Functional design and implementation with on-line programmable technology in optical fiber communication pulse code modulation test system
2010
In order to complete the functional design in the fiber optical communication pulse code modulation test system, taking
advantage of CPLD / FPGA and SOPC technology, software solutions used to design system hardware features and
control functions, thereby the whole system could attain optimisation in the logic control as well as encoding and
decoding functional designs on the motherboard, enabling this system fulfill the capacities varying from simple digital
simulation transmission modulate to the high speed fiber optical communication network information encoding and
decoding functions. Simultaneously the application of logarithmic pressure companding technique, PCM encoding and
decoding system to improve the small signal quantizing SNR(Signal-to-Noise Ratio), TP3067 adopting A rate thirteen
broken lines to carry on signal pressure companding. When the signal at a certain stage, the quantizing SNR is
invariable(as signal receives uniform quantization in this phase, therefore the quantizing SNR drops along with signal
amplititude decreasing). Test results are as follows: ideal various signal encoding and decoding system waveforms, high
performance parameters , achieve the desired designing aim, a entirely new approach to realize different kinds of
information encoding and decoding model building and implementation, saving development costs, improving design
efficiency, satisfactory actual results, stable operation.
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