Based on the principles of voltage-frequency conversion and frequency-voltage conversion

with the use of LED—PIN optical transmission structure and corresponding integrated circuits

the development of an analog-signal optical fiber communication system with low cost

and transmission precision reached 0.1 % has been successfully achieved.This system solves disadvantages such as the nonlinear distortion of weak analog-signal’s transmission;the greatly high cost of A/D converter digital optical fiber transmission technology and so on.It provided a predominant transmission scheme for multi-channel

long distance and low-frequency weak analog-signal.