All fiber compact bending sensor with high sensitivity based on a multimode fiber embedded chirped long-period grating

Zhang, Shuo; Geng, Tao; Niu, Huiwen; Li, Xiang; Yan, Yongde; Sun, Cuiting; Deng, Sifan; Wang, Zemin; Wang, Shengjia; Yang, Wenlei; Sun, Weimin; Yuan, Libo

doi:10.1364/ol.396301

Cited by 29 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several studies have been carried out involving a combination of an LPG with an SMS fiber structure [153][154], and some interesting research has been undertaken to fabricate an LPG using fusion splices at precise intervals with different types of fibers, such as MMF and SMF ( Fig. 8(i)) [155][156][157][158], MMF and NCF [159].…”

Section: E Combinations Of Sms Fiber Structuresmentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

114

View full text Add to dashboard Cite

A singlemode-multimode-singlemode (SMS) fiber structure consists of a short section of multimode fiber fusionspliced between two SMS fibers. The mechanism underpinning the operation of an SMS fiber structure is multimode interference and associated self-imaging. SMS structures can be used in a variety of optical fiber systems but are most commonly used as sensors for a variety of parameters, ranging from macro-world measurands such as temperature, strain, vibration, flow rate, RI and humidity to the micro-world with measurands such as proteins, pathogens, DNA, and specific molecules. While traditional SMS structures employ a short section of standard multimode fiber, a large number of structures have been investigated and demonstrated over the last decade involving the replacement of the multimode fiber section with alternatives such as a hollow core fiber or a tapered fiber. The objective of replacing the multimode fiber has most often been to allow sensing of different measurands or to improve sensitivity. In this paper, several different categories of SMS fiber structures, including traditional SMS, modified SMS and tapered SMS fiber structures are discussed with some theoretical underpinning and reviews of a wide variety of sensing examples and recent advances. The paper then summarizes and compares the performances of a variety of sensors which have been published under a number of headings. The paper concludes by considering the challenges faced by SMS based sensing schemes in terms of their deployment in real world applications and discusses possible future developments of SMS fiber sensors.

show abstract

Section: E Combinations Of Sms Fiber Structuresmentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

114

View full text Add to dashboard Cite

show abstract

“…It is necessary for a sensor to recognize the bending orientation in the monitoring of building walls, bridge piles, and road surfaces. However, traditional LPFGs are usually axisymmetric about the transmission axis, so it is difficult to use them in identifying bending directions [4] .…”

Section: Introductionmentioning

confidence: 99%

Vector bending sensor based on chirped long-period grating with off-axis micro-helix taper

Zhou¹,

He²,

Chen³

et al. 2023

中国光学快报

Self Cite

View full text Add to dashboard Cite

Vector bending sensing has been consistently growing in many fields. A low-cost and high sensitivity vector bending sensor based on a chirped long-period fiber grating (LPFG) with an off-axis micro helix taper is proposed and experimentally demonstrated. The grating is composed of several sections of single-mode fiber with gradually larger lengths, and the off-axis micro helix tapers with fixed lengths when they are fabricated by using the arc discharge technology. The large refractive index modulation in the micro-helix taper greatly reduces the sensor size. The total length of the sensor is only 4.67 mm. The micro-helix taper-based LPFG can identify the bending direction due to the asymmetric structure introduced by the micro helix. The experimental results show that the transmission spectra of the sensor have distinct responses for different bending directions, and the maximum bending sensitivity is 14.08 nm/m −1 in the range from 0.128 m −1 to 1.28 m −1 . The proposed bending sensor possesses pronounced advantages, such as high sensitivity, small size, low cost, and orientation identification, and offers a very promising method for bend measurement.

show abstract

“…Using thulium-doped fiber as a gain medium, a laser can be excited in the 2-μm band with a higher self-focusing threshold and lower nonlinear effect than in the nearinfrared band [7,8]. Such a laser poses little risk to the eyes and finds applications in various fields, including laser radar, laser communication, and environmental remote sensing [9][10][11]. As one of the ideal signal sources in a wavelength-division multiplexing (WDM) system, the flexible wavelength switching of thulium-doped fiber lasers (TDFL) is an important indicator, and various structures of comb filters are widely utilized [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Switchable Multi-Wavelength Thulium-Doped Fiber Laser Using a Cascaded or Two-Segment Sagnac Loop Filter

Feng

Cheng

et al. 2022

IEEE Access

View full text Add to dashboard Cite

A switchable multi-wavelength thulium-doped fiber laser (TDFL) using either two-stage cascaded or two-segment Sagnac loop filters are proposed and analyzed. Both filters incorporate a 3-m and 1.7-m long polarization-maintaining fiber, which acts as a comb filter. By adjusting two polarization controllers, when the TDFL used a cascaded Sagnac loop filter, eight stable single-wavelength operations were obtained with easy switching among them. The wavelength range was 16.36 nm during the singlewavelength switchable operation, with the optical signal-to-noise ratio up to 55 dB. This TDFL can achieve at most quintuple-wavelength operation. When the TDFL used a two-segment Sagnac loop filter, we achieved single-wavelength and dual-wavelength switchable. This TDFL can achieve at most stable quadruple-wavelength operation. In dual-wavelength switchable operation, the maximum and minimum wavelength spacings were 21.78 nm and 1.50 nm. Due to its abundant range of wavelengths, the proposed TDFLs has great potential in wavelength-division multiplexing.INDEX TERMS Multi-wavelength thulium-doped fiber laser, wavelength switchable, cascaded Sagnac loop filter, two-segment Sagnac loop filter.

show abstract

All fiber compact bending sensor with high sensitivity based on a multimode fiber embedded chirped long-period grating

Cited by 29 publications

References 24 publications

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Vector bending sensor based on chirped long-period grating with off-axis micro-helix taper

Switchable Multi-Wavelength Thulium-Doped Fiber Laser Using a Cascaded or Two-Segment Sagnac Loop Filter

Contact Info

Product

Resources

About