Comparison of Photosensitivity in Germanium Doped Silica Fibers using 244nm and 266nm Continuous-Wave Lasers

Jensen, Jørgen Birger; Varming, Poul; Liu, B.; Gries, Wolfgang

doi:10.1364/ofc.2001.wdd90

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Esta técnica emplea un elemento óptico difractivo (la máscara de fase, básicamente una red de difracción que funciona por transmisión) para modular espacialmente el haz UV de escritura. Al irradiar dicho elemento con un único haz UV (típicamente en la región espectral ~ 240-260 nm, donde el proceso de fotosensibilización en fibras ópticas es más eficiente) (Jensen et al 2001;Kashyap, 2010), la luz difractada por los dos primeros órdenes forma al interferir, un patrón de intensidad periódico y de alto contraste que fotoimprime la modulación de índice de refracción del núcleo de la fibra óptica. El contraste de esta distribución de intensidades es fuertemente dependiente de la longitud de coherencia del haz por tratarse de un fenómeno interferométrico (Prakash et al, 2006).…”

Section: Introductionunclassified

Implementación de Sistema Óptico para Grabado de Redes de Bragg en Fibra Óptica

2011

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ResumenEn este trabajo se presenta la implementación de un sistema óptico para el grabado de redes de Bragg en fibra óptica, empleando la técnica de la máscara de fase. El método consiste en irradiar una fibra fotosensible con un patrón de intensidades adecuado de luz UV que genera una modulación espacial del índice de refracción del núcleo de la fibra y forma la red de Bragg. Como fuente de iluminación se utiliza un láser pulsado de Nd-YAG cuadruplicado en frecuencia, con emisión en 266 nm. Se describe el sistema desarrollado, se analizan los resultados y se mencionan aplicaciones desarrolladas con las redes fabricadas. Palabras clave: fibra óptica, redes de Bragg en fibra, máscara de fase, láser de Nd-YAG AbstractThis work presents the implementation of an optical system for fiber Bragg grating writing by using the phase mask technique. The method consists of radiating a photosensitive optical fiber with a suitable intensity pattern of UV light that generates a spatial modulation of the fiber core refraction index and creates the Bragg grating. As light source a beam of an Nd-YAG pulsed laser, of quadrupled frequency, and 266 nm emission, was used. The proposed system is described, the results are analyzed, and applications developed with fiber Bragg grating are mentioned.

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Section: Introductionunclassified

Implementación de Sistema Óptico para Grabado de Redes de Bragg en Fibra Óptica

2011

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“…First, the grating was written in a deuterium-loaded fiber [18]. The presence of deuterium increases the photosensitivity significantly and produces much larger index modulations when the grating is written with either a UV laser [19] or a femtosecond laser around 800 nm [20]. Second, we thermally annealed the FBG, which significantly reduces the grating loss while maintaining a large index modulation [21].…”

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Slowing down light to 300 km/s in a deuterium-loaded fiber Bragg grating

et al. 2015

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We report light propagation with a group velocity of only 300 km/s, a group index of 1010, and a group delay of 42 ns, in a strong apodized fiber Bragg grating 12.5 mm in length. The grating was fabricated in a deuterium-loaded fiber using a femtosecond laser and a phase mask, followed by annealing to reduce residual losses. Data analysis indicates a strong index modulation of 1.98×10(-3) and an ultra-low single-pass power loss of 0.010 dB.

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Increasing the Refractive Index of a Germanosilicate Planar Waveguide by Irradiation with an Infrared Ultrashort Pulse Laser.

Kouta¹,

Urino²,

Hanada³

et al. 2002

The Review of Laser Engineering

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Reported here is the use of the focused beam of an infrared ultrashort pulse laser (150 femtoseconds pulse width, 200 kHz repetition rate, 800 nm wavelength, and 100 μm/s scanning speed) to increase the refractive index of a germanium-doped silica-glass planar waveguide. The increase obtained, Δn, itself increases in proportion to increases in the laser intensity of the surface irradiation, and it saturates to 1.6 ~ 1.8 × 10 -3 at 2.2 TW/cm 2 , without producing any increase in insertion loss and birefringence. Further, no decay in the refractive index change is observed after annealing at 200 ˚C for 10 hours. Results show that ultrashort pulse lasers are more suitable than UV lasers as light sources for highly stable adjustment of the optical lengths of waveguide devices.

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Comparison of Photosensitivity in Germanium Doped Silica Fibers using 244nm and 266nm Continuous-Wave Lasers

Cited by 3 publications

References 4 publications

Implementación de Sistema Óptico para Grabado de Redes de Bragg en Fibra Óptica

Implementación de Sistema Óptico para Grabado de Redes de Bragg en Fibra Óptica

Slowing down light to 300 km/s in a deuterium-loaded fiber Bragg grating

Increasing the Refractive Index of a Germanosilicate Planar Waveguide by Irradiation with an Infrared Ultrashort Pulse Laser.

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