What are the differences between 40G-SR and 40G-iSR optical modules

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40G-SR and 40G-iSR optical modules provide similar features and can communicate with each other. They differ in the maximum transmit power. A 40G-iSR optical module has lower maximum transmit power than a 40G-SR optical module.


Compared to 40G-SR optical modules, 40G-iSR optical modules are more suitable for connecting to four 10GE-SR optical modules when 40GE ports are split into 10GE ports.

Other related questions:
Can 40G-SR and 40G-iSR optical modules communicate with each other?
40G-SR and 40G-iSR optical modules provide similar features and can communicate with each other. They differ in the maximum transmit power. A 40G-iSR optical module has lower maximum transmit power than a 40G-SR optical module. Compared to 40G-SR optical modules, 40G-iSR optical modules are more suitable for connecting to four 10GE-SR optical modules when 40GE ports are split into 10GE ports.

Differences in dispersion compensation between 40G coherent boards and 40G non-coherent boards
40G non-coherent boards use the TDC technology and the dispersion tolerance is 800 ps/nm. 40G coherent boards use the DSP technology and the dispersion tolerance reaches 60,000 ps/nm. A network deploying non-coherent boards must use DCMs for dispersion compensation. A network that uses only coherent boards does not need to use DCMs.

Interconnection between LW40 and LU40 (40G OTU boards)
The UFEC modules in the LW40 and LU40 boards are provided by different vendors. As a result, the UFEC algorithms of the two boards are different and therefore the two boards cannot be interconnected. To implement interconnection between LW40 and LU40 boards, disable the UFEC function of the two boards and enable the standard FEC function of the OTN equipment. The FEC error correction capability, however, will be greatly reduced when the standard FEC function of OTN equipment is used.

Difference between colored optical modules and colorless optical modules
Colored optical modules support fixed wavelengths. Colorless optical modules support multiple wavelengths and combine them into white light. Therefore, colorless optical modules support tunable wavelengths.

What are the differences between a 10GBASE-LRM optical module and other optical modules
Compared with other optical modules, 10GBASE-LRM optical modules have lower cost, lower power, smaller size and provide universal multimode ports. The maximum transmission distance of a 10GBASE-LRM optical module is up to 220 m. A 10GBASE-LRM optical module cannot interoperate with other types of optical modules.

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