Relationship between the optical power of a line board and bit errors

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Relationship between the optical power of a line board and bit errors:
Bit error events may occur when the receive optical power of a line board exceeds the upper or lower threshold. If bit error events occur when the receive optical power is between the lower threshold and the upper threshold, the possible causes are as follows:
The fiber quality deteriorates, the line board is faulty, or the connector is dirty.

Other related questions:
Relationship of the optical power, sensitivity, and bit errors
Relationship of the optical power, sensitivity, and bit errors: When the optical power is lower than the receiver sensitivity, bit errors do not necessarily occur. However, you are advised to adjust the optical power to the normal range as soon as possible.

Relationship between bit errors of a tributary board and those of an optical board
Relationship between bit errors of a tributary board and those of an optical board: 1. As the tributary board detects signals from a cross-connect board, if bit errors occur on the optical board, they will also occur on the tributary board. 2. If the optical board has no bit errors, bit errors may occur on the tributary board due to faults of the tributary board or cross-connect board. 3. If the tributary board has no bit errors, the optical board is normal and has no bit errors either.

Relationship between the optical power and OSNR of BWS 1600G and the split ratio of the MON port on an optical amplifier board
The OSNR is proportional to the incident optical power. The split ratio of the MON port and OUT port on an OA board is 1:99. That is, the power of the MON port is 20 dB lower than that of the OUT port, which can be calculated as follows: Pout (dBm) �?Pmon (dBm) = 10 x l g (99/1) = 20 dB.

Relationship between single-wavelength input optical power and single-wavelength output optical power
Single-wavelength output optical power = OA gain + Single-wavelength input optical power

Conversion relationship between the multiplexed-wavelength optical power and single-wavelength optical power on an OA
The relationship is as follows: Multiplexed-wavelength optical power (dBm) = Single-wavelength optical power (dBm) + 10lgN (N: quantity of multiplexed wavelengths)

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