# US 11,307,362 B2 · Optical ferrules with waveguide inaccessible space > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,307,362 B2 - Document ID: US11307362B2 - Status: Granted - Kind: B2 - Application number: 15/763,526 - Filed: 2016-10-03 - Published: 2019-02-14 - Granted: 2022-04-19 - Earliest claimed: 2015-10-12 - Assignees: 3M Innovative Properties Company - Applicants: 3M Innovative Properties Company - Inventors: Michael A. Haase; Terry L. Smith; Bing Hao; Changbao Ma - Web page: https://patentgrep.com/patent/US11307362B2 ## CPC - G02B 6/3861: {Adhesive bonding (adhesives in general C09J)} - G02B 6/382: {with index-matching medium between light guides (provisionally see G02B6/4212)} - G02B 6/3839: {for a plurality of light guides} - G02B 6/3853: {Lens inside the ferrule (lensed connectors G02B6/32)} - G02B 6/3885: {Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type (optical ribbon cable G02B6/4403, G02B6/448)} - G02B 6/3652: {the additional structures being prepositioning mounting areas, allowing only movement in one dimension, e.g. grooves, trenches or vias in the microbench surface, i.e. self aligning supporting carriers} - G02B 6/3838: {using grooves for light guides} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical ferrule includes at least one light affecting element configured to affect one or more characteristics of light from an optical waveguide as the light propagates in the optical ferrule, the light affecting element having an input surface. At least one receiving element receives and secures the optical waveguide to the ferrule so that an output surface of the waveguide is optically coupled to the input surface of the light affecting element. A waveguide stop limits movement of the waveguide toward the input surface of the light affecting element when the optical waveguide is installed in the receiving element. A space between the output surface of the optical waveguide and the input surface of the light affecting element is inaccessible to the optical waveguide when the optical waveguide is installed in the receiving element. ## Claims ### Claim 1 An optical ferrule comprising: at least one light affecting element configured to affect one or more characteristics of light from an optical waveguide as the light propagates in the optical ferrule, the light affecting element having an input surface; at least one receiving element configured to receive and secure the optical waveguide so that an output surface of the waveguide is optically coupled to the input surface of the light affecting element; a waveguide stop configured to be disposed between the output surface of the waveguide and the input surface the light affecting element and limit movement of the waveguide toward the input surface of the light affecting element when the optical waveguide is installed in the receiving element; and a space between the output surface of the optical waveguide and the input surface of the light affecting element that is inaccessible to the optical waveguide when the optical waveguide is installed in the receiving element, wherein the at least one receiving element comprises a Y shaped groove defined by a first region, a second region, an opening, and an a bottom surface, the first region defined between the bottom surface and the second region, the first region comprising opposing outwardly sloping sidewalls being within about 10 degrees of normal to the bottom surface, the second region disposed between the first region and the opening and comprising sidewalls that extend outwardly from a central plane of the Y shaped groove, the Y shaped groove extending along a longitudinal axis between an entrance of the Y shaped groove and a terminal end of the Y shaped groove, the Y shaped groove comprising a longitudinal transition section adjacent the terminal end and an extended section disposed between the entrance and the longitudinal transition section, a spacing between the opposing sidewalls in the extended section being greater than a diameter of the optical waveguide, the transition section comprising centering sidewalls configured to center the optical waveguide within the Y shaped groove. ### Claim 2 (depends on 1) The optical ferrule of claim 1, wherein the waveguide stop comprises a position at which a width between the centering sidewalls is less than a diameter of the waveguide, and wherein the width between the centering sidewalls becomes progressively narrower along the longitudinal axis of the groove in a direction toward the input surface. ### Claim 3 (depends on 1) The optical ferrule of claim 1, wherein the light affecting element comprises a lens, or an element configured to redirect light from the optical waveguide. ### Claim 4 (depends on 1) The optical ferrule of claim 1, wherein the