Method for improving radio over fiber link performance

A technology of optical fiber radio and link performance, applied in the field of electronics, can solve complex and difficult to expand microwave frequency bands and other problems

Inactive Publication Date: 2012-07-25
YUNNAN UNIV
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Problems solved by technology

However, these methods are usually complex, employing additional optical modulators and l

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  • Method for improving radio over fiber link performance
  • Method for improving radio over fiber link performance
  • Method for improving radio over fiber link performance

Examples

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Embodiment Construction

[0104] Such as figure 1As shown, a dual-frequency RF signal is used to drive the polarization-dependent EAM. The bias voltage of the EAM is 1.45V. The CW laser is set to 1550.504nm, the line width is 800KHz, the optical power is 6.8dBm, and the relative noise intensity (RIN) is -150dB / Hz. The angles α and β of the two linear polarizers are set to 22.77°. The optical transmission adopts 20km SMF, the attenuation is 0.2dB / km, and the dispersion is 16ps / nm-km. Optical signal response rate is 0.62A / W, thermal noise is 10 -12 A / √Hz detected by the PIN photodetector. Simulation using commercial software VPI-TransmissionMaker 8.5, utilizing the EAM transfer functions extracted in Section II and Section IV. Considering that the transmission frequency is f 1 = 3.96GHz and f 2 = The optical carrier of the dual-frequency radio frequency signal of 3.964GHz, in order to match the frequency of the experimental analysis of Part IV. We simulated a RoF system transmitted through a 20...

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Abstract

The invention relates to a method for improving radio over fiber (RoF) link performance, which belongs to the technical field of electronics. According to the method, the RoF link performance is improved by a mixed-polarization electro-absorption modulator (EAM) or a mixed-polarization Mach-Zehnder modulator (MZM). The improvement is as follows: the mixed-polarization EAM or the mixed-polarization MZM is composed of a linear polarizer with an angle of alpha, an EAM or MZM and a second linear polarizer with an angle of beta; the two linear polarizers are respectively placed at the front end and the rear end of the EAM or the MZM; and the values of the alpha and the beta are related with the characteristics of the modulators. The method has the following advantages: (1) third-order non-linear and second-order non-linear distortions can be inhibited, and the SFDR (spurious-free dynamic range) is improved by more than about 12dB for a 20km optical fiber transmission RoF system using the mixed-polarization EAM and is improved by about 12dB for the 20km fiber transmission RoF system using the mixed-polarization MZM; and (2) through an OFDM UWB (orthogonal frequency division multiplexing ultra wide band) signal test, the EVM (error vector magnitude) is improved by 3dB by using the mixed-polarization EAM and is improved by 8.7dB by using the mixed-polarization MZM.

Description

Technical field: [0001] The invention relates to a method for improving the performance of an optical fiber radio link, which belongs to the field of electronic technology. Specifically, it relates to a method for improving system performance by using a mixed-polarization electro-absorption modulator or a mixed-polarization MZM to suppress nonlinearity (such as third-order intermodulation distortion). Background technique: [0002] Radio over Fiber (RoF) is a key technology for future transmission of high-capacity wireless signals covering large areas. However, there are many technical hurdles to overcome, such as the nonlinear distortion introduced by the transmission response of the optical modulator. The non-linear response creates harmonic and intermodulation distortion which, if left unaddressed, can seriously degrade the performance of RoF transmission systems. External modulator such as LiNbO 3 Mach-Zehnder modulator (MZM) and electro-absorption modulator (FAM) are...

Claims

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Application Information

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IPC IPC(8): H04B10/135H04B10/155H04B10/158H04B1/719H04B10/2507H04B10/2575
Inventor 张秀普申东娅徐杰余江邓世昆
Owner YUNNAN UNIV
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