单选题For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （）A 0.4 nanometersB 0.6 nanometersC 0.8 nanometersD 1.2 nanometersE 1.6 nanometers
单选题
For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （）
A
0.4 nanometers
B
0.6 nanometers
C
0.8 nanometers
D
1.2 nanometers
E
1.6 nanometers
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