Quadrature amplitude modulation (QAM) light vector signal production and distance heterodyne detection device
A technology for signal generation and heterodyne detection, applied in optical fiber transmission, optical fiber radio, multi-carrier systems, etc., can solve problems such as phase mismatch between light and signal light, and achieve the effect of avoiding complex processing
Inactive Publication Date: 2013-04-24
HUAZHONG UNIV OF SCI & TECH
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At present, the method of optical phase-locked loop is generally used to solve the problem of phase mismatch between intrinsic light and signal light.
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] The present invention provides a method for generating a QAM format optical signal in the range of optical frequency domain, and converting the QAM format optical signal in the range of optical frequency domain to the required electromagnetic wave frequency domain, including the millimeter wave frequency domain, through a remote heterodyne method; The remote heterodyne detection device can generate an electrical signal that directly generates the required frequency and then drives the antenna to generate electromagnetic waves of the same frequency. For example, the generation of millimeter w...
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The invention discloses a quadrature amplitude modulation (QAM) light vector signal production and distance heterodyne detection device. The device is composed of a sending device and a receiving device. On the sending side, a first Mach Zehnder modulator (MZM) modulates laser and microwave vibrating source and outputs an upper sideband light signal and a lower sideband light signal. The upper sideband light signal passes through a fiber bragg grating, and the lower sideband light signal passes through an optical band pass filter. Digital baseband signals are divided into two channels and are output by a vector waveform generator. A light modulation device modulates the upper sideband light signal output by the fiber bragg grating and outputs a QAM light signal with digital baseband information. A second optical coupler couples the lower sideband light signal and the QAM light signal into the optical fiber. According to the device, a QAM light signal within the range of light frequency domain is transferred into an expected electronic frequency domain by means of distance heterodyne, and an electromagnetic wave with original QAM signal is produced by an antenna. Therefore, the device can be applied to produce high-frequency millimeter waves, and the device has the advantages of simple implementation structure and low consumption.
Description
technical field [0001] The invention belongs to the technical field of optical wireless communication, and more specifically relates to a device for generating QAM optical vector signals and using a remote heterodyne detection device to generate electromagnetic waves of required frequency. Background technique [0002] Wireless communication has a high degree of flexibility, and optical communication has an unrivaled high bandwidth. Organically combining the advantages of wireless communication and optical communication when realizing the next generation of wireless access will undoubtedly meet the market demand. Therefore, fiber-borne wireless communication technology emerges as the times require, and optical-borne wireless communication is the fusion of optical communication and wireless communication. At present, the wireless frequency band below 5GHz is already very crowded. The wireless communication over optical technology mainly studies the use of electromagnetic wav...
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Login to View More IPC IPC(8): H04L27/36H04B10/50H04B10/64H04B10/2575
Inventor 单广军刘德明李劲朱光喜余宇马洪张伟谭力
Owner HUAZHONG UNIV OF SCI & TECH