Google interview question

What is a simple device used in DWDM circuits to "cool" a signal.

Interview Answers

Anonymous

18 Nov 2016

I stated that I was not familiar with the term "cool" a signal. Perhaps if she had asked how one reduces power levels on an optic signal, I would have answered correctly.

Anonymous

13 Jan 2017

I've only heard of an attenuator being used to weaken the DB level on fiber.