Which of these has bigger bandwidth and give us more data rate, single mode or multi-mode fiber ?

The single mode allows for bigger bandwith. The equipment can be upgradeable without changing the fiber cabling infrastructures.

a Single Mode fiber it's Bigger bandwith

Single mode fiber provides more bandwidth as compared to multi-mode fiber bothe of them are having almost same cladding but SMF is less core than MMF and less attenuation as well.

Single mode Fiber is having bigger BW tahn Multimode Fiber

SM fiber have more bandwidth than MM fiber

Single mode fiber provides more bandwidth as compared to multi-mode fiber therefore provides more data rate.

Single mode fiber haw bigger bandwidth and give us more data rate then the multi-mode fiber 

Single mode carry more data due to extremely high "laser optimised" and good result upto 50km, for transmission side.

single mode has higher bandwidth than multi-mode fiber 

Single Mode fiber optic cable has a small diametral core that allows only one mode of light to propagate. Because of this, the number of light reflections created as the light passes through the core decreases, lowering attenuation and creating the ability for the signal to travel faster, further. This application is typically used in long distance, higher bandwidth runs more than multimode.

Single mode fiber allows only mode of light,attenaution is very low,it allows signal transfer very fast and it supports hifger bandwitdhs..