The OAU1 is mainly used for gain adjustment, online optical performance monitoring, gain lock, and transient control. For detailed functions and features, refer to Table 1. Table 1 Functions and features of the OAU1 board Function and Feature Description Basic function Amplifies the input optical signals in C band. The total wavelengths range from 1529 nm to 1561 nm. Supports the system to transmit services over different fiber spans without electrical regeneration. Gain adjustment The OAU1 continuously adjusts the gain continuously based on the input optical power: OAU100: 16dB to 25.5dB OAU101/OAU102: 20dB to 31dB OAU103: 24dB to 36dB OAU105: 23dB to 34dB OAU106: 16dB to 23dB OAU107: 19dB to 27dB, and supports adjustment of maximum total output optical power. NOTE: OAU1 Specifications only provides the value of nominal gain. Actual gain includes the noise, and the value is bigger than that of nominal gain. Online optical performance monitoring Provides an in-service monitoring port (MON). This port connects to an optical spectrum analyzer or spectrum analyzer unit to monitor the spectrum and optical performance of the multiplexed signal without affecting traffic. Gain lock function The EDFA inside the board has the gain lock function. Adding or dropping one or more channels or optical signal fluctuation does not affect the signal gain of other channels. Working mode Supports the gain locking and power locking modes. In the gain locking mode, the gain of the board is tunable and users can query the actual gain of the board. The gain locking mode is enabled by default. The power locking mode applies to scenarios in which there is only dummy light to lock the output power of the board. Transient control function The EDFA inside the board has the transient control function. When channels are added or dropped, the board can suppress the fluctuation of the optical power in the path so as to implement the smooth upgrading and expansion. Alarms and performance events monitoring Detects and reports the optical power. Monitors the temperature of the pump laser. Detects the pump driving current, back facet current, pump cooling current, temperature of the pump laser and the ambient temperature of the board. Optical-layer ASON Supported NOTE: The TN11OAU1 board does not support the setting of Equalization Based OD for Optical Signal-Wavelength Commissioning.
