Hello everyone!
This time, I will share with you automatic optical power adjustment of the DC908.
Principles
The OptiXtrans DC908 supports automatic optical power commissioning. During deployment, you can press the red button on the PANEL board to enable automatic fiber connection discovery and automatically commission the insertion loss of the main optical path and add/drop wavelengths. The automatic commissioning and deployment reduce the commissioning time and costs.
Commissioning Principle
Figure 1 Typical networking: OTU+EMR8
As shown in Figure 1, automatic commissioning from west to east is used as an example. The reverse process is the same. The automatic commissioning process is as follows:
Wavelength-adding adjustment (site A: OTU -> EMR8)
The LS wavelength scanning power of the T_OUT port (12) at commissioning point B (transmit-end OA unit at site A) is used as a reference to automatically adjust the output power at commissioning point A (OTU board at site A) and the gain at commissioning point B (transmit-end OA unit at site A), so that the single-wavelength output optical power at commissioning point B (transmit-end OA unit at site A) is automatically adjusted to the nominal single-wavelength output optical power.
Main optical path adjustment (NE A -> NE B)
The attenuation of commissioning point C (transmit-end VOA at site A) and the gain of commissioning point D (transmit-end OA unit at site B) are automatically adjusted so that the gain of commissioning point D (transmit-end OA unit at site B) equals the output power of the T_OUT port (12) at commissioning point B (transmit-end OA unit at site A) minus the input power at the R_IN port (7) at commissioning point D (transmit-end OA unit at site B). In this way, the output optical power at commissioning point D (transmit-end OA at site B) is the nominal output optical power.
Wavelength-dropping adjustment (site B: EMR8 -> OTU)
Automatically adjust the attenuation at commissioning point E (receive-end VOA at site B) to ensure that the actual input optical power at point F (OTU board at site B) is within the permitted range.
Figure 2 Typical networking diagram: OTU+MD60+OL
As shown in Figure 2, automatic commissioning from west to east is used as an example. The reverse process is the same. The automatic commissioning process is as follows:
Wavelength-adding adjustment (site A: OTU -> OL)
The OPM wavelength scanning power of the T_OUT port (12) at commissioning point C (transmit-end OA unit at site A) is used as a reference to automatically adjust the output optical power at commissioning point A (OTU board at site A), the tunable optical power at commissioning point B (MUX/DEMUX board at site A), and the gain at commissioning point C (transmit-end OA unit at site A), so that the single-wavelength output optical power at commissioning point C (transmit-end OA unit at site A) is automatically adjusted to the nominal single-wavelength output optical power.
Main optical path adjustment (NE A -> NE B)
The attenuation of commissioning point D (transmit-end VOA at site A) and the gain of commissioning point E (receive-end OA unit at site B) are automatically adjusted so that the output power of the T_OUT port (12) at commissioning point C (transmit-end OA unit at site A) minus the input power of the R_IN port (7) at commissioning point E (receive-end OA at site B) equals the gain at commissioning point E (transmit-end OA unit at site B). In this way, the output optical power at commissioning point E (receive-end OA at site B) is the nominal output optical power.
Wavelength-dropping adjustment (site B: OL -> OTU)
At commissioning point F (receive-end VOA at site B), the actual input optical power of the OTU is adjusted within the permitted range of the received optical power.
But sometimes after a fiber cut the optical power automatic adjustment result will not the same as before, which may confuse customers. The following figure uses the OSC optical power as an example to answer your question. for more parameters please check the last product document or check and confirm with the Huawei engineer.
That's all. Thank you!
