1 - What is power commission in DWDM?
It’s the process of setting, calculating, and adjusting the optical transmit (Tx) power so that it meets the receive (Rx) requirements.
2 - What should we consider during power commissioning?
We must take into account Rx sensitivity, Rx overload limits, launched power range, and link attenuation.
3 - Do we need tools for this process?
Yes. First, ensure the fiber is clean. Then, depending on the case, we may need a Fixed Optical Attenuator (FOA), Variable Optical Attenuator (VOA), a power meter, and an Optical Spectrum Analyzer (OSA).
4 - What are FOA and VOA used for?
- FOA (Fixed Optical Attenuator): Provides a constant attenuation value.
- VOA (Variable Optical Attenuator): Provides adjustable attenuation.
Both are used to fine-tune the optical power of the link.
5 - Do we need to align the spectrum analyzer? How?
Yes, alignment ensures accurate measurements. First, set the optical power at an output port, then measure the same port with the spectrum analyzer. The difference between values should not exceed 0.5 dB.
6 - What is overload?
It’s the maximum optical power a port can receive without distortion or damage.
7 - What is Rx sensitivity?
It’s the minimum optical power a port can detect while still operating correctly.
8 - What is the launched power range?
It’s the range of optical transmit power that the card can provide.
In the next post, we’ll go step by step on how to calculate the optical power values.
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