Core-offset hollow core photonic bandgap fiber-based intermodal interferometer for strain and temperature measurements

Dong, Bo; Hao, Emily Jianzhong

doi:10.1364/ao.50.003011

Cited by 22 publications

(6 citation statements)

References 10 publications

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“…[l]. In Ref.[2], another simplified HCPCF with a similar structure but different dimensions is employed to fabricate LPGs in it.In this paper, we experimentally demonstrate an MZI based on an intermodal interference in the simplified HCPCF by simply splicing the HCPCF to SMFs with an appropriate core-offset [3]. Thanks to the special structure of the simplified HCPCF and air-guided property, the MZI shows almost insensitive to temperature, as low as 0±0.5 pmrC, but relatively high sensitivity to axial strain (-2.29 pmll-l£).…”

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confidence: 99%

Temperature-independent strain sensor based on simplified hollow-core photonic crystal fibers

Liu

Wang

et al. 2012

2012 Photonics Global Conference (PGC)

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Fiber sensors based on Mach-Zehnder interference have attracted considerable attention over the past few decades. All kinds of fibers, including standard single mode fiber (SMFs), multimode fiber (MMFs), photonic crystal fibers (PCFs) and other special fibers, have been explored to fabricate fiber-based Mach-Zehnder interferometers (MZIs) for various applications. Recently, a new type of PCF, so-called simplified hollow core photonic crystal fiber (HCPCF), is proposed by Frdric Grme et.al in Ref. [l]. In Ref.[2], another simplified HCPCF with a similar structure but different dimensions is employed to fabricate LPGs in it.In this paper, we experimentally demonstrate an MZI based on an intermodal interference in the simplified HCPCF by simply splicing the HCPCF to SMFs with an appropriate core-offset [3]. Thanks to the special structure of the simplified HCPCF and air-guided property, the MZI shows almost insensitive to temperature, as low as 0±0.5 pmrC, but relatively high sensitivity to axial strain (-2.29 pmll-l£). This device has a promising application as a temperature-independent strain sensor. Fig. 1. Cross-section of the simplified HCPCF. Fig. 2. Transmission spectrum of the MZIF.The simplified HCPCF used in our experiments is same as that in Ref. [2]. As shown in Fig. 1, it has a hexagonal hollow core and only one layer air-holes cladding. The diameters of the core, air-holes cladding and outer cladding are about 22 I-lm, 70 I-lm and 140 I-lm, respectively. The thickness of silica walls separating holes is no more than 370 nm.According to the mode investigation reported in [2], this simplified HCPCF can guide light with different modes. By means of appropriate core-offset, not only fundamental core mode but also some higher-order modes will be excited simultaneously. Since the fundamental core mode and higher-order modes have different effective refractive indices, the phase difference will be accumulated after propagating through a certain length of HCPCF. Finally, the interference is generated when they are coupled from the PCF to SMF. Fig. 2 illustrates the transmission spectrum of an interferometer containing a ,,-,29.65 mm length of the simplified HCPCF. As shown, the insertion loss of the MZI is about 7.5 dB, the extinction ratio ranges from "-' 10 dB to 17 dB, and the average fringe spacing is about 38 nm.Then, the sensing experiments are performed. When the interferometer is tensioned by increasing force, all the dips undergo similar wavelength-shift. Here, we characterize the strain-sensing performance of the MZI by monitoring the

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confidence: 99%

Temperature-independent strain sensor based on simplified hollow-core photonic crystal fibers

Liu

Wang

et al. 2012

2012 Photonics Global Conference (PGC)

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“…3(a)-(d). They can reflect that how many high order modes are excited and involved in the interferences [9]. In Fig.…”

Section: Measurements and Discussionmentioning

confidence: 94%

Micro Sagnac Loop Beat Wave Interferometer Based on High-Order Modes Coupling in Tightly Twisted Micro Fiber Tapers

Chen

Cheng

Chen

2013

IEEE Photon. Technol. Lett.

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We experimentally demonstrate a micro Sagnac loop beat wave interferometer by twisting a micro-tapered fiber with a diameter of the wavelength scale. The polarizationdependent coupling for the guided lights occurs at the interknitted region repeatedly while the loop serves as a mirror to reflect the guided lights. A longer interaction length of the interknitted region can lead to a narrower free spectral range. The high-order modes can be excited under a tightly twisted condition and the wavelength beating phenomenon can be more explicitly obtained after the multi-cycle coupling.Index Terms-Sagnac loop, wavelength beat, fiber taper.

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“…A majority of fiber sensors for temperature measurement by using specialty optical fiber or different kinds of micro-structure fiber such as photonic crystal fibers [1], multicore fiber [2], double cladding fiber [3], fiber gratings [4][5][6], tapered structure [7], core-offset structure [8] and so on. Each of them has advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Refractive index insensitive temperature sensor based on specialty triple-clad fiber

Xie

Zeng

et al. 2015

Opt. Express

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A refractive index (RI) insensitive temperature sensor based on specialty triple-clad fiber (STCF) is proposed. Based on coupling mode theory, the STCF can be equivalent to a rod waveguide and two tube waveguides. Then the cladding mode resonance characteristic of STCF is analyzed by calculating different mode dispersion curves, which indicates that it works only on the mode resonance from core to the fluorine-doped silica cladding, and finally a resonance wavelength can be obtained. Two straightforward experiments are performed to prove its sensing properties. Experimental results show that it has sensitivities of 72.17 pm/°C at temperature range from 35°C~95°C with characteristics of insensitive to external RI in the range from 1.3450 to 1.4607. Thus, this proposed sensor can be used for solution temperature monitoring in real time.

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Core-offset hollow core photonic bandgap fiber-based intermodal interferometer for strain and temperature measurements

Cited by 22 publications

References 10 publications

Temperature-independent strain sensor based on simplified hollow-core photonic crystal fibers

Temperature-independent strain sensor based on simplified hollow-core photonic crystal fibers

Micro Sagnac Loop Beat Wave Interferometer Based on High-Order Modes Coupling in Tightly Twisted Micro Fiber Tapers

Refractive index insensitive temperature sensor based on specialty triple-clad fiber

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