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Optical down-conversion method and system for high-frequency narrow-band signals

A narrowband signal, optical down-conversion technology, applied in the field of microwave photonics, can solve the problem of high cost, achieve the effect of cost saving, simple and feasible bias control method, and high frequency conversion efficiency

Active Publication Date: 2017-08-04
PEKING UNIV
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Problems solved by technology

[0007] The existing traditional down-conversion scheme generally requires cascading or parallel connection of two Mach-Zehnder intensity modulators, which makes the cost of the scheme relatively high

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  • Optical down-conversion method and system for high-frequency narrow-band signals
  • Optical down-conversion method and system for high-frequency narrow-band signals
  • Optical down-conversion method and system for high-frequency narrow-band signals

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Embodiment Construction

[0037] The solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The scheme principle of the present invention is as Figure 4 shown. One input terminal of the electric combiner is connected to the radio frequency RF signal, the other input terminal is connected to the local oscillator signal, and the output terminal of the combiner is connected to the RF input terminal of the Mach-Zehnder modulator; the radio frequency RF signal and the local oscillator signal are electrically combined together to modulate the optical signal. The modulator bias is controlled at the carrier suppress point. The modulated optical signal enters the optical circulator and the fiber grating (the two are combined as a wavelength selective switch), where the reflection wavelength of the fiber grating is the optical carrier wavelength of the laser, so that the optical carrier is reflected back into the photodetector PD an...

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Abstract

The invention relates to an optical down-conversion method and system for high-frequency narrow-band signals, belonging to the field of optical communication. The present invention comprises an optical modulator, the signal input end of which is connected to the output end of a laser light source, the signal output end is connected to the input end of a wavelength selective switch, and the carrier output end of the wavelength selective switch is connected to a first photoelectric detector via a first photoelectric detector. The input terminal of an automatic bias controller is connected, the signal output terminal is connected with a filter through a second photodetector, the radio frequency input terminal of the optical modulator is connected with the output terminal of a multiplexer, and the bias control terminal is connected with the The output terminal of the automatic bias controller is connected, one input terminal of the multiplexer is connected with a radio frequency signal output terminal, and the other input terminal is connected with the local oscillator signal output terminal; wherein, the bandwidth of the radio frequency signal is smaller than that of the radio frequency signal at the same time frequency, the frequency of the local oscillator signal. The invention has the advantages of low cost, high frequency conversion efficiency, easy control and the like.

Description

technical field [0001] The invention relates to an optical down-conversion method and system suitable for high-frequency narrow-band signals. The local oscillator signal and the radio frequency signal are modulated on the light by a Mach-Zehnder modulator, and then the frequency is down-converted by photoelectric detection, which belongs to the field of microwave photonics. Background technique [0002] Microwave photonics mainly studies the interaction between microwave signals and optical signals. Compared with traditional microwave systems, it has the advantages of small size, light weight, low cost, no electromagnetic interference, good nonlinear performance, and wide application bandwidth. There are in-depth applications in broadband wireless communication, radar systems, electronic countermeasures and other fields. Optical down-conversion technology is one of the key technologies in broadband large dynamic range microwave photonic systems. Traditional schemes include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/54
Inventor 朱晓琪陈章渊朱立新陈菲雅徐永驰
Owner PEKING UNIV
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