Millimeter wave subcarrier light transmitter based on double-frequency optical fiber laser
A fiber laser, millimeter wave technology, used in electromagnetic transmitters, electromagnetic wave transmission systems, electrical components, etc., to achieve the effects of narrow line width, low noise, and high stability
Inactive Publication Date: 2008-06-11
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 accompanying drawing.
[0027] see figure 1 Shown, a kind of millimeter-wave subcarrier optical transmitter based on dual-frequency fiber laser of the present invention comprises:
[0028] A pumping source 1, used to pump the active optical fiber;
[0029] An isolator 2, the input end of the isolator 2 is connected to the output end of the pumping source 1, which is used to isolate the light entering the pumping source and protect the pumping source;
[0030] An active resonant cavity 3, the input end of the active resonant cavity 3 is connected to the output end of the isolator 2, providing optical gain and feedback, and generating dual longitudinal mode laser;
[0031] The active resonant cavity 3 described therein includes: a large broadband grating 31 fabricated on a common single-mode optical fiber, a doped optical fiber 32, and a grating 33 fabricated on a polarization-maintaining optical ...
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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), in particular 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 communication technology with higher speed and higher capacity 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, eliminating various communication blind spots; The "last mile" access technology can also be implemented using the ROF system. Therefore, the ROF technology is widely regarded as an important application technology in the f...
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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