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

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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.

Other related questions:
Whether DCM modules are required on OAU boards or other boards that support dispersion compensation on a 40G or 100G transmission network
A 40G/100G ePDM-BPSK system is a type of coherent transmission system. DSP chips are configured at the receive end of the system to compensate for electrical-layer PMD and CD. In a 40G DQPSK or another type of coherent system, DCM modules are still required to suppress the PMD and CD. In such as system, you can install a DCM module between the TDC and RDC ports of an OAU board. You can also use DCU boards to suppress the link dispersion.

Whether DCMs need to be configured in a 100G coherent system
No. OTU boards uniformly compensate for accumulated fiber dispersion at the receive end using specific algorithms, eliminating the need of DCMs for dispersion compensation. This simplifies network design and saves some space in equipment rooms.

Client-side transmission distance of a 100G OTU board
The client-side transmission distance of a board depends on the client-side optical module.

Wavelength spacing for 200G signals
For 10 Gbit/s, 40 Gbit/s, and 100 Gbit/s signals, the wavelength spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system. For 200 Gbit/s signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is flexible, instead of being fixed at 50 GHz or 100 GHz. For example, if different modulation methods are used for 200 Gbit/s signals, different required bandwidth is required. (For example, it can be 75 GHz or 150 GHz). Flexible ROADM adjusts bandwidth based on signals and grooms the signals to specified directions according to the network configurations.

Channel spacing of 200G signals
For 10G, 40G, and 100G signals, the channel spacing is 50 GHz for an 80-wavelength system and 100 GHz for a 40-wavelength system. For 200G signals, the flexible grid technology can be used. When the technology is used, wavelength bandwidth is variable. For example, if different modulation methods are used for 200G signals, the required bandwidth is different. For example, it can be 75 GHz or 150 GHz.Flexible ROADM adjusts bandwidth based on signals and grooms the signals to specified directions according to the network configurations.

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