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Description of your requirements:
| MPN | QSFP-40G-LR4 | 
| Empowerfiber PN | QSFP-40G-LR4_tr1185 | 
| Form Factor | QSFP plus | 
| Max Data Rate | 40Gbps | 
| Wavelength | 1310nm | 
| Interface | LC duplex | 
| Max Distance | 10km | 
| Optical Components | DFB CWDM | 
| Cable Type | SMF | 
| DDM support | Yes | 
| TX power | -7~2.3dBm | 
| Working Temperature Range | 0 to 70°C (32 to 158°F) | 
| Compatible brand | Arista | 
