Eightfold-frequency optical millimeter wave generation method and system based on polarization modulator cascading
A technology of polarization modulator and polarization controller, applied in electromagnetic wave transmission system, transmission system, optical fiber transmission, etc., can solve limitations and other problems
Active Publication Date: 2015-10-28
BEIJING UNIV OF POSTS & TELECOMM
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[0004] At present, the research on applying PolM to the RoF system has the following main research results: 1. Obtaining a frequency doubling optoelectronic oscillator (OEO) based on a polarization modulator; 2. Generating a frequency comb spectrum based on a polarization modulator. 3. Millimeter-wave frequency multiplication generation based on polarization modulators, but these frequency multiplication results are mostly limited to quadruple frequency
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[0032]First, if figure 1 As shown, the frequency is f 0 = 193.1THz, linearly polarized light emitted by a continuous laser with a line width of 500MHz is injected into the PC, and the PC is adjusted to make the polarization direction of the linearly polarized light form an angle of 45 degrees with the two principal axes of PolM, so as to realize two orthogonal polarizations of the linearly polarized light in PolM The components on the state are equal, the PolM is driven by a 10GHz RF local oscillator, and the modulation index is set to 1.7. The two orthogonally polarized lights output from the first PolM pass through a pol and are collectively called a linearly polarized light. If the main axis of the pol is adjusted to form an angle of 45 degrees with the two orthogonally polarized lights, the synthesized linearly polarized light is two orthogonally polarized lights. The equal sub-coherent superposition of light suppresses the odd-order sidebands, leaving only the optical ca...
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The invention provides an eightfold-frequency optical millimeter wave generation method and system based on polarization modulator cascading. The schematic diagram is shown in an accompanying drawing. Through combination of polarization modulators with a polarizer, suppression of an odd-order sideband can be realized. Two polarization modulators are connected in series to realize twice suppression of the odd-order sideband. Meanwhile, only a pi / 2 phase difference exists between radio-frequency signals loaded on the two polarization modulators, and the modulation indexes of the polarization modulators are controlled, so that other sidebands other than positive and negative four-order sidebands are suppressed in order to generate an eightfold-frequency optical millimeter wave signal. Through the frequency beat function of a photo-electric detector, an electric domain millimeter wave signal is obtained, and the frequency of the signal is eight times that of a radio frequency local oscillator. According to the method, direct-current offset does not need to be controlled, and no optical filter is needed, so that generated millimeter waves have the advantages of high stability, high frequency spectrum purity, adjustable frequency, wide adjustable range and the like.
Description
technical field [0001] The present invention relates to the fields of optical communication and millimeter wave communication, in particular to an optical-borne millimeter-wave generation technology for a central station of an optical-borne radio frequency (RoF) system, and provides a method for generating millimeter-waves with tunable frequency and simple structure and stable system. Background technique [0002] Radio over Fiber (ROF) technology is a new type of communication technology that combines optical fiber communication and microwave communication. On the one hand, for optical fiber communication, due to the low loss and high bandwidth characteristics of optical fiber, optical fiber communication has gradually developed from the application of the core network to the access network close to the user. With the emergence and popularization of more and more broadband multimedia services, high-speed, high-capacity optical fiber access networks have become the developme...
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Login to View More IPC IPC(8): H04B10/2575H04B10/548
Inventor 马健新杨洋
Owner BEIJING UNIV OF POSTS & TELECOMM