Patents by Inventor Ajit Vijay Barve
Ajit Vijay Barve 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).
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Patent number: 12388236Abstract: In some implementations, an emitter array may include a substrate, an epitaxial structure on the substrate, a plurality of bottom-emitting emitters defined in the epitaxial structure, a first electrical contact positioned at a top side of the epitaxial structure, a second electrical contact positioned at the top side of the epitaxial structure, and a metal layer disposed on a bottom side of the substrate. The metal layer may be electrically connected to the second electrical contact. The metal layer may include one or more openings for light emission of the plurality of bottom-emitting emitters.Type: GrantFiled: January 26, 2024Date of Patent: August 12, 2025Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Eric R. Hegblom
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Patent number: 12362541Abstract: A method of incorporating a control structure within a VCSEL device cavity using a multiphase growth sequence includes forming a first mirror over a substrate, forming an active region over the first mirror, forming a spacer on a surface of the active region, forming a control structure on a surface of the spacer, and forming a second mirror over the control structure. The active region and the spacer are formed using a molecular beam epitaxy (MBE) process during an MBE phase of the multiphase growth sequence. The second mirror is formed using a metal-organic chemical vapor deposition (MOCVD) process during an MOCVD phase of the multiphase growth sequence. The control structure is formed using a chemical etching process during a transition period between the MBE phase and the MOCVD phase of the multiphase growth sequence.Type: GrantFiled: June 30, 2021Date of Patent: July 15, 2025Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Matthew Glenn Peters
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Patent number: 12332561Abstract: A wafer may comprise a substrate layer and a plurality of vertical cavity surface emitting lasers (VCSELs) formed on or within the substrate layer. A respective trench-to-trench distance associated with the plurality of VCSELs may vary across the wafer based on a predicted variation of an oxidation rate of an oxidation layer across the wafer.Type: GrantFiled: January 14, 2022Date of Patent: June 17, 2025Assignee: Lumentum Operations LLCInventors: Benjamin Kesler, Ajit Vijay Barve, Guowei Zhao
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Patent number: 12283795Abstract: A closely spaced emitter array may include a first emitter comprising a first plurality of structures and a second emitter, adjacent to the first emitter, comprising a second plurality of structures. The first emitter and the second emitter may be configured in the closely spaced emitter array such that different types of structures between the first plurality of structures and the second plurality of structures do not overlap while maintaining close spacing between the first emitter and the second emitter.Type: GrantFiled: December 5, 2022Date of Patent: April 22, 2025Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Benjamin Kesler, Matthew Glenn Peters
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Patent number: 12003076Abstract: A method for fabricating an array of emitters may include providing a first metallization layer for a first set of emitters of a first channel, wherein the first metallization layer comprises a first interchannel portion positioned between the first set of emitters and a second set of emitters of a second channel. The method may include depositing a dielectric layer on the first interchannel portion of the first metallization layer. The method may include providing a second metallization layer for the second set of emitters, wherein the second metallization layer comprises a second interchannel portion positioned between the first set of emitters and the second set of emitters, and wherein the second interchannel portion of the second metallization layer at least partially overlaps the first interchannel portion of the first metallization layer.Type: GrantFiled: July 29, 2020Date of Patent: June 4, 2024Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Matthew Glenn Peters, Eric R. Hegblom
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Patent number: 11936158Abstract: In some implementations, a vertical-cavity surface-emitting laser (VCSEL) array may comprise a plurality of channels, a plurality of traces, and a plurality of emitters. A channel, of the plurality of channels, may include a set of emitters, of the plurality of emitters, arranged in a row of emitters. The channel may include a trace, of the plurality of traces, that has a trace width that is tapered along a length of the trace. Numerous other aspects are provided.Type: GrantFiled: October 20, 2020Date of Patent: March 19, 2024Assignee: Lumentum Operations LLCInventors: Mohammad Ali Shirazi Hosseini Dokht, Ajit Vijay Barve, Matthew Glenn Peters
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Patent number: 11888293Abstract: In some implementations, an emitter array may include a substrate, an epitaxial structure on the substrate, a plurality of bottom-emitting emitters defined in the epitaxial structure, a first electrical contact positioned at a top side of the epitaxial structure, a second electrical contact positioned at the top side of the epitaxial structure, and a metal layer disposed on a bottom side of the substrate. The metal layer may be electrically connected to the second electrical contact. The metal layer may include one or more openings for light emission of the plurality of bottom-emitting emitters.Type: GrantFiled: December 18, 2020Date of Patent: January 30, 2024Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Eric R. Hegblom
