Whether channel spacing needs to be configured during hybrid transmission of 100G and 40G wavelengths

In a hybrid transmission system using G.652 and LEAF fibers, the principles for configuring channel spacing (guard bands) are as follows:
No guard band is required for hybrid transmission of 100G and 40G BPSK signals.
No guard band is required for hybrid transmission of 100G and 40G DQPSK signals.
No guard band is required for hybrid transmission of 40G BPSK and 40G DQPSK signals.
For hybrid transmission of 100G and 10G/40G ODB signals, guard bands must be configured and the 100G and 10G/40G ODB signals can neighbor each other on only one side.
For hybrid transmission of 40G BPSK and 10G/40G ODB signals, guard bands must be configured and the 40G BPSK and 10G/40G ODB signals can neighbor each other on only one side.
Note: The needs for guard bands vary depending on networks. Therefore, configure guard bands based on the network design.

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