Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating

Qi Zhang; Natale J. Ianno; Ming Han

doi:10.3390/s130708827

Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating

Qi Zhang, Natale J. Ianno, Ming Han

Electrical & Computer Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We present a compact and highly-sensitive fiber-optic refractometer based on a high-Q π -phase-shifted fiber-Bragg-grating (π FBG) that is chemically etched to the core of the fiber. Due to the π phase-shift, a strong π FBG forms a high-Q optical resonator and the reflection spectrum features an extremely narrow notch that can be used for highly sensitivity refractive index measurement. The etched π FBG demonstrated here has a diameter of ~9.3 μm and a length of only 7 mm, leading to a refractive index responsivity of 2.9 nm/RIU (RIU: refractive index unit) at an ambient refractive index of 1.318. The reflection spectrum of the etched π FBG features an extremely narrow notch with a linewidth of only 2.1 pm in water centered at ~1,550 nm, corresponding to a Q-factor of 7.4 × 10⁵, which allows for potentially significantly improved sensitivity over refractometers based on regular fiber Bragg gratings.

Original language	English (US)
Pages (from-to)	8827-8834
Number of pages	8
Journal	Sensors (Switzerland)
Volume	13
Issue number	7
DOIs	https://doi.org/10.3390/s130708827
State	Published - Jul 2013

Keywords

Fiber gratings
Optical fiber sensors
Optical resonators
Refractive index

ASJC Scopus subject areas

Analytical Chemistry
Information Systems
Atomic and Molecular Physics, and Optics
Biochemistry
Instrumentation
Electrical and Electronic Engineering

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10.3390/s130708827

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title = "Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating",

abstract = "We present a compact and highly-sensitive fiber-optic refractometer based on a high-Q π -phase-shifted fiber-Bragg-grating (π FBG) that is chemically etched to the core of the fiber. Due to the π phase-shift, a strong π FBG forms a high-Q optical resonator and the reflection spectrum features an extremely narrow notch that can be used for highly sensitivity refractive index measurement. The etched π FBG demonstrated here has a diameter of ~9.3 μm and a length of only 7 mm, leading to a refractive index responsivity of 2.9 nm/RIU (RIU: refractive index unit) at an ambient refractive index of 1.318. The reflection spectrum of the etched π FBG features an extremely narrow notch with a linewidth of only 2.1 pm in water centered at ~1,550 nm, corresponding to a Q-factor of 7.4 × 105, which allows for potentially significantly improved sensitivity over refractometers based on regular fiber Bragg gratings.",

keywords = "Fiber gratings, Optical fiber sensors, Optical resonators, Refractive index",

author = "Qi Zhang and Ianno, {Natale J.} and Ming Han",

year = "2013",

month = jul,

doi = "10.3390/s130708827",

language = "English (US)",

volume = "13",

pages = "8827--8834",

journal = "Sensors (Switzerland)",

issn = "1424-8220",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "7",

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T1 - Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating

AU - Zhang, Qi

AU - Ianno, Natale J.

AU - Han, Ming

PY - 2013/7

Y1 - 2013/7

N2 - We present a compact and highly-sensitive fiber-optic refractometer based on a high-Q π -phase-shifted fiber-Bragg-grating (π FBG) that is chemically etched to the core of the fiber. Due to the π phase-shift, a strong π FBG forms a high-Q optical resonator and the reflection spectrum features an extremely narrow notch that can be used for highly sensitivity refractive index measurement. The etched π FBG demonstrated here has a diameter of ~9.3 μm and a length of only 7 mm, leading to a refractive index responsivity of 2.9 nm/RIU (RIU: refractive index unit) at an ambient refractive index of 1.318. The reflection spectrum of the etched π FBG features an extremely narrow notch with a linewidth of only 2.1 pm in water centered at ~1,550 nm, corresponding to a Q-factor of 7.4 × 105, which allows for potentially significantly improved sensitivity over refractometers based on regular fiber Bragg gratings.

AB - We present a compact and highly-sensitive fiber-optic refractometer based on a high-Q π -phase-shifted fiber-Bragg-grating (π FBG) that is chemically etched to the core of the fiber. Due to the π phase-shift, a strong π FBG forms a high-Q optical resonator and the reflection spectrum features an extremely narrow notch that can be used for highly sensitivity refractive index measurement. The etched π FBG demonstrated here has a diameter of ~9.3 μm and a length of only 7 mm, leading to a refractive index responsivity of 2.9 nm/RIU (RIU: refractive index unit) at an ambient refractive index of 1.318. The reflection spectrum of the etched π FBG features an extremely narrow notch with a linewidth of only 2.1 pm in water centered at ~1,550 nm, corresponding to a Q-factor of 7.4 × 105, which allows for potentially significantly improved sensitivity over refractometers based on regular fiber Bragg gratings.

KW - Fiber gratings

KW - Optical fiber sensors

KW - Optical resonators

KW - Refractive index

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ER -

Fiber-Optic Refractometer Based on an Etched High-Q π-Phase-Shifted Fiber-Bragg-Grating

Abstract

Keywords

ASJC Scopus subject areas

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