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Patent number: 11831129Abstract: In some implementations, a surface emitting laser may have an emitter design with a short oxidation length and/or a large number of trenches. For example, the surface emitting laser may comprise a metallization layer comprising multiple extended portions extending outwards from a circumference of an inner ring portion, and multiple tabs extending laterally from the multiple extended portions in a partial ring shape. The surface emitting laser may further comprise multiple via openings connecting the metallization layer to a plating metal, where each via opening is positioned over a corresponding tab, of the multiple tabs. The surface emitting laser may comprise multiple oxidation trenches that are each formed in an angular gap between a pair of extended portions, of the multiple extended portions, such that the multiple tabs and the multiple via openings are exclusively outside outer radii of the multiple oxidation trenches.Type: GrantFiled: March 1, 2021Date of Patent: November 28, 2023Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Mohammad Ali Shirazi Hosseini Dokht
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Patent number: 11804695Abstract: In some implementations, an emitter module may include an emitter layer including a first emitter array configured to produce a first beam that provides flood illumination, and a second emitter array configured to produce a second beam that provides spot illumination. The emitter module may include a first optics layer, positioned in front of the emitter layer, that includes a first collimating lens positioned in front of the first emitter array, and a second collimating lens positioned in front of the second emitter array. The emitter module may include a second optics layer, positioned in front of the first optics layer, that includes an optical diffuser positioned in front of the first collimating lens, and a beamsplitter grating positioned in front of the second collimating lens.Type: GrantFiled: December 18, 2020Date of Patent: October 31, 2023Assignee: Lumentum Operations LLCInventors: John Michael Miller, Lijun Zhu, Huanlin Zhu, Benjamin Kesler, Ajit Vijay Barve
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Patent number: 11777280Abstract: An emitter array may comprise a plurality of emitters that includes two adjacent emitters. The emitter array may comprise a plurality of emitters that includes two adjacent emitters. The ohmic metal layer may include a portion that is shared by, and located between, the two adjacent emitters. The emitter array may comprise a protective layer over the ohmic metal layer. The emitter array may comprise a via through the protective layer to the portion. The via is shared by, and located between, the two adjacent emitters.Type: GrantFiled: July 17, 2020Date of Patent: October 3, 2023Assignee: Lumentum Operations LLCInventors: Albert Yuen, Ajit Vijay Barve
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Patent number: 11616343Abstract: A VCSEL may include an n-type substrate layer and an n-type bottom mirror on a surface of the n-type substrate layer. The VCSEL may include an active region on the n-type bottom mirror and a p-type layer on the active region. The VCSEL may include an oxidation layer over the active region to provide optical and electrical confinement of the VCSEL. The VCSEL may include a tunnel junction over the p-type layer to reverse a carrier type of an n-type top mirror. Either the oxidation layer is on or in the p-type layer and the tunnel junction is on the oxidation layer, or the tunnel junction is on the p-type layer and the oxidation layer is on the tunnel junction. The VCSEL may include the n-type top mirror over the tunnel junction, a top contact layer over the n-type top mirror, and a top metal on the top contact layer.Type: GrantFiled: September 30, 2020Date of Patent: March 28, 2023Assignee: Lumentum Operations LLCInventors: Jun Yang, Guowei Zhao, Matthew Glenn Peters, Eric R. Hegblom, Ajit Vijay Barve, Benjamin Kesler
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Patent number: 11522344Abstract: A closely spaced emitter array may include a first emitter comprising a first plurality of structures and a second emitter, adjacent to the first emitter, comprising a second plurality of structures. The first emitter and the second emitter may be configured in the closely spaced emitter array such that different types of structures between the first plurality of structures and the second plurality of structures do not overlap while maintaining close spacing between the first emitter and the second emitter.Type: GrantFiled: November 14, 2019Date of Patent: December 6, 2022Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Benjamin Kesler, Matthew Glenn Peters
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Patent number: 11482839Abstract: A vertical cavity surface emitting laser (VCSEL) array may include a plurality of VCSELs. A size of an emission area of a first VCSEL, of the plurality of VCSELs, may be different from a size of an emission area of a second VCSEL of the plurality of VCSELs. The first VCSEL may be located closer to a center of the VCSEL array than the second VCSEL. A difference between the size of the emission area of the first VCSEL and the size of the emission area of the second VCSEL may be associated with reducing a difference in operating temperature between the first VCSEL and the second VCSEL, or reducing a difference in optical power output between the first VCSEL and the second VCSEL.Type: GrantFiled: March 27, 2019Date of Patent: October 25, 2022Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Eric R. Hegblom
