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Measurement accuracy improvement with PZT scanning for detection of DPC in Hi-Bi fibers

Wencai Jing, Yimo Zhang, Ge Zhou, Feng Tang, and Haifeng Li

Open Access Open Access

Abstract

Piezo-electronic transducer is used in combination with mechanical scanning devices to improve measurement accuracy in a distributed polarization coupling detection system. For mechanical scanning range of 150 mm with 200-nm resolution, the measurement error of polarization-coupling intensity can be improved from 38% to 2% in combination with a 20-nm resolution piezo-electronic transducer.

©2002 Optical Society of America

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Figures (3)
Fig. 1
Fig. 1 Structure of the distributed polarization coupling detection system

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Fig. 2
Fig. 2 Relationship between the measurement accuracy and mechanical vibration

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Fig. 3
Fig. 3 Relationship between the measurement accuracy and PZT scanning resolution

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Equations (14)

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L max = OPD max B = 4 L 0 B
R s = L c B = 50 ( mm ) .
I ( l , Δ s ) = I d c + I a c
= I d c ( 1 + I a c I d c ) , ∣ Δ n b l − Δ s ∣ ≤ L c
= I d c { 1 + h 1 2 ( l ) exp [ − ( 2 ( Δ n b l − Δ s ) L c ) 2 ] } cos [ k 0 ( Δ n b l − Δ s ) ]
I ( l , Δ s ) = I d c , ∣ Δ n b l − Δ s ∣ > L c
h ( l ) = ( I ( l , Δ s ) avg I ( l , Δ s ) max ) 2 , ∣ Δ n b l − Δ s ∣ ≤ L c
Δ s add = 4 ∙ Δ x 0 ∙ rand ( 1 )
I ( l , Δ s ) = I d c { 1 + h 1 2 ( l ) exp [ − ( 2 ( Δ n b l − Δ s + Δ s add ) L c ) 2 ] } , ∣ Δ n b l − Δ s + Δ s add ∣ ≤ L c
∙ cos [ k 0 ( Δ n b l − Δ s + Δ s add ) ]
I ( l , Δ s ) = I d c , ∣ Δ n b l − Δ s + Δ s add ∣ > L c
I ( l , Δ s ) = I d c { 1 + h 1 2 ( l ) exp [ − ( 2 ( Δ n b l − Δ s + Δ s add + Δ s PZT ) L c ) 2 ] } ,
∙ cos [ k 0 ( Δ n b l − Δ s + Δ s add + Δ s PZT ) ]
I ( l , Δ s ) = I d c , when ∣ Δ n b l − Δ s + Δ s add + Δ s PZT ∣ > L c
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