# Nominal single-wavelength input optical power for OA boards on BWS 1600G?

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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.

###### Other related questions:
Method used to convert between the optical power of multiplexed wavelengths and optical power of single wavelengths of an OA board
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.

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

Nominal single-wavelength incident optical power of an 80-wavelength system
The nominal single-wavelength incident optical power is 1 dBm for an 80-wavelength system.

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.

Nominal single-wavelength input optical power of the OSN 6800 HBA board in a 40-wavelength system
The nominal single-wavelength input optical power of the HBA board in the OSN 6800 is as follows: -22 dBm (in an 80-wavelength system) -19 dBm (in a 40-wavelength system) -13 dBm (in a 10-wavelength system)

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