Rectangular QPSK for Generation of Optical 8PSK
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概要
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Different from the symmetric square-shape constellation generated by a conventional QPSK (quadrature phase-shift keying) transmitter, a QPSK with a rectangular-shape constellation (i.e. rectangular QPSK) is expected to be obtained when driving an in-phase/quadrature (IQ) modulator in an unbalanced manner. It could be applied to generate multilevel modulation format, like eight-ary phase-shift keying (8PSK). In this paper, we propose and experimentally demonstrate an optical 8PSK transmitter using two tandem IQ modulators. A 30-Gb/s 8PSK is successfully generated through cascading a rectangular QPSK and a square QPSK.
- 2011-07-04
著者
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Lu Guo-wei
National Institute Of Information And Communications Technology
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SAKAMOTO Takahide
National Institute of Information and Communications Technology
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Lu Guo-wei
National Institute Of Information And Technology(nict)
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Kawanishi Tetsuya
National Inst. Of Information And Technol. (nict) Tokyo Jpn
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Kawanishi Tetsuya
National Institute Of Information And Technology(nict)
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Sakamoto Takahide
National Institute of Information and Communication Technology
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