Can somebody please tell me the minimum value of thermal noise in optical receivers?

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Alexander S. Solntsev

Depends on the receiver. Here are the formulas to calculate the minimum value of thermal noise depending on various parameters:

http://authors.library.caltech.edu/8954/1/ZMUao03.pdf

Azita Yousefi

In chapter 4 of "Fiber-Optic Communications Systems, Third Edition. Govind P. Agrawal " explain about thermal noise perfectly.