发明名称 |
Optical transmitter-receiver |
摘要 |
A modulated electrical signal Smod produced upon amplitude-modulating a subcarrier having a high frequency (for example, a millimeter-wave band) by a baseband signal SBB to be transmitted and a main carrier MC outputted from a light source 110 are inputted to an external optical modulating portion 120 in an optical transmitter 101. The external optical modulating portion 120 amplitude-modulates the main carrier MC by the modulated electrical signal Smod, to output a double-modulated optical signal OSdmod to an optical filter portion 130. The optical filter portion 130 passes only a component of one of sidebands included in the double-modulated optical signal OSdmod, and outputs the component to an optical fiber 140 as an optical signal OS. An optical/electrical converting portion 150 in an optical receiver 102 optical/electrical-converts the optical signal OS transmitted through the optical fiber 140, to directly obtain a baseband signal SBB. Consequently, the optical receiver 102 is constructed simply and at low cost without requiring a wideband optical/electrical converting element for optical/electrical-converting a high-frequency electrical signal and a high-frequency electrical component (a frequency converter, a demodulator, a semirigid cable or a waveguide) which is very high in cost or is difficult to process. <IMAGE> |
申请公布号 |
EP0877495(A3) |
申请公布日期 |
2004.08.25 |
申请号 |
EP19980106639 |
申请日期 |
1998.04.09 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
SASAI, HIROYUKI;MAEDA, KAZUKI;UTSUMI, KUNIAKI |
分类号 |
H04B10/50;H04B10/572;(IPC1-7):H04B10/155;H04J14/02 |
主分类号 |
H04B10/50 |
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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