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question about optical transceiver

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I design a optical transceiver , the circuit board of transmitter and receiver is separately,when I add the voltage to the LA of the receiver,the signal all disappear, only a lot noise, and very stange, the circuit signal that drives the laser also becomes very bad, a lot noise in it , and I donnot kown the reason, can someone to help me?
Thanks
 

do you add the isolator in the optical link?
 

yeh i need to know what does an opto isolator d
o?
 

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