Ultrathin Lensed Photonic Crystal Fibers with Wide Bandwidth and Long Working Distances

Chen, Yuxing; Wang, Caoyuan; Xiao, Limin

doi:10.1109/jlt.2021.3050726

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…However, optical sensing and optical imaging require optical fibers to have the ability to regulate light with the development of optical fiber technology, and the most optical fibers are difficult to meet present requirement of optical sensing and optical imaging. To solve this problem, photonic crystal fibers [7][8][9] and lens fibers [10][11][12] are developed, photonic crystal fiber can achieve different light regulation by changing different lattice parameters, and lens fiber can regulate light output and imaging by manufacturing optical lens on the end face of optical fiber. Although photonic crystal fiber and lens fiber have excellent light regulation ability, which have the disadvantages of complex fabrication, high cost and high requirements for equipment.…”

Section: Introductionmentioning

confidence: 99%

Research on the optical properties of an easy-to-prepare beveled fiber

Huang

Liu

2023

14th International Photonics and Optoelectronics Meetings (POEM 2022)

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Optical fiber has become a very important optical transmission medium due to its excellent anti-interference ability, longdistance transmission and low loss characteristics, which is widely used in signal transmission, remote sensing, optical imaging fields. In order to obtain the specific image spot shape and size, the research of optical output and imaging performance of fiber is gradually increasing. At present, common optical fibers have weak imaging regulation ability, most of the optical fiber imaging probes mainly use light regulation ability of photonic crystal fiber or add microlens on the fiber end face to realize the regulation of light output and imaging ability, which used to light collimate, light focus and control the wavelength of light. However, photonic crystal fibers have the disadvantages of difficult preparation, high equipment requirements and high cost, the method of adding microlens on the fiber end face will cause the probe to be oversize. Here, we propose a simple-fast and cost-effective preparation method for beveled fiber, which can be prepared by beveling and grinding simply. The beveled angle of fiber is closely related to the incident angle and exit angle of the light, different bevel angles will have a huge impact on the propagation path of light and lead to different degrees of total internal reflection of light on the end face of fiber, which will ultimately affect the shape of image spot. The imaging performance of fiber is simulated and analyzed by Zemax software, results show that the shape of image can be control by changing the beveled angle of fiber end face. The experiments show that the actual effect of beveled fiber is consistent with the simulation results, specific imaging requirements can be met by optimizing beveled angle, which is expected to be combined with optical elements to build a compact optical path.

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Section: Introductionmentioning

confidence: 99%

Research on the optical properties of an easy-to-prepare beveled fiber

Huang

Liu

2023

14th International Photonics and Optoelectronics Meetings (POEM 2022)

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“…Exerting periodical mechanical stress on a few-mode fiber could induce coupling between two copropagating core-guided modes, but such LPFGs could persist when mechanical stress was released [ 20 ]. A periodic taped structure induced by an electrical arc or structuring a fiber with a CO 2 laser could also realize the fabrication of LPFGs [ 21 , 22 , 23 , 24 ], but these LPFGs were relatively fragile because a few sections of the fiber became thinner just like microfibers [ 25 , 26 , 27 ]. UV lasers could inscribe relatively stable LPFGs by the direct-writing method or with the help of amplitude masks, but sufficient photosensitivity of fibers is necessary, so fibers should usually be hydrogen loaded in advance [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Spectral Characteristics of Square-Wave-Modulated Type II Long-Period Fiber Gratings Inscribed by a Femtosecond Laser

Zhao

Rao

et al. 2021

Sensors

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We study here the spectral characteristics of square-wave-modulated type II long-period fiber gratings (LPFGs) inscribed by a femtosecond laser. Both theoretical and experimental results indicate that higher-order harmonics refractive index (RI) modulation commonly exists together with the fundamental harmonic RI modulation in such LPFGs, and the duty cycle of a square wave has a great influence on the number and amplitudes of higher-order harmonics. A linear increase in the duty cycle in a series of square wave pulses will induce another LPFG with a minor difference in periods, which is useful for expanding the bandwidth of LPFGs. We also propose a method to reduce insertion loss by fabricating type II LPFGs without higher-order harmonic resonances. This work intensifies our comprehension of type II fiber gratings with which novel optical fiber sensors can be fabricated.

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Simple and Adjustable LP₀₁–LP₁₁–OAM Mode Conversion Method in One Single-Mode Fiber With Half-Dome Lens

Zhang,

Jiang,

et al. 2024

IEEE Sensors J.

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Ultrathin Lensed Photonic Crystal Fibers with Wide Bandwidth and Long Working Distances

Cited by 8 publications

References 36 publications

Research on the optical properties of an easy-to-prepare beveled fiber

Research on the optical properties of an easy-to-prepare beveled fiber

Spectral Characteristics of Square-Wave-Modulated Type II Long-Period Fiber Gratings Inscribed by a Femtosecond Laser

Simple and Adjustable LP₀₁–LP₁₁–OAM Mode Conversion Method in One Single-Mode Fiber With Half-Dome Lens

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