Millimeter wave subcarrier light transmitter based on double-frequency optical fiber laser
A fiber laser and millimeter wave technology, applied in electromagnetic transmitters, electromagnetic wave transmission systems, electrical components, etc., to achieve high stability, narrow line width, and solve phase noise problems
Inactive Publication Date: 2012-03-07
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology
At the same time, the laser has the advantages of narrow line width and low noise, and solves the phase noise problem from the source. The dual-frequency laser self-heterodyne generated by the same resonator generates beat-frequency millimeter waves to realize low-cost millimeter-wave subcarrier signal transmission.
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[0026] The present invention will be further described below in conjunction with the accompanying drawings.
[0027] see figure 1 As shown, the present invention is a millimeter-wave subcarrier optical transmitter based on a dual-frequency fiber laser, comprising:
[0028] a pump source 1 for pumping the active fiber;
[0029] an isolator 2, the input end of the isolator 2 is connected with the output end of the pump source 1, for isolating the light entering the pump source, and protecting the pump source;
[0030] an active resonator 3, the input end of the active resonator 3 is connected with the output end of the isolator 2, provides optical gain and feedback, and generates dual longitudinal mode laser light;
[0031] The active resonant cavity 3 includes: a large broadband grating 31 fabricated on a common single-mode fiber, a doped fiber 32, and a grating 33 fabricated on a polarization-maintaining fiber, which are serially connected;
[0032] an information loading m...
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The invention relates to a millimeter wave subcarrier light transmitter based on a dual-frequency fiber laser, comprising a pumping source, an isolator the input end of which is connected with an output end of the pumping source and used for isolating lights entering into the pumping source and playing a part in protecting the pumping source; an active resonant cavity the input end of which is connected with an output end of the isolator, and optical gain and feedback are provided and then double longitudinal mode lasers are generated; a information load module the input end of which is connected with an output end of the active resonant cavity; a monomode fiber one end of which is connected with the information load module and used for transmitting signals and realizing long-distance communication; a photo detector the input end of which is connected with the other end of the monomode fiber and used for converting optical signals into electrical signals; an amplifier which is connected with an output end of the photo detector and used for amplifying the electrical signals which are generated by the photo detector; and a transmitting antenna which is connected with an output end of the amplifier.
Description
technical field [0001] The invention belongs to the field of millimeter wave subcarrier optical fiber communication (ROF), and particularly relates to a millimeter wave subcarrier optical transmitter based on a dual-frequency fiber laser. Background technique [0002] Optical fiber communication technology can provide massive bandwidth and ultra-high speed with low transmission loss, while wireless communication can provide flexible access methods. Combining the advantages of the two to develop higher-speed and higher-capacity communication technologies is the latest in recent years. The ROF (Radio Over Fiber) technology has attracted much attention. At the same time, the ROF system can also be used to achieve seamless access to mobile terminals, buildings, underground and other environments, and eliminate various communication blind spots; as a factor that determines the overall communication quality. The access technology of the "last mile" can also be realized by using th...
Claims
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IPC IPC(8): H04B10/155H04B10/50
Inventor 李芳徐团伟王永杰刘育梁
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI