发明名称 |
Modulated and depolarized optical signal transmission system |
摘要 |
An optical communication system is described which includes an optical source; an optical modulator, receiving a transmission signal having frequencies included within a signal band and adapted to emit a modulated optical signal of a predetermined optical bandwidth; an optical transmission line comprising an optical fiber portion; and an optical receiver adapted to receive the optical signal in the presence of a predetermined SNR in the signal band, measured in a 5 MHz band. The telecommunication system further comprises, optically connected between the optical modulator and the optical transmission line, a depolarizer comprising two polarization-maintaining optical fiber portions, optically connected with each other in such a manner that the respective polarization axes form an angle of 45 DEG , in which the optical bandwidth, lengths and birefringence of the polarization-maintaining optical fibers are operatively selected so that the SNR at the receiver in the signal band does not differ more than 1 dB from the SNR at the receiver measured in a band of 5 MHz by substituting the optical fiber portion of the transmission line with a passive attenuator of same attenuation.
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申请公布号 |
US5910852(A) |
申请公布日期 |
1999.06.08 |
申请号 |
US19960759792 |
申请日期 |
1996.12.03 |
申请人 |
PIRELLI CAVI S.P.A. |
发明人 |
FONTANA, FLAVIO;FRANZOSO, FEDERICO;RAVASIO, GIUSEPPE;ZAMMARCHI, CLAUDIO |
分类号 |
G02B6/024;G02B27/28;H04B10/02;H04B10/04;H04B10/06;H04B10/135;H04B10/142;H04B10/152;H04B10/18;(IPC1-7):H04B10/00 |
主分类号 |
G02B6/024 |
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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