Novel birefringence interrogation for Sagnac loop interferometer sensor with unlimited linear measurement range

He, Haijun; Shao, Liyang; Qian, Heng; Zhang, Xinpu; Liang, Jiawei; Luo, Bin; Pan, Wei; Yan, Lianshan

doi:10.1364/oe.25.006832

Cited by 18 publications

(3 citation statements)

References 17 publications

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“…Among various conventional thermal-sensing systems, optical sensing technologies are finding increasing interest and applications due to their selectivity, immunity to electromagnetic interference and the capability for multiplexing and remote sensing. For the past few decades, various optical structures, such as waveguides [27][28][29] , photonic crystal fibres [30][31][32] , and Sagnac interferometers [33][34][35] , have been developed for thermal sensing. However, accurate temperature sensing with high resolution based on single-pass (waveguide or fibre) optical sensors is challenging due to the limited optical sensing path.…”

Section: Introductionmentioning

confidence: 99%

Optical whispering-gallery mode barcodes for high-precision and wide-range temperature measurements

2021

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Temperature is one of the most fundamental physical properties to characterize various physical, chemical, and biological processes. Even a slight change in temperature could have an impact on the status or dynamics of a system. Thus, there is a great need for high-precision and large-dynamic-range temperature measurements. Conventional temperature sensors encounter difficulties in high-precision thermal sensing on the submicron scale. Recently, optical whispering-gallery mode (WGM) sensors have shown promise for many sensing applications, such as thermal sensing, magnetic detection, and biosensing. However, despite their superior sensitivity, the conventional sensing method for WGM resonators relies on tracking the changes in a single mode, which limits the dynamic range constrained by the laser source that has to be fine-tuned in a timely manner to follow the selected mode during the measurement. Moreover, we cannot derive the actual temperature from the spectrum directly but rather derive a relative temperature change. Here, we demonstrate an optical WGM barcode technique involving simultaneous monitoring of the patterns of multiple modes that can provide a direct temperature readout from the spectrum. The measurement relies on the patterns of multiple modes in the WGM spectrum instead of the changes of a particular mode. It can provide us with more information than the single-mode spectrum, such as the precise measurement of actual temperatures. Leveraging the high sensitivity of WGMs and eliminating the need to monitor particular modes, this work lays the foundation for developing a high-performance temperature sensor with not only superior sensitivity but also a broad dynamic range.

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Section: Introductionmentioning

confidence: 99%

Optical whispering-gallery mode barcodes for high-precision and wide-range temperature measurements

2021

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“…Side polished D-shaped fiber [5], fiber Bragg grating [6], long-period fiber grating [7] based SPR sensors were mostly used optical fiber-based SPR sensors over the past years. Interferometric based optical fiber sensors were also employed for successful measurement of the chemical and biochemical analyte [8,9]. The fabrication and designing of interferometric sensors are complex and the optimization of the fabrication process is crucial to achieving superior performance.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Sensitivity Enhancement of D-Shaped Fiber-Based Sandwiched Structure Optofluidic Sensor

et al. 2020

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A novel mechanism of sensitivity enhancement of D-shaped fiber-based surface plasmon resonance (SPR) sensors for the optofluidic device has been proposed. The sandwiched structure optofluidic platform is developed with metal-coated D-shaped fiber as the sensing device, while another thin metal layer is situated under the inner wall of the substrate as a second metal layer to construct the sandwiched microchannel. It has been found that the sensitivity of the D-type fiber SPR sensor is enhanced significantly with the sandwiched metal-coated structure of microchannel. In the proposed structure, the measurand analyte is considered as a sandwich channel layer between two thin metal layers. The sensitivity of the proposed structure is dependent on the volume of the measurand and the thickness of the metal layers. The computed sensitivity with a double metal layer and sandwich measurand layer concept is ~ 4085 nm/RIU in the region of 1.33 to 1.36. The sensitivity is enhanced by more than a factor of '2.3' in comparison with the sensitivity of the normal D-shape fiber SPR sensor. It can be enhanced further up to ~ 12,500 nm/RIU by the deposition of higher RI polymeric overlay just above the second metal layer. The computed resolution of the proposed sensor with standard interrogation technique is ~ 1x10-7 which is quite competitive within the optical fiber sensor domain. A detailed numerical analysis has been accomplished. This structure will be useful in distinct chemical and biological sensing applications where the volume of an analyte is critical. This new concept of enhancement of sensitivity with limited measurand volume will open a new designing methodology for optical fiber biosensors.

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“…Optical fiber comb filters, a key component with compact size and good compatibility with the fiber systems are widely used in the multiwavelength fiber lasers 1 and optical networks 2 to process the optical signals and isolate the neighboring channel signals and to reduce the cross-talk. A variety of techniques have been proposed to realize all-fiber comb filter function such as fiber Bragg grating filters 3 – 5 , Sagnac loop interferometers 6 – 8 , Fabry–Perot filters 9 – 11 , birefringent fiber filters 12 and Mach-Zehnder (M-Z) filters 13 – 16 . However, these techniques suffer from the disadvantages of high cost and complex fabrication.…”

Section: Introductionmentioning

confidence: 99%

A simple all-fiber comb filter based on the combined effect of multimode interference and Mach-Zehnder interferometer

Zhou

Kumar

et al. 2018

Sci Rep

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A polarization-dependent all-fiber comb filter based on a combination effect of multimode interference and Mach-Zehnder interferometer was proposed and demonstrated. The comb filter was composed with a short section of multimode fiber (MMF) fusion spliced with a conventional single mode fiber on the one side and a short section of a different type of optical fiber on the other side. The second type of optical fiber is spliced to the MMF with a properly designed misalignment. Different types and lengths of fibers were used to investigate the influence of fiber types and lengths on the performance of the comb filter. Experimentally, several comb filters with free spectral range (FSR) values ranging from 0.236 to 1.524 nm were achieved. The extinction ratio of the comb filter can be adjusted from 6 to 11.1 dB by varying polarization states of the input light, while maintaining the FSR unchanged. The proposed comb filter has the potential to be used in optical dense wavelength division multiplexing communication systems.

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Novel birefringence interrogation for Sagnac loop interferometer sensor with unlimited linear measurement range

Cited by 18 publications

References 17 publications

Optical whispering-gallery mode barcodes for high-precision and wide-range temperature measurements

Optical whispering-gallery mode barcodes for high-precision and wide-range temperature measurements

Anomalous Sensitivity Enhancement of D-Shaped Fiber-Based Sandwiched Structure Optofluidic Sensor

A simple all-fiber comb filter based on the combined effect of multimode interference and Mach-Zehnder interferometer

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