Generating device and method for QPSK mm wave of radio frequency optical fibre transmission system

A technology of transmission system and radio frequency optical fiber, which is applied in the field of subcarrier multiplexing optical fiber communication system, which can solve the problems of low modulation depth, complex base station structure, nonlinear effect, etc.

Inactive Publication Date: 2007-10-03
SHANGHAI UNIV
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Problems solved by technology

However, these methods either require precise biased electro-optical modulators or precise coherent lasers or millimeter-wave local oscillator sources and mixers, resulting in a complex structure of the base station and high cost; or the structure of the base station is simplified, but the impact of fiber dispersion is more serious , the modulation depth is not high, there is nonlinear effect, or there is strong radio frequency reflection, and there is crosstalk to duplex work
Koonen.T. etc. provide a An optical multiplication 5.4GHz downlink structure, but the structure mentioned in the article is only suitable for generating lower frequency radio frequency carriers, not suitable for generating millimeter waves

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  • Generating device and method for QPSK mm wave of radio frequency optical fibre transmission system

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Embodiment Construction

[0058] A preferred implementation example of the present invention is a 60 GHz millimeter wave optical generation device and method applied to a high-speed data RoF system.

[0059] Referring to the accompanying drawings, the millimeter wave signal generating device is composed of a central station 1, an optical fiber line 2 and a base station 3, specifically:

[0060] 1) Set semiconductor laser 1-1, optical splitter 1-2, polarization controller 1-3, optical phase modulator 1-4, optical comb filter 1-5, polarization controller in the central station (1) 1-6, optical QPSK modulator 1-7, polarization controller 1-9 and optical combiner 1-10; the light wave output by the semiconductor laser 1-1 passes through the optical splitter 1-2 according to 2 : 1 splitting ratio is divided into two paths: one path enters the optical comb filter 1-5 through the polarization controller 1-3 and the optical phase modulator 1-4, and the other path passes through the polarization controller 1- 6...

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Abstract

A device used for generating QPSK millimeter wave of radio frequency optical fiber transmission system consists of semiconductor laser of central station, polarization controller, optical phase modulator, optical comb fiber, optical QPSK modulator, optical branching unit/combining unit, optical detector of base station, narrow band band-pass filter, millimeter wave amplifier and millimeter wave antenna. Its optical modulating method for obtaining QPSK modulated millimeter wave signal is also disclosed.

Description

Technical field: [0001] The invention relates to a device and method for generating a QPSK modulated 60GHz millimeter wave signal of a radio frequency optical fiber transmission system (RoF, Radio on Fiber), and the technical field belongs to a subcarrier multiplexing optical fiber communication system. The method features an optical generation method of QPSK millimeter waves. In the central station, the phase modulation of the light wave is completed with high-speed data according to the QPSK system, and the sine phase modulation light wave is used to excite the optical comb filter to generate the intensity change of the light wave. In the base station, the QPSK light wave is directly converted into QPSK millimeter wave. technical background: [0002] As a very competitive development direction of ultra-high-speed wireless communication network (the next generation of high-speed mobile communication and broadband wireless access network), the millimeter wave optical fiber ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/12H04B10/155H04B10/18H04B10/548
Inventor 林如俭修明磊叶家骏李迎春宋英雄邹君妮
Owner SHANGHAI UNIV
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