簡介

　　一組大的光纖激光器由直流供電電流。激光驅動器由電流源提供沿信號通路進一步增加調制。這個電流源，雖然概念簡單，構成一個非常棘手的設計問題。有一個光纖電流的實際要求的數目來源和失敗考慮他們可以導致激光和/或光學元件破壞。

　　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.

　　圖1.概念激光電流源看似簡單的。實際系統問題和激光漏洞需要精心設計

　　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.”