Nondestructive method to measure coupling and propagation losses in optical guided structures

Thanh-Nam Nguyen; Kevin Lengle; Monique Thual; Philippe Rochard; Mathilde Gay; Laurent Bramerie; Stefania Malaguti; Gaetano Bellanca; Sy Dat Le; Thierry Chartier

doi:10.1364/JOSAB.29.003393

Journal of the Optical Society of America B
Vol. 29,
Issue 12,
pp. 3393-3397
(2012)
•https://doi.org/10.1364/JOSAB.29.003393

Nondestructive method to measure coupling and propagation losses in optical guided structures

Thanh-Nam Nguyen, Kevin Lengle, Monique Thual, Philippe Rochard, Mathilde Gay, Laurent Bramerie, Stefania Malaguti, Gaetano Bellanca, Sy Dat Le, and Thierry Chartier

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Thanh-Nam Nguyen, Kevin Lengle, Monique Thual, Philippe Rochard, Mathilde Gay, Laurent Bramerie, Stefania Malaguti, Gaetano Bellanca, Sy Dat Le, and Thierry Chartier, "Nondestructive method to measure coupling and propagation losses in optical guided structures," J. Opt. Soc. Am. B 29, 3393-3397 (2012)

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Table of Contents Category
- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: July 11, 2012
- Revised Manuscript: October 16, 2012
- Manuscript Accepted: October 31, 2012
- Published: November 27, 2012

Abstract

We propose and demonstrate a nondestructive method for loss measurement in optical guided structures. In the proposed approach, the device under test does not require connectors at its ends, thus making this technique available for both optical fibers and integrated optical waveguides. The loss measurement is feasible over a broad range, from low ( $0.2 dB / km$ ) to high (of the order of $1 dB / mm$ ) loss values. This method is validated through measurements performed on a microstructured holey fiber and on a photonic-crystal waveguide. The obtained results are in good agreement with theoretical calculations and measurements obtained by other approaches.

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	Description of setup	Measured Powers	Deduced Value
1	Measure the power at the output of lensed fiber AB.	$P_{0} = 2.0 dBm$ $P_{B}^{+} = 1.5 dBm$	$L_{AB} = 0.5 dB$
2	Insert the objective in front of lensed fiber AB.	$P_{B^{+}}^{*} = - 0.26 dBm$	$L_{BD} = 4.08 dB$
2	Make an optimized coupling between injecting lensed fiber AB and the PhC waveguide in front of the objective with the output (point D) at the same place as point B in the previous step [see Fig. 2(a)].	$P_{D^{+}}^{*} = - 4.34 dBm$	$L_{BD} = 4.08 dB$
3	Make an optimized coupling between injecting lensed fibers and the PhC waveguide.	$P_{F}^{+} = - 5.72 dBm$	$L_{AF} = 7.72 dB$
4	The direction of light now is from F to A with the same optimized coupling between coupling fibers and DUT as in the previous step.	$P_{A}^{-} = - 5.78 dBm$	$L_{FA} = 7.78 dB$ (quite similar to the value $L_{AF}$ )
5	Remove the lensed fiber AB. Insert the objective at the output (point C) of the PhC waveguide.	$P_{C^{-}}^{*} = - 4.10 dBm$	$L_{EC} = 3.82 dB$ (supposed to be equal to $L_{CE}$ )
5	Remove the PhC waveguide. Advance the lensed fiber EF so that the point E occupies the previous position of point C [see Fig. 2(b)].	$P_{E^{-}}^{*} = - 0.28 dBm$	$L_{EC} = 3.82 dB$ (supposed to be equal to $L_{CE}$ )
6	Remove the objective.	$P_{E}^{-} = 1.5 dBm$	$L_{FE} = 0.5 dB$ (supposed to be equal to $L_{EF}$ )

$P_{0}$	$P_{F}^{+}$	$P_{D}^{+}$	$P_{B}^{+}$	$P_{A}^{-}$	$P_{C}^{-}$	$P_{E}^{-}$
0.80	$- 13.08$	$- 9.25$	0.10	$- 13.06$	$- 9.08$	0.49

	Description of setup	Measured Powers	Deduced Value
1	Measure the power at the output of lensed fiber AB.	$P_{0} = 2.0 dBm$ $P_{B}^{+} = 1.5 dBm$	$L_{AB} = 0.5 dB$
2	Insert the objective in front of lensed fiber AB.	$P_{B^{+}}^{*} = - 0.26 dBm$	$L_{BD} = 4.08 dB$
2	Make an optimized coupling between injecting lensed fiber AB and the PhC waveguide in front of the objective with the output (point D) at the same place as point B in the previous step [see Fig. 2(a)].	$P_{D^{+}}^{*} = - 4.34 dBm$	$L_{BD} = 4.08 dB$
3	Make an optimized coupling between injecting lensed fibers and the PhC waveguide.	$P_{F}^{+} = - 5.72 dBm$	$L_{AF} = 7.72 dB$
4	The direction of light now is from F to A with the same optimized coupling between coupling fibers and DUT as in the previous step.	$P_{A}^{-} = - 5.78 dBm$	$L_{FA} = 7.78 dB$ (quite similar to the value $L_{AF}$ )
5	Remove the lensed fiber AB. Insert the objective at the output (point C) of the PhC waveguide.	$P_{C^{-}}^{*} = - 4.10 dBm$	$L_{EC} = 3.82 dB$ (supposed to be equal to $L_{CE}$ )
5	Remove the PhC waveguide. Advance the lensed fiber EF so that the point E occupies the previous position of point C [see Fig. 2(b)].	$P_{E^{-}}^{*} = - 0.28 dBm$	$L_{EC} = 3.82 dB$ (supposed to be equal to $L_{CE}$ )
6	Remove the objective.	$P_{E}^{-} = 1.5 dBm$	$L_{FE} = 0.5 dB$ (supposed to be equal to $L_{EF}$ )

$P_{0}$	$P_{F}^{+}$	$P_{D}^{+}$	$P_{B}^{+}$	$P_{A}^{-}$	$P_{C}^{-}$	$P_{E}^{-}$
0.80	$- 13.08$	$- 9.25$	0.10	$- 13.06$	$- 9.08$	0.49

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Journal of the Optical Society of America B