waveguide inaccessible space is configured to allow light to propagate unimpeded between an output surface of the waveguide and the input surface of the light affecting element. ### Claim 5 (depends on 1) The optical ferrule of claim 1, wherein the waveguide inaccessible space comprises an adhesive reservoir. ### Claim 6 (depends on 1) The optical ferrule of claim 1, wherein the waveguide inaccessible space is configured to contain a compliant material, and wherein the compliant material is one or more of an optical adhesive, optical gel, and optical oil. ### Claim 7 (depends on 1) The optical ferrule of claim 1, wherein a distance between the output surface of the waveguide and the input surface of the light affecting element is greater than about 10 μm. ### Claim 8 (depends on 1) The optical ferrule of claim 1, wherein the waveguide stop is positioned such that a distance between the waveguide stop and the input surface of the light affecting element is greater than about 10 μm. ### Claim 9 An optical ferrule comprising: at least one groove configured to receive and secure an optical waveguide; at least one light affecting element configured to affect one or more characteristics of light from the optical waveguide as the light propagates in the optical ferrule, the light affecting element having an input surface proximate the groove; a waveguide stop disposed in the groove proximate to the input surface of the light affecting element, the waveguide stop configured to restrict motion of the optical waveguide toward the input surface; and a space between the input surface of the light affecting element and an output surface of the optical waveguide that is inaccessible to the optical waveguide when the optical waveguide is installed in the groove, wherein the waveguide stop is disposed in the space, wherein the at least one groove comprises a Y shaped groove defined by a first region, a second region, an opening, and an a bottom surface, the first region defined between the bottom surface and the second region, the first region comprising opposing outwardly sloping sidewalls being within about 10 degrees of normal to the bottom surface, the second region disposed between the first region and the opening and comprising sidewalls that extend outwardly from a central plane of the Y shaped groove, the Y shaped groove extending along a longitudinal axis between an entrance of the Y shaped groove and a terminal end of the Y shaped groove, the Y shaped groove comprising a longitudinal transition section adjacent the terminal end and an extended section disposed between the entrance and the longitudinal transition section, a spacing between the opposing sidewalls in the extended section being greater than a diameter of the optical waveguide, the transition section comprising centering sidewalls configured to center the optical waveguide within the Y shaped groove. ### Claim 10 (depends on 9) The optical ferrule of claim 9, wherein the waveguide stop comprises a position at which a width between the centering sidewalls is less than a diameter of the waveguide. ### Claim 11 (depends on 9) The optical ferrule of claim 9, wherein the light affecting element comprises a lens, or an element configured to redirect light from the optical waveguide. ### Claim 12 (depends on 9) The optical ferrule of claim 9, wherein the waveguide inaccessible space, when filled with an adhesive, oil or gel is configured to allow light to propagate substantially unimpeded between the output surface of the waveguide and the input surface of the light affecting element. ### Claim 13 (depends on 9) The optical ferrule of claim 9, wherein the waveguide stop is positioned such that a distance between the output surface of the waveguide and the input surface of the light affecting element is greater than about 10 μm. ### Claim 14 (depends on 9) The optical ferrule of claim 9, wherein a distance between the waveguide stop and the input surface of the light affecting element is greater than about 10 μm. ### Claim 15 (depends on 9) The optical ferrule of claim 9, wherein a distance between the waveguide stop and the input surface of the light affecting element is greater than about 40 μm. ### Claim 16 (depends on 9) The optical ferrule of claim 9, wherein a spacing between the centering sidewalls in the transition section decreases along the Y shaped groove toward the input surface of the light affecting element. ### Claim 17 (depends on 9) The optical ferrule of claim 9, wherein a majority of a bottom surface of each groove comprises at least one recessed section. ### Claim 18 (depends on 9) The optical ferrule of claim 9, wherein the waveguide includes a protruding feature that engages with the waveguide stop to restrict motion of the optical waveguide toward the input surface.