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    • 15. 发明授权
    • Digital pulse optical transmitter and receiver for local area network
applications
    • 用于局域网应用的数字脉冲光发射机和接收机
    • US5253096A
    • 1993-10-12
    • US788848
    • 1991-11-07
    • William R. FreemanBhavesh Patel
    • William R. FreemanBhavesh Patel
    • H04B10/155H04B10/00H04B10/04
    • H04B10/504H04B10/508H04B10/58H04B10/673
    • An optical transmitter and receiver for use in a fiber optic LAN and characterized by reduced pulse-width distortion, low noise, simplicity of design, and advantageous use of widely-available low-cost components. Pulse-width distortion of an optical transmitter is reduced using a pulse input and conditioning circuit that maintains the optical source in an ON state when the injected pulse energy subsides for a time closely approximating the source's turn-on delay. A pre-amplifier portion of an optical receiver is of the transimpedance type, having a low-noise first stage and a moderate-gain second stage connected to the first stage by a feedback resistance on the order of a few kilo-ohms. The low impedance of the feedback resistor minimizes thermal noise, whereas the moderate gain of the second stage still allows a high transimpedance to be achieved. A simple, single-transistor LO-LITE circuit is also disclosed.
    • 一种用于光纤LAN的光发射机和接收机,其特征在于减小脉宽失真,低噪声,简单的设计,以及广泛使用的低成本部件的有利用途。 使用脉冲输入和调理电路来减少光发射机的脉冲宽度失真,该脉冲输入和调理电路在注入的脉冲能量消失一段时间时,将光源保持在接通状态,时间与源的接通延迟相近。 光接收机的前置放大器部分是跨阻型,具有低噪声第一级和通过几千欧姆量级的反馈电阻连接到第一级的中等增益第二级。 反馈电阻器的低阻抗使热噪声最小化,而第二级的适度增益仍允许实现高跨阻抗。 还公开了一种简单的单晶体管LO-LITE电路。