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Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate

A polarization multiplexing and utilization technology, applied in polarization multiplexing systems, electromagnetic wave transmission systems, transmission systems, etc., can solve the problems of low frequency band utilization, high system noise, and high system bit error rate in RoF systems, and achieve improved frequency bands. Utilization, reduce system noise, increase the effect of system capacity

Inactive Publication Date: 2012-04-11
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the frequency band utilization rate of the existing RoF system is low, the system noise is large, and the system bit error rate is high

Method used

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  • Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate
  • Polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with high frequency spectrum utilization rate

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the examples.

[0020] A polarization multiplexed mmWave RoF system with high spectral efficiency, such as figure 1 As shown, it includes a central station 1, an uplink optical fiber 2-2, a downlink optical fiber 2-1 and a base station 3, and the central station 1 and the base station 3 pass through the uplink optical fiber 2-2, the downlink optical fiber 2-1 connect.

[0021] The downlink structure of the polarization multiplexing millimeter wave RoF system with high spectral efficiency:

[0022] The output end of the first laser 1-1 is connected to the input end of the two-electrode Mach-Zehnder modulator 1-3; one DC electrode of the two-electrode Mach-Zehnder modulator is connected to the output end of the bias voltage source 1-15, and the other The DC electrode is grounded, one RF electrode is connected to the output end of the radio frequency signal generator 1-2, the other RF electrode i...

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Abstract

The invention discloses a polarization multiplexing millimeter-wave radio-over-fiber (RoF) system with a high frequency spectrum utilization rate and relates to the field of RoF. By the system, the problems of low frequency band utilization rate, high noise and high bit error rate of the conventional RoF system are solved. In the system, a double-electrode Zehnder modulator is connected with inputs of a first laser, a radio frequency signal generator, a Pi phase shifter, a bias voltage source, the ground and a first 3dB coupler respectively; one output of the first 3dB coupler is connected with an emitting antenna through a first polarizer, a first strength modulator, a second 3dB coupler, an er-doped fiber amplifier (EDFA), a down link optical fiber, a third 3dB coupler, a first analyzer, a first photoelectric converter, a first filter and a millimeter-wave amplifier; and the other output of the first 3dB coupler is connected with a receiving antenna through a second analyzer, a second 3dB coupler, the EDFA, the down link optical fiber, a second photoelectric converter, a second filter and a multiplier. The polarization multiplexing millimeter-wave RoF system is mainly used for RoF systems with high frequency band utilization rate, low noise and low bit error rate.

Description

technical field [0001] The present invention relates to the technical field of wireless communication over optical fiber (radio-over-fiber, abbreviated as RoF), in particular to a polarization multiplexing millimeter wave RoF system with high frequency spectrum utilization. Background technique [0002] With the continuous development of communication services, it is required that the communication system can provide high-speed, high-reliability and ubiquitous multimedia services, making the communication system move towards wireless and broadband. Radio-over-fiber (radio-over-fiber, abbreviated as RoF, also known as optical fiber wireless communication) uses optical fiber as the transmission medium between the central base station (CS: Central Station) and the base station (BS: Base Station), directly using optical carrier Transmission of millimeter-wave signals, combined with optical fiber communication and wireless communication technology, fully utilizes the respective c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/12H04J14/06
Inventor 杨龙裴丽宁提纲李晶油海东陈宏尧李超
Owner BEIJING JIAOTONG UNIV
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