Functional Design and Implementation with On-line Programmable Technology in Optical Fiber Communication Pulse Code Modulation Test System

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.