the guard interval between the optical carrier and the OOFDM side band is greatly reduced and the spectral efficiency of the system is improved. The BICR has the advantages of simple structure, low cost and insensitivity to signal wavelength, and is significant for improving the performance of the DD-OOFDM system.

Description

technical field [0001] The present invention relates to the field of optical communication, in particular to optical polarization orthogonal single sideband (SSB) modulation technology in Direct Detection Optical Orthogonal Frequency Division Multiplexing (DD-OOFDM) system and inter-signal beat frequency interference elimination receiver based on balanced detection (BICR) structure, providing a SSB-OOFDM link implementation method and system with high system performance, low structural complexity, and low cost without inter-signal beat frequency interference (SSBI). Background technique [0002] In recent years, with the continuous improvement of global informatization, the demand of human society for information transmission capacity has grown at an alarming rate. In order to meet the requirements of the existing communication system for large bandwidth, people pay more attention to the optical network with high transmission capacity. However, with the continuous increase ...

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Application Information

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IPC IPC(8): H04B10/50H04B10/60H04L25/03
CPCH04B10/503H04B10/60H04L25/03343
Inventor 马健新张营
Owner BEIJING UNIV OF POSTS & TELECOMM
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