发明授权
US5866898A Time domain multiplexed amplified sensor array with improved signal to noise ratios 失效
具有改善的信噪比的时域多路复用放大传感器阵列

Time domain multiplexed amplified sensor array with improved signal to
noise ratios
摘要:
The present invention significantly improves the signal to noise ratio (SNR) in a passive optical array by adding erbium-doped optical amplifiers between the sensor couplings to offset the coupler splitting losses. Optical amplifiers are inserted between the sensor couplings along the signal path, and the gain of the amplifiers is designed to offset losses due to the previous coupling. The overall SNR can be maintained without significant degradation even for large numbers of sensors. In a first aspect of the present invention, the amplifiers are located along the distribution and return buses directly after the couplers, except possibly for the last sensor. In a second aspect of the present invention, the amplifiers are located directly before the couplers. The optical amplifiers preferably are made of short lengths of erbium-doped fiber spliced into the distribution and return buses. Improvements can be made to the SNR when the distribution bus coupling ratios are set at optimal values. The value of the optimal coupling ratio depends upon the amplifier configuration, the excess loss and other configuration parameters. In alternative embodiments, sensors are grouped into parallel configurations along the distribution and return buses to increase the number of sensors without a corresponding increase in the number of amplifiers and with an improvement in system performance to a certain point.
信息查询
0/0