Two-dimensional encoder-decoder manufacture method based on sampling grating
A codec and sampling grating technology, which is applied in the field of communication optoelectronics, can solve the problems of bulky array, system transmission rate limitation, long-time codec function, etc., to increase the system transmission rate, improve communication confidentiality, expand The effect of codeword capacity
Inactive Publication Date: 2009-10-21
TSINGHUA UNIV
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However, due to the large volume of the array, each fiber grating that constitutes the array is required to be made to match each other, and the accuracy of the length interval between them is very high, which restricts its practical application.
Secondly, this array structure makes the distance of light transmission in it long, and the corresponding light needs a long time to perform the encoding and decoding function of the fiber grating array, so the transmission rate of the system will be greatly limited
In addition, the structure of each fiber grating in the codec manufactured by the fiber grating array is simple, which makes the security of the optical code division multiple access system have hidden dangers.
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[0023] like figure 2 , image 3 As shown, a fiber grating two-dimensional codec is made of a single optical fiber, and a fiber grating connected to the optical fiber communication line through an optical circulator is arranged on the optical fiber communication line. The optical fiber grating is connected to an optical code division multiple access optical fiber communication line through an optical circulator. The optical circulator has one interface connected to the optical fiber grating, and the other two interfaces are connected to the optical fiber communication line.
[0024] The fiber grating two-dimensional codec is a device with a fiber grating and a length of 1 cm to 100 cm (the optimal length is 10 cm). During production, by controlling the sampling period, one fiber grating is divided into several fiber grating segments with different sampling periods. Each period of each segment will generate different wavelengths in the frequency domain. According to the prese...
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The manufacturing method of the two-dimensional codec based on the sampling grating belongs to a kind of communication optoelectronic technology, which is characterized in that the optical fiber communication line is provided with a fiber grating connected to the optical fiber communication line through an optical circulator, and its length is 1 cm. ~100 cm, using a variety of optical fibers as raw materials, using a 200-350nm laser to irradiate the optical fiber through a phase mask, the irradiation time is 1 minute to 100 minutes, and then a fiber grating with a periodically changing refractive index is formed in the optical fiber. The location of the irradiation point can generate a two-dimensional encoded codeword structure in the time domain and frequency domain according to different designs, so as to realize the two-dimensional encoding and decoding of the optical code division multiple access optical fiber communication system on a single fiber grating. The advantage of the present invention is that the codeword structure of the two-dimensional code can be conveniently designed with the fiber grating, thereby greatly improving the data transmission rate, expanding the available codeword capacity, and simplifying the production of the two-dimensional codec in the optical code division multiple access system .
Description
technical field [0001] The invention belongs to a communication optoelectronic technology, and the design and manufacture method belong to the technical field of optical fiber communication, in particular to the field of optical fiber grating manufacturing. Background technique [0002] Codec is the core device of optical code division multiple access optical fiber communication system, so the design and production technology of codec is the core key technology of optical code division multiple access system. Using fiber grating as the main device is a conventional and feasible method to realize codec, but ordinary fiber grating can only realize one-dimensional coding in time domain. For the codec in the optical code division multiple access system manufactured by two-dimensional coding in both the time domain and the frequency domain, the fiber grating array structure can usually be used, such as figure 1 shown. However, due to the large size of the array, each fiber grat...
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IPC IPC(8): G02B6/34H04B10/12H04J14/00H04B10/25
Inventor 张邺陈宏伟季恒司治建谢世钟
Owner TSINGHUA UNIV