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Which features of an optical isolator makes it attractive to use with optical amplifier? 

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This makes it very attractive for actual optical isolator fabrications.
With these advantages, the amplifier can be applied as an optical narrowband filter.
Here, we demonstrate that a traditional travelling-wave modulator can effectively function as an optical isolator, when driven under a prescribed modulation condition.
This technology will lead to the efficient production of the optical isolator used in optical systems.
This interesting isolator may have promising applications in access optical networks.
This result is an important step toward achieving a practical integrated optical isolator.
The results are encouraging to propose an optical isolator.
These results are promising for miniaturization of the setup without a need for a bulky optical isolator.

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