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Radio over fibre system

A wireless system and light-carrying technology, applied in fiber optic radio, phase-modulated carrier system, transmission system, etc., can solve the problems of millimeter wave instability, complex and expensive systems, etc., and achieve the effects of simplified structure, reduced cost, and easy commercialization

Inactive Publication Date: 2011-11-23
DONGHUA UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, multiple two-electrode Mach-Zehnder modulators are generally used for the generation of downlink 40GHz millimeter waves or simply only one. The former system is complex and expensive, while the latter system is greatly simplified, but the millimeter waves generated by the system are unstable.

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  • Radio over fibre system
  • Radio over fibre system
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Embodiment Construction

[0013] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0014] Embodiments of the present invention relate to a wireless over optical system, such as figure 1 As shown, it includes a central station 1 , a base station 2 and a downlink optical fiber 3 , and the central station 1 and base station 2 are connected through the downlink optical fiber 3 .

[0015] The central station 1 includes a laser 11 connected in series with an optical fiber, a first Mach-Zehnder (MZM-1) modulator, a...

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Abstract

The invention relates to a radio over fibre system, comprising a central station, a base station and a downlink link fibre. The central station comprises a laser, a DQPSK (Differential Quadrature Reference Phase Shift Keying) lithium niobate modulator and an erbium-doped fibre amplifier, which are connected in turn in series through an optical fibre. The DQPSK lithium niobate modulator is in a push-pull mode and used for generating quadruple harmonic wave including a cosine microwave signal and OFDM-QPSK (Orthogonal Frequency Division Multiplexing-Quadrature Reference Phase Shift Keying) data information side frequency component carried by the quadruple harmonic wave. By adjusting bias voltage, the base station can obtain a local oscillation signal for uplink receiving demodulation and a millimetre wave signal in required power and carrying the OFDM-QPSK data information and send the obtained millimetre wave signal through an antenna. In the invention, the DQPSK lithium niobate modulator composed of three Mach-Zehnder modulators is adopted to generate steady millimetre waves; an optical filter is saved; the structure is simplified; the cost is reduced; and the system is easy to realize commercial applications.

Description

technical field [0001] The present invention relates to the field of optical wireless communication, in particular to an optical optical wireless system. Background technique [0002] With the further development of wireless communication towards high-speed networks, limited spectrum resources and limited transmission distance severely limit the development and application of wireless communication technology; GHz millimeter waves require high economic costs, and millimeter waves near 40 GHz are not suitable for transmission in coaxial cables or in the atmosphere. Therefore, in recent years, people gradually consider comprehensively utilizing the respective advantages of optical communication and wireless communication to overcome the above-mentioned problems in order to realize the integration of optical communication and wireless communication, which will become the development direction of future communication. [0003] In order to realize the Gbit / s communication system...

Claims

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Application Information

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IPC IPC(8): H04B10/12H04L27/26H04L27/20H04B10/2575
Inventor 陈翔陈小立
Owner DONGHUA UNIV
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