Sampling fibre-optical raster used by coding-decoding of DS-OCDMA system

Abstract

The invention discloses a DS-OCDMA system coding and decoding sampling optical fiber grating and its producing method, it belongs to coding and decoding technology field of optical CDMA communication, the character is: modulating average optical fiber grating using new sampling structure, making its -1 grade reflection peak of reflected spectrum have the needed coding and decoding function. It only needs to average phasic moulding board, compared to current method, it decreases producing needed precision, and increases producing flexibility, so the producing cost is reduced, and it is suitable to be produced in great force.

Description

technical field [0001] The invention relates to the production of optical fiber grating and optical code division multiple access communication system, in particular to the production of encoding and decoder therein. Background of the invention [0002] In recent years, the rapid development of the Internet has continuously put forward new requirements for the capacity and functions of the transmission system. Today, more mature transmission systems include optical wavelength division multiplexing (WDM) systems, optical time division multiplexing (OTDM) systems, and other hybrid methods. With Tbits per second (1×10 12 bit / s) transmission system was successfully studied, and people turned their attention to the exchange angle of the system, and thus proposed such as optical code division multiple access (OCDMA) to improve the system's functions. [0003] Code Division Multiple Access (CDMA) is a spread spectrum communication method, which allows a large number of users to sh...

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Problems solved by technology

[0008] It can be seen that the phase of the FBG obtained by the phase template-scanning method is determined by the template 26, so if encoders and decoders of different coding schemes are to be produced, different phase templates with specific phase shifts are required, which will be extremely difficult. Greatly increase the production cost; otherwise, the method of moving the relative position between the phase template 26 and the optical fiber 27 in the production process will be used to obtain the required phase shift. Although this method has greater flexibility than the above method, it also requires Move the translation stage with very high precision, at least in the nanometer level, and if there are many coders and decoders, it is required to do a lot of phase shifts in turn for each coder and decoder, which increases the complexity of the production process It not only reduces the yield of the product, but also increases the production time, and the difference in the properties of each coder and decoder obtained will also increase, which is not conducive to mass production

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