Thermo-optically tunable band-rejection filters using mechanically formed long-period fiber gratings

Sohn, Kyung Rak; Kim, Kwang Taek

doi:10.1364/ol.30.002688

Cited by 18 publications

(8 citation statements)

References 9 publications

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“…hundreds of nanometer). There are also some accessory spectral tuning methods reported which are mainly based on thermooptical [7][8][9], electrical [10], magnetic [11] tuning techniques using FBGs or liquid-filled photonic crystal fibers, but the bandwidth tuning range is still limited (only cover C or L band) and the process is complex (liquid injection into micro-holes). The use of tilted fiber Bragg gratings (TFBG) as band-rejection filters was initially reported by Haggans et al [12] and Kashyap et al [13] (using TFBGs with tilt angles less than 8°).…”

Section: Introductionmentioning

confidence: 99%

Wideband-adjustable reflection-suppressed rejection filters using chirped and tilted fiber gratings

Liu¹,

Guo²,

Wu³

et al. 2014

Opt. Express

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Wideband-adjustable band-rejection filters based on chirped and tilted fiber Bragg gratings (CTFBG) are proposed and experimentally demonstrated. The flexible chirp-rate and wide tilt-angle provide the gratings with broadband filtering functions over a large range of bandwidths (from 10 nm to 150 nm), together with a low insertion loss (less than 1 dB) and a negligible back-reflection (lower than -20 dB). The slope profile of CTFBG in transmission can be easily tailored by adjusting the tilt angle, grating irradiation time and chirp rate-grating factor, and it is insensitive to the polarization state of the input light, as well as to temperature, axial strain and surrounding refractive index. Furthermore, by coating the CTFBG with a suitable polymer (whose refractive index is close to that of the cladding glass), the cladding modes no longer form weakly discrete resonances and leave a smoothly varying attenuation spectrum for high-quality band-rejection filters, edge filters and gain equalizers.

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Section: Introductionmentioning

confidence: 99%

Wideband-adjustable reflection-suppressed rejection filters using chirped and tilted fiber gratings

Liu¹,

Guo²,

Wu³

et al. 2014

Opt. Express

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“…There are several different examples where outcladding overlayers [4] and bulk media [5] have been applied onto LPGs for developing sensing [6] or simple switching devices [7]. Several methods have been reported in the literature for tuning LPGs through the properties of the ambient material, including thermo-optical [8] and magneto-optical effects [9]. In the work presented herein, the spectral response of a LPG is tuned by magnetically changing the optical/mechanical properties or the spatial distribution of a magnetosensitive outcladding fluid medium, namely, a ferrofluid.…”

Section: Introductionmentioning

confidence: 99%

Optical fibre long period grating spectral actuators utilizing ferrofluids as outclading overlayers

Konstantaki¹,

Candiani²,

Pissadakis³

2011

J. Eur. Opt. Soc.-Rapid Publ.

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Results are presented on the spectral tuning of optical fibre long period gratings utilizing water and oil based ferrofluids as outclading overlayers, under static magnetic field stimulus. Two approaches are adopted for modifying the ambient refractive index at the position of the long period grating. In the first approach, a water based ferrofluid is controllably translated along the length of the grating via a magnetic field. Changes as high as 7.5 nm and 6.5 dB are monitored in the wavelength and strength, respectively, of the attenuation bands of the grating. The repeatable performance of this device for repetitive forward and backward translation verifies that no ferrofluidic residue is left on the fibre, due to silanization cladding functionalisation. In the second approach, the refractive index of an oil based ferrofluidic overlayer is modified through the magneto-optical effect. For an applied static magnetic field in the order of 400 Gauss the strength of the attenuation band of the grating is modified by more than 10% while its spectral position remains unaffected. Accordingly for the implementation of the last approach, the magnetically induced refractive index changes of ferrofluids of different solution concentrations are studied by employing diffraction efficiency measurements.

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“…A few methods have been demonstrated for obtaining tunable fiber filters that employed optical fiber gratings [1][2][3][4], combinations of different type of fibers [5], and optical fiber Fabry-Perot interferometers [6][7][8]. However, the characteristics of long-period fiber gratings are easily affected by external perturbations, such as tensile strain, pressure, and bend.…”

mentioning

confidence: 99%

“…A full-vectorial plane wave method [1] was used to calculate modal maps, i.e., effective index curves, for the modes guided in the liquid-filled PCF at temperatures of 23°C and 100°C, as shown in Fig. 5.…”

mentioning

confidence: 99%

Compact tunable multibandpass filters based on liquid-filled photonic crystal fibers

et al. 2014

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We demonstrated a compact tunable multibandpass filter with a short size of about 9 mm and a high wavelength-tuning sensitivity of up to -2.194 nm/°C by means of filling a liquid with a high refractive index of 1.700 into the air holes of a photonic crystal fiber (PCF). Such a PCF-based filter maintains an almost constant bandwidth and a large extinction ratio of more than 40 dB within the whole wavelength tuning range of more than 100 nm. Moreover, the transmission spectrum of the PCF-based filter is insensitive to the stretch force and the curvature of the fiber.

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Thermo-optically tunable band-rejection filters using mechanically formed long-period fiber gratings

Cited by 18 publications

References 9 publications

Wideband-adjustable reflection-suppressed rejection filters using chirped and tilted fiber gratings

Wideband-adjustable reflection-suppressed rejection filters using chirped and tilted fiber gratings

Optical fibre long period grating spectral actuators utilizing ferrofluids as outclading overlayers

Compact tunable multibandpass filters based on liquid-filled photonic crystal fibers

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