Saturable Absorption and Bistable Switching of Single Mode Fiber Core‐Guided Light by a 6 nm‐thick, Few Layers Graphene Coating on the Cladding Surface

The typical structure of an optical fiber surface plasmon resonance (SPR) sensor, which has been widely investigated, is to produce the SPR phenomenon by the transmission of light in a fiber core. The traditional method is to peel off the fiber cladding by complex methods such as corrosion, polishing, and grinding. In this paper, the transmitted light of a single-mode fiber is injected into three kinds of fiber cladding by core-shift welding technology to obtain the evanescent field directly between the cladding and the air interface and to build the Kretschmann structure by plating with a 50-nm gold film. The SPR sensing phenomenon is realized in three kinds of fiber cladding of a single-mode fiber, a graded-index multimode fiber, and a step-index multimode fiber. For the step-index multimode fiber cladding SPR sensor, all the light field energy is coupled to the cladding, leading to no light field in the fiber core, the deepest resonance valley, and the narrowest full width at half maximum. The single-mode fiber cladding SPR sensor has the highest sensitivity, and the mean sensitivity of the probe reaches 2538 nm/RIU (refractive index unit) after parameter optimization.

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Polymer Microlens on Pillar Grown From Single-Mode Fiber Core for Silicon Photonics

IEEE Photonics Technology Letters ◽

10.1109/lpt.2020.2977394 ◽

2020 ◽

Vol 32 (7) ◽

pp. 399-401

Author(s):

Osamu Mikami ◽

Ryo Sato ◽

Shuhei Suzuki ◽

Chiemi Fujikawa

Keyword(s):

Silicon Photonics ◽

Single Mode ◽

Single Mode Fiber ◽

Fiber Core

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A Stable Dual-Wavelengths Fiber Laser Equipped by an In-Fiber Integrated Michelson Interferometer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.421.122 ◽

2013 ◽

Vol 421 ◽

pp. 122-126

Author(s):

Zhong Yao Feng ◽

Ling Li ◽

Dan Su ◽

Yu Peng Wang

Keyword(s):

Fiber Laser ◽

Interference Pattern ◽

Silver Film ◽

Michelson Interferometer ◽

Single Mode ◽

Gain Medium ◽

Single Mode Fiber ◽

Fiber Core ◽

The Core ◽

Multi Mode

In this letter, an in-fiber integrated Michelson interformeteris proposed and experimentally demonstrated. The device consists in the combination of multi-mode fiber (MMF) and a single-mode fiber (SMF) tip which is covered by thick silver film. The MMF excites cladding modes into downstream SMF via the mismatch-core splicing interface. The core-cladding modes are reflected back by the silver and recoupled to fiber core through the MMF. By the reason of fiber-core mismatch and core-cladding modes interference, a well-defined interference pattern is obtained. A stable dual-wavelength fiber laser based on a hybrid gain medium combined with the interferometer filter is realized.

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Single-mode-fiber core alignment by the focusing method

10.1364/ofc.1984.tum6 ◽

1984 ◽

Author(s):

I. Kitazawa ◽

S. Nishi

Keyword(s):

Single Mode ◽

Single Mode Fiber ◽

Fiber Core

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Temperature compensation fiber-optic refractive index sensor based on single-mode fiber core-offset attenuator

10.1117/12.974803 ◽

2012 ◽

Cited By ~ 1

Author(s):

HuaQi Cheng ◽

ZhenGuo Jing ◽

Peng Wei ◽

ChuanQi Xing

Keyword(s):

Refractive Index ◽

Temperature Compensation ◽

Fiber Optic ◽

Single Mode ◽

Single Mode Fiber ◽

Refractive Index Sensor ◽

Fiber Core

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Saturated evanescent-wave absorption of few-layer graphene-covered side-polished single-mode fiber for all-optical switching

Nanophotonics ◽

10.1515/nanoph-2016-0182 ◽

2018 ◽

Vol 7 (1) ◽

pp. 207-215 ◽

Cited By ~ 10

Author(s):

Kaung-Jay Peng ◽

Chun-Lung Wu ◽

Yung-Hsiang Lin ◽

Hwai-Yung Wang ◽

Chih-Hsien Cheng ◽

...

Keyword(s):

Evanescent Wave ◽

Optical Switching ◽

Modulation Depth ◽

Single Mode ◽

Single Mode Fiber ◽

Blue Laser ◽

Saturable Absorption ◽

Layer Graphene ◽

All Optical ◽

Few Layer Graphene

AbstractUsing the evanescent-wave saturation effect of hydrogen-free low-temperature synthesized few-layer graphene covered on the cladding region of a side-polished single-mode fiber, a blue pump/infrared probe-based all-optical switch is demonstrated with specific wavelength-dependent probe modulation efficiency. Under the illumination of a blue laser diode at 405 nm, the few-layer graphene exhibits cross-gain modulation at different wavelengths covering the C- and L-bands. At a probe power of 0.5 mW, the L-band switching throughput power variant of 16 μW results in a probe modulation depth of 3.2%. Blue shifting the probe wavelength from 1580 to 1520 nm further enlarges the switching throughput power variant to 24 mW and enhances the probe modulation depth to 5%. Enlarging the probe power from 0.5 to 1 mW further enlarges the switching throughput power variant from 25 to 58 μW to promote its probe modulation depth of up to 5.8% at 1520 nm. In contrast, the probe modulation depth degrades from 5.1% to 1.2% as the pumping power reduces from 85 to 24 mW, which is attributed to the saturable absorption of the few-layer graphene-based evanescent-wave absorber. The modulation depth at wavelength of 1550 nm under a probe power of 1 mW increases from 1.2% to 5.1%, as more carriers can be excited when increasing the blue laser power from 24 to 85 mW, whereas it decreases from 5.1% to 3.3% by increasing the input probe power from 1 to 2 mW to show an easier saturated condition at longer wavelength.

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High-Sensitivity Refractive Index Sensor Based on a Cascaded Core-Offset and Macrobending Single-Mode Fiber Interferometer

Frontiers in Materials ◽

10.3389/fmats.2020.595437 ◽

2021 ◽

Vol 7 ◽

Author(s):

Chuanxin Teng ◽

Yongjie Zhu ◽

Fangda Yu ◽

Shijie Deng ◽

Libo Yuan ◽

...

Keyword(s):

Refractive Index ◽

High Sensitivity ◽

Single Mode ◽

Spectral Shift ◽

Single Mode Fiber ◽

Refractive Index Sensor ◽

Core Mode ◽

Fiber Core ◽

The Core ◽

Modal Interference

A high-sensitivity Mach–Zehnder interferometer (MZI) based on the cascaded core-offset and macrobending fiber structure is proposed for refractive index (RI) measurement. The core-offset structure makes the fiber core mode couple to the cladding modes, and some of them recouple back to the fiber core at the macrobending structure forming a model interference effect. The liquid RI can be measured by monitoring the spectral shift of the modal interference. The RI sensing performances for the interferometers with different macrobending radii and core offsets are investigated experimentally. Experimental results show that when the core offset is 2 μm and the macrobending radius is 5.5 mm, the sensitivity can reach 699.95 nm/RIU for the RI of 1.43. The temperature dependence for the proposed sensor is also tested, and a temperature sensitivity of 0.112 nm/°C is obtained.

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