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Patent number: 11437784Abstract: A surface emitting laser may include an isolation layer including a first center portion and a first plurality of outer portions extending from the first center portion, and a metal layer including a second center portion and a second plurality of outer portions extending from the second center portion. The metal layer may be formed on the isolation layer such that a first outer portion, of the second plurality of outer portions, is formed over one of the first plurality of outer portions. The surface emitting laser may include a passivation layer including a plurality of openings. An opening may be formed over the first outer portion. The surface emitting laser may include a plurality of oxidation trenches. An oxidation trench may be positioned at least partially between the first outer portion and a second outer portion of the second plurality of outer portions.Type: GrantFiled: February 21, 2020Date of Patent: September 6, 2022Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Albert Yuen
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Patent number: 11239638Abstract: A wafer may comprise a substrate layer and a plurality of vertical cavity surface emitting lasers (VCSELs) formed on or within the substrate layer. A respective trench-to-trench distance associated with the plurality of VCSELs may vary across the wafer based on a predicted variation of an oxidation rate of an oxidation layer across the wafer.Type: GrantFiled: January 10, 2019Date of Patent: February 1, 2022Assignee: Lumentum Operations LLCInventors: Benjamin Kesler, Ajit Vijay Barve, Guowei Zhao
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Patent number: 11196230Abstract: An emitter array may comprise a plurality of emitters and a metallization layer to electrically connect the plurality of emitters. The metallization layer may have a first end and a second end. The plurality of emitters may include a first emitter and a second emitter. The first emitter may be located closer to the first end than the second emitter. The first emitter and the second emitter have differently sized structures to compensate for a first impedance of the metallization layer between the first end and the first emitter and a second impedance between the first end and the second emitter.Type: GrantFiled: December 12, 2018Date of Patent: December 7, 2021Assignee: Lumentum Operations LLCInventors: Ajit Vijay Barve, Benjamin Kesler, Matthew Glenn Peters
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Patent number: 11088508Abstract: In some implementations, a vertical cavity surface emitting laser (VCSEL) includes a substrate layer and epitaxial layers on the substrate layer. The epitaxial layers may include an active layer, a first mirror, a second mirror, and one or more oxidation layers. The active layer may be between the first mirror and the second mirror, and the one or more oxidation layers may be proximate to the active layer. The one or more oxidation layers may be configured to control beam divergence of a laser beam emitted by the VCSEL based on at least one of: a quantity of the one or more oxidation layers, a shape of the one or more oxidation layers, a thickness of the one or more oxidation layers, or a proximity of the one or more oxidation layers to the active layer.Type: GrantFiled: August 28, 2017Date of Patent: August 10, 2021Assignee: Lumentum Operations LLCInventors: Albert Yuen, Ajit Vijay Barve, Guowei Zhao, Eric R. Hegblom
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Patent number: 10720758Abstract: An emitter array may comprise a plurality of emitters that includes two adjacent emitters. The ohmic metal layer may include a portion that is shared by, and located between, the two adjacent emitters. The emitter array may comprise a protective layer over the ohmic metal layer. The emitter array may comprise a via through the protective layer to the portion. The via is shared by, and located between, the two adjacent emitters.Type: GrantFiled: March 25, 2019Date of Patent: July 21, 2020Assignee: Lumentum Operations LLCInventors: Albert Yuen, Ajit Vijay Barve
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Patent number: 10714903Abstract: In some implementations, a VCSEL array may include a plurality of VCSELs that each operates concurrently and emits light at a same wavelength. A first distance between a first pair of adjacent VCSELs, of the plurality of VCSELs, may be different from a second distance between a second pair of adjacent VCSELs of the plurality of VCSELs. The first pair of adjacent VCSELs may be located closer to a center of the VCSEL array than the second pair of adjacent VCSELs. At least one of temperature non-uniformity or optical power non-uniformity among the plurality of VCSELs may be reduced as compared to another VCSEL array, with a same physical footprint as the VCSEL array, comprising uniformly spaced VCSELs.Type: GrantFiled: June 28, 2019Date of Patent: July 14, 2020Assignee: Lumentum Operations LLCInventors: Albert Yuen, Ajit Vijay Barve
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Publication number: 20200076166Abstract: A wafer may comprise a substrate layer and a plurality of vertical cavity surface emitting lasers (VCSELs) formed on or within the substrate layer. A respective trench-to-trench distance associated with the plurality of VCSELs may vary across the wafer based on a predicted variation of an oxidation rate of an oxidation layer across the wafer.Type: ApplicationFiled: January 10, 2019Publication date: March 5, 2020Inventors: Benjamin Kesler, Ajit Vijay Barve, Guowei Zhao