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DELAY DIFFERENCE MEASURING METHOD FOR GROUP BETWEEN LP01 AND LP11 MODE BEAMS OF OPTICAL FIBER TO TRANSMIT LP01 AND LP11 MODE BEAMS
DELAY DIFFERENCE MEASURING METHOD FOR GROUP BETWEEN LP01 AND LP11 MODE BEAMS OF OPTICAL FIBER TO TRANSMIT LP01 AND LP11 MODE BEAMS
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机译：光纤LP01和LP11模式光束之间的群传输LP01和LP11模式光束的延迟差测量方法
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摘要
PURPOSE:To facilitate an easy measurement, by making the interference enable beams pass through the measured fiber for isolation into the LP01 and LP11 mode beams via the complex refraction polarizing element, giving the interference to these mode beams through the optical paths of different lengths and then measuring the group delay difference between both mode beams based on the optical path difference when the interference fringes becomes most clear. CONSTITUTION:Beam B which received the linear polarization and sent from light source 1 to emit interference enable beam A and interference enable light source 3 consisting of polarizer 2 enters via lens 4 measured optical fiber which transmits both the LP01 and LP11 mode beams. The radiation beam C is isolated into LP01 mode beam D and LP11 mode beam E via lens 6 and complex refraction polarizing element 7 each. Beam D is reflected by reflector 9 after passing through variable delay medium 8 to then enter compounder 10; while beam E enters compounder 10 via variable delay medium 11 and polarizer 11 each. Beam J which caused the interference at compounder 10 gives the interference fringes 14 onto projection secreen 13. Thus the group delay difference between the both mode beams of the measured optical fiber can be measured easily with a high accuracy based on the optical path difference when fringes 14 become most clear.
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