摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
Fiber light amplifiers adapted for high power application are provided. In embodiments of the invention, the light signal to be amplified is coupled to a cladding mode of an active waveguide region which is cladding doped. The amplified light is coupled to an output fiber have waveguiding properties matching those of the active cladding of the active waveguide region. In other embodiments, two or more amplifying stages are provided coupled by a wavelength selective loss element which couples the Stokes wave co-propagating with the signal to be amplified out of the signal guiding mode prior to the onset of SRS.
摘要:
An optical waveguide sensing method and device in which a waveguide layer receives an optical signal and propagates the optical signal in accordance with a predetermined optical waveguide propagation mode. A testing medium surface in communication with the waveguide layer is responsive to a testing medium for modifying at least one characteristic of the propagated optical signal in relation to a given parameter of the testing medium. In this manner, the modified characteristic of the propagated optical signal can be measured in view of determining the given parameter of the testing medium.
摘要:
In a first broad aspect, the invention provides a light source. The light source includes a semiconductor laser for emitting laser light at a first frequency. The light source also includes an optical fibre that includes a fibre Bragg grating. The fibre Bragg grating is optically coupled to the semiconductor laser for receiving the laser light, reflecting a reflected portion of the laser light towards the laser and allowing the transmitted portion of the laser light to pass through the fibre Bragg grating. The fibre Bragg grating has a temperature-dependant reflection spectrum. A frequency converting optical element is optically coupled to the fibre Bragg grating for receiving the transmitted portion of the laser light and converting at least a fraction of the transmitted portion of the laser light into a converted light having a second frequency different from the first frequency. An output port is optically coupled to the frequency converting optical element for outputting the converted light. A temperature controller is thermally coupled to the fibre Bragg grating for modulating a temperature of the fibre Bragg grating so as to modulate the reflection spectrum.
摘要:
In a first broad aspect, the invention provides a light source. The light source includes a semiconductor laser for emitting laser light at a first frequency. The light source also includes an optical fibre that includes a fibre Bragg grating. The fibre Bragg grating is optically coupled to the semiconductor laser for receiving the laser light, reflecting a reflected portion of the laser light towards the laser and allowing the transmitted portion of the laser light to pass through the fibre Bragg grating. The fibre Bragg grating has a temperature-dependant reflection spectrum. A frequency converting optical element is optically coupled to the fibre Bragg grating for receiving the transmitted portion of the laser light and converting at least a fraction of the transmitted portion of the laser light into a converted light having a second frequency different from the first frequency. An output port is optically coupled to the frequency converting optical element for outputting the converted light. A temperature controller is thermally coupled to the fibre Bragg grating for modulating a temperature of the fibre Bragg grating so as to modulate the reflection spectrum.