Sensitivity Analysis of Phase Matched Turning Point Long Period Fiber Gratings

Gambhir, Monika; Gupta, Shilpi

doi:10.1007/978-3-319-73712-6_26

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…They are intrinsically sensitive to external perturbations, enabling the measurement of several parameters [ 7 ]. The fabrication of an LPFG with high sensitivity to the external perturbations is possible by selecting a cladding mode and period at, or very close to, the turning around point (TAP) [ 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Stability and Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Direct Writing

Viveiros

Almeida

Coelho

et al. 2020

Sensors

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Long period fiber gratings (LPFGs) were fabricated in a standard single mode fiber (SMF-28e) through femtosecond (fs) laser direct writing. LPFGs with longer and shorter periods were fabricated, which allows coupling from the fundamental core mode to lower and higher order asymmetric cladding modes (LP1,6 and LP1,12, respectively). For the grating periods of 182.7 and 192.5 µm, it was verified that the LP1,12 mode exhibits a TAP at approximately 1380 and 1448 nm in air and water, respectively. Characterization of the LPFGs subjected to high-temperature thermal treatment was accomplished. Fine-tuning of the resonance band’s position and thermal stability up to 600 °C was shown. The temperature sensitivity was characterized for the gratings with different periods and for different temperature ranges. A maximum sensitivity of −180.73, and 179.29 pm/°C was obtained for the two resonances of the 182.7 µm TAP LPFG, in the range between 250 and 600 °C.

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Section: Introductionmentioning

confidence: 99%

Temperature Stability and Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Direct Writing

Viveiros

Almeida

Coelho

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

EDFA gain flattening optimization with long period fiber gratings in WDM system

Gandhi

Gupta

Gambhir³

2021

Journal of Optical Communications

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This paper highlights a proposed optimized gain flatness technique for nonuniform gain spectrum of the erbium-doped fiber amplifier (EDFA) by introduction of long period fiber gratings (LPFG). In this analysis, EDFA gain spectrum has been evaluated between 1525 and 1600 nm with −20 dBm input signal power. Attenuation peaks of LPFG are optimized with a grating period of 240 µm and grating length of 30000 µm in the wavelength range of 1.1–1.8 μm, to compensate the peak gain of EDFA. Results have shown that EDFA peak gain of 35.94 dB is achieved at 1532.89 nm wavelength. This 35.94 dB peak gain is flattened up to 2.65 dB using long period fiber gratings. Also, less than ±0.3 dB gain flatness is achieved between 1528 and 1560 nm wavelength. The proposed less complex technique can be used to modify the grating parameters during fabrication in order to produce the loss peak at desired wavelength, which is efficient to flatten EDFA gain peak.

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Sensitivity Analysis of Phase Matched Turning Point Long Period Fiber Gratings

Cited by 2 publications

References 10 publications

Temperature Stability and Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Direct Writing

Temperature Stability and Spectral Tuning of Long Period Fiber Gratings Fabricated by Femtosecond Laser Direct Writing

EDFA gain flattening optimization with long period fiber gratings in WDM system

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