If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm， then what is the accumulated dispersion of an ITU wavelength after it travels 200 km？ （）
- A、 0 ps/nm
- B、 340 ps/nm
- C、 200 ps/nm
- D、 3400 ps/nm
- E、 More information is needed.
正确答案:D
答案解析:有
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