Fabrication of long period fiber gratings with CO<sub>2</sub> laser fusion splicers

Zheng, Wenxin

doi:10.1109/ogc.2016.7590487

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…In the transmission spectrum of the LPFG, between the resonant wavelengths R1 and R2 , there are low-amplitude side lobes which modify the net gain of the cavity, and we observe that the laser emissions might correspond to these side lobes in the grating transmission. This effect might be produced by the insertion loss due to the accumulated MFD along the LPFG [62]. The shift of the LPFG transmission toward longer wavelengths is produced by the increment the temperature induces on the effective index difference and is observed along all the temperature experiments.…”

Section: Switchable State Under Temperature Parametermentioning

confidence: 83%

“…The length of the LPFG is = Λ, where is the number of tapers and Λ is the period of the perturbation [60]. Furthermore, due to the thermal expansion of the core, the mode field diameter (MFD) is also locally expanded at each taper location [62]. The germanium in the core is diffused toward the cladding [63] increasing the MFD as is shown in [64], in which were observed two bright points of irradiation on an axial cut-off in the middle of the thermally-expanded core, similar to LP11 mode.…”

Section: Lpfg Fabrication and Operation Principlementioning

confidence: 99%

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Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

et al. 2021

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In this study, a switchable ytterbium-doped fiber laser based on symmetrical long-period fiber grating (LPFG) is presented. The LPFG is used as a wavelength-selective filter (WSF). Utilizing this WSF, the laser can emit one, two, or multiple stable output beams by adjusting the temperature on the LPFG from 20 °C to 600 °C. In addition, switching is also possible by adjusting the curvature of the LPFG from 0.399 to 0.709 m -1 . The symmetrical LPFG was fabricated by combining the cladding shaping with the thermal core expansion techniques by using a CO2-laser LZM-100 glass-processing system. The experimental results show a side-mode suppression ratio (SMSR) of 49 dB and a linewidth of 0.06 nm, within the range from 1038 to 1080 nm. In conclusion, the main achievement of this switchable laser is the high SMSR and stable output for high values of temperature, using a repeatable, simple, easy construction, and cost-effective laser tuning technique.

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Section: Switchable State Under Temperature Parametermentioning

confidence: 83%

Section: Lpfg Fabrication and Operation Principlementioning

confidence: 99%

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

et al. 2021

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“…With this size of the laser spot, the fiber can be heated without introducing extra damage, such as an etching effect. The inventors of the LZM-100 have proposed a method to manufacture a periodically-tapered LPFG [ 15 ]. With the advantages of the device, Masri proposed a new kind of LPFG that has a strong asymmetric structure [ 16 ], and it can be used as a mode-selective device.…”

Section: Methodsmentioning

confidence: 99%

Manufacturing a Long-Period Grating with Periodic Thermal Diffusion Technology on High-NA Fiber and Its Application as a High-Temperature Sensor

Shen¹,

Dai²,

Xing³

et al. 2018

Sensors

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We demonstrated a kind of long-period fiber grating (LPFG), which is manufactured with a thermal diffusion treatment. The LPFG was inscribed on an ultrahigh-numerical-aperture (UHNA) fiber, highly doped with Ge and P, which was able to easily diffuse at high temperatures within a few seconds. We analyzed how the elements diffused at a high temperature over 1300 °C in the UHNA fiber. Then we developed a periodically heated technology with a CO2 laser, which was able to cause the diffusion of the elements to constitute the modulations of an LPFG. With this technology, there is little damage to the outer structure of the fiber, which is different from the traditional LPFG, as it is periodically tapered. Since the LPFG itself was manufactured under high temperature, it can withstand higher temperatures than traditional LPFGs. Furthermore, the LPFG presents a higher sensitivity to high temperature due to the large amount of Ge doping, which is approximately 100 pm/°C. In addition, the LPFG shows insensitivity to the changing of the environment’s refractive index and strain.

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High-sensitivity bending vector sensor based on γ-shaped long-period fiber grating

Lai

Zhang

et al. 2021

Optics & Laser Technology

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Fabrication of long period fiber gratings with CO₂ laser fusion splicers

Cited by 5 publications

References 10 publications

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

Manufacturing a Long-Period Grating with Periodic Thermal Diffusion Technology on High-NA Fiber and Its Application as a High-Temperature Sensor

High-sensitivity bending vector sensor based on γ-shaped long-period fiber grating

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Fabrication of long period fiber gratings with CO2 laser fusion splicers

Cited by 5 publications

References 10 publications

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

Switchable Ytterbium Fiber Laser Based on a Symmetrical Long-Period Fiber Grating

Manufacturing a Long-Period Grating with Periodic Thermal Diffusion Technology on High-NA Fiber and Its Application as a High-Temperature Sensor

High-sensitivity bending vector sensor based on γ-shaped long-period fiber grating

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Product

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About

Fabrication of long period fiber gratings with CO₂ laser fusion splicers