What is the wavelength of gray light services that can be sent and received by the BIFS board used in Huawei’s power miniaturized OTN?

What is the wavelength of gray light services that can be sent and received by the BIFS board used in Huawei’s power miniaturized OTN?
A . 850nm
B . 1550nm
C . 1310nm
D . 1490nm

Answer: B

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