The OBU2 supports the online optical performance monitoring function, gain lock, transient control, and other functions.
Table 1 provides the functions and features of the OBU2.
Table 1 Functions and features of the OBU2
| Function and Feature | OBU2 |
| Basic functions | Amplifies a maximum of 40 channels of optical signals with the channel spacing of 100 GHz at the same time. Supports the system to transmit services over different fiber spans without electrical regeneration. |
| Typical gain | The typical gain of the OBU205 is 23 dB. |
| Online optical performance monitoring function | Provides the online monitoring interface. A small amount of optical signal can be transmitted to the spectrum analyzer through the interface so that the spectrum and optical performance of the multiplexed optical signal can be monitored without a service interruption. |
| Gain lock function | The EDFA inside the board has the gain lock function. When one or more channels are added or dropped, or optical signals of certain channels fluctuate, the signal gain of other channels is not affected. |
| 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 to realize the smooth upgrading and expansion. |
| Performance events and alarms monitoring | Checks and reports the optical power. Controls the temperature of the pump laser. Detects the pump driving current, back facet current, cooling current, temperature of the pump laser, and ambient temperature of the board. |
NOTE: The OBU2 is available in only one type: OBU205.
The technical specifications of the OBU2 include the parameters specified for optical interfaces, laser safety class, mechanical specifications, and power consumption.
Parameters Specified for Optical Interfaces
Table 1 lists the parameters specified for the optical interfaces of the OBU2.
Table 1 Parameters specified for the optical interfaces of the OBU2
| Parameter | Value |
| OBU205 |
| Operating wavelength range (nm) | 1529 to 1561 |
| Nominal input power range (dBm) | -24 to 0 |
| Input power range per channel (dBm) | 40 channels | -24 to -16 |
| 80 channels | -24 to -19 |
| Nominal single-wavelength input optical power (dBm) | 40 channels | -16 |
| 80 channels | -19 |
| Nominal single-wavelength output optical power (dBm) | 40 channels | 7 |
| 80 channels | 4 |
| Noise figure (dB) | ≤ 7.0 |
| Nominal gain (dB) | 23 |
| Gain response time on adding/dropping of channels (ms) | < 10 |
| Channel gain (dB) | 23±1.5 |
| Gain flatness (dB) | ≤ 2.0 |
| Input reflectance (dB) | < -40 |
| Output reflectance (dB) | < -40 |
| Pump leakage at input (dBm) | < -30 |
| Maximum reflectance tolerance at input (dB) | -27 |
| Maximum reflectance tolerance at output (dB) | -27 |
| Maximum total output optical power (dBm) | 23 |
| Multi-channel gain slope (dB/dB) | ≤ 2.0 |
| Polarization dependent loss (dB) | ≤ 0.5 |
| Adjustment accuracy (dB) | 1 |
Laser Safety Class
The safety class of the laser on the board is Class 1M. The maximum launched optical power of the optical interfaces is within the range from 10 dBm (10 mW) to 22.15 dBm (164 mW).
Mechanical Specifications
The mechanical specifications of the OBU2 are as follows:
- Dimensions (mm): 50.8 (W) x 235.2 (D) x 261.4 (H)
- Weight (kg): 1.6
Power Consumption
- The maximum power consumption of the TN12OBU205 at room temperature (25°C) is 14 W.
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