Tunable optical fiber cascade filter by magneto-optical effect

Abstract Optical filters based on cascade single mode - multimode - single mode fiber structure (SMS) has considerable attention as a reliable optical device the reliability is due to its simplicity, compactness, low cost, all fiber device, low transmission loss, and can be continuously tune the laser wavelength at a specific spectral range. The principle of the operation is based on self- image and multimode interference (MMI) phenomena. A tunable filter was simulated based on cascade single mode-no core-single mode (SNS) fiber structure surrounded by magneto-optical fluid (MOF) using finite element method (FEM), the influence of the no core fiber (NCF) diameter and length on the tunablility and the bandwidth is investigated and optimized. Two materials were adopted as a MOF. The results show that the tunability of the filter can be improved by decreasing the NCF diameter. A continuous wavelength tunability about 37 nm from 1518 to 1555 nm with a bandwidth about 10 nm is obtained. The device is highly stable, inexpensive, provide wide tuning range compared with other tuning methods. This device can be used in optical communication, fiber sensor, spectroscopy, and in fiber laser technology. To the best of our knowledge, this is the first optical fiber MMI tunable filter by magnetic field effect.

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Optical fiber temperature sensor based on a Mach-Zehnder interferometer with single-mode-thin-core-single-mode fiber structure

Review of Scientific Instruments ◽

10.1063/1.5128485 ◽

2020 ◽

Vol 91 (1) ◽

pp. 015006 ◽

Cited By ~ 3

Author(s):

Qingzhuo Wang ◽

Hongyun Meng ◽

Xiaofeng Fan ◽

Mengqi Zhou ◽

Fengxiang Liu ◽

...

Keyword(s):

Optical Fiber ◽

Temperature Sensor ◽

Single Mode ◽

Single Mode Fiber ◽

Zehnder Interferometer ◽

Fiber Structure ◽

Mach Zehnder Interferometer

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Erbium Ring Fiber Laser Cavity Based on Tip Modal Interferometer and Its Tunable Multi-Wavelength Response for Refractive Index and Temperature

Applied Sciences ◽

10.3390/app8081337 ◽

2018 ◽

Vol 8 (8) ◽

pp. 1337 ◽

Cited By ~ 1

Author(s):

Yanelis Lopez-Dieguez ◽

Julian Estudillo-Ayala ◽

Daniel Jauregui-Vazquez ◽

Luis Herrera-Piad ◽

Juan Sierra-Hernandez ◽

...

Keyword(s):

Refractive Index ◽

Fiber Laser ◽

Low Cost ◽

Ring Cavity ◽

Laser Cavity ◽

Single Mode ◽

Cost Effective ◽

Single Mode Fiber ◽

Fiber Structure ◽

Multi Wavelength

A tunable multi-wavelength fiber laser is proposed and demonstrated based on two main elements: an erbium-doped fiber ring cavity and compact intermodal fiber structure. The modal fiber interferometer is fabricated using the cost-effective arc splice technique between conventional single-mode fiber and microfiber. This optical fiber structure acts as a wavelength filter, operated in reflection mode. When the refractive index and temperature variations are applied over the fiber filter, the ring laser cavity provides several quad-wavelength laser spectra. The multi-wavelength spectra are tuned into the C-band with a resolution of 0.05 nm. In addition, the spectra are symmetric with minimal power difference between the lasing modes involved, and the average of the side mode suppression ratio is close to 37 dB. This laser offers low-cost implementation, low wavelength drift, and high power stability, as well as an effect of easy controllability regarding tuned multi-wavelength.

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Switchable and tunable linear cavity erbium-doped fiber laser based on FBGs embedded in Sagnac rings

Laser Physics ◽

10.1088/1555-6611/ac3512 ◽

2021 ◽

Vol 32 (1) ◽

pp. 015101

Author(s):

Gangxiao Yan ◽

Weihua Zhang ◽

Peng Li ◽

Qiuhao Jiang ◽

Meng Wu ◽

...

Keyword(s):

Fiber Laser ◽

Low Cost ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Hole Burning ◽

Linear Cavity ◽

Erbium Doped ◽

Optical Fiber Sensing ◽

Birefringence Effect

Abstract A switchable and tunable erbium-doped fiber laser with a linear cavity based on fiber Bragg gratings embedded in Sagnac rings is proposed and experimentally verified. Due to the stress birefringence effect and the polarized hole burning effect, which are introduced into the single-mode fiber in the polarization controllers (PCs) by the PCs, the designed laser can achieve seven kinds of laser-states output including three kinds of single-wavelength laser states, three kinds of dual-wavelength laser states and one kind of triple-wavelength laser state. The optical signal-to-noise ratios of the output wavelengths are all higher than 52 dB, and the wavelength shifts are all less than 0.04 nm. Furthermore, the temperature tuning of the wavelength range is also researched, which is about 1.2 nm. Due to advantages, such as low cost, simple structure, easy switching and multiple laser states, the designed laser has great application potential in laser radar, optical fiber sensing and so on.

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Performance comparison of high temperature sensor based on non‐adiabatic silica microfiber and single mode‐multimode‐single mode fiber structure

Microwave and Optical Technology Letters ◽

10.1002/mop.31595 ◽

2018 ◽

Vol 61 (2) ◽

pp. 431-435 ◽

Cited By ~ 2

Author(s):

Nur Hotimah Yusof ◽

Hashim A. Razak ◽

Hamzah Arof ◽

Sulaiman W. Harun

Keyword(s):

High Temperature ◽

Temperature Sensor ◽

Single Mode ◽

Single Mode Fiber ◽

Performance Comparison ◽

Fiber Structure ◽

High Temperature Sensor

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Microdrilled tapers to enhance optical fiber lasers for sensing

Scientific Reports ◽

10.1038/s41598-021-00046-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

R. A. Perez-Herrera ◽

M. Bravo ◽

P. Roldan-Varona ◽

D. Leandro ◽

L. Rodriguez-Cobo ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Fiber Lasers ◽

Signal To Noise Ratio ◽

Power Level ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Output Power Level ◽

Linear Cavity

AbstractIn this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled backscattering fiber reflectors are used in short linear cavity fiber lasers. In particular, laser emission and sensor application features are analyzed when employing optical tapered fibers, micro-drilled optical fibers and 50 μm-waist or 100 μm-waist micro-drilled tapered fibers (MDTF). Single-wavelength laser with an output power level of about 8.2 dBm and an optical signal-to-noise ratio of 45 dB were measured when employing a 50 μm-waist micro-drilled tapered optical fiber. The achieved temperature sensitivities were similar to those of FBGs; however, the strain sensitivity improved more than one order of magnitude in comparison with FBG sensors, attaining slope sensitivities as good as 18.1 pm/με when using a 50 μm-waist MDTF as distributed reflector.

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