摘要
本文报导了一种测量光耦合效率η的新实验方法。这个方法是建立于p-n结短路光电流原理上的。 本文推导出适合于行波激光放大器的光耦合效率的公式。短路光电流用一检流计测量,利用公式获得光耦合效率的实验值。 利用实验所测光耦合效率,测量了行波激光放大器的增益随注入电流变化的规律,其结果和实验符合。 另外本文还介绍了在脉冲注入电流条件下测行波半导体激光放大器增益的实验方法。
The optical coupling efficiency is an important parameter for the fiber communication devices, such as semiconductor laser, semiconductor laser amplifier and detector etc.This parameter shows how big optical power is coupled out through fiber from a semiconductor laser, how big optical power is coupled into a semiconductor laser amplifier or a detector.Until now there is no direct measuring method to get the optical coupling efficiency experimentally.In this paper a new method for measuring 77 has been reported. This method is based on the principle of short optical current of p-n junction.Suppose Pin(optical power)is incident on one of the cavity mirrors. If the incident photon energy is hv=Eg(the energy gap of semiconductor of active region),free carriers-electrons and holes-are excited. These free electrons and holes flow in opposite directions under the action of built-in field in p-n junction. The short optical current is composed of these free electrons and holes.Hence the short optical current can be used to measure the input optical power and to measure .The formulas of optical coupling efficiency for travelling wave laser amplifier are deduced.The short optical currents are measured by a galvanometer. Then the optical coupling efficiency are calculated by the formulas.Using the experimental data of , the dependence of gain of travelling--wave semiconductor laser amplifier on injection current is obtained. It is agree with theory.Besides,the measuring method of gain of travelling-wave semiconductor laser amplifier under pulse injection current condition is also given.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1989年第1期69-73,共5页
Chinese Journal of Luminescence
