Investigation on Single-Mode-Multimode-Single-Mode Fiber Structure

Zhao, Yu; Jin, Yongxing; Liang, Houhui

doi:10.1109/sopo.2011.5780514

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…A scheme of a typical multimode fiber interferometer (MMI) sensor is presented in Figure 3, where a section of the multimode fiber (MMF) is sandwiched between two single-mode fibers (SMFs) [78]. This is the so-called single-mode-multimode-single mode (SMS) fiber structure; however, MMIs can also be obtained using a single-mode-multimode fiber configuration [79].…”

Section: Multimode Fiber Interferometers Sensorsmentioning

confidence: 99%

“…Some of the parameters that have been monitored with this kind of sensor are strain and temperature [80], displacement [81], refractive index [82], and microbend [83]. where a section of the multimode fiber (MMF) is sandwiched between two single-mode fibers (SMFs) [78]. This is the so-called single-mode-multimode-single mode (SMS) fiber structure; however, MMIs can also be obtained using a single-mode-multimode fiber configuration [79].…”

Section: Multimode Fiber Interferometers Sensorsmentioning

confidence: 99%

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Optical Fiber Temperature Sensors and Their Biomedical Applications

Roriz

Silva

Frazão

et al. 2020

Sensors

135

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The use of sensors in the real world is on the rise, providing information on medical diagnostics for healthcare and improving quality of life. Optical fiber sensors, as a result of their unique properties (small dimensions, capability of multiplexing, chemical inertness, and immunity to electromagnetic fields) have found wide applications, ranging from structural health monitoring to biomedical and point-of-care instrumentation. Furthermore, these sensors usually have good linearity, rapid response for real-time monitoring, and high sensitivity to external perturbations. Optical fiber sensors, thus, present several features that make them extremely attractive for a wide variety of applications, especially biomedical applications. This paper reviews achievements in the area of temperature optical fiber sensors, different configurations of the sensors reported over the last five years, and application of this technology in biomedical applications.

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Section: Multimode Fiber Interferometers Sensorsmentioning

confidence: 99%

Section: Multimode Fiber Interferometers Sensorsmentioning

confidence: 99%

Optical Fiber Temperature Sensors and Their Biomedical Applications

Roriz

Silva

Frazão

et al. 2020

Sensors

135

View full text Add to dashboard Cite

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“…There are usually two methods to solve this problem: beam propagation method (BPM) and mode propagation analysis (MPA). A lot of works have been reported using BPM [ 15 , 16 , 17 ]. It will take a long time to calculate the transmission spectrum of the SNCS structure with centimeter NCF by BPM.…”

Section: Introductionmentioning

confidence: 99%

Improved Numerical Calculation of the Single-Mode-No-Core-Single-Mode Fiber Structure Using the Fields Far from Cutoff Approximation

Shi

Yang

et al. 2017

Sensors

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Multimode interferometers based on the single-mode-no-core-single-mode fiber (SNCS) structure have been widely investigated as functional devices and sensors. However, the theoretical support for the sensing mechanism is still imperfect, especially for the cladding refractive index response. In this paper, a modified model of no-core fiber (NCF) based on far from cut-off approximation is proposed to investigate the spectrum characteristic and sensing mechanism of the SNCS structure. Guided-mode propagation analysis (MPA) is used to analyze the self-image effect and spectrum response to the cladding refractive index and temperature. Verified by experiments, the performance of the SNCS structure can be estimated specifically and easily by the proposed method.

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“…The cutoff value of the normalized frequency for any fiber depicts the evolution of the number of modes. Because the modes are excited through a fundamental mode (Gaussian beam), only the modes with circular symmetry (LP 0m , m 1; 2; 3…) would be propagating through the lead out fiber structure [25,26]. The superimposed output of these modes is again fed into the SMF and thus the transmittivity at the throughput port (P-2) is a consequence of interference of the propagating modes (LP 0m ) as well as superposition of the two counterpropagating beams (E 2c and E 2acw ).…”

Section: Stress Applied (Induced Birefringence) Over the Whole Lengthmentioning

confidence: 99%

“…When the DMF (OPTEL SMF-28) is excited with a fundamental mode (Gaussian beam) through a SMF at the operating wavelength of 633 nm, then only the modes with the Gaussian spatial distribution (circular symmetry), namely, the LP 01 and LP 02 modes each with two degenerate polarization modes, would be excited [25,26]. The appropriate core-to-core alignment and matching of the spot size is a precise requirement for the selected two-mode excitation and was achieved by joining the fibers (similar refractive index profile) under perfect alignment through an arc fusion splicer (FSM-60S) with a splice loss as low as ∼0.01 dB in our experiments.…”

Section: Experimental Setup and Working Principlementioning

confidence: 99%

Characteristics of transverse-stress-induced phase change through a distinct dual-mode fiber in a Sagnac loop

et al. 2013

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We report here the experimental realization of a fiber-optic transverse-stress sensor devised by a dual-mode optical-fiber segment in a standard Sagnac interferometer loop. The intermodal interference of the LP01 and LP02 modes of the dual-mode fiber (DMF) configuration is analyzed theoretically in the platform of polarization transmittance of the Sagnac loop in implementing the theoretical model. Several experimental measurements for various conditions of applied birefringence are studied at length and the results are compared with those estimated theoretically toward configuring a stress-measuring device. The study provides an understanding of the underlying physics of the working of DMF interference in a Sagnac configuration.

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Investigation on Single-Mode-Multimode-Single-Mode Fiber Structure

Cited by 10 publications

References 11 publications

Optical Fiber Temperature Sensors and Their Biomedical Applications

Optical Fiber Temperature Sensors and Their Biomedical Applications

Improved Numerical Calculation of the Single-Mode-No-Core-Single-Mode Fiber Structure Using the Fields Far from Cutoff Approximation

Characteristics of transverse-stress-induced phase change through a distinct dual-mode fiber in a Sagnac loop

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