光纤激光器的电流源

　　简介

　　一组大的光纤激光器由直流供电电流。激光驱动器由电流源提供沿信号通路进一步增加调制。这个电流源，虽然概念简单，构成一个非常棘手的设计问题。有一个光纤电流的实际要求的数目来源和失败考虑他们可以导致激光和/或光学元件破坏。

　　Design Criteria for Fiber Optic Laser Current Sources

　　Figure 1 shows a conceptual laser current source. Inputs include a current output programming port， an output current clamp and an enable command. Laser current is the sole output. This block diagram is deceptively simple. In practice， a laser current source must meet a number of practical requirements， some quite subtle. The key to a successful design is a thorough understanding of individual system requirements. Various approaches suit different sets of freedoms and constraints， although all must address some basic concerns.

　　图1.概念激光电流源看似简单的。实际系统问题和激光漏洞需要精心设计

　　There are two basic sets of concerns for laser current sources： performance and protection. Performance issues include the current source’s magnitude and stability under all conditions， output connection restrictions， voltage compliance， efficiency， programming interface and power requirements.

　　Protection features must be included to prevent laser and optical component damage. The laser， an expensive and delicate device， must be protected under all conditions， including supply ramp up and down， improper control input commands， open or intermittent load connections and “hot plugging.”