Patents by Inventor Richard Michael Jenkins
Richard Michael Jenkins has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 9148225Abstract: An optical receiver for a quantum key distribution system comprises a plurality of optical components mounted or formed in a substrate and optically coupled by one or more hollow core waveguides formed in the substrate.Type: GrantFiled: January 23, 2009Date of Patent: September 29, 2015Assignee: QINETIQ LIMITEDInventors: Brian Sinclair Lowans, Richard Michael Jenkins, Ewan David Finlayson
-
Publication number: 20100290626Abstract: An optical receiver for a quantum key distribution system comprises a plurality of optical components mounted or formed in a substrate and optically coupled by one or more hollow core waveguides formed in the substrate.Type: ApplicationFiled: January 23, 2009Publication date: November 18, 2010Applicant: Qinetiq LimitedInventors: Richard Michael Jenkins, Brian Sinclair Lowans, Ewan David Finlayson
-
Patent number: 7072542Abstract: A multi-mode interference (MMI) device, comprising a hollow core multi-mode waveguide optically coupled to at least one hollow core input waveguide, is described in which the internal surfaces of the hollow core waveguides carry a reflective coating. The coating may be a low refractive index material at the wavelength of operation, such as a metal, or a multiple layer dielectric stack. Resonators and optical amplifiers using such (MMI) devices are also described.Type: GrantFiled: January 29, 2003Date of Patent: July 4, 2006Assignee: Qinetiq LimitedInventors: Richard Michael Jenkins, Mark Edward McNie
-
Patent number: 7062124Abstract: An optical filter (100) comprises a multimode waveguide (126) and first (122) and second (124) coupling waveguides which communicate with lateral sides of the multimode waveguide. The filter operates by reproducing an optical field distribution input to the multimode waveguide via one of the coupling waveguides at the position in the multimode waveguide where the other coupling waveguide communicates with the multimode waveguide. This occurs for radiation of a wavelength to be filtered but not for radiation of other wavelengths.Type: GrantFiled: October 8, 2002Date of Patent: June 13, 2006Assignee: Qinetiq LimitedInventor: Richard Michael Jenkins
-
Patent number: 7003194Abstract: An optical multiplexer and demultiplexer (mux-demux) (100) comprises a multimode waveguide (126) which communicates with first (122) and second (124) coupling waveguides. Multiplexed optical radiation comprising individual wavelength channels of appropriate wavelength introduced into the input waveguide is demultiplexed by means of modal dispersion and in-ter-modal interference with the multimode waveguide. The mux-demux consists of merely of waveguides and is therefore simple to fabricate and integrate with other components in integrated optical systems, and is capable of resolving channels having a small (˜1 nm) wavelength spacing. The mux-demux may be used without modification as a demultiplexer and remains of simple construction when scaled up to operate with many channels.Type: GrantFiled: October 8, 2002Date of Patent: February 21, 2006Assignee: Qinetiq LimitedInventor: Richard Michael Jenkins
-
Patent number: 6973240Abstract: An optical filter comprises a multimode waveguide, and first and second coupling waveguides which communicate with the multimode waveguide at respective ends thereof. Filtering is achieved by the effect of self-imaging in the multimode waveguide. The filter further comprises one or more series of aperture within the multimode waveguide, the or each series being located at a longitudinal position within the multimode waveguide at which 1-to-N way intensity division of an input optical field occurs, the optical field being the lowest order transverse mode of the coupling waveguides. The (one or more) series of apertures reduces the transmission of the filter at wavelength other than those corresponding to transmission peaks of filter's transmission function, thus providing improved filtering performance compared to prior art optical filters based on self-imaging.Type: GrantFiled: October 8, 2002Date of Patent: December 6, 2005Assignee: Qinetiq LimitedInventor: Richard Michael Jenkins
-
Publication number: 20040252934Abstract: An optical filter (100) comprises a multimode waveguide (126) and first (122) and second (124) coupling waveguides which communicate with lateral sides of the multimode waveguide. The filter operates by reproducing an optical field distribution input to the multimode waveguide via one of the coupling waveguides at the position in the multimode waveguide where the other coupling waveguide communicates with the multimode waveguide. This occurs for radiation of a wavelength to be filtered but not for radiation of other wavelengths.Type: ApplicationFiled: April 15, 2004Publication date: December 16, 2004Inventor: Richard Michael Jenkins
-
Publication number: 20040247235Abstract: An optical multiplexer and demultiplexer (mux-demux) (100) comprises a multimode waveguide (126) which communicates with first 9122) and second (124) coupling waveguides. Multiplexed optical radiation comprising individual wavelength channels of appropriate wavelength introduced into the input waveguide is demultiplexed by means of modal dispersion and in-ter-modal interference with the multimode waveguide. The mux-demux consists of merely of waveguides and is therefore simple to fabricate and integrate with other components in integrated optical systems, and is capable of resolving channels having a small (˜1 nm) wavelength spacing. The mux-demux may be used without modification as a demultiplexer and remains of simple construction when scaled up to operate with many channels.Type: ApplicationFiled: March 31, 2004Publication date: December 9, 2004Inventor: Richard Michael Jenkins
-
Publication number: 20040240775Abstract: An optical filter comprises a multimode waveguide, and first and second coupling waveguides which communicate with the multimode waveguide at respective ends thereof. Filtering is achieved by the effect of self-imaging in the multimode waveguide. The filter further comprises one or more series of aperture within the multimode waveguide, the or each series being located at a longitudinal position within the multimode waveguide at which 1-to-N way intensity division of an input optical field occurs, the optical field being the lowest order transverse mode of the coupling waveguides. The (one or more) series of apertures reduces the transmission of the filter at wavelength other than those corresponding to transmission peaks of filter's transmission function, thus providing improved filtering performance compared to prior art optical filters based on self-imaging.Type: ApplicationFiled: April 15, 2004Publication date: December 2, 2004Inventor: Richard Michael Jenkins
-
Patent number: 5917596Abstract: A radiation field analyzer (10) provides means for analyzing the spatial mode spectrum of radiation received from a scene. In a multimode waveguide embodiment, light from a laser (24) is directed towards a scene through an alumina waveguide structure (12). A portion of the laser light is directed towards a mode generator (28) which selectively converts the laser radiation into one of a series of modes. Laser light returning from the scene is mixed with the light from the mode generator to produce interference signals. These signals are measured by a detector (34) and analyzed by a programmed computer (36). By sequentially altering the mode generated by the generator (28) and analyzing the resulting signals, a spectrum of the modes returning from the scene is obtained.Type: GrantFiled: November 12, 1997Date of Patent: June 29, 1999Assignee: The Secretary of State for Defence in Her Brittanic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Richard Michael Jenkins, Robert W. J. Devereux