发明名称 |
Optical time domain reflectometry system - uses complementary pseudo-random pulse sequence for compensating reflections |
摘要 |
The reflectrometry system uses a pseudo-random pulse sequence for modulation of laser light fed to an optical fibre (13), with the detected back scattered signal correlated with the pseudo-random pulse sequence. The interference reflections are compensated using a complementary pseudo-random pulse sequence (12a) which is delayed for a given interval before superimposing it on the back scattered signal, with suppressed reflection converted into a DC component. Pref. an auxiliary laser (16) is modulated by the complementary pseudo-random pulse sequence, its light fed to one arm of an optical coupler for optical compensation of the back scattered signal. ADVANTAGE - Reduced dynamic losses.
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申请公布号 |
CH677281(A5) |
申请公布日期 |
1991.04.30 |
申请号 |
CH19880003222 |
申请日期 |
1988.08.30 |
申请人 |
ASEA BROWN BOVERI AG |
发明人 |
BUSER, WERNER;SCHAD, HANSPETER, DR. |
分类号 |
G01M11/00 |
主分类号 |
G01M11/00 |
代理机构 |
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