Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1999-12-21
2000-08-01
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 34, 359577, 359900, 385 37, G02B 634, G02B 2700, G03H 102, G03H 100
Patent
active
060975121
ABSTRACT:
Boron containing glasses are sensitive to radiation in the band 225-275 nm and therefore, B.sub.2 O.sub.3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO.sub.2 and B.sub.2 O.sub.3 are particularly suitable when the grating is to be localized in the cladding of a fibre. Glasses containing SiO.sub.2, GeO.sub.2 and B.sub.2 O.sub.3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fibre.
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Williams et al, "Enhanced UV Photosensitivity in Boron Codoped Germanosilicate Fibres", Electronics Letters, vol. 29, No. 1, Jan. 7, 1993, pp. 45-47.
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Electronics Letters, vol. 27, No. 21, Oct. 10, 1991, Stevenage, Herts., GB, pp. 1945-1947, Formation of Moire Grating in Core of Germanosilicate Fibre by Transverse Holographic Double Exposure Method:.
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Ainslie Benjamin J
Armitage Jonathan R
Kashyap Raman
Maxwell Graeme D
Williams Douglas L
British Telecommunications public limited company
Jr. John Juba
Spyrou Cassandra
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