发明名称 |
System for measuring chromatic dispersion |
摘要 |
<p>To measure a chromatic dispersion value in an optical fiber in-service, an optical transmitter (10) multiplexes n signal lights carrying data Dl to Dn on optical carriers of frequency-modulated wavelengths different from each other and being phase-modulated to output into an optical fiber (12). A demultiplexer (30) demultiplexes the input light from the optical fiber (12) into the optical signals having the respective wavelengths. Photodetectors (32-1 to 32-n) convert the optical signals having the respective wavelengths into electric signals. Clock extractors (34-1 to 34-n) extract clock components of data D1 to Dn out of the outputs from the responding photodetectors (32-1 to 32-n). Data reproducers (36-1 to 36-n) reproduce the data Dl to Dn out of the respective outputs from the photodetectors (32-1 to 32-n). A phase-locked loop (PLL) composed of oscillators (38-1 to 38-n), multipliers (40-1 to 40-n), and loop filters (42-1 to 42-n) extracts FM modulation components out of the respective outputs from the clock extractors (34-1 to 34-n). FM component measuring apparatuses (44-1 to 44-n) measure amplitudes of FM modulation components and FM modulation frequencies, and calculators (46-1 to 46-n) calculate chromatic dispersion values at the respective wavelengths.</p> |
申请公布号 |
EP1381176(A2) |
申请公布日期 |
2004.01.14 |
申请号 |
EP20030014067 |
申请日期 |
2003.06.23 |
申请人 |
KDDI SUBMARINE CABLE SYSTEMS INC.;MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
TAGA, HIDENORI,;YAMAUCHI, HIROSHI |
分类号 |
G01J3/36;G01M11/02;H04B10/00;H04B10/079;H04B10/54;H04B10/548;H04J14/00;H04J14/02;(IPC1-7):H04B10/18 |
主分类号 |
G01J3/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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