# Method used to convert between the optical power of multiplexed wavelengths and optical power of single wavelengths of an OA board

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The relationship between the optical power of multiplexed wavelengths and optical power of single wavelengths of an OA board is as follows:
Optical power of multiplexed-wavelength signals = Optical power of single-wavelength signals + 10lgN
where N is the number of wavelengths for multiplexed-wavelength signals.

###### Other related questions:
Nominal single-wavelength input optical power for OA boards on BWS 1600G?
Suggestion: What is the nominal single-wavelength input optical power is determined for OA boards of the BWS 1600G? Answer: Strictly speaking, there is no definition of nominal single-wavelength optical power for OA boards. The optical power is determined as follows: To increase the signal-to-noise ratio, the incident optical power and receive optical power must reach the maximum as possible. A 400G OAU board is used as an example. The maximum incident optical power is 20 dBm and 40 wavelengths are supported. Therefore, the maximum single-wavelength output optical power is 4 dBm. The BA gain is 19 dB, and therefore the single-wavelength input optical power of the BA board is defined to -15 dBm. A VOA and DCM need to be added between PA and BA boards, the minimum VOA attenuation is 3 dB, and the maximum DCM attenuation is 12 dBm. Therefore, the minimum single-wavelength output optical power of the PA board is as follows: -15 + 12 + 3 = 0 (dBm). The C-band gain is 20 dB and the L-band gain is 19 dB, and therefore the maximum single-wavelength input optical power of the PA board is -19 dBm. The attenuation of the maximum span is 36 dB, and therefore the minimum single-wavelength input optical power of the PA board is as follows: 4 - 36 = 32 (dBm). Varying with span reaches, the single-wavelength input optical power of the PA board ranges from -32 dBm to -19 dBm. The gain of a PA board embedded with a Raman amplifier (OAU_R) is 10 dB, and therefore the single-wavelength input optical power is -9 dBm.

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)

Nominal single-wavelength input optical power of the TN12OBU1 board in a 40-wavelength system
The nominal single-wavelength input optical power of the TN12OBU1 board in a 40-wavelength system is as follows: �?0 dBm for TN12OBU101 �?9 dBm for TN12OBU103 �?7 dBm for TN12OBU104

Single-wavelength input optical power range and nominal single-wavelength optical power of the OBU101 board on the OSN 6800
The single-wavelength optical power range is �?2 dBm to �?0 dBm, and the nominal single-wavelength optical power is �?0 dBm. The receive optical power depends on the number of added wavelengths.

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