Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems？（）
- A、 PIN photodiodes
- B、 zero-chirped lasers
- C、 Erbium-doped fiber amplifiers
- D、 dispersion compensating fiber
- E、 dispersion compensating Bragg grating
正确答案:B,D,E
答案解析:有
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