Gain flattening fibre filters using phase-shiftedlong period fibre gratings

Qian, Jingren; Chen, H.F.

doi:10.1049/el:19980768

Cited by 98 publications

(26 citation statements)

References 7 publications

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“…Gain of the erbium doped fiber amplifier across the total spectrum in use, has emerged as topic of research in recent years. LPG'S have also been used as gain flattening filters for Erbium doped Fiber amplifiers [1], and as optical fiber polarizer's [2] because of their low insertion loss and low back reflections which in addition to gain equalization; give an overall gain enhancement as well as Amplified Spontaneous Emission (ASE) noise suppression. The development of fiber gratings had a significant impact on research and development in telecommunications and fiber optic sensing.…”

Section: Introductionmentioning

confidence: 99%

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

Sehgal¹,

Dua²

2015

International Journal of Advanced Research in Computer and Comm

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Innovations in optical fiber technology are revolutionizing world communications. As we can se that optical fiber long period grating can be used in designing of devices which are used to meet the growing demands for various ranges in the field of optical communication systems. Thus, this paper deals with the descriptive study of long period fiber grating (LPG) and its applications in emerging field of optical communication systems. LPG forms an important component of optical communication. The paper covers the analysis of long fiber grating and their fabrication. This paper also deals with the cladding mode analysis of the fiber which describes the inaccuracies of two layer model of the fiber and implementation of three layer fiber geometry to calculate the effective refractive index of the fiber so that it can effectively couple the signal for its efficient transmission. In the cladding mode analysis the whole mathematical derivation along with the requisite mathematical expressions are explained to find the effective refractive indices of the various cladding modes being supported by the fiber which are used to plot the transmission spectrum of the LPG designed for a particular frequency or wavelength used for telecommunication purposes.

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Section: Introductionmentioning

confidence: 99%

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

Sehgal¹,

Dua²

2015

International Journal of Advanced Research in Computer and Comm

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“…LPGs have also been used as gain-flattening filters for erbium-doped fiber amplifiers [2], and as optical fiber polarizer's [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Optical Fiber Long Period Grating with Reduced Temperature Sensitivity

Sharma¹,

Monga²,

Sharma³

et al. 2011

IJCEE

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Abstract-In this paper we show the experimental characterization of optical fiber long period grating for the reduced temperature sensitivity by optimizing the refractiveindex profile of the host fiber. In Long Period Fiber grating the fundamental guided mode light couple with the into copropagating cladding modes at various wavelengths. The two layer Geometry later on the three layer geometry which is useful for refractive index sensing sensing application. The sensitivity of LPFGs to environmental parameters is influenced by the period of the LPFG by the order of the cladding mode to which coupling takes place and by the composition of the optical fiber. A novel method to compensate the temperature sensitivity using a boron co-doped germanosilicate core fiber is used as a host fiber. The Theoretical Characteristic Results matches with the experimental results which demonstrate that such gratings with reduced temperature coefficient retain their capability to detect strain and ambient index variations.Index Terms-LPFG, FBG, refractive index, temperature sensitivity, cladding Mode, OSA.

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“…This is short of design flexibility for various spectral requirements. Phase-shifted LPFG is designed by introducing phase shifts in two uniform LPG, which attracted people's much attention due to its great design flexibility [6,7] . Ke H et al analyzed the transmission spectrum of double-clad phase-shifted LPFG, and optimized the spectra characteristics by adjusting the number and the location of the phase shifts [8] .…”

Section: Introductionmentioning

confidence: 99%

Filtering Characteristics of Coated Phase Shifted Long-Period Fiber Grating

Jiang-tao

Zhao

2009

2009 Symposium on Photonics and Optoelectronics

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The filtering characteristics of coated phase-shifted long-period fiber grating (LPFG) is analyzed by the coupledmode theory together with the transfer matrix method. The effects of introducing single and multiple phase shifts at various locations along a LPFG are analyzed, and the influences of the film parameters on the spectral characteristics are also studied. It is shown that the number, location and value of the phase shifts will affect the LPFG filtering characteristics. The loss peak of transmission spectrum decreases with the increase of film thickness, and the peak position shifts with the film refractive index. Compared with the non-coated phase-shifted LPFG, the coated phase-shifted LPFG not only has the similar desirable filtering characteristics, but also has a flexible adjustment ability to transmission properties.

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Gain flattening fibre filters using phase-shiftedlong period fibre gratings

Cited by 98 publications

References 7 publications

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

A Review on Optical Fiber Long Period Grating, its applications in Optical Communication System

Experimental Characterization of Optical Fiber Long Period Grating with Reduced Temperature Sensitivity

Filtering Characteristics of Coated Phase Shifted Long-Period Fiber Grating

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