一种功率可调的稳定激光光源的实现方法

在光纤通信系统测试中，波长为850 nm、 1310 nm、1490 nm、1550 nm和1625 nm 等的红外激光光源作为信号源具有广泛的应用。该光源需要 具有稳定的输出光功率。通常采用含有衰减片的光 衰减器对其输出光功率进行调节以满足不同场合的测 试与校准需求。通过分析激光器输出功率与 驱动电流的特征曲线，提出了一种在电路上采用压控电 流的方法，实现了稳定光源的输出光功率步进可调(调 节范围为30 dB)。该方法可有效减少光衰减器的使用，缩减测 试系统的仪器数量，提高测试效率，降低测试成本。

A Method for Realizing Adjustable and Stable Laser Light Source

As signal sources, the infrared laser light sources with wavelengths of 850 nm, 1310 nm, 1490 nm, 1550 nm and 1625 nm have wide applications in the test of optical fiber communication systems. These laser light sources need stable output light power. Usually, to meet the test and correction requirements in different cases, an optical attenuator with optical attenuation slices is used to adjust the output light power of the light source. By analyzing the characteristic curves of laser output power and driving current, a method for using voltage-controlled current on a circuit is proposed. Thus, a stable laser light source with adjustable output light power (the adjusting range is up to 30 dB) is realized. By this method, the use of optical attenuators can be reduced effectively, the number of the instruments to be used can be reduced, the test efficiency can be improved and the test cost can be reduced.