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This is a very convenient form of amplifier for an optical fiber communication system since it is an in-line amplifier, thus removes the need to do the optical-electrical and electrical-optical conversion process. However, due to technical difficulties in fulfilling this RoHS Directive for some components and processes, including optical isolators, which are indispensable components for optical fiber communication systems, an accommodation was made in the RoHS regulations to allow exemptions for such cases and a less absolute standard of regulating lead content to below 1,000 ppm has been planned to be adopted, although it was expected that completely lead-free optical isolators would be developed soon. in optical fiber communication systems increases bandwidth by using many wavelength channels. |
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