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.
Abstract translation:含硼玻璃对225-275nm波段的辐射敏感,因此,B 2 O 3玻璃特别适于接收折射率调制,例如制造反射光栅。 当光栅定位在纤维的包层中时,含有SiO 2和B 2 O 3的玻璃特别适合。 当光栅位于波导的路径区域中时,例如在纤维的芯中,含有SiO 2,GeO 2和B 2 O 3的玻璃是合适的。
Abstract:
It has been demonstrated that B 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 fiber. 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 fiber.
Abstract translation:PCT No.PCT / GB93 / 01321 Sec。 371日期1994年9月22日 102(e)日期1994年9月22日PCT提交1993年6月24日PCT公布。 公开号WO94 / 00784 日期1994年1月6日已经证明含B的玻璃对225-275nm波段的辐射敏感,因此B 2 O 3玻璃特别适于接收折射率调制,例如制造反射光栅。 当光栅定位在纤维的包层中时,含有SiO 2和B 2 O 3的玻璃特别适合。 当光栅位于波导的路径区域中时,例如在纤维的芯中,含有SiO 2,GeO 2和B 2 O 3的玻璃是合适的。
Abstract:
An optical fibre is fixed against a first face of a prism. A coherent beam of optical radiation is directed at the prism such that a portion B propagates directly to the first face while a second portion propagates via total internal reflection at a second face. The interference of the two portions creates a refractive index grating in the fibre at a wavelength longer than that of the radiation. The method provides a stable and simple method of sidewriting of waveguide gratings.
Abstract:
It has been demonstrated that B containing glasses are sensitive to radiation in the band 225-275 nm and, therefore, B2O3 glasses are particularly adapted to receive refractive index modulation, e.g., to make reflection gratings. Glasses containing SiO2 and B2O3 are particularly suitable when the grating is to be localized in the cladding of a fiber. Glasses containing SiO2, GeO2, and B2O3 are suitable when the grating is in the path region of a waveguide, e.g., in the core of a fiber.
Abstract translation:已经证明含B玻璃对225-275nm波段的辐射敏感,因此B 2 O 3玻璃特别适于接收折射率调制,例如制造反射光栅。 当光栅定位在纤维的包层中时,含有SiO 2和B 2 O 3的玻璃特别适合。 当光栅位于波导的路径区域中时,例如在纤维的芯中,含有SiO 2,GeO 2和B 2 O 3的玻璃是合适的。
Abstract:
A filter has a preselected attenuation/wavelength characteristic, in which spatially separated parts of the filter attenuate different wavelengths. The spatially-separated parts have different attenuation characteristics to attenuate different wavelengths in a predetermined manner to provide a selected attenuation/wavelength characteristic. In one arrangement an interference type filter includes a grating, the pitch of which varies spatially. In one instance, the structure to determine the proportion of radiation subject to interference includes a grating of spatially-varying effectiveness, but alternatively it may include an attenuation filter, the attenuation effect of the attenuation layer varying spatially. In another arrangement, the filter may include structure to separate received radiation into a spatially-disposed spectrum, and to attenuate different parts of the spatially-disposed spectrum in such a manner as to provide the selected attenuation/wavelength characteristic.
Abstract:
A section of tapered optical fiber is provided to protect optical components from catastrophic damage that may propagate within an optical route. The tapered section functions as a fuse to arrest the propagation of optical power induced damage by leaking optical power from a waveguiding region below a threshold, below which further propagation of damage is not supported.
Abstract:
An athermalized optical fiber component assembly including a limiting member, a mounting structure attached to the limiting member, a temperature compensating substrate attached to the mounting structure, and an optical fiber component mounted on the temperature compensating substrate. The movement of the temperature compensating substrate as a function of temperature is constrained by the limiting member. Also, a method for manufacturing an athermalized optical fiber component assembly.
Abstract:
A multiple band pass optical filter comprises an interferometer, such as a Michelson interferometer, with de-tuned reflective Bragg gratings 8, 9 that produce multiple, separate, substantially equal reflectivity pass bands for light passing from the interferometer's input port P1 to output port P2.
Abstract:
An optical fibre is formed with longitudinal recesses (11, 12) which extend toward its core (3) through cladding region (2). The recesses receive electrode structures (20a, b) made of glass, which include tongues (23a, b) that fit into the recesses, on which metal electrode strips (a, b) are formed. A potential difference applied between the strips (a, b) can induce electro-optic effects in the core.
Abstract:
An optical fibre is fixed between a clamp and a piezo-electric translation stage. An argon ion laser emitting at 514.5 nm is used to write Bragg gratings in the fibre. A different longitudinal stress is applied to the fibre before optically writing each Bragg grating. The fibre when unstressed will have a Bragg grating of different peak reflectivity corresponding to the number of different applied stresses.