首页>
外国专利>
Optical receiver for subcarrier frequency division multiplexing signals
Optical receiver for subcarrier frequency division multiplexing signals
展开▼
机译:用于子载波频分复用信号的光接收机
展开▼
页面导航
摘要
著录项
相似文献
摘要
The optical receiver includes a photodiode, a preamplifier and a length of transmission line. The photodiode may be connected to the preamplifier, either via the transmission line, or directly between the preamplifier and the transmission line, that is, the transmission line is connected as an open circuit. The transmission line 14 may comprise a coaxial cable, stripline, or any other suitable form of transmission line. The input impedance of the preamplifier should be designed to match the characteristic impedance of the transmission line. The noise of the preamplifier associated with the transmission line has a periodic spectrum dependent upon the length of the line with peaks at odd multiples of f' and minima at even multiples of f'. The value of f' is related to the length of the transmission line in accordance with: f'=v/4L where v is the propagation velocity, typically 2/3 the speed of light, and L is the length of the transmission line.
展开▼
机译:光学接收器包括光电二极管,前置放大器和传输线的长度。光电二极管可以经由传输线连接到前置放大器,或者直接在前置放大器和传输线之间连接,即,传输线作为开路连接。传输线14可包括同轴电缆,带状线或任何其他合适形式的传输线。前置放大器的输入阻抗应设计为匹配传输线的特征阻抗。与传输线相关的前置放大器的噪声具有周期频谱,其取决于线路的长度,其峰值在f'的奇数倍处,而最小值在f'的偶数倍处。 f'的值与传输线的长度有关,取决于:f'= v / 4L,其中v是传播速度,通常是光速的2/3,L是传输线的长度。
展开▼