????(Fiber-optic communication)??????,??????????(optical fiber)?????????

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????

• 98.10.02

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??

• ????(Fiber-optic communication)??????,??????????(o
  ptical fiber)?????????
• ?????????,?????(modulation)???????
• ?1980???,?????????????????????,??????????????????
• ???????????,????????????????????????????,?????????
  ????????????,????????????????????????,????????????

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?????????????
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(No Transcript)
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(No Transcript)
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??(cont.)

• ???????????????????,?????????,????????????????????
  ????????????,???????(attenuation)?????(interferenc
  e)????????,??????????????????,?????????

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??(cont.)

• ??????????,1990?????(optical amplifier)???????????
  ?,??????????????????,????????????2002??,??????????
  ???25???,???????????2.56Tb,???????????,?????2002??
  ??????????

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• 1966-???????Georgo.A.Hockham???????????????????
• 1976-???????????????????????45Mbit/s??110km???????
  ???
• Today-????????45Mbit/s??????40Gbit/s

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• ?????????????????????
• ????(transmitter)?????
• ???????,???????????????????????
• ????(receiver)?????,????????

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???????

• ????-??????,?????????????(?)???,??????????????????
  ?????????,??????transverse mode,??????????????
• ?????????????,????????????????????????????????????
  ??????????????????????????????????????????
• ??????????8?10µm???????????125 µm?????????1310?15
  50 nm?

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???????(cont.)

• ?????????(Step-Index multimode)????????(graded
  Index multimode)
• ????,??????????????????????????????????????????,??
  ??????,????LED?????,???????????????(Single-Mode)??
  ???
• ?????????????????????,????????????????????????????

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• ??????????????,?????10970µm??,????,?????,??????,
  ?????????????????????,???????????.
  ??????????????????????????????????.
  ?????????????1530ns/km

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????

• ????????? ??????????????????????,??????????,?????
  ??,????????????????????. ???????????????1ns/km???

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????

• ????????????????????,???????????????,?????????????
  ???510µm,????????125 µ m
• 1310nm ?1550nm ??????

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???????(????????)

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????????

• ???
• ??????????????????????????(light-emitting diode,
  LED)???????(laser diode)?LED??????????????????????
  ???(noncoherent),????????(coherent)???????????????
  ???????????????,??????????,??????????????????????,
  ?????????????

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????????

• ???
• ????LED??????????????(GaAsP),????????1300????,????
  ?810???870???????????

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??????
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• ??
• ??????????(core),??(cladding)?????????(protective
  coating)???????(refractive index)????????????????(
  silica glass)??,??????????????????????????????????
  ?????(acrylate)??,????????????,????????????,??????
  ??????,????????????????????????????,??????????????

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??????
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(No Transcript)
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(No Transcript)
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• ??????????,??????0.1mm??????????????,???????,?????
  ???????????????????????????????????????????????,??
  ??????????????
• ??,??????????????????????0.8?1.8um????????(0.85um)
  ?????(1.31um?1.55um)?????????????????,??,?????????
  ???????????????????????????????,??????????????????
  ???

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????????????,????????,??,?,?,?????????????,???????
??????????????.
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• ????ST connector

MTRJ connector
ST connector
FC connector
SC connector
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• ????
• ???????????????????????????????,??????????????????
  ????????????????????????????????????,?????????????
  ??,????????????????,????20??????????,?????????????

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• ???
• ????????????????(photodetector),??????????????????
  ???????????????????(photo diode),??p-n??????p-i-n?
  ??,????????(avalanche diode)??????-???-???(Metal-S
  emiconductor-Metal, MSM)??????????????,?????????(r
  egenerator)??????????

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• ??????
• ????????????????????????????(channel),????????????
  ?????????????????????????????????(wavelength
  division multiplexer)???????????????(wavelength
  division demultiplexer),??????????????????????(Arr
  ayed Waveguide Gratings, AWG)????????????????????/
  ????,?????????????80???,????????????????Tb/s???

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• ??????
• ????????,????????????,????????????????????????????
  ?-????,?????????(MHzkm)
• ?????????????????????????????,???????(trade
  off)?????,?????????(multi-mode fiber)?????-??????5
  00MHzkm,???????????????????500MHz,????????0.5???,
  ????????1000MHz

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??????????

• ??????????,???????????????,????????,??????????????
  ????????????,????????????,????????????????????????
  ????????????????,??????????????(cross-talk)???,???
  ????????(transmission line)????

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??????????

• ??????????????,?????????????
• ???????
• ????
• ????????????