Specifications 1. Adopt import Laser and external modulator from America and Japan 2. Predistortion technique 3. SBS suppression circuit, adjustable SBS threshold with 13, 16, 18 4. AGC 5. Humanized display of using time, temperature, voltage, optical power and failure warning 6. Automatic power control, Ltd screen 7. Excellent ability of multistage lightning protection, automatic temperature control and automatic power switching, ensure long-time stable and continuous working in an adverse environment. 8. 19 inch standard mount rack 9. Intelligent: RG-45 Ethernet interface is optional, for implementing a monitor system under .