External-modulation radio-frequency optical transmission system
A transmission system and radio frequency optical technology, which is applied in the field of externally modulated radio frequency optical transmission systems, can solve the problems of mixing the second harmonic component of a single pilot signal and reducing the control accuracy of the modulator bias point, so as to avoid interference and increase control The effect of precision
Inactive Publication Date: 2015-04-29
CHINA AVIATION OPTICAL-ELECTRICAL TECH CO LTD
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Problems solved by technology
[0006] The purpose of the present invention is to provide an externally modulated radio frequency optical transmission system based on dual pilot automatic bias control, to solve the problem that the bias point of the external modulator in the externally modulated radio frequency optical transmission uses a single pilot signal to mix in a single pilot signal The second harmonic component itself, thereby reducing the problem of modulator bias point control accuracy
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[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0019] Such as figure 1 As shown, the externally modulated radio frequency optical transmission system of the present invention includes an external modulator, an optical splitter, a photodetector, a bandpass filter, a bias control single-chip microcomputer, a difference frequency circuit and a double pilot signal, and the input of the external modulator The output end of the external modulator is connected to the input end of the optical splitter, and one output end of the optical splitter is used to output the optical signal as the output end of the transmission system, and the output end of the optical splitter The other output terminal is connected with the input terminal of the photodetector, and the output terminal of the photodetector is connected with the input terminal of the band-pass filter, and the double pilot signal generates a...
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The invention relates to an external modulation radio-frequency optical transmission system, and belongs to the technical field of optical fiber transmission. The biasing of an external controller is controlled by a double-pilot signal; the output end of the double-pilot signal is connected with the input end of a differential frequency circuit and a reference signal is generated through the differential frequency circuit; the output end of the differential frequency circuit is connected with the output end of a band-pass filter and the input end of a controller and is used for sending a difference signal of the second component of a pilot signal obtained by the band-pass filter and the second component generated by the difference frequency circuit to the controller; the output end of the controller is in control connection with an external modulator and is used for converting the difference signal into a voltage and generating a corresponding control signal according to the value of the voltage to regulate a bias voltage value of the external controller. According to the external modulation radio-frequency optical transmission system, the intermodulation components of two pilot signals are taken as the difference signal, so that the interference from own second harmonic component is avoided, and the control accuracy for the optimal bias point of the external modulator is improved.
Description
technical field [0001] The invention relates to an externally modulated radio frequency optical transmission system, which belongs to the technical field of optical fiber transmission. Background technique [0002] In the external modulation radio frequency optical transmission technology, the bias point of the external modulator is detected and controlled by a single pilot signal, such as figure 1 As shown, it includes external modulator, optical splitter, optical detector, band-pass filter, bias control microcontroller, frequency multiplication circuit and pilot signal unit. The light source and radio frequency signal are output to the optical splitter after being modulated by the external modulator. The optical splitter enters the photodetector, and then the secondary component of the pilot signal can be obtained through band-pass filtering, and then sent to the bias control single-chip microcomputer together with the secondary component generated by the frequency multipl...
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Login to View More IPC IPC(8): H04L25/06H04L27/22
Inventor 左朋莎任欢赵伊默陈旭辉乔东旭刘朋陈学永
Owner CHINA AVIATION OPTICAL-ELECTRICAL TECH CO LTD