Coherent acousto-optic mode coupling in dispersion- compensating fiber by two acoustic gratings with orthogonal vibration directions

P. Z. Dashti; Q. Li; C.-H. Lin; H. P. Lee

doi:10.1364/OL.28.001403

Coherent acousto-optic mode coupling in dispersion-compensating fiber by two acoustic gratings with orthogonal vibration directions

P. Z. Dashti, Q. Li, C.-H. Lin, and H. P. Lee

Optics Letters
Vol. 28,
Issue 16,
pp. 1403-1405
(2003)
•https://doi.org/10.1364/OL.28.001403

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P. Z. Dashti, Q. Li, C.-H. Lin, and H. P. Lee, "Coherent acousto-optic mode coupling in dispersion- compensating fiber by two acoustic gratings with orthogonal vibration directions," Opt. Lett. 28, 1403-1405 (2003)

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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Gratings (050.2770)
- Fiber optics (060.2310)
- Acousto-optical devices (230.1040)

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Abstract

The acousto-optic mode coupling from core to ${LP}_{11}^{cl}$ mode of a dispersion-compensating fiber excited by two acoustic waves with orthogonal perturbations is studied by use of a novel composite piezoelectric transducer. Highly polarization-dependent mode-selective spectra are observed that are due to coherent acousto-optic coupling between the core and various constituent cladding modes. Potential applications for implementing an all-fiber wavelength-tunable polarization analyzer are also discussed.

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Core Mode Polarization	Acoustic Polarization	Normalized coupling Coefficient $K_{i, j}^{i}$ (i and j = x, y)
Core Mode Polarization	Acoustic Polarization	TE₀₁	TM₀₁	HE₂₁(0°)	HE₂₁(45°)
$E_{y}^{c o}$ ↑	$A_{y}$ ↑	0	1	1	0
$E_{x}^{c o}$ →	$A_{y}$ ↑	1	0	0	1
$E_{y}^{c o}$ ↑	$A_{x}$ →	-1	0	0	1
$E_{x}^{c o}$ →	$A_{x}$ →	0	1	-1	0

Core Mode/Acoustic Wave Polarization					Relative Amplitude of Cladding Mode $(κ_{ij} E_{i}^{co} A_{j})$
	Core Mode Field		Acoustic Wave		TE	TM	HE(0°)	HE(45°)
	$E_{x}^{co}$	$E_{y}^{co}$	$A_{x}$	$A_{y}$	$E_{x}^{co} A_{y}^{} - E_{y}^{co} A_{x}^{}$	$E_{x}^{co} A_{x}^{} + E_{y}^{co} A_{y}^{}$	$E_{y}^{co} A_{y}^{} - E_{x}^{co} A_{x}^{}$	$E_{x}^{co} A_{y}^{} + E_{y}^{co} A_{x}^{}$
CW/CW	1	$i$	1	$i$	$- 2 i$	2	0	0
CCW/CW	1	$- i$	1	$i$	0	0	$- 2$	$- 2 i$
CW/CCW	1	$i$	1	$- i$	0	0	$- 2$	$2 i$
CCW/CCW	1	$- i$	1	$- i$	$2 i$	2	0	0

Core Mode Polarization	Acoustic Polarization	Normalized coupling Coefficient $K_{i, j}^{i}$ (i and j = x, y)
Core Mode Polarization	Acoustic Polarization	TE₀₁	TM₀₁	HE₂₁(0°)	HE₂₁(45°)
$E_{y}^{c o}$ ↑	$A_{y}$ ↑	0	1	1	0
$E_{x}^{c o}$ →	$A_{y}$ ↑	1	0	0	1
$E_{y}^{c o}$ ↑	$A_{x}$ →	-1	0	0	1
$E_{x}^{c o}$ →	$A_{x}$ →	0	1	-1	0

Core Mode/Acoustic Wave Polarization					Relative Amplitude of Cladding Mode $(κ_{ij} E_{i}^{co} A_{j})$
	Core Mode Field		Acoustic Wave		TE	TM	HE(0°)	HE(45°)
	$E_{x}^{co}$	$E_{y}^{co}$	$A_{x}$	$A_{y}$	$E_{x}^{co} A_{y}^{} - E_{y}^{co} A_{x}^{}$	$E_{x}^{co} A_{x}^{} + E_{y}^{co} A_{y}^{}$	$E_{y}^{co} A_{y}^{} - E_{x}^{co} A_{x}^{}$	$E_{x}^{co} A_{y}^{} + E_{y}^{co} A_{x}^{}$
CW/CW	1	$i$	1	$i$	$- 2 i$	2	0	0
CCW/CW	1	$- i$	1	$i$	0	0	$- 2$	$- 2 i$
CW/CCW	1	$i$	1	$- i$	0	0	$- 2$	$2 i$
CCW/CCW	1	$- i$	1	$- i$	$2 i$	2	0	0

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