发明名称 |
Optical regeneration circuit for regenerating signal with deteriorated signal to noise ratio by means of saturable absorption element |
摘要 |
An optical transmission system having an optical regeneration circuit for regenerating a signal with a deteriorated signal to noise ratio. A signal light at wavelength lambd1 which includes a noise light is composed with a continuous light at wavelength lambd2 outputted from a light source to obtain a composed signal light in an optical coupler. The composed signal light is passed through a saturable absorption type optical element which transmits only the signal light having a light intensity equal to or greater than a threshold value, thereby removing the included noise light. From the signal light, only the signal at the same wavelength lambd2 as the wavelength of the continuous light is extracted by a wavelength divider and data signal of the incident signal light is replicated in the continuous light and outputted. Thus, a signal light having no deterioration of the signal to noise ratio at wavelength lambd2 can be regenerated from the signal light having the deteriorated signal to noise ratio.
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申请公布号 |
US6504637(B1) |
申请公布日期 |
2003.01.07 |
申请号 |
US19990266069 |
申请日期 |
1999.03.10 |
申请人 |
NEC CORPORATION |
发明人 |
YOKOYAMA RYU;ISHII SATOSHI |
分类号 |
G02F2/02;H04B10/02;H04B10/04;H04B10/06;H04B10/14;H04B10/16;H04B10/17;H04B10/18;(IPC1-7):H04B10/02 |
主分类号 |
G02F2/02 |
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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