A variety of passive devices are used in communication systems to provide specific functions. Passive devices work without using an external power supply, while active devices need external power to work. Some common passive fiber optic devices are presented in detail in this chapter. Passive devices split, redirect, or combine light waves.
The most simple passive fiber optic devices are the couplers. Couplers couple multiple input light waves to multiple outputs. Normally, the couplers split input signals into two or more outputs, or combine two or more inputs into one output. ...
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