Analysis of power transfer on multicore fibers with long-period gratings

Rocha, Adriana; Almeida, T.; Nogueira, Rogério N.; Facão, Margarida

doi:10.1364/ol.40.000292

Cited by 28 publications

(10 citation statements)

References 11 publications

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“…In [ 1 , 22 ] it was demonstrated that coupling between the different cladding modes is usually negligible, such that the transmission spectrum can be calculated by overlapping all the individually calculated spectra for each cladding mode. However, in those works the gratings were weak, i.e., the refractive index change was less than 1 × 10 −4 .…”

Section: Resultsmentioning

confidence: 99%

Analysis of Long Period Gratings Inscribed by CO2 Laser Irradiation and Estimation of the Refractive Index Modulation

Rocha

Machado

Almeida

et al. 2020

Sensors

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Long period gratings (LPGs) inscribed in single mode fibers (SMFs) using CO2 laser irradiation were modelled numerically using the coupled mode method. The model considers the specifications of the inscription technique, such as the shape of the refractive index modulation that mimics the circularly symmetric point-to-point laser irradiation profile. A simple expression for predicting the resonant wavelength was obtained assuming a two-mode coupling model. However, to explain the spectra of the experimental LPGs, it was necessary to assume a reasonably high refractive index change and a multimode coupling model. Furthermore, using the developed model and a genetic algorithm to fit experimental resonances to simulated ones, we were able to estimate the maximum refractive index change, obtaining a value of 2.2 × 10−3, confirming the high refractive index change. The proposed model also predicts a second order resonance for this high value of refractive index change that was confirmed experimentally. Hence, with this model, we found some significant differences in the LPGs behavior when compared with conventional ones, namely, the emergence of coupling between different cladding modes and the competition of first and second order resonances which change the LPG transmission spectrum.

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Section: Resultsmentioning

confidence: 99%

Analysis of Long Period Gratings Inscribed by CO2 Laser Irradiation and Estimation of the Refractive Index Modulation

Rocha

Machado

Almeida

et al. 2020

Sensors

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“…We assume that the LPG inscription introduces, along z, a refractive index modulation in the core. Therefore, K qp is given by [12]:…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Concerning MCFs, power transfer between the two cores of a twin core fiber was experimentally achieved with LPGs [10], [11]. Furthermore, an LPG based scheme to distribute a single pump launched in one core of an MCF to all the other ones was also demonstrated with promising results [12], [13]. However, this technique relies on splicing the MCF and a fan-in fan-out to launch light into each core.…”

Section: Introductionmentioning

confidence: 99%

Long-Period Grating Based Coupler for Multi-Core Fiber Systems

Sousa

Vieira

Facão

et al. 2021

J. Lightwave Technol.

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In this work, we propose and demonstrate numerically a long-period grating (LPG) based technique to couple light from a single-mode fiber (SMF) to all cores of a multicore fiber (MCF), i.e., an SMF to MCF coupler. The light launched into the SMF core is coupled to the SMF cladding due to the LPG inscribed in the core. Then, the optical power is transferred between fibers claddings, enhanced by the reduction of the SMF cladding radius. Finally, the MCF cladding optical power is distributed by all cores of the MCF due to identical LPGs inscribed in them. We use the coupled-mode theory to study and design the proposed device. We achieve a coupling efficiency of approximately 90% of the input power in a total length of 15.1 cm. We also study the coupler's sensitivity to the SMF radius and LPGs period. Results show that the proposed device can improve the pumping efficiency of MCF amplifiers.

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“…Considering LPGs in the MCF, the gratings in different cores can couple their individual core guided mode with the shared cladding mode. Therefore, power in one core can transfer to another core by means of the cladding mode [12].…”

Section: Inter-core Signal Switching Based On Mcf-lpgmentioning

confidence: 99%

Reconfigurable Microwave Photonic Filter Based on Long Period Gratings Inscribed in Multicore Fibers

et al. 2019

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We propose and experimentally demonstrate a reconfigurable finite impulse response microwave photonic filter (FIR-MPF) based on long period gratings (LPGs) inscribed in multicore fibers. By exploiting two dimensions of optical wavelength and space, intentional inter-core signal switching is realized. For the diversity of optical wavelength, we tune the operation wavelength to change the inter-core power coupling according to the wavelengthdependent characteristic of LPGs. On the other hand, for the diversity of space, we use directional bending of LPGs to achieve switchable spatial channel allocation. Both configurations can implement three different two-tap FIR-MPFs individually. We show a promising solution for reconfigurable radio frequency signal processing in potential with low cost and high efficiency.

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Analysis of power transfer on multicore fibers with long-period gratings

Cited by 28 publications

References 11 publications

Analysis of Long Period Gratings Inscribed by CO2 Laser Irradiation and Estimation of the Refractive Index Modulation

Analysis of Long Period Gratings Inscribed by CO2 Laser Irradiation and Estimation of the Refractive Index Modulation

Long-Period Grating Based Coupler for Multi-Core Fiber Systems

Reconfigurable Microwave Photonic Filter Based on Long Period Gratings Inscribed in Multicore Fibers

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