发明名称 |
16 Quadrature Amplitude Modulation Optical Signal Transmitter |
摘要 |
An optical transmitter including a dividing optical coupler for dividing a lightwave onto optical paths; a first optical modulator in a first of the optical paths and driven by an I component of a first signal and a I component of a second signal for modulating the lightwave, a DC bias of the first optical modulator being at a quadrature point; a second optical modulator in a second of the optical paths and driven by a Q component of the first signal and a Q component of the second signal for modulating the lightwave, a DC bias of the second optical modulator being at the quadrature point; a phase shifter for generating a 90 degree phase shift in the Q components of the first and second signals that are modulated by the second optical coupler; and a combining optical coupler for combining the modulated lightwave from the first optical coupler and the phase shifted Q components of the first and second signals for generating a quadrature amplitude modulated signal.
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申请公布号 |
US2010329696(A1) |
申请公布日期 |
2010.12.30 |
申请号 |
US20090562260 |
申请日期 |
2009.09.18 |
申请人 |
NEC LABORATORIES AMERICA, INC. |
发明人 |
YU JIANJUN;WANG TING;QIAN DAYOU |
分类号 |
H04B10/04 |
主分类号 |
H04B10/04 |
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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