发明名称 |
OPTICAL MULTILEVEL SIGNAL TRANSMITTER, OPTICAL MULTILEVEL SIGNAL TRANSCEIVER, AND OPTICAL MULTILEVEL SIGNAL PROCESSING IC |
摘要 |
PROBLEM TO BE SOLVED: To improve distortion of a signal constellation and linearity of a transmission channel by correcting extinction degradation in an orthogonal photoelectric field modulator.SOLUTION: The optical multilevel signal transmitter includes: a multilevel coding circuit that codes an information signal to be transmitted into a photoelectric field modulation signal; an orthogonal photoelectric field modulator that modulates each of non-modulated laser beams on the basis of an in-phase component and an orthogonal component of a photoelectric field modulation signal and outputs its synthetic light as an optical multilevel signal; and an extinction degradation correction circuit that corrects extinction degradation of the orthogonal photoelectric field modulator on the basis of two driving signals of an in-phase driving signal and an orthogonal driving signal to be input into the orthogonal photoelectric field modulator. |
申请公布号 |
JP2014160985(A) |
申请公布日期 |
2014.09.04 |
申请号 |
JP20130031417 |
申请日期 |
2013.02.20 |
申请人 |
HITACHI LTD |
发明人 |
KIKUCHI NOBUHIKO |
分类号 |
H04B10/524;H04B10/588;H04L27/36 |
主分类号 |
H04B10/524 |
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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